Heavy metal pollution treatment agent, pollutant treatment process and matched treatment device

Abstract

The invention belongs to the technical field of heavy metal pollution treatment, and particularly relates to a heavy metal pollution treatment agent, a pollutant treatment process and a matched treatment device.The treatment agent comprises hydration electron base liquid with the mass concentration being 0.1-5% and the balance water; the PH value of the treating agent is 9-14, and the ORP value of the treating agent is-100 mV to-350 mV. The treating agent is used for treating sewage and soil polluted by heavy metal, heavy metal ions are reduced into metal elementary substances by utilizing the strong reducibility of hydrated electrons, secondary pollution is avoided, the treating efficiency is high, use limitation is avoided, the energy consumption is low, the treating effect is good, and the treating agent has wide application value.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental governance, and in particular to a heavy metal pollution treatment agent, a pollutant treatment process and a matching treatment device. Background Art

[0002] With the acceleration of industrialization, heavy metal pollution has become a global environmental problem. Heavy metals are persistent, bioaccumulative and potentially toxic. They are difficult to treat and costly, and have become a technical problem that needs to be solved urgently in the field of environmental protection. At present, the treatment of heavy metal pollution at home and abroad mainly adopts chemical precipitation, ion exchange, membrane separation and biological treatment.

[0003] Chemical precipitation is the most traditional and widely used heavy metal treatment technology. This method adds precipitants such as hydroxides, sulfides or carbonates to heavy metal wastewater to form insoluble compounds for precipitation and separation. This method has mature technology, simple operation, low equipment investment and relatively low treatment cost, so it has been widely used in industry. However, chemical precipitation also has significant limitations: first, the treatment process will produce a large amount of chemical sludge, which has high treatment costs and is prone to secondary pollution; second, the precipitation of some heavy metal ions is incomplete, especially when treating complexed heavy metals; third, chemical precipitation often requires the addition of a large amount of reagents, which not only increases the treatment cost, but also may introduce new environmental problems.

[0004] Ion exchange technology is another commonly used heavy metal treatment method. Its core is to use special ion exchange resins to selectively adsorb heavy metal ions in water. This method has the advantages of good treatment effect, stable effluent water quality, and recoverable valuable metals. However, ion exchange resins are expensive, the regeneration process is complicated and will produce secondary pollution. At the same time, they are very sensitive to suspended matter in the influent and require strict pretreatment. These factors have greatly limited their promotion and application. Especially when treating complex wastewater containing multiple heavy metals, the treatment effect is often unsatisfactory due to the competitive adsorption between different metal ions.

[0005] In recent years, membrane separation technology has shown good application prospects in the field of heavy metal pollution control. This technology includes different processes such as ultrafiltration, nanofiltration and reverse osmosis, which remove heavy metal ions in water through the selective separation of semipermeable membranes. Membrane separation has the advantages of good separation effect, high effluent quality, resource recovery, etc., and the operation process does not require the addition of drugs and is environmentally friendly. However, the promotion and application of membrane separation technology still faces many challenges: on the one hand, the equipment investment and operating costs are high, and the regular replacement costs of membrane components are high; on the other hand, membrane pollution and scaling problems are serious, which not only affects the treatment effect, but also greatly increases the operation and maintenance costs.

[0006] Biological treatment is an emerging heavy metal pollution control technology that mainly uses the adsorption, enrichment and transformation of heavy metals by microorganisms. This method has low operating costs and is environmentally friendly, and is particularly suitable for treating low-concentration heavy metal pollution. However, biological treatment also has obvious shortcomings: the treatment cycle is long, the effect is unstable, it is easily affected by environmental factors, and it is not suitable for treating high-concentration heavy metal pollution.

