Hydrolysis device for organic matter-rich wastewater based on photoelectrochemistry

Abstract

The utility model discloses a photoelectrochemistry-based organic matter-rich wastewater hydrolysis device which comprises a hydrolysis acid production tank, a water inlet and a gas outlet are arranged on the hydrolysis acid production tank, the water inlet is connected with a water inlet pipe, the water inlet pipe is connected with a reservoir, a water delivery pump is arranged in the reservoir, the gas outlet is connected with a gas outlet pipe, and the gas outlet pipe is connected with a gas collection tank; a photoelectrochemical integrated device for accelerating the hydrolysis acid production process is arranged on the inner wall of the hydrolysis acid production tank, and a stirring device is arranged in the hydrolysis acid production tank; the hydrolysis acid production tank is provided with a main feed port and an auxiliary feed port, the bottom of the hydrolysis acid production tank is provided with a liquid outlet and a slag outlet, the liquid outlet is connected with a liquid outlet pipe, and the slag outlet is connected with a slag outlet pipe. The method is convenient, fast and high in feasibility, proliferation and metabolism of microorganisms are promoted through the photoelectrochemical integrated device, the reaction speed can be greatly increased, then the treatment effect and treatment efficiency of the wastewater are integrally improved, and the technical problems that existing organic matter-rich wastewater is poor in treatment effect and low in treatment efficiency are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental engineering and renewable energy, and in particular relates to a hydrolysis device for organic-rich wastewater based on photoelectrochemistry. Background Art

[0002] Organic-rich wastewater refers to wastewater that mainly contains complex organic compounds such as carbohydrates, proteins, and fats at high concentrations. Its main sources include kitchen wastewater, agricultural and animal husbandry wastewater, and other organic-rich wastewater. Improper treatment of such wastewater will not only cause waste of resources, but also easily lead to serious environmental pollution and other problems. At present, the main method used to treat organic-rich wastewater is physical and chemical methods. The purpose is to remove harmful substances, improve resource utilization, and reduce the pollution of wastewater to the environment by recovering useful components in the wastewater or treating some substances that are difficult to degrade biologically. Commonly used physical and chemical methods include extraction, adsorption, concentration, ultrasonic degradation, etc. The problems existing in this type of wastewater treatment method mainly include low treatment efficiency, difficulty in degrading some organic matter, high treatment cost, secondary pollution, etc. Therefore, a hydrolysis device with good treatment effect and high treatment efficiency is needed. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a hydrolysis device for organic-rich wastewater based on photoelectrochemistry with good treatment effect and high treatment efficiency. A photoelectrochemical integrated device is arranged in a hydrolysis acid production tank, thereby improving the treatment efficiency and treatment effect of the wastewater.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a hydrolysis device for organic-rich wastewater based on photoelectrochemical technology, comprising a hydrolysis acid production tank, a top cover of which is provided with a water inlet and an air outlet, the water inlet is connected to a water inlet pipe, the water inlet pipe is connected to a water reservoir, a water delivery pump is provided in the water reservoir, the air outlet is connected to an air outlet pipe, and the air outlet pipe is connected to a gas collection tank;

[0005] A photoelectrochemical integrated device for accelerating the hydrolysis and acid production process is arranged on the inner wall of the hydrolysis and acid production tank, and a stirring device is arranged inside the hydrolysis and acid production tank;

[0006] The hydrolysis acid production tank is provided with a main feed inlet and a secondary feed inlet, and the bottom of the hydrolysis acid production tank is provided with a liquid outlet and a slag outlet, the liquid outlet is connected to a liquid outlet pipe, and the slag outlet is connected to a slag outlet pipe.

[0007] The photoelectrochemical integrated device comprises an integrated board, on which an upper groove, a middle groove and a lower groove are arranged, the upper groove and the lower groove are provided with electrochemical devices, and the middle groove is provided with a photochemical device.

