Wastewater and waste gas integrated treatment device and method for remediation and treatment of cadmium and polycyclic aromatic hydrocarbon combined polluted soil

Abstract

The invention discloses a waste water and waste gas integrated treatment device and method for remediation and treatment of cadmium and polycyclic aromatic hydrocarbon compound contaminated soil, the integrated device is composed of three subsystems, namely a waste gas treatment part, a waste water treatment part, a base and a center control part, and the waste gas treatment part is composed of a waste gas pretreatment unit and a polycyclic aromatic hydrocarbon treatment main unit; the wastewater treatment part consists of a wastewater pretreatment unit, a heavy metal cadmium treatment main unit and a wastewater pH (Potential of Hydrogen) adjusting unit; the base and central control part consists of a left base, a right base and a central control panel with a built-in PLC (Programmable Logic Controller); the device is compact in structure, intelligent control is adopted, and waste heat of waste gas is effectively utilized; the invention relates to a wastewater and waste gas integrated treatment method for remediation and treatment of cadmium and polycyclic aromatic hydrocarbon compound contaminated soil, which overcomes the problem of singleness of the existing treatment method, and can realize integrated treatment of wastewater and waste gas generated by remediation and treatment of cadmium and low-concentration polycyclic aromatic hydrocarbon compound contaminated soil.

Description

Technical Field

[0001] The present invention relates to the field of soil remediation and treatment, and in particular to an integrated wastewater and waste gas treatment device and method for remediation and treatment of soil contaminated by cadmium and polycyclic aromatic hydrocarbons. Background Art

[0002] With the development of China's industry, the problem of soil heavy metal-organic compound pollution, typified by cadmium and polycyclic aromatic hydrocarbons, has become more prominent and has received widespread attention. The pollution impact of soil heavy metal-organic compound pollution on the ecological environment is greater, and remediation and management are more difficult; a single soil remediation technology has limited ability to remediate compound-contaminated soil, and it is often necessary to use soil joint remediation technology to treat multiple pollutants at the same time to overcome the limitations of a single remediation technology and achieve the goal of remediation and management of compound-contaminated soil. The remediation and management of soil with cadmium and polycyclic aromatic hydrocarbons compound pollution can be achieved by using a combined thermal desorption-chemical leaching technology. However, when using the combined thermal desorption-chemical leaching technology for soil remediation and management, the thermal desorption stage will produce polycyclic aromatic hydrocarbons waste gas, and the chemical leaching stage will produce cadmium-containing wastewater. If these wastewaters and waste gases are not treated, they will cause secondary pollution to the environment. The high-concentration PAH waste gas produced by thermal desorption of high-concentration PAH-contaminated soil can enter the combustion system for treatment after condensation and gas-liquid separation; however, for low-concentration PAH-contaminated soil, the PAH waste gas concentration produced after thermal desorption treatment is relatively low (PAH waste gas concentration <10 mg / L), and the combustion system treatment is no longer appropriate, and activated carbon adsorption treatment can be used; the cadmium-containing wastewater produced after soil chemical leaching can be treated by chemical sedimentation.

[0003] At present, the wastewater and waste gas generated in the process of remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons are treated separately, and there is a lack of an integrated treatment device that can simultaneously treat the wastewater and waste gas generated in the process of remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons. In terms of the treatment method of wastewater and waste gas in the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons, due to the limitations of equipment, there is also a lack of corresponding integrated treatment methods. Summary of the invention

[0004] Existing treatment devices cannot simultaneously treat wastewater and waste gas generated by the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons. In response to this situation, the present invention proposes an integrated treatment device for wastewater and waste gas for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons. On this basis, an integrated treatment method for wastewater and waste gas for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons is also proposed. The integrated treatment device can utilize waste gas waste heat, reduce treatment costs, improve treatment efficiency, reduce pollution risks, optimize the working environment, etc. The use of the integrated treatment method can overcome the problem of the singleness of existing treatment methods and realize the integrated treatment of wastewater and waste gas for the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons.

[0005] To solve the above technical problems, the technical solutions adopted by the present invention are as follows: Provide an integrated treatment device for wastewater and waste gas in the remediation of cadmium and polycyclic aromatic hydrocarbon contaminated soil. The device consists of three subsystems that are independent of each other but connected together: an exhaust gas treatment part, a wastewater treatment part, and a base and central control part; The exhaust gas treatment part consists of an exhaust gas pretreatment unit and a main polycyclic aromatic hydrocarbon treatment unit. The wastewater treatment part consists of a wastewater pretreatment unit, a main heavy metal cadmium treatment unit, and a wastewater pH adjustment unit. The base and central control part consists of a left base, a right base, and a central control panel with a built-in PLC controller; The base and central control part is located at the bottom of this integrated treatment device. The left base is on the left, the right base is on the right, and the central control panel with a built-in PLC controller is fixed above the left of the right base. The main polycyclic aromatic hydrocarbon treatment unit, the wastewater pretreatment unit, the exhaust gas pretreatment unit, the main heavy metal cadmium treatment unit, and the wastewater pH adjustment unit are arranged and installed in sequence from left to right in this integrated treatment device. Among them, the main polycyclic aromatic hydrocarbon treatment unit is arranged on the left side of the left base. The main heavy metal cadmium treatment unit is located in the middle of this integrated treatment device, and the bottom of the main heavy metal cadmium treatment unit is supported by the right side of the left base and the left side of the right base. The wastewater pH adjustment unit is arranged on the right side of the right base; The exhaust gas pretreatment unit consists of a soil thermal desorption exhaust gas input port, a condensation pipeline, a temperature control solenoid valve ⅰ, and a temperature control solenoid valve ⅱ. The main polycyclic aromatic hydrocarbon treatment unit consists of pipeline ⅰ, branch pipe ⅰ, induced draft fan a, filter, pipeline ⅱ, polycyclic aromatic hydrocarbon concentration detection equipment, reflux pipeline a, solenoid valve ⅱ, induced draft fan b, reflux pipeline b, solenoid valve ⅰ, outlet pipeline, solenoid valve ⅲ, and gas discharge port. The wastewater pretreatment unit consists of a soil leaching wastewater input port, a wastewater input pipeline, an inlet of the inlet tank, a top plate of the inlet tank, an inlet tank, an overflow partition wall, a high-pressure water backwashing device with a self-pressurizing function, a connecting pipeline, and a sewage discharge port ⅰ with a self-particle concentration detection and sewage discharge valve. The main heavy metal cadmium treatment unit consists of a sedimentation tank, a top plate of the sedimentation tank, a liquid medicine input tank a with a self-liquid medicine control valve, a pH detector a with a self-pH detection probe, a driver and a stirrer, an outlet trough, pipeline ⅲ, heavy metal cadmium concentration detection equipment, reflux pipeline c, solenoid valve ⅴ, a water pump, and a sewage discharge port ⅱ with a self-particle concentration detection and sewage discharge valve. The wastewater pH adjustment unit consists of solenoid valve ⅵ, branch pipe ⅱ, an inlet of the adjustment tank, an adjustment tank, a top plate of the adjustment tank, a liquid medicine input tank b with a self-liquid medicine control valve, an outlet pipeline, solenoid valve ⅳ, a pH detector b with a self-pH detection probe, and an outlet; The pipelines and treatment equipment of the present invention are made of stainless steel on the outside and fiberglass on the inside to ensure that the device can operate stably and safely in a strong corrosive treatment liquid for a long time and maximize its service life;Temperature-controlled solenoid valve i, temperature-controlled solenoid valve ii, induced draft fan a, polycyclic aromatic hydrocarbon concentration detection equipment, solenoid valve i, solenoid valve ii, solenoid valve iii, induced draft fan b, sewage outlet i with built-in particle concentration detection and sewage valve, high-pressure water backwashing equipment with built-in pressurization function, pH detector a with built-in pH detection probe, liquid medicine input box a with built-in liquid medicine control valve, sewage outlet ii with built-in particle concentration detection and sewage valve, heavy metal cadmium concentration detection equipment, solenoid valve v, solenoid valve vi, water pump, pH detector b with built-in pH detection probe, liquid medicine input box b with built-in liquid medicine control valve, solenoid valve iv are all connected to the central control panel of the built-in PLC controller through wires, so as to realize the automatic control of this integrated treatment device; during the early preparation process of this integrated treatment device, a certain amount of clean water needs to be added to the sedimentation tank to ensure the normal operation of the exhaust gas treatment part;

[0006] In the exhaust gas treatment part, the soil thermal desorption exhaust gas inlet is seamlessly welded to the front end of the condensation pipe, the temperature control solenoid valve i is located at the front section of the condensation pipe, behind the starting end and seamlessly connected to the condensation pipe, the end of the condensation pipe is seamlessly connected to the right end of the temperature control solenoid valve ii, the left end of the temperature control solenoid valve ii is seamlessly connected to the right end of the pipe i, the left end of the pipe i is tightly connected to the right end of the branch pipe i, the upper left end of the pipe i is tightly connected to the lower end of the branch pipe ii, the left end of the branch pipe i is tightly connected to the right end of the induced draft fan a, and the left end of the induced draft fan a is tightly connected to the middle and upper part of the right side of the filter. The middle part of the left side of the filter is closely connected to the right end of the pipe ii, the polycyclic aromatic hydrocarbon concentration detection device is arranged on the pipe ii, the left end of the pipe ii is closely connected to the right end of the outlet pipe, the upper part of the left end of the pipe ii is closely connected to the lower end of the return pipe a, the solenoid valve ii is arranged on the return pipe a, the right end of the return pipe a is closely connected to the left end of the induced draft fan b, the right end of the induced draft fan b is closely connected to the left end of the return pipe b, the solenoid valve i is arranged on the return pipe b, the solenoid valve iii is arranged on the outlet pipe, and the left end of the outlet pipe is seamlessly connected to the right end of the gas outlet;

[0007] In the wastewater treatment part, the middle right end of the soil leaching wastewater inlet is tightly connected to the left end of the wastewater inlet pipe, the right end of the wastewater inlet pipe is tightly connected to the left end of the water inlet of the water inlet pool, the water inlet of the water inlet pool is located at the upper left end of the water inlet pool, and the lower end edge of the water inlet of the water inlet pool passes through the top plate of the water inlet pool and is tightly connected to the top plate of the water inlet pool, the right side wall of the water inlet pool is tightly against the upper left wall of the sedimentation barrel and seamlessly welded together, the overflow partition wall is obliquely placed at the upper right section of the water inlet pool, the upper end of the overflow partition wall is tightly welded to the top plate of the water inlet pool, and the lower end of the overflow partition wall is tightly welded to the right side wall of the water inlet pool, the high-pressure water backwashing equipment with its own pressurization function is arranged on the top plate of the right water inlet pool, and the middle of the lower end of the high-pressure water backwashing equipment with its own pressurization function passes through the top plate of the water inlet pool and is tightly connected to the top plate of the water inlet pool The left end of the connecting pipe passes through the top plate of the water inlet tank and is closely connected with the top plate of the water inlet tank, the right end of the connecting pipe passes through the top plate of the settling barrel and is closely connected with the top plate of the settling barrel, the liquid medicine input box a with its own liquid medicine control valve is located on the right side of the connecting pipe and is placed on the top plate of the settling barrel, the lower middle part of the liquid medicine input box a with its own liquid medicine control valve passes through the top plate of the settling barrel and is closely connected with the top plate of the settling barrel, the driver is located above the middle of the top plate of the settling barrel and is closely connected with the top plate of the settling barrel, the upper part of the agitator is closely connected with the driver, the agitator passes through the top plate of the settling barrel and is in the center of the settling barrel, the pH detector a with its own pH detection probe is located on the left side of the driver and is placed on the top plate of the settling barrel, the lower middle part of the pH detector a with its own pH detection probe passes through the top plate of the settling barrel and is closely connected with the settling barrel The top plates of the barrels are closely connected, the water outlet trough is located at the upper right end of the sedimentation barrel, and the upper end of the right wall of the water outlet trough is tightly welded to the top plate of the sedimentation barrel, the left end of pipe ⅲ passes through the right wall of the water outlet trough and is tightly connected to the right wall of the water outlet trough, the heavy metal cadmium concentration detection equipment is arranged on pipe ⅲ, the upper right end of pipe ⅲ is tightly connected to the lower right end of the return pipe c, the right end of pipe ⅲ is tightly connected to the left end of branch pipe ⅱ, the solenoid valve ⅴ is arranged on the middle section of the right side of the return pipe c, the water pump is arranged on the right side of the upper section of the return pipe c, the left end of the return pipe c is located on the left side of the liquid input box a with its own liquid control valve, the lower left end of the return pipe c passes through the top plate of the sedimentation barrel and is tightly connected to the top plate of the sedimentation barrel, the solenoid valve ⅵ is arranged on the right side of the upper section of branch pipe ⅱ, and the lower end of the right section of branch pipe ⅱ is tightly connected to the water inlet of the regulating tank The regulating tank is connected, the water inlet of the regulating tank is located above the right side of the regulating tank, the lower edge of the water inlet of the regulating tank passes through the top plate of the regulating tank and is closely connected with the top plate of the regulating tank, the liquid input box b with its own liquid control valve is placed on the upper left side of the top plate of the regulating tank, the lower middle part of the liquid input box b with its own liquid control valve passes through the top plate of the regulating tank and is closely connected with the top plate of the regulating tank, the left end of the pipeline ⅳ passes through the upper section of the right side wall of the regulating tank, and the left end of the pipeline ⅳ is closely connected with the upper section of the right side wall of the regulating tank, the solenoid valve ⅳ is arranged on the pipeline ⅳ, the pH detector b with its own pH detection probe is located at the right end of the regulating tank and is placed on the top plate of the regulating tank, the lower middle part of the pH detector b with its own pH detection probe passes through the top plate of the regulating tank and is closely connected with the top plate of the regulating tank, and the right end of the pipeline ⅳ is closely connected with the middle of the left end of the water outlet;

[0008] The exhaust gas pretreatment unit consists of a soil thermal desorption exhaust gas input port, a condensation pipeline, a temperature control solenoid valve i, and a temperature control solenoid valve ii. The soil thermal desorption exhaust gas input port is the entrance for the soil thermal desorption exhaust gas to enter the integrated treatment device. The soil thermal desorption exhaust gas input port is seamlessly welded to the starting end of the condensation pipeline. The condensation pipeline is a pipeline with excellent thermal conductivity, good sealing, and no gas leakage. It is tightly wound around the outer wall of the sedimentation barrel clockwise from the left. The temperature control solenoid valve i is located at the front section of the condensation pipeline, behind the starting end, and is seamlessly connected to the condensation pipeline. The temperature control solenoid valve i can sense the gas temperature after the starting end of the condensation pipeline and transmit the real-time sensed temperature to the central control panel of the built-in PLC controller. The condensation The end of the pipeline is seamlessly connected to the right end of the temperature control solenoid valve ii. The temperature control solenoid valve ii can sense the temperature of the gas at the end of the condensation pipeline and transmit the real-time sensed temperature to the central control panel of the built-in PLC controller. When the gas temperature at the end of the condensation pipeline is higher than 40°C, the central control panel of the built-in PLC controller issues a command to close the temperature control solenoid valve ii and the temperature control solenoid valve ii, and the soil thermal desorption waste gas stops inputting. When the gas temperature at the end of the condensation pipeline is 40°C or below, the temperature control solenoid valve ii and the temperature control solenoid valve ii are generally in the open state, and the soil thermal desorption waste gas can be continuously inputted. The main unit for the treatment of polycyclic aromatic hydrocarbons consists of a pipeline ii, a branch pipe ii, an induced draft fan a, a filter, a pipeline ii, and polycyclic aromatic hydrocarbons. The filter is composed of a concentration detection device, a reflux pipe a, a solenoid valve ii, an induced draft fan b, a reflux pipe b, a solenoid valve i, an exhaust pipe, a solenoid valve iii, and a gas outlet. The left end of the pipe i is closely connected to the right end of the branch pipe i, the upper left end of the pipe i is closely connected to the lower end of the branch pipe ii, the left end of the branch pipe i is closely connected to the right end of the induced draft fan a, and the left end of the induced draft fan a is closely connected to the middle and upper right side of the filter. The filter is a polycyclic aromatic hydrocarbon adsorption device with built-in honeycomb activated carbon, and is the core component of the main unit for polycyclic aromatic hydrocarbon treatment. The honeycomb activated carbon inside the filter is densely and neatly arranged and replaceable. An activated carbon replacement plate is provided on the upper end of the filter, and a safety lock is provided on the activated carbon replacement plate. Opening the safety lock can open the activated carbon replacement Replace the plate and open the activated carbon replacement plate to replace the honeycomb activated carbon in the filter. The middle of the left side of the filter is closely connected to the right end of the pipe ⅱ. The polycyclic aromatic hydrocarbon concentration detection device is arranged on the pipe ⅱ. The polycyclic aromatic hydrocarbon concentration detection device has the function of detecting the concentration of polycyclic aromatic hydrocarbons in the gas. The left end of the pipe ⅱ is closely connected to the right end of the outlet pipe. The upper left end of the pipe ⅱ is closely connected to the lower end of the return pipe a. The solenoid valve ⅱ is arranged on the return pipe a. The right end of the return pipe a is closely connected to the left end of the induced draft fan b. The right end of the induced draft fan b is closely connected to the left end of the return pipe b. The solenoid valve i is arranged on the return pipe b. The solenoid valve ⅲ is arranged on the outlet pipe. The left end of the outlet pipe is seamlessly welded to the right end of the gas outlet.