[0008] At present, the main technical difficulties faced by the heavy metal pollution control industry can be summarized as follows: First, the existing technology is not ideal for the removal of complexed heavy metals, and the efficiency of coordinated treatment of multiple heavy metals is low; second, traditional treatment methods generally have secondary pollution problems, and pollutants are often transferred rather than transformed; third, the treatment cost remains high, including equipment investment, chemical consumption, energy consumption and other aspects; fourth, the treatment process has poor stability, the system's impact resistance is weak, and it is difficult to cope with fluctuations in influent water quality; fifth, the degree of resource utilization of heavy metals is low, making it difficult to achieve the unity of economic and environmental benefits. Summary of the invention

[0009] The present invention aims to provide an efficient and environmentally friendly heavy metal pollution treatment agent and its supporting method and device. The hydrated electron base liquid described in the heavy metal pollution treatment agent refers to the electromagnetic base liquid invented by patent US 11691906B1. The electromagnetic base liquid confirms the presence of stable hydrated electrons (eaq−). The electromagnetic base liquid has a high pH value, strong reducing property, and is non-corrosive. In the reduction reaction, it can provide a large number of electrons to heavy metal ions, prompting them to be quickly reduced to metal elements and separated from sewage. Therefore, by applying the patented product to the field of heavy metal pollution control, adjusting the redox potential value of heavy metal ions under liquid and solid conditions, reducing the heavy metal potential, and achieving the effect of eliminating or greatly reducing the harm of heavy metal pollution. The treatment agent and treatment method will not cause secondary pollution, and have low cost, short cycle, and significant effect. It is an efficient, economical, and environmentally friendly heavy metal pollution treatment technology.

[0010] A heavy metal pollution treatment agent, the treatment agent includes a hydrated electron base liquid, the mass concentration of which is 0.1-5%, and the balance is water; the treatment agent has a pH value of 9-14 and an ORP value of -100 to -350 mV. The hydrated electron base liquid has extremely strong reducing properties, and can provide electrons to heavy metal ions, so that they are reduced to metal elements or sparingly soluble compounds after receiving electrons, thereby becoming harmless substances. In addition, the treatment agent of the present invention has excellent dispersibility and can be quickly dispersed after mixing with sewage, ensuring that the reduction reaction can be carried out quickly and fully. The aforementioned heavy metals include, but are not limited to, copper, mercury, lead, cadmium, silver, thallium, chromium, copper, and nickel.

[0011] A method for treating heavy metal pollution includes the following steps: 1) detecting the initial pH value and heavy metal content of heavy metal pollutants, and recording the temperature of the pollutants; 2) mixing a treatment agent with heavy metal-containing pollutants; 3) monitoring the pH value, ORP value or heavy metal content of the pollutants, controlling the reaction time, and reducing metal ions to metal elements or insoluble compounds; 4) separating the precipitate to remove the heavy metals in the pollutants. The treatment agent used in the treatment method of the present invention can provide a large number of electrons to neutralize the positive charge of heavy metal ions, thereby reducing metal ions to metal elements or insoluble compounds. Because there is no transfer of pollutants in the entire reaction process, and there is no need to configure different agents for different heavy metals, only monitoring the changes in the pH value, ORP value or heavy metal content of the pollutants can easily observe the state of the reaction, so no secondary pollution will be generated, no high energy consumption is required, the treatment speed is fast, the efficiency is high, and the control process is simplified.

[0012] Specifically, the heavy metal pollutants include wastewater and waste soil.

[0013] Preferably, when the treated pollutant is wastewater, the specific treatment steps are as follows: 1) Pollutant detection: determine the initial pH value, ORP value and heavy metal content of heavy metal pollutants; record the temperature of the pollutants; 2) Mix pollutants and treatment agents: control the mixing ratio of treatment agents to pollutants within the range of 1:10-1:50; carry out mixing reaction within the temperature range of 15-35°C; promote mixing by stirring or ultrasound, with a stirring speed of 60-120r / min; 3) Process monitoring: monitor the pH value and ORP value of the reaction system in real time; when the pH value of the system rises to 5.5-7.5 and the ORP value rises to -30 to -150mV, terminate the reaction; 4) Solid-liquid separation: solid-liquid separation is carried out by precipitation first and then filtration; the precipitation time is not less than 2 hours; determine the heavy metal residue in the upper clear liquid after precipitation, and adjust the pH of the clear liquid to 7; further filter the clear liquid with a filter membrane with a filtration accuracy of ≤0.45μm, and determine the heavy metal residue in the treated water. The principle of this treatment method is: when the wastewater contains a large amount of heavy metals, its pH value is acidic. When the metal ions are gradually reduced to metal elements or insoluble compounds, the ORP value and pH value of the liquid will rise accordingly. When it reaches 5.5-7.5, and the ORP value rises to -30 mv-150mv, it means that the reducing ability of the solution is still in a strong state, but the metal ions have been reduced. At this time, the reaction can be stopped.