[0008] The electrochemical device comprises a microbial fuel cell, the microbial fuel cell is connected with a wire, and the wire is connected to a voltage stabilizing device and an external power source through a guide hole arranged on a hydrolysis acid generating tank.

[0009] The photochemical device comprises an LED light strip, which is a blue-green LED light. The LED light strip is installed in the middle groove, the anode of the microbial fuel cell is installed in the upper groove, and the cathode of the microbial fuel cell is installed in the lower groove.

[0010] The water inlet pipe is provided with a water inlet valve, the air outlet is provided with an air outlet valve, and the liquid outlet pipe is provided with a liquid outlet valve.

[0011] A monitoring system for monitoring the experimental process is installed in the hydrolysis acid production tank. The monitoring system includes:

[0012] A control module, including a PLC controller, for sending control instructions according to the measurement results;

[0013] An execution module is used to receive control instructions from the PLC controller and adjust the voltage of the light strip and each valve according to the control instructions;

[0014] The sensor module includes several types of sensors and is used to collect environmental data in the hydrolysis acid production tank and transmit the measured data to the control module.

[0015] By adopting the above technical scheme, when the utility model is in use, the organic-rich wastewater that has been pre-treated by solid-liquid separation, oil-water separation, etc. is first added to the hydrolysis acid production tank, and then the first photoelectrochemical material is added to the hydrolysis acid production tank through the auxiliary feed port, the photoelectrochemical integrated device is started, the voltage and current of the electrochemical device are adjusted to appropriate voltage and current parameters, the light intensity and irradiation time are adjusted according to demand, and blue-green light is used as the main light to fully stimulate the light response characteristics of acid-producing bacteria and hydrolytic bacteria, thereby promoting the proliferation and metabolism of microorganisms and accelerating the formation of dominant bacterial communities; the stirring device is started to ensure that the materials in the tank are evenly mixed, improve the effects of the light and electrochemical devices, accelerate the reaction, and thus achieve the purpose of improving the wastewater treatment efficiency and treatment effect.

[0016] To sum up, the utility model is convenient, fast and highly feasible. It uses a photoelectrochemical integrated device to promote the proliferation and metabolism of microorganisms, thereby greatly improving the reaction speed and thus improving the overall treatment effect and efficiency of wastewater, effectively solving the technical problems of low efficiency and poor treatment effect of existing organic-rich wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 The utility model is a flow chart of hydrolysis acid production. DETAILED DESCRIPTION

[0020] like Figure 1-Figure 3 As shown, the hydrolysis device of organic-rich wastewater based on photoelectrochemistry of the utility model comprises a hydrolysis acid production tank 1, a water inlet and an air outlet are arranged on the top cover of the hydrolysis acid production tank 1, the water inlet is connected to a water inlet pipe 2, the water inlet pipe 2 is connected to a water reservoir, a water delivery pump is arranged in the water reservoir, the air outlet is connected to an air outlet pipe 3, and the air outlet pipe 3 is connected to a gas collection tank;

[0021] A photoelectrochemical integrated device 4 for accelerating the hydrolysis and acid production process is arranged on the inner wall of the hydrolysis and acid production tank 1, and a stirring device 5 is arranged inside the hydrolysis and acid production tank 1;

[0022] The hydrolysis acid production tank 1 is provided with a main feed inlet and a secondary feed inlet, and the bottom of the hydrolysis acid production tank 1 is provided with a liquid outlet and a slag outlet. The liquid outlet is connected to a liquid outlet pipe 7, and the slag outlet is connected to a slag outlet pipe 6.

[0023] The photoelectrochemical integrated device 4 comprises an integrated board 8, on which an upper groove, a middle groove and a lower groove are arranged, the upper groove and the lower groove are provided with an electrochemical device 9, and the middle groove is provided with a photochemical device 10. The integrated board 8 is made of insulating material.