[0009] The wastewater pretreatment unit consists of a soil leaching wastewater inlet, a wastewater inlet pipe, a water inlet of an inlet pool, a water inlet pool top plate, a water inlet pool, a flow partition wall, a high-pressure water backwashing device with a pressurizing function, a connecting pipe, and a sewage outlet i with a particle concentration detection and a sewage valve; the soil leaching wastewater inlet is the entrance for soil leaching wastewater to enter the integrated treatment device, the middle of the right end of the soil leaching wastewater inlet is tightly connected to the left end of the wastewater inlet pipe, the right end of the wastewater input pipe is tightly connected to the left end of the water inlet of the inlet pool, the water inlet of the inlet pool is located at the upper left end of the inlet pool, and the lower end edge of the water inlet of the inlet pool passes through the water inlet pool top plate and is tightly connected to the water inlet pool top plate, the right side wall of the inlet pool is tightly against the upper left side wall of the sedimentation barrel and is seamlessly connected. The flow partition wall is welded together, the flow partition wall is obliquely placed on the upper right section of the water inlet pool, the upper end of the flow partition wall is tightly welded to the top plate of the water inlet pool, the lower end of the flow partition wall is tightly welded to the right side wall of the water inlet pool, and the flow partition wall is provided with a flow hole. The high-pressure water backwashing equipment with its own pressurization function is arranged on the top plate of the right water inlet pool, the lower middle part of the high-pressure water backwashing equipment with its own pressurization function passes through the top plate of the water inlet pool and is tightly connected with the top plate of the water inlet pool, the left end of the connecting pipe passes through the top plate of the water inlet pool and is tightly connected with the top plate of the water inlet pool, the right end of the connecting pipe passes through the top plate of the sedimentation barrel and is tightly connected with the top plate of the sedimentation barrel, the sewage outlet ⅰ of the sewage valve with its own particle concentration detection and sewage outlet ⅰ is arranged at the bottom of the water inlet pool, and the sewage outlet ⅰ of the sewage valve with its own particle concentration detection and sewage outlet ⅰ can be The particle concentration of the settled sludge at the bottom of the water inlet tank is sensed, and the particle concentration of the settled sludge sensed in real time is transmitted to the central control panel of the built-in PLC controller. When the particle concentration of the sludge at the bottom of the water inlet tank reaches a certain limit, the central control panel of the built-in PLC controller issues a command to open the sewage outlet i of the built-in particle concentration detection and sewage valve, and the settled sludge at the bottom of the water inlet tank is effectively discharged through the sewage outlet i of the built-in particle concentration detection and sewage valve; the main unit for heavy metal cadmium treatment consists of a sedimentation barrel, a sedimentation barrel top plate, a liquid input box a with a built-in liquid control valve, a pH detector a with a built-in pH detection probe, a driver and agitator, a water outlet, a pipe iii, a heavy metal cadmium concentration detection device, a reflux pipe c, and a solenoid valve. ⅴ, a water pump, a sewage outlet ⅱ with a built-in particle concentration detector and a sewage valve; the sedimentation barrel itself is supported by the base and the left and right bases in the central control part; the liquid medicine input box a with its own liquid medicine control valve is located on the right side of the connecting pipe and is placed on the top plate of the sedimentation barrel; the lower middle part of the liquid medicine input box a with its own liquid medicine control valve passes through the top plate of the sedimentation barrel and is closely connected with the top plate of the sedimentation barrel; the driver is located above the middle of the top plate of the sedimentation barrel and is closely connected with the top plate of the sedimentation barrel; the upper part of the agitator is closely connected with the driver; the agitator passes through the top plate of the sedimentation barrel and is located in the center of the sedimentation barrel; the driver rotates to drive the agitator to stir; the central control panel with a built-in PLC controller can issue instructions to control the rotation of the driver and the stirring of the agitator.The pH detector a with its own pH detection probe is located on the left side of the driver and is placed on the top plate of the sedimentation barrel. The lower middle part of the pH detector a with its own pH detection probe penetrates the top plate of the sedimentation barrel and is closely connected with the top plate of the sedimentation barrel. The pH detector a with its own pH detection probe can sense the pH value of the liquid in the sedimentation barrel and transmit the real-time pH value monitoring data to the central control panel of the built-in PLC controller. When the pH value of the liquid in the sedimentation barrel is less than the pH lower limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the liquid control valve and continue to add alkali solution until the pH value of the liquid in the sedimentation barrel reaches When the pH value of the liquid in the sedimentation barrel exceeds the pH lower limit warning value, when the pH value of the liquid in the sedimentation barrel is greater than the pH upper limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the built-in liquid control valve and continue to add acid until the pH value of the liquid in the sedimentation barrel is lower than the pH upper limit warning value. When the pH value of the liquid in the sedimentation barrel is greater than and close to the pH lower limit warning value or less than and close to the pH upper limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the built-in liquid control valve and add a corresponding amount of liquid to ensure that the pH value of the liquid in the sedimentation barrel is stable within the range of values ​​suitable for reaction (generally 8 ~9) When the pH value of the liquid in the sedimentation tank is stable within the range of values ​​suitable for reaction (greater than the pH lower limit warning value and less than the pH upper limit warning value), the central control panel of the built-in PLC controller issues a command to close the liquid input box a with its own liquid control valve, the water outlet tank is located at the upper right end of the sedimentation tank, and the upper end of the right side wall of the water outlet tank is tightly welded to the top plate of the sedimentation tank, the left end of the pipe ⅲ passes through the right side wall of the water outlet tank and is tightly connected to the right side wall of the water outlet tank, the heavy metal cadmium concentration detection equipment is set on the pipe ⅲ, the upper right end of the pipe ⅲ is tightly connected to the lower right end of the return pipe c, and the right end of the pipe ⅲ is tightly connected to the left end of the branch pipe ⅱ The two control systems are closely connected, the solenoid valve v is arranged on the middle section of the right side of the return pipe c, the water pump is arranged on the right side of the upper section of the return pipe c, the left end of the return pipe c is located on the left side of the liquid medicine input box a of the built-in liquid medicine control valve, the lower left end of the return pipe c passes through the top plate of the sedimentation barrel and is closely connected with the top plate of the sedimentation barrel, the sewage outlet ⅱ of the built-in particle concentration detection and sewage discharge valve is arranged at the bottom of the sedimentation barrel, the sewage outlet ⅱ of the built-in particle concentration detection and sewage discharge valve can sense the particle concentration of the heavy metal sludge aggregates at the bottom of the sedimentation barrel, and transmit the real-time sensed particle concentration of the heavy metal sludge aggregates to the central control panel of the built-in PLC controller,When the particle concentration of the sludge aggregates at the bottom of the sedimentation tank reaches a certain limit, the central control panel of the built-in PLC controller issues a command to open the sewage outlet ii of the built-in particle concentration detection and sewage valve, and the settled sludge at the bottom of the sedimentation tank is effectively discharged through the sewage outlet ii of the built-in particle concentration detection and sewage valve; the wastewater pH adjustment unit consists of a solenoid valve ⅵ, a branch pipe ⅱ, a water inlet of the regulating tank, a regulating tank, a top plate of the regulating tank, a liquid input box b of the built-in liquid control valve, a water outlet pipe, a solenoid valve ⅳ, and a built-in pH The pH detector b of the detection probe and the water outlet are composed; the solenoid valve ⅵ is arranged on the right side of the upper section of the branch pipe ⅱ, the lower end of the right section of the branch pipe ⅱ is closely connected with the water inlet of the regulating tank, the water inlet of the regulating tank is located above the right side of the regulating tank, the lower edge of the water inlet of the regulating tank passes through the top plate of the regulating tank and is closely connected with the top plate of the regulating tank, the liquid input box b with its own liquid control valve is arranged on the upper left side of the top plate of the regulating tank, the lower middle part of the liquid input box b with its own liquid control valve passes through the top plate of the regulating tank and is closely connected with the top plate of the regulating tank, the pipeline The left end of ⅳ passes through the upper section of the right wall of the regulating tank, and the left end of the pipeline ⅳ is closely connected to the upper section of the right wall of the regulating tank. The solenoid valve ⅳ is set on the pipeline ⅳ. The pH detector b with its own pH detection probe is located at the right end of the regulating tank and is placed on the top plate of the regulating tank. The middle of the lower end of the pH detector b with its own pH detection probe passes through the top plate of the regulating tank and is closely connected to the top plate of the regulating tank. The pH detector b with its own pH detection probe can sense the pH value of the liquid in the regulating tank and transmit the real-time pH value monitoring data to the central control panel of the built-in PLC controller. When the pH value of the liquid in the regulating tank is not neutral, the central control panel of the built-in PLC controller opens the liquid input box b of the built-in liquid control valve and adds an appropriate amount of liquid to adjust the pH value of the liquid in the regulating tank. When the pH value of the liquid in the regulating tank is neutral and the residence time of the liquid in the regulating tank meets the requirements, the central control panel of the built-in PLC controller issues a command to open the solenoid valve ⅳ, and the soil leaching wastewater that meets the standards is discharged from the outlet through the solenoid valve ⅳ and the pipeline ⅳ. ,

[0010] A method for integrated treatment of wastewater and waste gas from soil remediation and treatment of cadmium and polycyclic aromatic hydrocarbons composite contaminated soil, characterized in that: the method overcomes the limitations of existing methods for treating wastewater and waste gas generated by soil remediation and treatment of cadmium and low-concentration polycyclic aromatic hydrocarbons composite contaminated soil, and the method can simultaneously treat wastewater and waste gas generated by soil remediation and treatment of cadmium and low-concentration polycyclic aromatic hydrocarbons composite contaminated soil, and can achieve integrated treatment of wastewater and waste gas generated by soil remediation and treatment of cadmium and low-concentration polycyclic aromatic hydrocarbons composite contaminated soil; A method for integrated treatment of wastewater and waste gas from soil remediation and treatment of cadmium and polycyclic aromatic hydrocarbons composite contaminated soil combines two processes: a thermal desorption waste gas treatment process (consisting of a waste gas pretreatment stage and a polycyclic aromatic hydrocarbons adsorption treatment stage) of soil remediation and treatment of cadmium and low-concentration polycyclic aromatic hydrocarbons composite contaminated soil, and a leaching wastewater treatment process (consisting of a wastewater pretreatment stage, a heavy metal cadmium precipitation treatment stage, and an acid-base adjustment stage);

[0011] Among them, the thermal desorption waste gas treatment process consists of a waste gas pretreatment stage and a polycyclic aromatic hydrocarbon adsorption treatment stage: the first is the waste gas pretreatment stage, in which the waste gas is cooled by heat exchange cooling. In this stage, the waste gas enters the condensation pipe from the soil thermal desorption waste gas input port. The temperature control solenoid valve i can sense the waste gas temperature after the starting end of the condensation pipe and transmit the real-time sensed temperature to the central control panel with a built-in PLC controller. The waste gas dissipates heat through the condensation pipe, exchanges heat with the liquid in the sedimentation barrel and gradually cools down. The temperature control solenoid valve ii can sense the temperature of the waste gas at the end of the condensation pipe and transmit the real-time sensed temperature to the central control panel with a built-in PLC controller. The sensed temperature is transmitted to the central control panel of the built-in PLC controller. When the exhaust gas temperature at the end of the condensation pipe is higher than 40°C, the central control panel of the built-in PLC controller issues a command to close the temperature control solenoid valve i and the temperature control solenoid valve ii, and the exhaust gas stops inputting. When the exhaust gas temperature at the end of the condensation pipe is 40°C or below, the temperature control solenoid valve i and the temperature control solenoid valve ii are in the open state, and the exhaust gas cooled after heat exchange enters the pipe i of the main unit for the treatment of polycyclic aromatic hydrocarbons through the temperature control solenoid valve ii; the second is the polycyclic aromatic hydrocarbons adsorption treatment stage. In this stage, the polycyclic aromatic hydrocarbons in the cooled exhaust gas are fully adsorbed and treated by honeycomb activated carbon. Aromatic hydrocarbons are detected and the treated exhaust gas that meets the standards is discharged. In this stage, the exhaust gas entering the pipe i of the main unit for treating polycyclic aromatic hydrocarbons flows to the branch pipe i and enters the filter from the branch pipe i. The polycyclic aromatic hydrocarbons in the exhaust gas are fully adsorbed by the honeycomb activated carbon in the filter. The exhaust gas after adsorption treatment (hereinafter referred to as exhaust gas) enters the pipe ii from the filter. The polycyclic aromatic hydrocarbons concentration detection equipment installed on the pipe ii will detect the polycyclic aromatic hydrocarbons in the exhaust gas and transmit the real-time data to the central control panel of the built-in PLC controller. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is higher than the monitoring warning value (the emission limit of polycyclic aromatic hydrocarbons in the exhaust gas that meets the standards) When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel of the built-in PLC controller issues a command to close the solenoid valve iii and open the solenoid valve i, the solenoid valve ii and the induced draft fan b at the same time. The exhaust gas that does not meet the standard returns to the pipeline i through the return pipeline a and the return pipeline b in turn and enters the filter through the branch pipe i to repeat the adsorption process until the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel of the built-in PLC controller issues a command to open the solenoid valve iii, and the exhaust gas is able to enter the exhaust pipeline from the pipeline ii and then be discharged through the gas outlet. The thermal desorption exhaust gas treatment process is completed.