[0014] Preferably, when the treated material is waste soil, the mixing method is to first wash and then plow, wash at least once, and after plowing, control the reaction time by monitoring the heavy metal content in the pollutants; The treatment parameters are: soil moisture content: 15-30%, treatment agent dosage: 30-70L / m³ soil, injection point spacing: 1.5-2.5m, reaction time: 7-30 days, soil tillage depth: 30-50cm. The leaching method can be spraying on the soil surface or directly injecting into the soil. Multiple leaching and tilling the soil after leaching are all to increase the contact between the treatment agent and the pollutants so as to better remove the heavy metals in the soil. Because the soil is not easy to detect the pH value and ORP value, the heavy metal content in the soil can be directly detected to determine whether the treatment meets the standards. When the content of each heavy metal in the soil is lower than the value required by environmental protection, it means that the treatment meets the standards.

[0015] Preferably, the elution is performed by surface spraying, which makes it easier for the treatment agent to diffuse in the soil.

[0016] A heavy metal pollution treatment device comprises a treatment agent preparation unit, a metering unit, a reaction unit, a precipitation separation unit, a pH monitoring and adjustment unit and a control unit; the feed end of the reaction unit is respectively connected to the treatment agent preparation unit and the external sewage to be treated, and the volume ratio of the treatment agent and the sewage flowing into the reaction unit is controlled by the metering unit; the discharge end of the reaction unit is connected to the water inlet of the precipitation separation unit; the water outlet of the precipitation separation unit is connected to the water inlet of the pH monitoring and adjustment unit, and a sediment discharge port is provided at the bottom; the water outlet of the pH monitoring and adjustment unit is used to discharge standard treated water, and a detection port is provided on the top of the pH monitoring and adjustment unit for sampling the pH value of the treated wastewater; the control unit is used to monitor the pH value and ORP value of the mixed liquid in the reaction unit.

[0017] Specifically, the metering unit adopts a metering pump; the reaction unit adopts a ceramic stirred reactor or a tubular reactor; and the precipitation and separation unit is a sedimentation tank, a high-efficiency clarifier or a centrifuge.

[0018] Preferably, the control unit further comprises an online heavy metal content monitoring device, and the online heavy metal content monitoring device is used to monitor the heavy metal content of the treated water of the pH monitoring and adjustment unit.

[0019] Preferably, it also includes a treated water reflow pool and a resource processing unit; the treated water reflow pool is used to recycle and store treated water, and its water inlet is provided with a nanofiltration membrane connected to the water outlet of the pH monitoring and adjustment unit; the resource processing unit is used to recover valuable metals, and its feed inlet is connected to the sediment discharge port of the sedimentation separation unit.

[0020] The present invention has the following advantages: 1. High treatment efficiency, excellent removal effect on various heavy metals; 2. Automatic adjustment of pH value, which is conducive to the precipitation of heavy metals and neutralization of wastewater; 3. Carrying out at normal temperature and pressure, low energy consumption; 4. Can treat multiple heavy metals at the same time, simplifying the treatment process; 5. Environmentally friendly, no new pollutants are introduced, and no secondary pollution is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the device of the present invention; Figure 2 Schematic diagram of the treatment method of the present invention (waste soil). DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example 1: The pollutant to be treated is wastewater containing thallium, chromium, copper and nickel, with a temperature of 15°C, an initial pH value of 2.07, thallium 0.57µg / L, chromium 3.48mg / L, copper 166 mg / L, and nickel 32.6 mg / L; the treatment agent used is a hydrated electronic base liquid with a mass concentration of 0.1%, a pH of 9, and an ORP of -100mV.