[0024] The electrochemical device 9 includes a microbial fuel cell, and a wire 11 is connected to the microbial fuel cell. The wire 11 is connected to a voltage stabilizing device and an external power supply through a guide hole set on the hydrolysis acid production tank 1. The microbial fuel cell is modularly designed, and a single module can treat a certain amount of organic-rich wastewater. The number of installations can be adjusted according to different wastewater characteristics and treatment requirements to achieve flexible treatment capacity and facilitate later repair and maintenance. Each module is provided with a positive and negative electrode. The positive and negative electrodes of the microbial fuel cell are made of carbon cloth material with a thickness of 0.5 to 2 mm and a width of 2 to 5 cm. The positive and negative electrodes of the microbial fuel cell are close to the tank wall and fixed at a distance by an integrated board 8 to ensure uniform electric field distribution between the electrodes, maximize the efficiency of electron transfer and light utilization, and effectively promote electrochemical reactions. Among them, the surface of the cathode of the microbial fuel cell is covered with a hematite catalyst film treatment (and doped with 5% TiO2) to accelerate the redox reaction involving electrons, protons and receptors in the electrolyte to generate water or other compounds, thereby increasing the reaction rate;

[0025] The photochemical device 10 comprises an LED light strip, which is a blue-green LED light. The LED light strip is installed in the middle groove, the upper groove is installed with the anode of the microbial fuel cell, and the lower groove is installed with the cathode of the microbial fuel cell.

[0026] The water inlet pipe 2 is provided with a water inlet valve, the air outlet is provided with an air outlet valve, and the liquid outlet pipe 7 is provided with a liquid outlet valve.

[0027] A monitoring system for monitoring the experimental process is provided in the hydrolysis acid generating tank 1, and the monitoring system includes:

[0028] A control module, including a PLC controller, for sending control instructions according to the measurement results;

[0029] An execution module is used to receive control instructions from the PLC controller and adjust the voltage of the light strip and each valve according to the control instructions;

[0030] The sensor module includes several types of sensors, which are used to collect environmental data in the hydrolysis acid production tank 1 and transmit the measured data to the control module. The photoelectrochemical material is pretreated hematite. 2-5g / L hematite is added from the first auxiliary feed port as the first photochemical material. Under the action of the stirring device 5, suitable hydrodynamic conditions are formed, which can enable the fermentation liquid to drive the hematite to circulate in the LED light irradiation area to receive light, give full play to the photocatalytic effect, promote electron transfer, and increase the fermentation rate. The LED light strips installed in the two tanks adjust the light intensity between 100-300μmol / m 2 / s, and the illumination time is 60 min / d. The pretreatment process of hematite is:

[0031] ① Crush the raw hematite to a diameter of 0.5-2 mm;

[0032] ② Roast the crushed hematite sample in air at a temperature of 400-600°C for 1-2 h;

[0033] ③ Soak the roasted hematite in dilute hydrochloric acid for 1 to 2 hours;

[0034] ④ The acid-washed hematite is washed several times with a large amount of deionized water until the pH of the washing water is close to neutral, and then dried in hot air at 60-80°C to constant weight for use.

[0035] When the utility model is used, the organic-rich wastewater that has been pre-treated by solid-liquid separation, oil-water separation, etc. is first added to the hydrolysis acid production tank 1, and then the photoelectrochemical material is added to the hydrolysis acid production tank 1 through the auxiliary feed port, the photoelectrochemical integrated device 4 is started, the voltage and current of the electrochemical device 9 are adjusted to appropriate voltage and current parameters, and the light intensity and irradiation time are adjusted according to demand, with blue-green light as the main light, to stimulate the light response characteristics of microorganisms, thereby promoting the proliferation and metabolism of microorganisms and accelerating the formation of dominant bacterial flora; the stirring device 5 is started to ensure that the materials in the tank are evenly mixed, improve the effects of the light and electrochemical devices 9, accelerate the reaction, and thus achieve the purpose of improving the wastewater treatment efficiency and treatment effect, and effectively solve the technical problems of low efficiency and poor treatment effect of the existing organic-rich wastewater treatment.