[0012] Among them, the leaching wastewater treatment process consists of a wastewater pretreatment stage, a heavy metal cadmium sedimentation treatment stage, and an acid-base adjustment stage: first, the wastewater pretreatment stage, in which particulate matter in the wastewater is removed by gravity self-sedimentation and flow-through partition wall interception. In this stage, the wastewater is input from the soil leaching wastewater inlet and then enters the inlet pool through the wastewater input pipe and the inlet pool in turn. In the inlet pool, the larger particles of the wastewater settle to the bottom of the inlet pool under the action of gravity, and the remaining insoluble impurities in the wastewater are removed when passing through the flow-through partition wall. Interception and filtration: After the water inlet pool equipment has been running for a period of time, the accumulated amount of particulate impurities intercepted by the overflow partition wall will increase. Excessive accumulation will affect the pretreatment volume and treatment effect of the wastewater in the water inlet pool. After the water inlet pool equipment has been running for a period of time, the wastewater will stop entering. The central control panel of the built-in PLC controller will issue a command to start the high-pressure water backwashing equipment with its own pressurization function to release high-pressure water. The high-pressure water will backwash the particulate impurities intercepted by the overflow partition wall into the water inlet pool. After a period of static, the wastewater will start to enter again. The settled sludge at the bottom of the water inlet pool is effectively discharged through the sewage outlet i of the built-in particle concentration detection and sewage valve. The sewage outlet i of the built-in particle concentration detection and sewage valve is set at the bottom of the water inlet pool and can sense the particle concentration of the settled sludge at the bottom of the water inlet pool, and then transmit the real-time sensed particle concentration of the settled sludge to the central control panel of the built-in PLC controller. When the particle concentration of the sludge at the bottom of the water inlet pool reaches a certain limit, the central control panel of the built-in PLC controller will issue a command to open the sewage outlet i of the built-in particle concentration detection and sewage valve The settled sludge discharged from the bottom of the water inlet pool, after being treated by the flow partition wall, enters the sedimentation barrel of the main heavy metal cadmium treatment unit through the connecting pipe; the second is the heavy metal cadmium sedimentation treatment stage, in which the heavy metal cadmium will form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel under the conditions of suitable pH value, stirring and heating, and the heavy metal cadmium in the wastewater can be removed; in this stage, the wastewater entering the sedimentation barrel of the main heavy metal cadmium treatment unit reacts under the conditions of suitable pH value, stirring and heating.The pH detector a with its own pH detection probe monitors the pH value of the wastewater in the sedimentation barrel in real time, and transmits the real-time pH value monitoring data to the central control panel of the built-in PLC controller. When the pH value of the wastewater in the sedimentation barrel is lower than the pH lower limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the built-in liquid control valve to continuously add alkali solution until the pH value of the wastewater in the sedimentation barrel exceeds the pH lower limit warning value. When the pH value of the wastewater in the sedimentation barrel is greater than the pH upper limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the built-in liquid control valve to continuously add acid solution until the pH value of the wastewater in the sedimentation barrel is lower than the pH upper limit warning value. When the pH value of the wastewater in the barrel is greater than and close to the pH lower limit warning value or less than and close to the pH upper limit warning value, the central control panel of the built-in PLC controller issues a command to open the liquid input box a of the built-in liquid control valve to add a corresponding amount of liquid to ensure that the pH value of the wastewater in the sedimentation barrel is stable within the range of values ​​suitable for reaction (generally 8 to 9). When the pH value of the wastewater in the sedimentation barrel is stable within the range of values ​​suitable for reaction (greater than the pH lower limit warning value and less than the pH upper limit warning value), the central control panel of the built-in PLC controller issues a command to close the liquid input box a of the built-in liquid control valve, and the driver rotates to drive the agitator to stir the wastewater, thereby stirring the wastewater and absorbing the waste gas in the condensation pipeline. The heat dissipated can achieve the heating of wastewater. Under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium in the wastewater can quickly form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel. The sludge at the bottom of the sedimentation barrel is effectively discharged through the sewage outlet ⅱ of the built-in particle concentration detection and sewage discharge valve. The sewage outlet ⅱ (1 of the built-in particle concentration detection and sewage discharge valve can sense the concentration of the sludge at the bottom of the sedimentation barrel and transmit the real-time sensed sludge concentration to the central control panel of the built-in PLC controller. When the concentration of the sludge at the bottom of the sedimentation barrel reaches a certain limit, the central control panel of the built-in PLC controller issues a command to open the sewage outlet ⅱ of the built-in particle concentration detection and sewage discharge valve to discharge the sludge at the bottom of the sedimentation barrel. The treated wastewater (hereinafter referred to as intermediate water) enters pipe iii from the outlet tank. The heavy metal cadmium concentration detection equipment installed on pipe iii will detect the heavy metal cadmium in the intermediate water and transmit the real-time data to the central control panel with built-in PLC controller. When the heavy metal cadmium concentration in the intermediate water is higher than the monitoring warning value (the heavy metal cadmium emission limit in the wastewater), the central control panel with built-in PLC controller issues a command to close the solenoid valve ⅵ and open the solenoid valve v and the water pump at the same time. The intermediate water that does not meet the standard (the heavy metal cadmium concentration in the wastewater exceeds the emission limit) returns to the sedimentation tank through the reflux pipe c to repeat the heavy metal cadmium chemical sedimentation process until the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value.When the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value, the central control panel with a built-in PLC controller issues a command to close the solenoid valve ⅴ and the water pump and open the solenoid valve ⅵ at the same time, so that the intermediate water can pass through the solenoid valve ⅵ and enter the branch pipe ⅱ of the wastewater pH adjustment unit; the last stage is the acid-base adjustment stage, in which the pH value of the intermediate water is adjusted to neutral through acid-base adjustment, and the treated wastewater that meets the standards is discharged. In this stage, the intermediate water entering the branch pipe ⅱ of the wastewater pH adjustment unit passes through the branch pipe ⅱ and the water inlet of the adjustment tank in turn and enters the adjustment tank. The pH detector b with its own pH detection probe monitors the pH value of the intermediate water in the adjustment tank in real time. , and transmit the real-time pH value monitoring data to the central control panel of the built-in PLC controller. When the pH value of the intermediate water in the regulating tank is not neutral, the central control panel of the built-in PLC controller opens the liquid input box b of the built-in liquid control valve and adds an appropriate amount of liquid to adjust the pH value of the wastewater in the regulating tank. When the pH value of the intermediate water in the regulating tank is neutral and the residence time of the liquid in the regulating tank meets the requirements, the central control panel of the built-in PLC controller issues a command to open the solenoid valve ⅳ, and the pH value of the wastewater will be adjusted to neutral in the regulating tank. The treated wastewater that meets the standards is discharged from the outlet through the solenoid valve ⅳ and the pipe ⅳ, and the leaching wastewater treatment process is completed. ,

[0013] The beneficial effects of the present invention are:

[0014] The advantages of this integrated device are: (1) it reduces treatment costs and optimizes the working environment; (2) the device has a compact structure, adopts intelligent control, and effectively utilizes waste heat from exhaust gas; (3) compared with other devices, this device has a lower pollution risk and higher treatment efficiency. It is an innovative creation based on the existing device, and improves the integrated treatment of wastewater and exhaust gas generated by the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons.

[0015] The advantages of this integrated method are: it overcomes the problem of the singleness of the existing methods for treating wastewater and waste gas generated by soil remediation and management. This integrated method can achieve integrated treatment of wastewater and waste gas generated by the remediation and management of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0017] Figure 2 A top view of the waste gas pretreatment unit, wastewater pretreatment unit and heavy metal cadmium treatment main unit of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0018] Figure 3 A top view of the flow partition wall of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0019] Figure 4 Cross-sectional view of the flow partition wall of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0020] Figure 5 A filter cross-sectional view of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0021] Figure 6 A top view of the filter of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0022] Figure 7 Schematic diagram of the operation process of an integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons

[0023] Figure 8 Schematic diagram of an integrated wastewater and waste gas treatment method for remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, a wastewater and waste gas integrated treatment device for remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons is provided. The device is composed of three independent but interconnected subsystems, namely, a waste gas treatment part (A), a waste water treatment part (B), and a base and a central control part (C); the waste gas treatment part (A) is composed of a waste gas pretreatment unit (I) and a polycyclic aromatic hydrocarbon treatment main unit (II); the waste water treatment part (B) is composed of a waste water pretreatment unit (III), a heavy metal cadmium treatment main unit (IV), and a waste water pH adjustment unit (V); the base and the central control part (C) are composed of a left base (13a), a right base (13b), and a central control panel (13f) with a built-in PLC controller; the base and the central control part (C) are located at the bottom, left base (13a) and the bottom of the integrated treatment device. ) is on the left, the right base (13b) is on the right, and a central control panel (13f) with a built-in PLC controller is fixed on the upper left of the right base (13b). The polycyclic aromatic hydrocarbons treatment main unit (II), the wastewater pretreatment unit (III), the exhaust gas pretreatment unit (I), the heavy metal cadmium treatment main unit (IV), and the wastewater pH adjustment unit (V) are arranged and installed in sequence from left to right in this integrated treatment device, wherein the polycyclic aromatic hydrocarbons treatment main unit (II) is arranged on the left side of the left base (13a), the heavy metal cadmium treatment main unit (IV) is located in the middle of this integrated treatment device, and the bottom of the heavy metal cadmium treatment main unit (IV) is supported by the right side of the left base (13a) and the left side of the right base (13b), and the wastewater pH adjustment unit (V) is arranged on the right side of the right base (13b);The exhaust gas pretreatment unit (I) is composed of a soil thermal desorption exhaust gas input port (1), a condensation pipeline (2), a temperature control solenoid valve i (3a), and a temperature control solenoid valve ii (3b). The PAH treatment main unit (II) is composed of a pipeline i (4), a branch pipe i (4-1), an induced draft fan a (5), a filter (6), a pipeline ii (7), a PAH concentration detection device (7a), a return pipeline a (7-2), a solenoid valve ii (7c), an induced draft fan b (7d), a return pipeline b (4-2), a solenoid valve i (4a), an exhaust pipeline ( 7-1), solenoid valve ⅲ (7b), and gas outlet (8); the wastewater pretreatment unit (Ⅲ) is composed of a soil leaching wastewater input port (9), a wastewater input pipe (10), a water inlet of the water inlet pool (11a), a water inlet pool top plate (11c), a water inlet pool (11), a flow partition wall (12), a high-pressure water backwashing device with a pressurizing function (11d), a connecting pipe (13g), and a sewage outlet ⅰ (11b) with a particle concentration detection and a sewage valve; the heavy metal cadmium treatment main unit (Ⅳ) is composed of a sedimentation barrel (13), The top plate of the sedimentation tank (13h), a liquid medicine input box a (13e) with a liquid medicine control valve, a pH detector a (16) with a pH detection probe, a driver (15) and an agitator (14), a water outlet (13d), a pipeline ⅲ (17), a heavy metal cadmium concentration detection device (17a), a return pipeline c (17-1), an electromagnetic valve ⅴ (17b), a water pump (17c), and a sewage outlet ⅱ (13c) with a particle concentration detection and sewage valve. The wastewater pH adjustment unit is composed of an electromagnetic valve ⅵ (17d), a branch pipe ii (17-2), a regulating tank water inlet (18a), a regulating tank (18), a regulating tank top plate (18c), a liquid medicine input box b (18b) with a liquid medicine control valve, a water outlet pipe (19), an electromagnetic valve iv (19b), a pH detector b (19a) with a pH detection probe, and a water outlet (20); the pipeline and the treatment equipment of the present invention are made of stainless steel on the outside and glass fiber reinforced plastic on the inner lining to ensure that the device can operate stably and safely in a highly corrosive treatment liquid for a long time, thereby maximizing its service life;Temperature control solenoid valve i (3a), temperature control solenoid valve ii (3b), induced draft fan a (5), polycyclic aromatic hydrocarbon concentration detection equipment (7a), solenoid valve i (4a), solenoid valve ii (7c), solenoid valve iii (7b), induced draft fan b (7d), sewage outlet i (11b) with built-in particle concentration detection and sewage discharge valve, high-pressure water backwashing equipment with built-in pressurization function (11d), pH detector a (16) with built-in pH detection probe, liquid medicine input box a (13e) with built-in liquid medicine control valve, sewage outlet ii (13c) with built-in particle concentration detection and sewage discharge valve, heavy gold The cadmium concentration detection device (17a), the electromagnetic valve v (17b), the electromagnetic valve ⅵ (17d), the water pump (17c), the pH detector b (19a) with a built-in pH detection probe, the liquid medicine input box b (18b) with a built-in liquid medicine control valve, and the electromagnetic valve iv (19b) are all connected to the central control panel (13f) with a built-in PLC controller through wires to realize the automatic control of the integrated treatment device; during the early preparation process of the integrated treatment device, a certain amount of clean water needs to be added to the sedimentation tank (13) to ensure the normal operation of the waste gas treatment part (A);

[0026] In the exhaust gas treatment part (A), the soil thermal desorption exhaust gas input port (1) is seamlessly welded to the front end of the condensation pipe (2), the temperature control solenoid valve i (3a) is located at the front section of the condensation pipe (2), behind the starting end, and is seamlessly connected to the condensation pipe (2), the rear end of the condensation pipe (2) is seamlessly connected to the right end of the temperature control solenoid valve ii (3b), the left end of the temperature control solenoid valve ii (3b) is seamlessly connected to the right end of the pipe i (4), the left end of the pipe i (4) is tightly connected to the right end of the branch pipe i (4-1), the upper left end of the pipe i (4) is tightly connected to the lower end of the branch pipe ii (4-2), the left end of the branch pipe i (4-1) is tightly connected to the right end of the induced draft fan a (5), the left end of the induced draft fan a (5) is tightly connected to the middle and upper right side of the filter (6), and the left side of the filter (6) is tightly connected to the filter (6). The middle part is closely connected to the right end of the pipeline ii (7), the polycyclic aromatic hydrocarbon concentration detection device (7a) is arranged on the pipeline ii (7), the left end of the pipeline ii (7) is closely connected to the right end of the outlet pipeline (7-1), the upper part of the left end of the pipeline ii (7) is closely connected to the lower end of the return pipeline a (7-2), the solenoid valve ii (7c) is arranged on the return pipeline a (7-2), the right end of the return pipeline a (7-2) is closely connected to the left end of the induced draft fan b (7d), the right end of the induced draft fan b (7d) is closely connected to the left end of the return pipeline b (4-2), the solenoid valve i (4a) is arranged on the return pipeline b (4-2), the solenoid valve iii (7b) is arranged on the outlet pipeline (7-1), and the left end of the outlet pipeline (7-1) is seamlessly connected to the right end of the gas outlet (8);