[0024] like Figure 1 As shown, the treatment device used includes a base liquid preparation tank 1, a reactor 2, a sedimentation tank 3, a PH monitoring and regulating tank 4 and a control unit 11 connected in sequence. The reactor 2 is made of ceramic to prevent reaction with the treatment agent. The control unit 11 includes a PH meter, an ORP meter, an online monitoring device for heavy metal content and a central control console. The signal input end of the PH meter and the ORP meter is arranged in the reactor 2, and the signal output end is connected to the central control console. The central control console monitors the measurement data of the PH meter and the ORP meter in real time during the reaction process. When the set value is reached, the operation of the reactor 2 is stopped. The signal input end of the online monitoring device for heavy metal content is arranged in the PH monitoring and regulating unit, and the signal output section is connected to the central control console to display the heavy metal content in the sewage after treatment. The treatment steps are as follows: The wastewater is transported to reactor 2 via a metering pump; The treating agent in the base liquid preparation tank 1 is injected into the reaction kettle 2 by a metering pump, and the volume ratio of the treating agent to the wastewater is controlled to be 1:10; 15°C, stirring at a speed of 100r / min in reactor 2 to allow the wastewater and the treatment agent to fully contact and mix, while continuously monitoring the pH value and ORP value of the solution through a pH meter and an ORP meter. When the pH value rises to 5.5 and the ORP value rises to -30mv, stop the reaction to obtain a reaction solution; The reaction liquid is transported to the sedimentation tank 3 and allowed to stand for two hours to obtain a supernatant and a lower sediment; The upper clear liquid flows into the pH monitoring and regulating tank 4, and the lower sediment is discharged from the discharge port at the bottom of the sedimentation tank 3; Clear liquid is extracted from the detection port on the top of the pH monitoring and adjusting tank 4 to measure the heavy metal content and pH value therein. Because the sewage may contain other pollutants in addition to heavy metals, even after the heavy metals are removed, the upper clear liquid needs to be further processed before it can be recycled as return water. This step is completed through the pH monitoring and adjusting tank 4.

[0025] The heavy metal content in the treated clear solution was detected as follows: 0.12µg / L for thallium, 0.42mg / L for chromium, 0.04mg / L for copper, and 0.16mg / L for nickel; In the pH monitoring and adjusting tank 4, a small amount of treatment agent can be gradually added and the pH value can be continuously monitored until the pH value of the clear liquid reaches 7.

[0026] 7) The clear liquid with a pH value of 7 is further filtered through a nanofiltration membrane and then flows into a treated water return pool for storage; the test data of the return water filtered through the nanofiltration membrane are as follows: - Thallium (Tl) removal rate: 100% - Chromium (Cr) removal rate: 100% - Copper (Cu) removal rate: 100% - Nickel (Ni) removal rate: 100% The return water can be used for industrial circulation to achieve environmental protection and zero emission requirements.

[0027] 8) The sediment in the sedimentation tank 3 is discharged into the resource recovery processing unit through the sediment discharge port. The resource recovery processing unit adopts a multi-effect evaporation system for subsequent processing and recovery of various valuable metals.

[0028] Example 2: The pollutant to be treated is thallium-containing wastewater, mainly Tl³⁺; its temperature is 25°C, the initial pH value is 2.1, thallium is 0.74 mg / L, and the treatment agent used is a hydrated electronic base liquid with a mass concentration of 2%, its pH is 14, and ORP is -350mV.

[0029] like Figure 1As shown, the treatment device used includes a base liquid preparation tank 1, a reactor 2, a sedimentation tank 3, a pH monitoring and regulating tank 4 and a control unit 11 connected in sequence. The reactor 2 is made of ceramic to prevent reaction with the treatment agent. The control unit 11 includes a pH meter, an ORP meter and a central control console. The signal input ends of the pH meter and the ORP meter are arranged in the reactor 2, and the signal output ends are connected to the central control console. The central control console monitors the measurement data of the pH meter and the ORP meter in real time during the reaction process. When the set value is reached, the operation of the reactor 2 is stopped. The treatment steps are as follows: A) transporting the wastewater to reactor 2 through a metering pump; B) injecting the treatment agent in the base liquid preparation tank 1 into the reaction kettle 2 through a metering pump, and controlling the volume ratio of the treatment agent to the wastewater to be 1:30; C) The treatment agent and wastewater were stirred at 80 rpm in reactor 2 at 25°C. The treatment process of thallium wastewater generally includes three stages. In the first stage, the treatment agent promotes the reduction of Tl³⁺ to Tl⁺. In the second stage, the treatment agent promotes the reduction of Tl⁺ to Tl 0 The reaction mechanism of the third stage is nTl 0 → (Tl)n, metallic thallium particles gradually aggregate to form larger particles, which is conducive to subsequent precipitation and separation. Because the treatment agent at this concentration has a good dispersion effect, the reaction process is very fast, and a pH meter and ORP meter are required to continuously monitor the pH and ORP values ​​of the solution; when the pH value rises to 7 and the ORP value rises to -150, the reaction is stopped; D) The reaction solution was transported to a sedimentation tank and allowed to stand for 3 hours; E) The upper clear liquid flows into the pH monitoring and regulating tank 4, and the lower sediment is discharged from the discharge port at the bottom of the sedimentation tank 3; F) Extract clear liquid from the detection port at the top of the pH monitoring and adjustment tank 4 to measure the thallium content, pH value and ORP value.