[0027] In the wastewater treatment part (B), the middle of the right end of the soil leaching wastewater input port (9) is tightly connected to the left end of the wastewater input pipe (10), the right end of the wastewater input pipe (10) is tightly connected to the left end of the water inlet (11a) of the water inlet pool, the water inlet (11a) of the water inlet pool is located at the upper left end of the water inlet pool (11), and the lower edge of the water inlet (11a) of the water inlet pool passes through the water inlet pool top plate (11c) and is tightly connected to the water inlet pool top plate (11c), the right side wall of the water inlet pool (11) and the upper left side wall of the sedimentation barrel (13) are tightly abutted and seamlessly welded together, the flow partition wall (12) is obliquely placed at the upper right section of the water inlet pool (11), the upper end of the flow partition wall (12) is tightly welded to the water inlet pool top plate (11c), and the flow partition wall (12) is ) is tightly welded to the right side wall of the water inlet pool (11); a high-pressure water backwashing device (11d) with a self-pressurizing function is arranged on the top plate (11c) of the right water inlet pool; the middle part of the lower end of the high-pressure water backwashing device (11d) with a self-pressurizing function passes through the top plate (11c) of the water inlet pool and is tightly connected to the top plate (11c) of the water inlet pool; the left end of the connecting pipe (13g) passes through the top plate (11c) of the water inlet pool and is tightly connected to the top plate (11c) of the water inlet pool; the right end of the connecting pipe (13g) passes through the top plate (13h) of the sedimentation tank and is tightly connected to the top plate (13h) of the sedimentation tank; a liquid medicine input box a (13e) with a liquid medicine control valve is located on the right side of the connecting pipe (13g) and is arranged on the top plate (13h) of the sedimentation tank; The lower middle part of the liquid medicine input box a (13e) of the liquid medicine control valve passes through the top plate (13h) of the sedimentation barrel and is closely connected with the top plate (13h) of the sedimentation barrel. The driver (15) is located above the middle part of the top plate (13h) of the sedimentation barrel and is closely connected with the top plate (13h) of the sedimentation barrel. The upper part of the agitator (14) is closely connected with the driver (15). The agitator (14) passes through the top plate (13h) of the sedimentation barrel and is located in the center of the sedimentation barrel (13). The pH detector a (16) with a pH detection probe is located on the left side of the driver (15) and is placed on the top plate (13h) of the sedimentation barrel. The lower middle part of the pH detector a (16) with a pH detection probe passes through the top plate (13h) of the sedimentation barrel and is closely connected with the top plate (13h) of the sedimentation barrel. The water outlet trough (13d) is located at the upper right end of the sedimentation barrel (13), and the upper right end of the water outlet trough (13d) is tightly welded to the sedimentation barrel top plate (13h). The left end of the pipe ⅲ (17) passes through the right side wall of the water outlet trough (13d) and is tightly connected to the right side wall of the water outlet trough (13d). The heavy metal cadmium concentration detection device (17a) is arranged on the pipe ⅲ (17). The upper right end of the pipe ⅲ (17) is tightly connected to the lower right end of the return pipe c (17-1), and the right end of the pipe ⅲ (17) is tightly connected to the left end of the branch pipe ⅱ (17-2). The solenoid valve ⅴ (17b) is arranged on the middle section of the right side of the return pipe c (17-1), and the water pump (17c) is arranged on the right side of the upper section of the return pipe c (17-1).The left end of the return pipe c (17-1) is located on the left side of the liquid medicine input box a (13e) with a liquid medicine control valve, the lower left end of the return pipe c (17-1) passes through the top plate (13h) of the sedimentation tank and is closely connected to the top plate (13h) of the sedimentation tank, the solenoid valve ⅵ (17d) is arranged on the right side of the upper section of the branch pipe ⅱ (17-2), the lower end of the right section of the branch pipe ⅱ (17-2) is closely connected to the water inlet (18a) of the regulating tank, the water inlet (18a) of the regulating tank is located above the right side of the regulating tank (18), the lower end edge of the water inlet (18a) of the regulating tank passes through the top plate (18c) of the regulating tank and is closely connected to the top plate (18c) of the regulating tank, the liquid medicine input box b (18b) with a liquid medicine control valve is arranged on the upper left side of the top plate (18c) of the regulating tank, and the liquid medicine control valve is arranged on the upper left side of the top plate (18c) of the regulating tank. The middle part of the lower end of the liquid medicine input box b (18b) of the valve control penetrates the top plate (18c) of the regulating tank and is closely connected with the top plate (18c) of the regulating tank. The left end of the pipeline IV (19) penetrates the upper section of the right wall of the regulating tank (18) and the left end of the pipeline IV (19) is closely connected with the upper section of the right wall of the regulating tank (18). The electromagnetic valve IV (19b) is arranged on the pipeline IV (19). The pH detector b (19a) with a pH detection probe is located at the right end of the regulating tank (18) and is arranged on the top plate (18c) of the regulating tank. The middle part of the lower end of the pH detector b (19a) with a pH detection probe penetrates the top plate (18c) of the regulating tank and is closely connected with the top plate (18c) of the regulating tank. The right end of the pipeline IV (19) is closely connected with the middle part of the left end of the water outlet (20);

[0028] The waste gas pretreatment unit (I) is composed of a soil thermal desorption waste gas input port (1), a condensation pipe (2), a temperature control solenoid valve i (3a), and a temperature control solenoid valve ii (3b); the soil thermal desorption waste gas input port (1) is the entrance for the soil thermal desorption waste gas to enter the integrated treatment device, the soil thermal desorption waste gas input port (1) and the starting end of the condensation pipe (2) are seamlessly welded together, the condensation pipe (2) is a pipe with excellent thermal conductivity, good sealing, and no gas leakage, and is tightly wound around the outer wall of the sedimentation barrel (13) clockwise from the left, the temperature control solenoid valve i (3a) is located at the front section of the condensation pipe (2), after the starting end, and is seamlessly connected to the condensation pipe (2), the temperature control solenoid valve i (3a) can sense the gas temperature after the starting end of the condensation pipe (2) and transmit the real-time sensed temperature to the internal A central control panel (13f) of a PLC controller is installed, the end of the condensation pipe (2) is seamlessly connected to the right end of the temperature control solenoid valve II (3b), the temperature control solenoid valve II (3b) can sense the temperature of the gas at the end of the condensation pipe (2), and transmit the real-time sensed temperature to the central control panel (13f) of the built-in PLC controller, when the gas temperature at the end of the condensation pipe (2) is higher than 40°C, the central control panel (13f) of the built-in PLC controller issues a command to close the temperature control solenoid valve I (3a) and the temperature control solenoid valve II (3b), and the input of soil thermal desorption waste gas is stopped, when the gas temperature at the end of the condensation pipe (2) is 40°C or below, the temperature control solenoid valve I (3a) and the temperature control solenoid valve II (3b) are generally in the open state, and the soil thermal desorption waste gas can be continuously input;

[0029] The main unit (II) for treating polycyclic aromatic hydrocarbons is composed of a pipeline i (4), a branch pipe i (4-1), an induced draft fan a (5), a filter (6), a pipeline ii (7), a polycyclic aromatic hydrocarbon concentration detection device (7a), a return pipeline a (7-2), an electromagnetic valve ii (7c), an induced draft fan b (7d), a return pipeline b (4-2), an electromagnetic valve i (4a), an air outlet pipeline (7-1), an electromagnetic valve iii (7b), and a gas outlet (8); the left end of the pipeline i (4) is tightly connected to the right end of the branch pipe i (4-1); the left end of the pipeline i (4) is connected to the right end of the branch pipe i (4-1); The upper end of the branch pipe (4-1) is closely connected to the lower end of the branch pipe (4-2), the left end of the branch pipe (4-1) is closely connected to the right end of the induced draft fan (5), and the left end of the induced draft fan (5) is closely connected to the middle and upper part of the right side of the filter (6). The filter (6) is a polycyclic aromatic hydrocarbon adsorption device with built-in honeycomb activated carbon and is the core component of the polycyclic aromatic hydrocarbon treatment main unit (II). The honeycomb activated carbon (6b) inside the filter (6) is densely and neatly arranged and replaceable. The upper end of the filter (6) is provided with an activated carbon replacement plate (6a). The activated carbon replacement plate (6a) is provided with a plurality of A safety lock (6c) is provided, and the activated carbon replacement plate (6a) can be opened by opening the safety lock (6c), and the honeycomb activated carbon (6b) in the filter (6) can be replaced by opening the activated carbon replacement plate (6a). The left middle part of the filter (6) is closely connected to the right end of the pipeline ii (7). The polycyclic aromatic hydrocarbon concentration detection device (7a) is provided on the pipeline ii (7). The polycyclic aromatic hydrocarbon concentration detection device (7a) has the function of detecting the concentration of polycyclic aromatic hydrocarbons in the gas. The left end of the pipeline ii (7) is closely connected to the right end of the gas outlet pipeline (7-1). The pipeline ii (7) The upper left end is tightly connected to the lower end of the return pipe a (7-2), the solenoid valve ii (7c) is arranged on the return pipe a (7-2), the right end of the return pipe a (7-2) is tightly connected to the left end of the induced draft fan b (7d), the right end of the induced draft fan b (7d) is tightly connected to the left end of the return pipe b (4-2), the solenoid valve i (4a) is arranged on the return pipe b (4-2), the solenoid valve iii (7b) is arranged on the outlet pipe (7-1), and the left end of the outlet pipe (7-1) is seamlessly welded to the right end of the gas outlet (8);

[0030] The wastewater pretreatment unit (III) is composed of a soil leaching wastewater inlet (9), a wastewater inlet pipeline (10), a water inlet of a water inlet pool (11a), a water inlet pool top plate (11c), a water inlet pool (11), a flow partition wall (12), a high-pressure water backwashing device (11d) with a self-pressurizing function, a connecting pipeline (13g), and a sewage outlet i (11b) with a self-contained particle concentration detection and sewage discharge valve; the soil leaching wastewater inlet (9) is the entrance for soil leaching wastewater to enter the integrated treatment device, the middle of the right end of the soil leaching wastewater inlet (9) is tightly connected to the left end of the wastewater inlet pipeline (10), and the right end of the wastewater inlet pipeline (10) is connected to the inlet. The left end of the water inlet (11a) of the water pool is closely connected, the water inlet (11a) of the water pool is located at the upper left end of the water inlet (11), and the lower end edge of the water inlet (11a) of the water inlet passes through the water inlet top plate (11c) and is closely connected to the water inlet top plate (11c), the right side wall of the water inlet (11) and the upper left side wall of the settling barrel (13) are closely abutted and seamlessly welded together, the flow partition wall (12) is obliquely arranged at the upper right section of the water inlet (11), the upper end of the flow partition wall (12) is closely welded to the water inlet top plate (11c), the lower end of the flow partition wall (12) is closely welded to the right side wall of the water inlet (11), and the flow partition wall (12) A flow hole (12a) is provided on the top of the water inlet tank. A high-pressure water backwashing device (11d) with a self-pressurizing function is arranged on the top plate (11c) of the water inlet tank on the right side. The middle part of the lower end of the high-pressure water backwashing device (11d) with a self-pressurizing function passes through the top plate (11c) of the water inlet tank and is closely connected to the top plate (11c) of the water inlet tank. The left end of the connecting pipe (13g) passes through the top plate (11c) of the water inlet tank and is closely connected to the top plate (11c) of the water inlet tank. The right end of the connecting pipe (13g) passes through the top plate (13h) of the sedimentation tank and is closely connected to the top plate (13h) of the sedimentation tank. A sewage outlet (11b) with a self-contained particle concentration detection and sewage discharge valve is arranged in the water inlet tank. At the bottom of the water inlet tank (11), the sewage outlet i (11b) with a built-in particle concentration detection and sewage discharge valve can sense the particle concentration of the settled sludge at the bottom of the water inlet tank (11), and transmit the real-time sensed particle concentration of the settled sludge to the central control panel (13f) of the built-in PLC controller. When the particle concentration of the sludge at the bottom of the water inlet tank (11) reaches a certain limit, the central control panel (13f) of the built-in PLC controller issues a command to open the sewage outlet i (11b) with the built-in particle concentration detection and sewage discharge valve, and the settled sludge at the bottom of the water inlet tank (11) is effectively discharged through the sewage outlet i (11b) of the built-in particle concentration detection and sewage discharge valve;

[0031] The main unit (IV) for heavy metal cadmium treatment consists of a sedimentation tank (13), a sedimentation tank top plate (13h), a liquid medicine input box a (13e) with a liquid medicine control valve, a pH detector a (16) with a pH detection probe, a driver (15) and an agitator (14), a water outlet tank (13d), a pipeline ⅲ (17), a heavy metal cadmium concentration detection device (17a), a reflux pipeline c (17-1), an electromagnetic valve ⅴ (17b), a water pump ( 17c), a sewage outlet ii (13c) with a particle concentration detector and a sewage discharge valve; the sedimentation barrel (13) itself is supported by the base and the left base (13a) and the right base (13b) in the central control part (C); the liquid medicine input box a (13e) with a liquid medicine control valve is located on the right side of the connecting pipe (13g) and is placed on the top plate (13h) of the sedimentation barrel, and the liquid medicine input box a (13e) with a liquid medicine control valve is located at the lower end of the sedimentation barrel. The driver (15) is located above the middle of the sedimentation barrel top plate (13h) and is in close contact with the sedimentation barrel top plate (13h). The upper part of the agitator (14) is closely connected with the driver (15). The agitator (14) is located in close contact with the driver (15). The agitator (14) is located in the middle of the sedimentation barrel top plate (13h). The driver (15) rotates to drive the agitator (14) to stir. The central control panel (13f) with a built-in PLC controller can issue instructions to control the rotation of the driver (15) and the stirring of the agitator (14). The pH detector a (16) with a built-in pH detection probe is located on the left side of the driver (15) and is placed on the sedimentation barrel top plate (13h). The pH detector a (16) with a built-in pH detection probe penetrates the sedimentation barrel top plate (13h) and is in close contact with the sedimentation barrel top plate (13h).The pH detector a (16) with a built-in pH detection probe can sense the pH value of the liquid in the sedimentation barrel (13) and transmit the real-time pH value monitoring data to the central control panel (13f) with a built-in PLC controller. When the pH value of the liquid in the sedimentation barrel (13) is less than the pH lower limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve to continuously add alkali solution until the pH value of the liquid in the sedimentation barrel (13) exceeds the pH lower limit warning value. When the pH value of the liquid in the sedimentation barrel (13) is greater than the pH upper limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve. 13e) continuously adding acid until the pH value of the liquid in the sedimentation barrel (13) is lower than the pH upper warning value; when the pH value of the liquid in the sedimentation barrel (13) is greater than and close to the pH lower warning value or less than and close to the pH upper warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve to add a corresponding amount of liquid medicine to ensure that the pH value of the liquid in the sedimentation barrel (13) is stable within a range of values ​​suitable for reaction (generally 8 to 9); when the pH value of the liquid in the sedimentation barrel (13) is stable within a range of values ​​suitable for reaction (greater than the pH lower warning value and less than the pH upper warning value), the central control panel (13f) of the built-in PLC controller issues a command The liquid medicine input box a (13e) with a liquid medicine control valve is in a closed state, the water outlet trough (13d) is located at the upper right end of the sedimentation barrel (13), and the upper right end of the water outlet trough (13d) is tightly welded to the sedimentation barrel top plate (13h), the left end of the pipe ⅲ (17) passes through the right side wall of the water outlet trough (13d) and is tightly connected to the right side wall of the water outlet trough (13d), the heavy metal cadmium concentration detection device (17a) is arranged on the pipe ⅲ (17), the upper right end of the pipe ⅲ (17) is tightly connected to the lower right end of the return pipe c (17-1), the right end of the pipe ⅲ (17) is tightly connected to the left end of the branch pipe ⅱ (17-2), the solenoid valve ⅴ (17b) is arranged on the middle section of the right side of the return pipe c (17-1), and the pump is connected to the pump. The water pump (17c) is arranged on the right side of the upper section of the return pipe c (17-1), the left end of the return pipe c (17-1) is located on the left side of the liquid medicine input box a (13e) with a liquid medicine control valve, the lower left end of the return pipe c (17-1) passes through the top plate of the sedimentation barrel (13h) and is closely connected with the top plate of the sedimentation barrel (13h), the sewage outlet ii (13c) with a particle concentration detection and sewage discharge valve is arranged at the bottom of the sedimentation barrel (13), the sewage outlet ii (13c) with a particle concentration detection and sewage discharge valve can sense the particle concentration of the heavy metal sludge aggregates at the bottom of the sedimentation barrel (13), and transmit the real-time sensed particle concentration of the heavy metal sludge aggregates to the central control panel (13f) with a built-in PLC controller,When the particle concentration of the sludge aggregates at the bottom of the sedimentation barrel (13) reaches a certain limit, the central control panel (13f) with a built-in PLC controller issues a command to open the sewage outlet ii (13c) with a built-in particle concentration detection and sewage discharge valve, and the settled sludge at the bottom of the sedimentation barrel (13) is effectively discharged through the sewage outlet ii (13c) with the built-in particle concentration detection and sewage discharge valve;

[0032] The wastewater pH regulating unit comprises an electromagnetic valve ⅵ (17d), a branch pipe ⅱ (17-2), a regulating tank water inlet (18a), a regulating tank (18), a regulating tank top plate (18c), a liquid medicine input box b (18b) with a liquid medicine control valve, a water outlet pipe (19), an electromagnetic valve ⅳ (19b), a pH detector b (19a) with a pH detection probe, and a water outlet (20); the electromagnetic valve ⅵ (17d) is arranged on the right side of the upper section of the branch pipe ⅱ (17-2), the lower end of the right section of the branch pipe ⅱ (17-2) is closely connected to the regulating tank water inlet (18a), and the regulating tank water inlet (18a) is connected to the regulating tank water inlet (18a). ) is located on the upper right side of the regulating tank (18), the lower edge of the regulating tank water inlet (18a) passes through the regulating tank top plate (18c) and is closely connected to the regulating tank top plate (18c), the liquid medicine input box b (18b) with a liquid medicine control valve is arranged on the upper left side of the regulating tank top plate (18c), the lower middle part of the liquid medicine input box b (18b) with a liquid medicine control valve passes through the regulating tank top plate (18c) and is closely connected to the regulating tank top plate (18c), the left end of the pipeline IV (19) passes through the upper section of the right side wall of the regulating tank (18), and the left end of the pipeline IV (19) is closely connected to the upper section of the right side wall of the regulating tank (18). The solenoid valve ⅳ (19b) is arranged on the pipeline ⅳ (19), the pH detector b (19a) with a pH detection probe is located at the right end of the regulating tank (18) and is placed on the top plate (18c) of the regulating tank, the middle part of the lower end of the pH detector b (19a) with a pH detection probe penetrates the top plate (18c) of the regulating tank and is closely connected with the top plate (18c) of the regulating tank, the pH detector b (19a) with a pH detection probe can sense the pH value of the liquid in the regulating tank (18) and transmit the real-time pH value monitoring data to the central control panel (13f) of the built-in PLC controller, when the regulating tank (18) is in a state of being ... When the pH value of the liquid in the regulating pool (18) is not neutral, the central control panel (13f) with a built-in PLC controller opens the liquid input box b (18b) with a built-in liquid control valve and adds an appropriate amount of liquid to adjust the pH value of the liquid in the regulating pool (18); when the pH value of the liquid in the regulating pool (18) is neutral and the residence time of the liquid in the regulating pool (18) meets the requirements, the central control panel (13f) with a built-in PLC controller issues a command to open the electromagnetic valve ⅳ (19b), and the soil leaching wastewater that meets the treatment standards is discharged from the water outlet (20) through the electromagnetic valve ⅳ (19b) and the pipeline ⅳ (19);

[0033] A wastewater and waste gas integrated treatment device for the restoration and treatment of soil contaminated by cadmium and polycyclic aromatic hydrocarbons, the device comprises three subsystems which are independent of each other but connected together, namely a waste gas treatment part (A), a waste water treatment part (B), a base and a central control part (C); the waste gas treatment part (A) comprises two units, namely a waste gas pretreatment unit (I) and a polycyclic aromatic hydrocarbon treatment main unit (II); the waste water treatment part (B) comprises three units, namely a waste water pretreatment unit (III), a heavy metal cadmium treatment main unit (IV) and a waste water pH adjustment unit (V); the base and the central control part (C) comprise a left base (13a), a right base (13b) and a central control panel (13f) with a built-in PLC controller; a temperature control solenoid valve (3), an induced draft valve (13a), a temperature control valve (13b), a temperature control valve (13c), a temperature control valve (13d), a temperature control valve (13e), a temperature control valve (13f ... The machine a (5), the polycyclic aromatic hydrocarbon concentration detection device (7a), the electromagnetic valve i (4a), the electromagnetic valve ii (7c), the electromagnetic valve iii (7b), the induced draft fan b (7d), the pH detector a (16) with a built-in pH detection probe, the liquid medicine input box a (13e) with a built-in liquid medicine control valve, the heavy metal cadmium concentration detection device (17a), the electromagnetic valve v (17b), the electromagnetic valve vi (17d), the water pump (17c), the pH detector b (19a) with a built-in pH detection probe, the liquid medicine input box b (18b) with a built-in liquid medicine control valve, and the electromagnetic valve iv (19b) are all connected to the central control panel (13f) of the built-in PLC controller through wires, so as to realize the automatic control of the integrated processing device;

[0034] The soil thermal desorption waste gas (hereinafter referred to as waste gas) first passes through the waste gas pretreatment unit (I), which is composed of a soil thermal desorption waste gas input port (1), a condensation pipe (2), a temperature control solenoid valve i (3a), and a temperature control solenoid valve ii (3b). The waste gas enters the condensation pipe (2) from the soil thermal desorption waste gas input port (1). The temperature control solenoid valve i (3a) can sense the waste gas temperature after the starting end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) of the built-in PLC controller. The waste gas dissipates heat through the condensation pipe (2) and exchanges heat with the liquid in the sedimentation barrel (13). The temperature control solenoid valve ii (3b) can sense the waste gas temperature after the starting end of the condensation pipe (2). The temperature of the exhaust gas at the end of the condensation pipe (2) is known, and the real-time sensed temperature is transmitted to the central control panel (13f) of the built-in PLC controller. When the exhaust gas temperature at the end of the condensation pipe (2) is higher than 40°C, the central control panel (13f) of the built-in PLC controller issues a command to close the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b), and the exhaust gas input is stopped. When the exhaust gas temperature at the end of the condensation pipe (2) is 40°C or below, the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b) are in an open state, and the exhaust gas cooled after heat exchange enters the pipe i (4) of the main unit (II) for treating polycyclic aromatic hydrocarbons through the temperature control solenoid valve ii (3b);

[0035] Then the waste gas passes through the main unit (II) for treating polycyclic aromatic hydrocarbons, which is composed of pipeline i (4), branch pipe i (4-1), induced draft fan a (5), filter (6), pipeline ii (7), polycyclic aromatic hydrocarbon concentration detection equipment (7a), return pipeline a (7-2), solenoid valve ii (7c), induced draft fan b (7d), return pipeline b (4-2), solenoid valve i (4a), outlet pipeline (7-1), solenoid valve iii (7b), and gas outlet (8). The waste gas passes through The temperature control solenoid valve ii (3b) enters the pipe i (4). At this time, the solenoid valve ii (7c) and the solenoid valve i (4a) are in a closed state, so that the exhaust gas can only flow to the branch pipe i (4-1) after passing through the pipe i (4), and enter the filter (6) from the branch pipe i (4-1). The polycyclic aromatic hydrocarbons in the exhaust gas are fully adsorbed by the honeycomb activated carbon (6b) in the filter (6). The exhaust gas after adsorption treatment (hereinafter referred to as tail gas) enters the pipe ii (7) from the filter (6). The exhaust gas provided on the pipe ii (7) The polycyclic aromatic hydrocarbons concentration detection device (7a) detects the polycyclic aromatic hydrocarbons in the exhaust gas and transmits the real-time data to the central control panel (13f) with a built-in PLC controller. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is higher than the monitoring warning value (the emission limit value of polycyclic aromatic hydrocarbons in the exhaust gas that meets the standard), the central control panel (13f) with a built-in PLC controller issues a command to close the solenoid valve ⅲ (7b) and open the solenoid valve ⅰ (4a) and the solenoid valve ⅱ (7c) and the induced draft fan b (7d) at the same time, and the exhaust gas that does not meet the standard is passed in sequence. The exhaust gas is returned to the pipeline i (4) through the reflux pipeline a (7-2) and the reflux pipeline b (4-2) and enters the filter (6) through the branch pipeline i (4-1) to repeat the adsorption process until the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the solenoid valve iii (7b), so that the exhaust gas can enter the exhaust pipeline (7-1) from the pipeline ii (7) and then be discharged from the gas outlet (8);

[0036] The soil leaching wastewater (hereinafter referred to as wastewater) first reaches the wastewater pretreatment unit (III), which is composed of a soil leaching wastewater input port (9), a wastewater input pipe (10), a water inlet of an inlet pool (11a), a top plate of an inlet pool (11c), an inlet pool (11), a flow partition wall (12), a high-pressure water backwashing device with a pressurizing function (11d), a connecting pipe (13g), and a sewage outlet ⅰ (11b) with a particle concentration detector and a sewage valve. After the wastewater is input from the soil leaching wastewater input port (9), it passes through the wastewater input pipe in sequence. (10) The water inlet (11a) of the water inlet pool enters the water inlet pool (11). In the water inlet pool (11), the larger particles of the wastewater settle to the bottom of the water inlet pool (11) under the action of gravity. The remaining insoluble impurities in the wastewater are intercepted and filtered by the flow partition wall (12). After the wastewater pretreatment unit (III) has been running for a period of time, the accumulated amount of particulate impurities intercepted by the flow partition wall (12) will increase. Excessive accumulation will affect the pretreatment amount and treatment effect of the wastewater in the water inlet pool (11). After the wastewater pretreatment unit (III) has been running for a period of time, the wastewater will stop entering the wastewater. The built-in PLC controller The central control panel (13f) will issue a command to start the high-pressure water backwashing equipment (11d) with a built-in pressurization function to release high-pressure water. The high-pressure water will backwash the particulate impurities intercepted by the flow partition wall (12) into the water inlet pool (11), and then start to enter the wastewater after a period of rest. The settled sludge in the wastewater pretreatment unit (III) is effectively discharged through the sewage outlet i (11b) with a built-in particle concentration detection and sewage outlet valve. The sewage outlet i (11b) with a built-in particle concentration detection and sewage outlet valve is set at the bottom of the water inlet pool (11) and can sense the settled sludge at the bottom of the water inlet pool (11). The particle concentration of the sedimentation sludge is detected in real time and then transmitted to the central control panel (13f) of the built-in PLC controller. When the particle concentration of the sludge at the bottom of the water inlet tank (11) reaches a certain limit, the central control panel (13f) of the built-in PLC controller issues a command to open the sewage outlet ⅰ (11b) with its own particle concentration detection and sewage valve to discharge the sedimentation sludge at the bottom of the water inlet tank (11). The wastewater after preliminary treatment in the water inlet tank (11) enters the sedimentation barrel (13) of the heavy metal cadmium treatment main unit (IV) through the connecting pipe (13g);

[0037] Then the wastewater passes through the main unit (Ⅳ) for heavy metal cadmium treatment. The main unit (Ⅳ) for heavy metal cadmium treatment consists of a sedimentation barrel (13), a sedimentation barrel top plate (13h), a liquid medicine input box a (13e) with a liquid medicine control valve, a pH detector a (16) with a pH detection probe, a driver (15) and an agitator (14), a water outlet (13d), a pipeline ⅲ (17), a heavy metal cadmium concentration detection device (17a), a reflux pipeline c (17-1), an electromagnetic valve ⅴ (17b), a water pump (17c), and a sewage outlet ⅱ (13c) with a particle concentration detection and sewage valve. The wastewater enters the sedimentation barrel (13) through a connecting pipe (13g). The wastewater in the sedimentation barrel (13) is heated under suitable pH, stirring and heating conditions. The reaction is carried out, and a pH detector a (16) with a built-in pH detection probe detects the pH value of the wastewater in the sedimentation barrel (13) in real time, and transmits the real-time pH value monitoring data to a central control panel (13f) with a built-in PLC controller. When the pH value of the wastewater in the sedimentation barrel (13) is less than the pH lower limit warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve to continuously add alkali solution until the pH value of the wastewater in the sedimentation barrel (13) exceeds the pH lower limit warning value. When the pH value of the wastewater in the sedimentation barrel (13) is greater than the pH upper limit warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve. ) continuously add acid until the pH value of the wastewater in the sedimentation barrel (13) is lower than the pH upper warning value; when the pH value of the wastewater in the sedimentation barrel (13) is greater than and close to the pH lower warning value or less than and close to the pH upper warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) of the self-contained liquid medicine control valve to add a corresponding amount of liquid medicine to ensure that the pH value of the wastewater in the sedimentation barrel (13) is stable within a suitable reaction interval (generally 8 to 9); when the pH value of the wastewater in the sedimentation barrel (13) is stable within a suitable reaction interval (greater than the pH lower warning value and less than the pH upper warning value), the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) of the self-contained liquid medicine control valve to add a corresponding amount of liquid medicine to ensure that the pH value of the wastewater in the sedimentation barrel (13) is stable within a suitable reaction interval (greater than the pH lower warning value and less than the pH upper warning value), the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) of the self-contained liquid medicine control valve ... The liquid input box a (13e) is in a closed state, the driver (15) rotates to drive the stirrer (14) to stir the wastewater, and the wastewater is heated by absorbing the heat emitted by the waste gas in the condensation pipe (2). Under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium in the wastewater can quickly form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel (13). The sludge at the bottom of the sedimentation barrel (13) is effectively discharged through the sewage outlet ii (13c) with a particle concentration detection and sewage valve. The sewage outlet ii (13c) with a particle concentration detection and sewage valve can sense the concentration of the sludge at the bottom of the sedimentation barrel (13) and transmit the real-time sensed sludge concentration to the central control panel (13f) with a built-in PLC controller.When the concentration of the sludge at the bottom of the sedimentation barrel (13) reaches a certain limit, the central control panel (13f) of the built-in PLC controller issues a command to open the sewage outlet ⅱ (13c) with its own particle concentration detection and sewage discharge valve to discharge the sludge at the bottom of the sedimentation barrel (13). The treated wastewater (hereinafter referred to as intermediate water) enters the pipeline ⅲ (17) from the outlet tank (13d). The heavy metal cadmium concentration detection device (17a) installed on the pipeline ⅲ (17) will detect the heavy metal cadmium in the intermediate water and transmit the real-time data to the central control panel (13f) of the built-in PLC controller. When the heavy metal cadmium concentration in the intermediate water is higher than the monitoring warning value (the heavy metal cadmium discharge limit in the wastewater), the central control panel of the built-in PLC controller (13f) issues a command to close the electromagnetic valve ⅵ (17d) and simultaneously opens the electromagnetic valve v (17b) and the water pump (17c); the intermediate water that does not meet the standard (the heavy metal cadmium concentration in the wastewater exceeds the standard discharge limit) returns to the sedimentation tank (13) through the reflux pipe c (17-1) to repeat the heavy metal cadmium chemical sedimentation process until the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value. When the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value, the central control panel (13f) with a built-in PLC controller issues a command to close the electromagnetic valve v (17b) and the water pump (17c) and simultaneously opens the electromagnetic valve ⅵ (17d); the intermediate water is able to pass through the electromagnetic valve ⅵ (17d) and enter the branch pipe ⅱ (17-2) in the wastewater pH adjustment unit (V);