[0030] Measurement results: Thallium 1.37μg / L, pH 7, ORP, -150mV; Since the pH value has reached 7, there is no need to adjust the pH value, but thallium is not completely removed. A 0.45μm nanofiltration membrane is used for further filtration. After filtration, the thallium (Tl) removal rate is 100%; the nanofiltration membrane can be used at normal pressure, consumes less energy, and can remove all thallium. Compared with the existing treatment methods, the existing methods generally use RO membrane or nanofiltration membrane for filtration first, which can only filter about 40% of heavy metal pollutants. The remaining sewage needs to be further treated by evaporation. The whole process is inefficient and costly, which is not conducive to popularization and promotion. The present invention first separates most of the heavy metal pollutants through the treatment agent, and then filters the remaining pollutants through the nanofiltration membrane. It not only has excellent effect, but also has extremely low cost, fast processing speed, and no secondary pollution.

[0031] Precautions 1. Due to the high toxicity of heavy metals such as thallium, all handling operations should be carried out in a well-ventilated environment, and operators must wear protective equipment such as masks, gloves and goggles to ensure safety.

[0032] 2. Changes in pH during the reaction may affect the form of thallium and require close monitoring.

[0033] 3. The treated sediment should be properly disposed of as hazardous waste.

[0034] 4. The treated water still needs to undergo a final thallium content test to ensure that it meets the standards before it can be discharged.

[0035] Example 3: The pollutant to be treated is copper-containing wastewater, the temperature of which is 35°C, the initial pH value is 2.1, and the copper content is 243 mg / L; the treatment agent used is a hydrated electronic base liquid with a mass concentration of 3%, a pH value of 14, and an ORP of -350 mV.

[0036] like Figure 1 As shown, the treatment device used includes a base liquid preparation tank 1, a reactor 2, a sedimentation tank 3, a pH monitoring and regulating tank 4 and a control unit 11 connected in sequence. The reactor 2 is made of ceramic to prevent reaction with the treatment agent. The control unit 11 includes a pH meter, an ORP meter and a central control console. The signal input ends of the pH meter and the ORP meter are arranged in the reactor 2, and the signal output ends are connected to the central control console. The central control console monitors the measurement data of the pH meter and the ORP meter in real time during the reaction process. When the set value is reached, the operation of the reactor 2 is stopped. The treatment steps are as follows: A) transporting the wastewater to reactor 2 through a metering pump; B) injecting the treatment agent in the base liquid preparation tank 1 into the reaction kettle 2 through a metering pump, and controlling the volume ratio of the treatment agent to the wastewater to be 1:50; C) At 35°C, use ultrasonic vibration at a frequency of 20kHz to diffuse the treatment agent into the wastewater, and use a pH meter and ORP meter to continuously monitor the pH and ORP values ​​of the solution; when the pH value rises to 7.5 and the ORP value rises to -150, stop the reaction and obtain the reaction solution; D) The reaction solution was transported to a sedimentation tank and allowed to stand for 3 hours; E) The upper clear liquid flows into the pH monitoring and regulating tank 4, and the lower sediment is discharged from the discharge port at the bottom of the sedimentation tank 3; F) Extract clear liquid from the detection port at the top of the pH monitoring and adjustment tank 4 to measure the copper content, pH value and ORP value.

[0037] Test results: copper 1.21 mg / L, pH 7.5, ORP, -150 mV; Continue to use the nanofiltration membrane with a precision of 0.45μm for further filtration, and the copper removal rate after filtration is 100%; Example 4: The pollutant to be treated is chromium-contaminated soil, the initial chromium content of the soil is 100 mg / kg, and the soil moisture content is 15%.