[0038] Finally, the wastewater enters the wastewater pH adjustment unit (V), which consists of a solenoid valve VI (17d), a branch pipe II (17-2), a water inlet of the adjustment tank (18a), an adjustment tank (18), a top plate of the adjustment tank (18c), a liquid medicine input box b (18b) with a liquid medicine control valve, a water outlet pipe (19), a solenoid valve IV (19b), a pH detector b (19a) with a pH detection probe, and a water outlet (20). The intermediate water passes through the branch pipe II (17-2) and the water inlet of the adjustment tank (18a) in turn and then enters the adjustment tank (18). The pH detector b (19a) with a pH detection probe monitors the pH value of the intermediate water in the adjustment tank (18) in real time and transmits the real-time pH value monitoring data to the built-in pH detection device. The central control panel (13f) of the LC controller, when the pH value of the intermediate water in the regulating tank (18) is not neutral, the central control panel (13f) of the built-in PLC controller opens the liquid input box b (18b) with a built-in liquid control valve and adds an appropriate amount of liquid to adjust the pH value of the intermediate water in the regulating tank (18); when the pH value of the intermediate water in the regulating tank (18) is neutral and the residence time of the liquid in the regulating tank (18) meets the requirements, the central control panel (13f) of the built-in PLC controller issues a command to open the electromagnetic valve ⅳ (19b), and the pH value of the wastewater is adjusted to neutral in the regulating tank (18), and the wastewater that meets the treatment standard is discharged from the water outlet (20) through the electromagnetic valve ⅳ (19b) and the pipeline ⅳ (19).

[0039] An integrated wastewater and waste gas treatment method for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons combines the thermal desorption waste gas treatment process and the leaching waste water treatment process of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons, thereby realizing the integrated treatment of wastewater and waste gas generated by the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons;

[0040] Among them, the thermal desorption waste gas treatment process consists of the waste gas pretreatment stage and the polycyclic aromatic hydrocarbons adsorption treatment stage:

[0041] The first is the exhaust gas pretreatment stage, in which the exhaust gas is cooled by heat exchange. In this stage, the exhaust gas enters the condensation pipe (2) from the soil thermal desorption exhaust gas input port (1), and the temperature control solenoid valve i (3a) can sense the exhaust gas temperature after the starting end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) with a built-in PLC controller. The exhaust gas dissipates heat through the condensation pipe (2), exchanges heat with the liquid in the sedimentation barrel (13) and gradually cools down. The temperature control solenoid valve ii (3b) can sense the exhaust gas temperature at the end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) with a built-in PLC controller. The temperature is transmitted to the central control panel (13f) of the built-in PLC controller. When the exhaust gas temperature at the end of the condensation pipe (2) is higher than 40°C, the central control panel (13f) of the built-in PLC controller issues a command to close the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b), and the exhaust gas input is stopped. When the exhaust gas temperature at the end of the condensation pipe (2) is 40°C or below, the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b) are in the open state, and the exhaust gas cooled after heat exchange enters the pipe i (4) of the main unit (II) for treating polycyclic aromatic hydrocarbons through the temperature control solenoid valve ii (3b);

[0042] The second is the PAH adsorption treatment stage, in which the PAHs in the cooling exhaust gas are fully adsorbed and treated by honeycomb activated carbon, and the exhaust gas that meets the standards after treatment is discharged; in this stage, the exhaust gas entering the pipe i (4) of the PAH treatment main unit (II) flows to the branch pipe i (4-1), and enters the filter (6) from the branch pipe i (4-1), and the PAHs in the exhaust gas are fully adsorbed by the honeycomb activated carbon (6b) in the filter (6), and the exhaust gas after adsorption treatment (hereinafter referred to as exhaust gas) enters the pipe ii (7) from the filter (6), and the PAH concentration detection device (7a) installed on the pipe ii (7) will detect the PAHs in the exhaust gas and transmit the real-time data to the central control panel (13f) of the built-in PLC controller. When the PAH concentration in the exhaust gas is higher than the monitoring warning value (tail gas), the exhaust gas is detected. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas reaches the emission limit value, the central control panel (13f) of the built-in PLC controller issues a command to close the solenoid valve iii (7b) and simultaneously opens the solenoid valve i (4a), the solenoid valve ii (7c) and the induced draft fan b (7d). The exhaust gas that does not reach the standard returns to the pipe i (4) through the return pipe a (7-2) and the return pipe b (4-2) in turn and enters the filter (6) through the branch pipe i (4-1) to repeat the adsorption process until the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the solenoid valve iii (7b). The exhaust gas is able to enter the exhaust pipe (7-1) from the pipe ii (7) and then be discharged through the gas outlet (8). The thermal desorption exhaust gas treatment process is completed.

[0043] Among them, the leaching wastewater treatment process consists of wastewater pretreatment stage, heavy metal cadmium precipitation treatment stage, and acid-base adjustment stage:

[0044] First, there is the wastewater pretreatment stage, in which the particles in the wastewater are removed by gravity self-sedimentation and the flow partition wall (12). In this stage, the wastewater is input from the soil leaching wastewater input port (9) and then enters the water inlet pool (11) through the wastewater input pipe (10) and the water inlet pool (11a). In the water inlet pool (11), the larger particles in the wastewater settle to the bottom of the water inlet pool (11) under the action of gravity, and the remaining insoluble impurities in the wastewater are removed when passing through the flow partition wall (12). After the inlet pool (11) equipment has been running for a period of time, the amount of particulate impurities intercepted by the overflow partition wall (12) will increase. Excessive accumulation will affect the pretreatment amount and treatment effect of the wastewater in the inlet pool (11). After the inlet pool (11) equipment has been running for a period of time, the wastewater will stop entering, and the central control panel (13f) of the built-in PLC controller will issue a command to start the high-pressure water backwashing equipment (11d) with a built-in pressurization function to release high-pressure water. The high-pressure water will pass through the overflow partition wall (12 ) intercepted particulate impurities are backwashed into the water inlet tank (11), and then wastewater is introduced after a period of rest. The settled sludge at the bottom of the water inlet tank (11) is effectively discharged through the sewage outlet i (11b) with its own particle concentration detection and sewage valve. The sewage outlet i (11b) with its own particle concentration detection and sewage valve is arranged at the bottom of the water inlet tank (11) and can sense the particle concentration of the settled sludge at the bottom of the water inlet tank (11), and then transmit the real-time sensed particle concentration of the settled sludge to the internal A central control panel (13f) with a PLC controller is provided. When the concentration of sludge particles at the bottom of the water inlet pool (11) reaches a certain limit, the central control panel (13f) with a built-in PLC controller issues a command to open the sewage outlet (11b) with a built-in particle concentration detection and sewage valve to discharge the settled sludge at the bottom of the water inlet pool (11). The wastewater treated by the flow partition wall (12) enters the sedimentation barrel (13) of the heavy metal cadmium treatment main unit (IV) through the connecting pipe (13g);

[0045] The second is the heavy metal cadmium sedimentation treatment stage. In this stage, under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium will form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel (13), so that the heavy metal cadmium in the wastewater can be removed. In this stage, the wastewater entering the sedimentation barrel (13) of the heavy metal cadmium treatment main unit (IV) reacts under the conditions of suitable pH value, stirring and heating. The pH detector a (16) with a built-in pH detection probe monitors the pH value of the wastewater in the sedimentation barrel (13) in real time and transmits the real-time pH value monitoring data to the central control panel (13f) with a built-in PLC controller. When the pH value of the wastewater in the sedimentation barrel (13) is less than the pH lower limit warning value, the central control panel (13f) of the built-in PLC controller f) issuing a command to open the liquid input box a (13e) with a liquid control valve to continuously add alkali solution until the pH value of the wastewater in the sedimentation barrel (13) exceeds the pH lower limit warning value; when the pH value of the wastewater in the sedimentation barrel (13) is greater than the pH upper limit warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid input box a (13e) with a liquid control valve to continuously add acid solution until the pH value of the wastewater in the sedimentation barrel (13) is lower than the pH upper limit warning value; when the pH value of the wastewater in the sedimentation barrel (13) is greater than and close to the pH lower limit warning value or less than and close to the pH upper limit warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid input box a (13e) with a liquid control valve to continuously add acid solution. An appropriate amount of liquid medicine is added to ensure that the pH value of the wastewater in the sedimentation tank (13) is stabilized within a suitable reaction interval (generally 8 to 9). When the pH value of the wastewater in the sedimentation tank (13) is stabilized within a suitable reaction interval (greater than the pH lower limit warning value and less than the pH upper limit warning value), the central control panel (13f) of the built-in PLC controller issues a command to close the liquid medicine input box a (13e) with a liquid medicine control valve, and the driver (15) rotates to drive the stirrer (14) to stir the wastewater, thereby heating the wastewater by absorbing the heat emitted by the waste gas in the condensation pipe (2). Under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium in the wastewater can quickly form heavy metal cadmium sludge aggregates and precipitate to the The sludge at the bottom of the sedimentation barrel (13) is effectively discharged through the sewage outlet ii (13c) with its own particle concentration detection and sewage discharge valve. The sewage outlet ii (13c) with its own particle concentration detection and sewage discharge valve can sense the concentration of the sludge at the bottom of the sedimentation barrel (13) and transmit the real-time sensed sludge concentration to the central control panel (13f) with a built-in PLC controller. When the concentration of the sludge at the bottom of the sedimentation barrel (13) reaches a certain limit, the central control panel (13f) with a built-in PLC controller issues a command to open the sewage outlet ii (13c) with its own particle concentration detection and sewage discharge valve to discharge the sludge at the bottom of the sedimentation barrel (13). The treated wastewater (hereinafter referred to as intermediate water) enters the pipe iii (17) from the outlet tank (13d).The heavy metal cadmium concentration detection device (17a) installed on the pipeline ⅲ (17) will detect the heavy metal cadmium in the intermediate water and transmit the real-time data to the central control panel (13f) with a built-in PLC controller. When the heavy metal cadmium concentration in the intermediate water is higher than the monitoring warning value (the heavy metal cadmium discharge limit in the wastewater), the central control panel (13f) with a built-in PLC controller issues an instruction to close the solenoid valve ⅵ (17d) and open the solenoid valve v (17b) and the water pump (17c) at the same time. The intermediate water that does not meet the standard (the heavy metal cadmium concentration in the wastewater exceeds the discharge limit) is discharged. The heavy metal cadmium concentration in the intermediate water (which exceeds the standard discharge limit) is returned to the sedimentation tank (13) through the reflux pipe c (17-1) to repeat the heavy metal cadmium chemical sedimentation process until the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value. When the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value, the central control panel (13f) with a built-in PLC controller issues a command to close the solenoid valve ⅴ (17b) and the water pump (17c) and simultaneously open the solenoid valve ⅵ (17d), so that the intermediate water can pass through the solenoid valve ⅵ (17d) and enter the branch pipe ⅱ (17-2) of the wastewater pH adjustment unit (V);

[0046] The last is the acid-base adjustment stage, in which the pH value of the intermediate water is adjusted to neutral by acid-base adjustment, and the wastewater that meets the standards is discharged after treatment; in this stage, the intermediate water entering the branch pipe ii (17-2) of the wastewater pH adjustment unit (V) passes through the branch pipe ii (17-2) and the regulating tank inlet (18a) in turn and enters the regulating tank (18), and the pH detector b (19a) with a built-in pH detection probe monitors the pH value of the intermediate water in the regulating tank (18) in real time and transmits the real-time pH value monitoring data to the central control panel (13f) with a built-in PLC controller. When the pH value of the intermediate water in the regulating tank (18) is not neutral, When the pH value of the intermediate water in the regulating tank (18) is neutral and the residence time of the liquid in the regulating tank (18) meets the requirements, the central control panel (13f) of the built-in PLC controller issues a command to open the electromagnetic valve ⅳ (19b), and the pH value of the wastewater is adjusted to neutral in the regulating tank (18). The wastewater that meets the treatment standard is discharged from the water outlet (20) through the electromagnetic valve ⅳ (19b) and the pipe ⅳ (19), and the elution wastewater treatment process is completed.