[0038] The treating agent used is a hydrated electronic base liquid with a mass concentration of 5%, a pH of 14, and an ORP of -350mV.

[0039] like Figure 2 As shown, the equipment used includes a syringe 5, a spray line 6, a spray head 7, a soil sampler and a heavy metal detector. The processing steps are as follows: Method 1: Washing by injection a) Evenly distribute injection points in the contaminated area to leach the contaminated soil, with a spacing of 1.5 meters between adjacent injection points; b) a syringe 5 is provided at each injection point, and a treatment agent is injected into the soil through the syringe 5, with the amount of 30 liters per cubic meter of soil; c) After injection, use mechanical equipment to till the soil to increase the contact between the base fluid and the pollutant; d) Take samples at intervals of 7 days, 14 days, and 30 days to test the heavy metal content in the soil. During the sampling process, it is necessary to pay attention to the multi-layer setting of sampling points, and take samples in the shallow layer 8, the middle layer 9, and the deep layer 10 respectively, so as to ensure the accuracy of the test results. The test can be carried out by inductively coupled plasma mass spectrometer and inductively coupled plasma spectrometer.

[0040] The details are as follows: Monitoring program - Sampling depth: 0-60cm layered - Monitoring frequency: 7 / 14 / 30 days - Number of sampling points: 3 parallel samples per layer Monitoring results Depth direction: - Surface layer (0-20cm): removal rate 85% - Middle layer (20-40cm): removal rate 81% - Deep layer (40-60cm): removal rate 74% Time direction: - 0-7 days: Rapid decline period, chromium content 60mg / kg - 7-14 days: stable decline period, chromium content 35mg / kg - 14-30 days: Slow decline period, chromium content 15mg / kg Horizontal direction: - Around the injection point: removal rate>90% - Middle area: removal rate 75-90% - Edge area: removal rate <75% Example 5: The pollutant to be treated is chromium-contaminated soil, the soil moisture content is 30%, and the initial chromium content is 100 mg / kg.

[0041] The treating agent used is a hydrated electronic base liquid with a mass concentration of 1%, a pH of 13, and an ORP of -200mV.

[0042] like Figure 2 As shown, the equipment used includes a syringe 5, a spray line 6, a spray head 7, a soil sampler and a heavy metal detector. The processing steps are as follows: Method 2: Rinse by surface spraying A sprinkler pipeline 6 is pre-buried 30 cm below the soil in the contaminated area. A number of sprinklers 7 are evenly arranged on the pipeline. The spacing between adjacent sprinklers 7 is 2.5 meters. The water inlet end of the sprinkler 7 is connected to the sprinkler pipeline 6, and the water outlet end is located above the ground surface. b) The treatment agent is stored in the spraying pipeline 6 and then sprayed on the ground surface through the spray head 7, and the amount used is also 70 liters per cubic meter of soil; c) After spraying, use mechanical equipment to till the soil to increase the contact between the base liquid and the pollutants; d) Take samples at intervals of 7 days, 14 days, and 30 days to test the heavy metal content in the soil.

[0043] Experimental Results Monitoring program - Sampling depth: 0-60cm layered - Monitoring frequency: 7 / 14 / 30 days - Number of sampling points: 3 parallel samples per layer Monitoring results Depth direction: - Surface layer (0-20cm): removal rate 93% - Middle layer (20-40cm): removal rate 82% - Deep layer (40-60cm): removal rate 71% Time direction: - 0-7 days: Rapid decline period, chromium content 54mg / kg - 7-14 days: stable decline period, chromium content 27mg / kg - 14-30 days: Slow decline period, chromium content 11mg / kg Horizontal direction: - Around the injection point: removal rate>91% - Middle area: removal rate 76-88% - Edge area: removal rate <75% With the continuous improvement of environmental protection requirements, heavy metal pollution control technology will inevitably move towards a development trend of high efficiency, low consumption, intelligence and resource utilization. The present invention realizes the direct reduction of heavy metal ions by innovatively utilizing the strong reducing effect of hydrated electronic base liquid, which not only overcomes many limitations of traditional technologies, but also has significant advantages in treatment efficiency, environmental friendliness and economy, providing a new technical path for heavy metal pollution control.