Claims

1. An integrated wastewater and waste gas treatment device for the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons, characterized by: The invention is composed of three independent but interconnected subsystems, namely, a waste gas treatment part (A), a waste water treatment part (B), and a base and a central control part (C); the waste gas treatment part (A) is composed of a waste gas pretreatment unit (I) and a main polycyclic aromatic hydrocarbon treatment unit (II); the waste water treatment part (B) is composed of a waste water pretreatment unit (III), a main heavy metal cadmium treatment unit (IV), and a waste water pH adjustment unit (V); the base and the central control part (C) are composed of a left base (13a), a right base (13b), and a central control panel (13f) with a built-in PLC controller; the waste gas pretreatment unit (I) is composed of a soil thermal desorption waste gas inlet (1), a condensation pipe (2), a temperature control electromagnetic The main unit (II) for treating polycyclic aromatic hydrocarbons is composed of a pipe (4), a branch pipe (4-1), an induced draft fan (5), a filter (6), a pipe (7), a polycyclic aromatic hydrocarbon concentration detection device (7a), a return pipe (7-2), an electromagnetic valve (7c), an induced draft fan (7d), a return pipe (4-2), an electromagnetic valve (4a), an air outlet pipe (7-1), an electromagnetic valve (7b), and a gas outlet (8). The wastewater pretreatment unit (III) is composed of a soil leaching wastewater input port (9), a wastewater input pipe (10), a water inlet of an inlet pool (11a), a top plate of an inlet pool (11c), and a water inlet. The main unit (IV) for heavy metal cadmium treatment is composed of a sedimentation tank (13), a sedimentation tank top plate (13h), a liquid input box a (13e) with a liquid control valve, a pH detector a (16) with a pH detection probe, a driver (15) and an agitator (14), a water outlet tank (13d), a pipeline iii (17), a heavy metal cadmium concentration detection device (17a), a reflux pipeline c (17-1), an electromagnetic valve v (17b), a water pump (17c), The wastewater pH regulating unit is composed of a solenoid valve ⅵ (17d), a branch pipe ⅱ (17-2), a water inlet of a regulating tank (18a), a regulating tank (18), a top plate of the regulating tank (18c), a liquid medicine input box b (18b) with a liquid medicine control valve, a water outlet pipe (19), a solenoid valve ⅳ (19b), a pH detector b (19a) with a pH detection probe, and a water outlet (20); the pipeline and the treatment equipment of the present invention are made of stainless steel on the outside and glass fiber reinforced plastic on the inner lining to ensure that the device can operate stably and safely in a highly corrosive treatment liquid for a long time, thereby maximizing its service life;Temperature control solenoid valve i (3a), temperature control solenoid valve ii (3b), induced draft fan a (5), polycyclic aromatic hydrocarbon concentration detection equipment (7a), solenoid valve i (4a), solenoid valve ii (7c), solenoid valve iii (7b), induced draft fan b (7d), sewage outlet i (11b) with built-in particle concentration detection and sewage discharge valve, high-pressure water backwashing equipment with built-in pressurization function (11d), pH detector a (16) with built-in pH detection probe, liquid medicine input box a (13e) with built-in liquid medicine control valve, sewage outlet ii (13c) with built-in particle concentration detection and sewage discharge valve, heavy gold The cadmium concentration detection device (17a), electromagnetic valve v (17b), electromagnetic valve ⅵ (17d), water pump (17c), pH detector b (19a) with a built-in pH detection probe, liquid medicine input box b (18b) with a built-in liquid medicine control valve, and electromagnetic valve ⅳ (19b) are all connected to the central control panel (13f) of the built-in PLC controller through wires to realize the automatic control of the integrated treatment device; during the preliminary preparation process of the integrated treatment device, a certain amount of clean water needs to be added to the sedimentation tank (13) to ensure the normal operation of the waste gas treatment part (A). ; 2. The integrated wastewater and waste gas treatment device for remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons according to claim 1 is characterized by: The base and the central control part (C) are located at the bottom of the integrated treatment device, the left base (13a) is on the left, the right base (13b) is on the right, and the central control panel (13f) with a built-in PLC controller is fixed on the upper left of the right base (13b). The polycyclic aromatic hydrocarbons treatment main unit (II), the wastewater pretreatment unit (III), the waste gas pretreatment unit (I) and the heavy metal cadmium treatment main unit (IV), and the wastewater pH adjustment unit (V) are arranged and installed in sequence from left to right in the integrated treatment device, wherein the polycyclic aromatic hydrocarbons treatment main unit (II) is placed on the left side of the left base (13a), the heavy metal cadmium treatment main unit (IV) is located in the middle of the integrated treatment device, and the bottom of the heavy metal cadmium treatment main unit (IV) is formed by the left base (13a). The right side of the waste gas treatment part (A) is supported by the left side of the right base (13b), and the waste water pH adjustment unit (V) is arranged on the right side of the right base (13b); in the waste gas treatment part (A), the soil thermal desorption waste gas input port (1) is seamlessly welded to the front end of the condensation pipe (2), the temperature control solenoid valve i (3a) is located at the front section of the condensation pipe (2), after the starting end, and is seamlessly connected to the condensation pipe (2), the rear end of the condensation pipe (2) is seamlessly connected to the right end of the temperature control solenoid valve ii (3b), the left end of the temperature control solenoid valve ii (3b) is seamlessly connected to the right end of the pipe i (4), the left end of the pipe i (4) is tightly connected to the right end of the branch pipe i (4-1), the upper left end of the pipe i (4) is tightly connected to the lower end of the branch pipe ii (4-2), and the branch pipe i (4-1) is connected to the right end of the branch pipe i (4-2). The left end is closely connected to the right end of the induced draft fan a (5), the left end of the induced draft fan a (5) is closely connected to the middle and upper part of the right side of the filter (6), the middle part of the left side of the filter (6) is closely connected to the right end of the pipe ii (7), the polycyclic aromatic hydrocarbon concentration detection device (7a) is arranged on the pipe ii (7), the left end of the pipe ii (7) is closely connected to the right end of the outlet pipe (7-1), the upper left end of the pipe ii (7) is closely connected to the lower end of the return pipe a (7-2), the solenoid valve ii (7c) is arranged on the return pipe a (7-2), the right end of the return pipe a (7-2) is closely connected to the left end of the induced draft fan b (7d), the right end of the induced draft fan b (7d) is closely connected to the left end of the return pipe b (4-2), and the solenoid valve i (4a) is arranged on the return pipe b (4-2), the solenoid valve ⅲ (7b) is arranged on the air outlet pipe (7-1), and the left end of the air outlet pipe (7-1) is seamlessly connected to the right end of the gas outlet (8); in the wastewater treatment part (B), the middle of the right end of the soil washing wastewater input port (9) is tightly connected to the left end of the wastewater input pipe (10), and the right end of the wastewater input pipe (10) is tightly connected to the left end of the water inlet (11a) of the water inlet pool, the water inlet (11a) of the water inlet pool is located at the upper left end of the water inlet pool (11), and the lower end edge of the water inlet (11a) of the water inlet pool passes through the water inlet pool top plate (11c) and is tightly connected to the water inlet pool top plate (11c), the right side wall of the water inlet pool (11) is tightly against the upper left side wall of the sedimentation barrel (13) and is seamlessly welded together,The flow partition wall (12) is obliquely arranged at the upper right section of the water inlet pool (11); the upper end of the flow partition wall (12) is tightly welded to the water inlet pool top plate (11c); the lower end of the flow partition wall (12) is tightly welded to the right side wall of the water inlet pool (11); a high-pressure water backwashing device (11d) with a self-pressurizing function is arranged on the right side water inlet pool top plate (11c); the middle part of the lower end of the high-pressure water backwashing device (11d) with a self-pressurizing function passes through the water inlet pool top plate (11c) and is tightly connected to the water inlet pool top plate (11c); the left end of the connecting pipe (13g) passes through the water inlet pool top plate (11c) and is tightly connected to the water inlet pool top plate (11c); the right end of the connecting pipe (13g) passes through the sedimentation tank top plate (13h) and is tightly connected to the sedimentation tank top plate (13h). The liquid input box a (13e) with its own liquid control valve is located on the right side of the connecting pipe (13g) and is placed on the top plate (13h) of the settling barrel. The lower middle part of the liquid input box a (13e) with its own liquid control valve passes through the top plate (13h) of the settling barrel and is closely connected to the top plate (13h) of the settling barrel. The driver (15) is located above the middle part of the top plate (13h) of the settling barrel and is closely connected to the top plate (13h) of the settling barrel. The upper part of the agitator (14) is closely connected to the driver (15). The agitator (14) passes through the top plate (13h) of the settling barrel and is located in the center of the settling barrel (13). The pH detector a (16) with its own pH detection probe is located on the left side of the driver (15) and is placed on the top plate (13h) of the settling barrel. The pH detector a (16) of the pH detection probe has a lower middle portion that passes through the top plate (13h) of the sedimentation barrel and is tightly connected to the top plate (13h) of the sedimentation barrel. The water outlet trough (13d) is located at the upper right end of the sedimentation barrel (13), and the upper right end of the water outlet trough (13d) is tightly welded to the top plate (13h) of the sedimentation barrel. The left end of the pipe ⅲ (17) passes through the right side wall of the water outlet trough (13d) and is tightly connected to the right side wall of the water outlet trough (13d). The heavy metal cadmium concentration detection device (17a) is arranged on the pipe ⅲ (17). The upper right end of the pipe ⅲ (17) is tightly connected to the lower right end of the return pipe c (17-1), and the right end of the pipe ⅲ (17) is tightly connected to the left end of the branch pipe ⅱ (17-2). The solenoid valve ⅴ (17b) is arranged on the return pipe c The water pump (17c) is arranged on the right side of the upper section of the return pipe c (17-1), the left end of the return pipe c (17-1) is located on the left side of the liquid medicine input box a (13e) with a liquid medicine control valve, the lower left end of the return pipe c (17-1) passes through the top plate (13h) of the sedimentation tank and is closely connected with the top plate (13h) of the sedimentation tank, the electromagnetic valve ⅵ (17d) is arranged on the right side of the upper section of the branch pipe ⅱ (17-2), the lower end of the right section of the branch pipe ⅱ (17-2) is closely connected with the water inlet (18a) of the regulating tank, the water inlet (18a) of the regulating tank is located on the upper right side of the regulating tank (18), the lower end edge of the water inlet (18a) of the regulating tank passes through the top plate (18c) of the regulating tank and is closely connected with the top plate (18c) of the regulating tank,The liquid medicine input box b (18b) with its own liquid medicine control valve is arranged on the upper left side of the top plate (18c) of the regulating tank, the lower middle part of the liquid medicine input box b (18b) with its own liquid medicine control valve passes through the top plate (18c) of the regulating tank and is closely connected with the top plate (18c) of the regulating tank, the left end of the pipeline iv (19) passes through the upper section of the right side wall of the regulating tank (18), and the left end of the pipeline iv (19) is closely connected with the upper section of the right side wall of the regulating tank (18), and the solenoid valve ⅳ (19b) is arranged on the pipeline ⅳ (19), the pH detector b (19a) with its own pH detection probe is located at the right end of the regulating tank (18) and is placed on the top plate (18c) of the regulating tank, the middle part of the lower end of the pH detector b (19a) with its own pH detection probe passes through the top plate (18c) of the regulating tank and is closely connected to the top plate (18c) of the regulating tank, and the right end of the pipeline ⅳ (19) is closely connected to the middle part of the left end of the water outlet (20).

3. According to the wastewater and waste gas integrated treatment device for the remediation and treatment of soil contaminated by cadmium and polycyclic aromatic hydrocarbons as described in claims 1 and 2, it is characterized in that the soil thermal desorption waste gas (hereinafter referred to as waste gas) first passes through the waste gas pretreatment unit (I), and the waste gas enters the condensation pipe (2) from the soil thermal desorption waste gas input port (1), the temperature control solenoid valve i (3a) can sense the waste gas temperature after the starting end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) of the built-in PLC controller, the waste gas dissipates heat through the condensation pipe (2) and exchanges heat with the liquid in the sedimentation barrel (13), the temperature control solenoid valve ii (3b) can sense the temperature of the waste gas at the end of the condensation pipe (2), The real-time sensed temperature is transmitted to the central control panel (13f) of the built-in PLC controller. When the exhaust gas temperature at the end of the condensation pipe (2) is higher than 40°C, the central control panel (13f) of the built-in PLC controller issues a command to close the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b), and the exhaust gas input is stopped. When the exhaust gas temperature at the end of the condensation pipe (2) is 40°C or below, the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b) are in the open state. The exhaust gas cooled after heat exchange passes through the temperature control solenoid valve ii (3b) into the pipe i (4) in the main unit (II) for treating polycyclic aromatic hydrocarbons. At this time, the solenoid valve ii (7c) and the solenoid valve i (4a) are in the closed state. After the exhaust gas passes through the pipe i (4), it can only flow to the branch pipe i (4-1) and enter the filter (6) from the branch pipe i (4-1). The low-concentration polycyclic aromatic hydrocarbons in the exhaust gas are fully adsorbed by the honeycomb activated carbon (6b) in the filter (6). The exhaust gas after adsorption treatment (hereinafter referred to as exhaust gas) enters the pipe ii (7) from the filter (6). The polycyclic aromatic hydrocarbon concentration detection device (7a) installed on the pipe ii (7) will detect the polycyclic aromatic hydrocarbons in the exhaust gas and transmit the real-time data to the central control panel (13f) of the built-in PLC controller. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is higher than the monitoring warning value (the polycyclic aromatic hydrocarbons emission limit value that meets the standard), the central control panel of the built-in PLC controller The board (13f) issues a command to close the solenoid valve iii (7b) and simultaneously opens the solenoid valve i (4a), the solenoid valve ii (7c) and the induced draft fan b (7d). The exhaust gas that does not meet the standards returns to the pipeline i (4) through the return pipeline a (7-2) and the return pipeline b (4-2) in turn and enters the filter (6) through the branch pipe i (4-1) to repeat the adsorption process until the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the solenoid valve iii (7b), and the exhaust gas is able to enter the exhaust pipeline (7-1) from the pipeline ii (7) and then be discharged from the gas outlet (8).