Claims

1. A heavy metal pollution treatment agent, characterized in that: The treatment agent includes a hydrated electronic base liquid with a mass concentration of 0.1-5%, and the balance is water; The pH value of the treatment agent is 9-14, and the ORP value is -100 to -350 mV.

2. A method for treating heavy metal pollution, characterized in that: The following steps are involved: 1) Detect the initial pH value and heavy metal content of heavy metal pollutants and record the temperature of pollutants; 2) Mixing the treatment agent with the heavy metal-containing pollutants; 3) Monitor the pH value, ORP value or heavy metal content of pollutants, control the reaction time, and reduce metal ions to metal elements or insoluble compounds; 4) Separate the sediment and remove heavy metals from pollutants.

3. The method for treating heavy metal pollution according to claim 2, characterized in that: The heavy metal pollutants include wastewater or waste soil.

4. A method for treating heavy metal pollution according to claim 3, characterized in that: When the pollutant to be treated is wastewater, the specific treatment steps are as follows: 1) Pollutant detection: - Determine the initial pH value, ORP value and heavy metal content of heavy metal pollutants; - Recording of pollutant temperature; 2) Mixed pollutants and treatment agents: - Control the mixing ratio of treatment agent to pollutant within the range of 1:10-1:50; - Mixing reaction is carried out in the temperature range of 15-35℃; - Use stirring or ultrasound to promote mixing, with a stirring speed of 60-120r / min; 3) Process monitoring: - Real-time monitoring of the pH and ORP value of the reaction system; - When the system pH value rises to 5.5-7.5 and the ORP value rises to -30~-150mV, the reaction ends; 4) Solid-liquid separation: - Use sedimentation first and filtration later to separate solid and liquid; - The precipitation time is not less than 2 hours; the heavy metal residue in the upper clear liquid after precipitation is measured, and the pH of the clear liquid is adjusted to 7; - The clear liquid is further filtered using a filter membrane with a filtration accuracy of ≤0.45μm to determine the residual heavy metal content in the treated water.

5. A method for treating heavy metal pollution according to claim 3, characterized in that: When the treated material is waste soil, the mixing method is to first wash and then plow, wash at least once, and after plowing, control the reaction time by monitoring the heavy metal content in the pollutants; The processing parameters are: - Soil moisture content: 15-30% - Treatment agent dosage: 30-70L / m³ soil - Injection point spacing: 1.5-2.5m - Response time: 7-30 days - Soil tillage depth: 30-50cm.

6. A method for treating heavy metal pollution according to claim 5, characterized in that: The washing is performed by surface spraying.

7. A heavy metal pollution treatment device, characterized in that: It includes a treatment agent preparation unit, a metering unit, a reaction unit, a precipitation separation unit, a pH monitoring and adjustment unit and a control unit; The feed end of the reaction unit is connected to the treatment agent preparation unit and the external sewage to be treated, and the volume ratio of the treatment agent and the sewage flowing into the reaction unit is controlled by the metering unit; the discharge end of the reaction unit is connected to the water inlet of the precipitation separation unit; The water outlet of the sedimentation and separation unit is connected to the water inlet of the pH monitoring and adjustment unit, and a sediment discharge port is provided at the bottom thereof; The water outlet of the pH monitoring and regulating unit is used to discharge the treated water that meets the standards, and a detection port is provided on the top thereof for sampling the pH value of the treated wastewater; The control unit is used to monitor the pH value and ORP value of the mixed liquid in the reaction unit.

8. A heavy metal pollution treatment device according to claim 7, characterized in that: The metering unit adopts a metering pump; the reaction unit adopts a ceramic stirring reactor or a tubular reactor; the precipitation and separation unit is a sedimentation tank, a high-efficiency clarifier or a centrifuge.

9. A heavy metal pollution treatment device according to claim 7 or 8, characterized in that: The control unit also includes an online heavy metal content monitoring device, which is used to monitor the heavy metal content of the treated water of the pH monitoring and adjustment unit.

10. A heavy metal pollution treatment device according to claim 7 or 8, characterized in that: It also includes a treated water return pool and a resource recovery treatment unit; The treated water reflow tank is used to recycle and store treated water, and its water inlet is provided with a nanofiltration membrane connected to the water outlet of the pH monitoring and regulating unit; The resource recovery processing unit is used to recover valuable metals, and its feed port is connected to the sediment discharge port of the sedimentation separation unit.

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