4. The integrated wastewater and waste gas treatment device for remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons according to claims 1, 2 and 3 is characterized by: The soil leaching wastewater (hereinafter referred to as wastewater) first reaches the wastewater pretreatment unit (III). After the wastewater is input from the soil leaching wastewater input port (9), it enters the water inlet pool (11) through the wastewater input pipe (10) and the water inlet pool (11a) in sequence. In the water inlet pool (11), the larger particles of the wastewater settle to the bottom of the water inlet pool (11) under the action of gravity. The remaining insoluble impurities in the wastewater are intercepted and filtered by the flow partition wall (12). After the wastewater pretreatment unit (III) runs for a period of time, the wastewater flows through the flow partition wall (12). The accumulated amount of particulate matter impurities intercepted by the partition wall (12) will increase. Excessive accumulated amount will affect the pretreatment amount and treatment effect of the wastewater in the water inlet pool (11). After the wastewater pretreatment unit (III) runs for a period of time, the wastewater will stop entering. The central control panel (13f) with a built-in PLC controller will issue a command to start the high-pressure water backwashing equipment (11d) with a built-in pressurization function to release high-pressure water. The high-pressure water will backwash the particulate matter impurities intercepted by the overflow partition wall (12) into the water inlet pool (11) and stand still for a period of time. After that, the wastewater begins to enter, and the settled sludge in the wastewater pretreatment unit (III) is effectively discharged through the sewage outlet i (11b) with its own particle concentration detection and sewage valve. The sewage outlet i (11b) with its own particle concentration detection and sewage valve is arranged at the bottom of the water inlet pool (11) and can sense the particle concentration of the settled sludge at the bottom of the water inlet pool (11), and then transmit the real-time sensed particle concentration of the settled sludge to the central control panel (13f) with a built-in PLC controller. When the particle concentration at the bottom of the water inlet pool (11) reaches 0.04, the concentration of the settled sludge is detected. When the concentration of sludge particles reaches a certain limit, the central control panel (13f) with a built-in PLC controller issues a command to open the sewage outlet ⅰ (11b) with its own particle concentration detection and sewage discharge valve to discharge the settled sludge at the bottom of the water inlet pool (11). The wastewater after preliminary treatment in the water inlet pool (11) enters the sedimentation barrel (13) of the heavy metal cadmium treatment main unit (IV) through the connecting pipe (13g). The wastewater in the sedimentation barrel (13) reacts under the conditions of suitable pH value, stirring and heating.A pH detector a (16) with a built-in pH detection probe detects the pH value of the wastewater in the sedimentation barrel (13) in real time and transmits the real-time pH value monitoring data to a central control panel (13f) with a built-in PLC controller. When the pH value of the wastewater in the sedimentation barrel (13) is less than the pH lower limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve to continuously add alkali solution until the pH value of the wastewater in the sedimentation barrel (13) exceeds the pH lower limit warning value. When the pH value of the wastewater in the sedimentation barrel (13) is greater than the pH upper limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine control valve. The liquid medicine input box a (13e) continuously adds acid until the pH value of the wastewater in the sedimentation barrel (13) is lower than the pH upper warning value. When the pH value of the wastewater in the sedimentation barrel (13) is greater than and close to the pH lower warning value or less than and close to the pH upper warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with its own liquid medicine control valve to add a corresponding amount of liquid medicine to ensure that the pH value of the wastewater in the sedimentation barrel (13) is stable in the range of values ​​suitable for reaction (generally 8 to 9). When the pH value of the wastewater in the sedimentation barrel (13) is stable in the range of values ​​suitable for reaction (greater than the pH lower warning value and less than the pH upper warning value), the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with its own liquid medicine control valve to add a corresponding amount of liquid medicine. The control panel (13f) issues a command to close the liquid medicine input box a (13e) of the liquid medicine control valve, and the driver (15) rotates to drive the stirrer (14) to stir the wastewater, thereby stirring the wastewater and heating the wastewater by absorbing the heat emitted by the waste gas in the condensation pipe (2). Under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium in the wastewater can quickly form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel (13). The sludge at the bottom of the sedimentation barrel (13) is effectively discharged by the sewage outlet ii (13c) of the sewage valve with the particle concentration detection and the sewage outlet ii (13c) of the sewage valve with the particle concentration detection and the sewage outlet ii (13c) can sense the concentration of the sludge at the bottom of the sedimentation barrel (13). The central control panel (13f) of the built-in PLC controller will detect the concentration of the sludge in real time and transmit the concentration to the central control panel (13f) of the built-in PLC controller. When the concentration of the sludge at the bottom of the sedimentation barrel (13) reaches a certain limit, the central control panel (13f) of the built-in PLC controller will issue a command to open the sewage outlet ⅱ (13c) with its own particle concentration detection and sewage discharge valve to discharge the sludge at the bottom of the sedimentation barrel (13). The treated wastewater (hereinafter referred to as intermediate water) at this stage enters the pipeline ⅲ (17) from the outlet tank (13d). The heavy metal cadmium concentration detection device (17a) installed on the pipeline ⅲ (17) will detect the heavy metal cadmium in the intermediate water and transmit the real-time data to the central control panel (13f) of the built-in PLC controller.When the heavy metal cadmium concentration in the intermediate water is higher than the monitoring warning value (heavy metal cadmium emission limit), the central control panel (13f) of the built-in PLC controller issues a command to close the solenoid valve ⅵ (17d) and simultaneously open the solenoid valve ⅴ (17b) and the water pump (17c). The intermediate water that does not meet the standard (the heavy metal cadmium concentration exceeds the emission limit) returns to the sedimentation tank (13) through the reflux pipe c (17-1) to repeat the heavy metal cadmium chemical sedimentation process until the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value. When the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value, the central control panel (13f) of the built-in PLC controller issues a command to close the solenoid valve ⅴ (17b) and the water pump (17c) and simultaneously open the solenoid valve ⅵ (17d). The intermediate water enters the wastewater pH adjustment unit (V) through the solenoid valve ⅵ (17d). In the wastewater pH adjustment unit (V), the intermediate water passes through the branch pipe ⅱ (17-2), the regulating tank inlet ( 18a) and then enters the regulating tank (18). The pH detector b (19a) with a built-in pH detection probe monitors the pH value of the intermediate water in the regulating tank (18) in real time and transmits the real-time pH value monitoring data to the central control panel (13f) with a built-in PLC controller. When the pH value of the intermediate water in the regulating tank (18) is not neutral, the central control panel (13f) with a built-in PLC controller opens the liquid input box b (18b) with a built-in liquid control valve and adds an appropriate amount of liquid to adjust the pH value of the intermediate water in the regulating tank (18). When the pH value of the intermediate water in the regulating tank (18) is neutral and the residence time of the liquid in the regulating tank (18) meets the requirements, the central control panel (13f) with a built-in PLC controller issues a command to open the electromagnetic valve ⅳ (19b). The pH value of the wastewater will be adjusted to neutral in the regulating tank (18). The wastewater that meets the treatment standard is discharged from the water outlet (20) through the electromagnetic valve ⅳ (19b) and the pipe ⅳ (19).

5. An integrated treatment method for wastewater and waste gas from the remediation of soil contaminated by cadmium and polycyclic aromatic hydrocarbons, which combines the thermal desorption waste gas treatment process and the leaching wastewater treatment process of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons, and realizes the integrated treatment of wastewater and waste gas generated by the remediation of soil contaminated by cadmium and low-concentration polycyclic aromatic hydrocarbons; wherein, The thermal desorption waste gas treatment process consists of a waste gas pretreatment stage and a polycyclic aromatic hydrocarbon adsorption treatment stage: first, the waste gas pretreatment stage, in which the waste gas is cooled by heat exchange cooling. In this stage, the waste gas enters the condensation pipe (2) from the soil thermal desorption waste gas input port (1), and the temperature control solenoid valve i (3a) can sense the waste gas temperature after the starting end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) of the built-in PLC controller. The waste gas dissipates heat through the condensation pipe (2), exchanges heat with the liquid in the sedimentation barrel (13) and gradually cools down. The temperature control solenoid valve ii (3b) can sense the temperature of the waste gas at the end of the condensation pipe (2) and transmit the real-time sensed temperature to the central control panel (13f) of the built-in PLC controller. The central control panel (13f) includes a built-in PLC controller, which sends a command to close the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b) when the exhaust gas temperature at the end of the condensation pipe (2) is higher than 40°C, and the exhaust gas input stops. When the exhaust gas temperature at the end of the condensation pipe (2) is 40°C or lower, the temperature control solenoid valve i (3a) and the temperature control solenoid valve ii (3b) are in the open state, and the exhaust gas cooled after heat exchange passes through the temperature control solenoid valve ii (3b) into the pipe i (4) of the main polycyclic aromatic hydrocarbon treatment unit (II). The next step is the polycyclic aromatic hydrocarbon adsorption treatment stage, in which the polycyclic aromatic hydrocarbons in the cooled exhaust gas are fully adsorbed and treated by honeycomb activated carbon, and the exhaust gas that meets the standards after treatment is discharged. The exhaust gas entering the pipe i (4) of the main polycyclic aromatic hydrocarbon treatment unit (II) flows to the branch pipe i (4-1), and enters the filter (6) from the branch pipe i (4-1). The polycyclic aromatic hydrocarbons in the exhaust gas are fully adsorbed by the honeycomb activated carbon (6b) in the filter (6). The exhaust gas after adsorption treatment (hereinafter referred to as exhaust gas) enters the pipe ii (7) from the filter (6). The polycyclic aromatic hydrocarbon concentration detection device (7a) installed on the pipe ii (7) will detect the polycyclic aromatic hydrocarbons in the exhaust gas and transmit the real-time data to the central control panel (13f) of the built-in PLC controller. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is higher than the monitoring warning value (the emission limit value of polycyclic aromatic hydrocarbons in the exhaust gas that meets the standard), the central control panel of the built-in PLC controller (13f) issues a command to close the solenoid valve iii (7b) and simultaneously opens the solenoid valve i (4a) and the solenoid valve ii (7c) and the induced draft fan b (7d). The exhaust gas that does not meet the standard returns to the pipe i (4) through the return pipe a (7-2) and the return pipe b (4-2) in turn and enters the filter (6) through the branch pipe i (4-1) to repeat the adsorption process until the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value. When the concentration of polycyclic aromatic hydrocarbons in the exhaust gas is lower than the monitoring warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the solenoid valve iii (7b), and the exhaust gas is able to enter the exhaust pipe (7-1) from the pipe ii (7), and then be discharged through the gas outlet (8). The thermal desorption waste gas treatment process ends. Among them,The leaching wastewater treatment process consists of a wastewater pretreatment stage, a heavy metal cadmium sedimentation treatment stage, and an acid-base adjustment stage. The first stage is the wastewater pretreatment stage. In this stage, the particles in the wastewater are removed by gravity self-sedimentation and the flow partition wall (12). In this stage, the wastewater is input from the soil leaching wastewater input port (9) and then enters the water inlet pool (11) through the wastewater input pipe (10) and the water inlet pool (11a). In the water inlet pool (11), the larger particles in the wastewater settle to the bottom of the water inlet pool (11) under the action of gravity, and the remaining insoluble impurities in the wastewater are intercepted and filtered when passing through the flow partition wall (12). After the water inlet pool (11) equipment has been running for a period of time, the accumulated amount of particulate impurities intercepted by the overflow partition wall (12) will increase. Excessive accumulation will affect the pretreatment amount and treatment effect of the wastewater in the water inlet pool (11). After the water inlet pool (11) equipment has been running for a period of time, the wastewater will stop entering. The central control panel (13f) of the built-in PLC controller will issue a command to start the high-pressure water backwashing equipment (11d) with a built-in pressurization function to release high-pressure water. The high-pressure water will backwash the particulate impurities intercepted by the overflow partition wall (12) into the water inlet pool (11). After a period of rest, the wastewater will start to enter again. The sediment at the bottom of the water inlet pool (11) will The sludge is effectively discharged through the sewage outlet i (11b) with its own particle concentration detection and sewage discharge valve. The sewage outlet i (11b) with its own particle concentration detection and sewage discharge valve is arranged at the bottom of the water inlet pool (11) and can sense the particle concentration of the settled sludge at the bottom of the water inlet pool (11), and then transmit the real-time sensed particle concentration of the settled sludge to the central control panel (13f) of the built-in PLC controller. When the particle concentration of the sludge at the bottom of the water inlet pool (11) reaches a certain limit, the central control panel (13f) of the built-in PLC controller issues a command to open the sewage outlet i (11b) with its own particle concentration detection and sewage discharge valve. 1b) The settled sludge discharged from the bottom of the water inlet pool (11) is discharged, and the wastewater treated by the flow partition wall (12) enters the settling tank (13) of the heavy metal cadmium treatment main unit (IV) through the connecting pipe (13g); the second is the heavy metal cadmium settling treatment stage, in which the heavy metal cadmium is removed from the wastewater by forming heavy metal cadmium sludge aggregates and settling to the bottom of the settling tank (13) under the conditions of suitable pH value, stirring and heating; in this stage, the wastewater entering the settling tank (13) of the heavy metal cadmium treatment main unit (IV) reacts under the conditions of suitable pH value, stirring and heating,A pH detector a (16) with a built-in pH detection probe monitors the pH value of the wastewater in the sedimentation barrel (13) in real time and transmits the real-time pH value monitoring data to a central control panel (13f) with a built-in PLC controller. When the pH value of the wastewater in the sedimentation barrel (13) is less than the pH lower limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine input box a (13e) with a built-in liquid medicine control valve to continuously add alkali solution until the pH value of the wastewater in the sedimentation barrel (13) exceeds the pH lower limit warning value. When the pH value of the wastewater in the sedimentation barrel (13) is greater than the pH upper limit warning value, the central control panel (13f) with a built-in PLC controller issues a command to open the liquid medicine control valve. The liquid medicine input box a (13e) continuously adds acid until the pH value of the wastewater in the sedimentation barrel (13) is lower than the pH upper warning value. When the pH value of the wastewater in the sedimentation barrel (13) is greater than and close to the pH lower warning value or less than and close to the pH upper warning value, the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with its own liquid medicine control valve to add a corresponding amount of liquid medicine to ensure that the pH value of the wastewater in the sedimentation barrel (13) is stable within a suitable reaction interval (generally 8 to 9). When the pH value of the wastewater in the sedimentation barrel (13) is stable within a suitable reaction interval (greater than the pH lower warning value and less than the pH upper warning value), the central control panel (13f) of the built-in PLC controller issues a command to open the liquid medicine input box a (13e) with its own liquid medicine control valve to add a corresponding amount of liquid medicine. The central control panel (13f) issues a command to close the liquid medicine input box a (13e) of the liquid medicine control valve, and the driver (15) rotates to drive the agitator (14) to stir the wastewater, thereby stirring the wastewater and heating the wastewater by absorbing the heat emitted by the waste gas in the condensation pipe (2). Under the conditions of suitable pH value, stirring and heating, the heavy metal cadmium in the wastewater can quickly form heavy metal cadmium sludge aggregates and settle to the bottom of the sedimentation barrel (13). The sludge at the bottom of the sedimentation barrel (13) is effectively discharged by the sewage outlet ii (13c) of the sewage valve with the particle concentration detection and the sewage outlet ii (13c) of the sewage valve with the particle concentration detection and the sewage outlet ii (13c) can sense the sludge at the bottom of the sedimentation barrel (13). The concentration of the sludge is detected in real time and transmitted to the central control panel (13f) of the built-in PLC controller. When the concentration of the sludge at the bottom of the sedimentation barrel (13) reaches a certain limit, the central control panel (13f) of the built-in PLC controller issues a command to open the sewage outlet ⅱ (13c) with its own particle concentration detection and sewage discharge valve to discharge the sludge at the bottom of the sedimentation barrel (13). The treated wastewater (hereinafter referred to as intermediate water) enters the pipeline ⅲ (17) from the outlet tank (13d). The heavy metal cadmium concentration detection device (17a) installed on the pipeline ⅲ (17) will detect the heavy metal cadmium in the intermediate water and transmit the real-time data to the central control panel (13f) of the built-in PLC controller.When the heavy metal cadmium concentration in the intermediate water is higher than the monitoring warning value (the heavy metal cadmium in the wastewater reaches the standard discharge limit), the central control panel (13f) with a built-in PLC controller issues a command to close the solenoid valve ⅵ (17d) and simultaneously open the solenoid valve ⅴ (17b) and the water pump (17c). The intermediate water that does not reach the standard (the heavy metal cadmium concentration in the wastewater exceeds the standard discharge limit) returns to the sedimentation tank (13) through the reflux pipe c (17-1) to repeat the heavy metal cadmium chemical sedimentation process until the heavy metal cadmium concentration in the intermediate water is lower than the monitoring warning value. When the intermediate water When the concentration of heavy metal cadmium is lower than the monitoring warning value, the central control panel (13f) with a built-in PLC controller issues a command to close the solenoid valve ⅴ (17b) and the water pump (17c) and simultaneously open the solenoid valve ⅵ (17d), so that the intermediate water can pass through the solenoid valve ⅵ (17d) and enter the branch pipe ⅱ (17-2) of the wastewater pH adjustment unit (V); the last stage is the acid-base adjustment stage, in which the pH value of the intermediate water is adjusted to neutral through acid-base adjustment, and the treated wastewater that meets the standards is discharged. In this stage, the intermediate water enters the wastewater pH adjustment unit (V). ) of the branch pipe ii (17-2) passes through the branch pipe ii (17-2) and the regulating tank water inlet (18a) in sequence and then enters the regulating tank (18). The pH detector b (19a) with a built-in pH detection probe monitors the pH value of the intermediate water in the regulating tank (18) in real time and transmits the real-time pH value monitoring data to the central control panel (13f) with a built-in PLC controller. When the pH value of the intermediate water in the regulating tank (18) is not neutral, the central control panel (13f) with a built-in PLC controller opens the medicine control valve with a built-in medicine liquid control valve. Liquid is input into the tank b (18b) and an appropriate amount of liquid is added to adjust the pH value of the wastewater in the regulating tank (18). When the pH value of the intermediate water in the regulating tank (18) is neutral and the residence time of the liquid in the regulating tank (18) meets the requirements, the central control panel (13f) of the built-in PLC controller issues a command to open the electromagnetic valve ⅳ (19b). The pH value of the wastewater will be adjusted to neutral in the regulating tank (18). The treated wastewater that meets the standards is discharged from the water outlet (20) through the electromagnetic valve ⅳ (19b) and the pipe ⅳ (19), and the leaching wastewater treatment process is completed.

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