[0036] This application is mainly applicable to the treatment of organic wastewater such as kitchen wastewater, agricultural and animal husbandry wastewater. Taking kitchen wastewater as an example, the system operation steps and treatment effects are introduced in detail. The pretreatment of kitchen wastewater mainly includes solid-liquid separation, grease separation and filtration. The main components of pretreated kitchen wastewater are dissolved complex organic matter, suspended solid particles, a small amount of grease, etc. Among them, the dissolved complex organic matter mainly includes easily degradable sugars, fats and proteins, etc., with a total organic carbon (TOC) of about 15,000 mg / L; suspended solid particles are mainly food residues and undigested solids, about 5,000 mg / L; cooking grease from kitchen wastewater is about 2,000 mg / L.

[0037] First, the organic-rich wastewater after pretreatment is injected into the hydrolysis acid production tank 1; then the hydrolysis acid production bacteria group with relatively good fermentation effect in the hydrolysis acid production tank 1 is inoculated: the photoelectrochemical device 9 and the stirring device 5 in the hydrolysis acid production tank 1 are started; the pretreated photoelectrochemical material hematite is added to carry out fermentation. During the fermentation process, the monitoring device performs real-time monitoring and makes corresponding adjustments according to the environmental data. After the fermentation is completed, the fermentation liquid is sent out through the liquid outlet for the next step of processing, the solid residue is discharged through the residue outlet, and clean water is introduced into the water inlet pipe 2 in time for cleaning so as to facilitate the next use.

[0038] It should be emphasized that the control module, sensor module, execution module, water inlet valve, air outlet valve and other components in the utility model are all existing conventional technologies, and the specific structure and principle will not be repeated. The automatic control involved in the utility model does not involve new computer programs.

[0039] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the protection scope of the technical solution of the utility model.

Claims

1. A device for hydrolyzing organic-rich wastewater based on photoelectrochemistry, characterized in that: It comprises a hydrolysis acid production tank, the top cover of which is provided with a water inlet and an air outlet, the water inlet is connected to a water inlet pipe, the water inlet pipe is connected to a water reservoir, a water delivery pump is provided in the water reservoir, the air outlet is connected to an air outlet pipe, and the air outlet pipe is connected to a gas collection tank; A photoelectrochemical integrated device for accelerating the hydrolysis and acid production process is arranged on the inner wall of the hydrolysis and acid production tank, and a stirring device is arranged inside the hydrolysis and acid production tank; The hydrolysis acid production tank is provided with a main feed inlet and a secondary feed inlet, and the bottom of the hydrolysis acid production tank is provided with a liquid outlet and a slag outlet, the liquid outlet is connected to a liquid outlet pipe, and the slag outlet is connected to a slag outlet pipe.

2. The device for hydrolyzing organic-rich wastewater based on photoelectrochemistry according to claim 1, characterized in that: The photoelectrochemical integrated device comprises an integrated board, on which an upper groove, a middle groove and a lower groove are arranged, the upper groove and the lower groove are provided with electrochemical devices, and the middle groove is provided with a photochemical device.

3. The device for hydrolyzing organic-rich wastewater based on photoelectrochemistry according to claim 2, characterized in that: The electrochemical device comprises a microbial fuel cell, the microbial fuel cell is connected with a wire, and the wire is connected to a voltage stabilizing device and an external power source through a guide hole arranged on a hydrolysis acid generating tank.

4. The device for hydrolyzing organic-rich wastewater based on photoelectrochemistry according to claim 3, characterized in that: The photochemical device comprises an LED light strip, which is a blue-green LED light. The LED light strip is installed in the middle groove, the anode of the microbial fuel cell is installed in the upper groove, and the cathode of the microbial fuel cell is installed in the lower groove.

5. The device for hydrolyzing organic-rich wastewater based on photoelectrochemistry according to claim 4, characterized in that: The water inlet pipe is provided with a water inlet valve, the air outlet is provided with an air outlet valve, and the liquid outlet pipe is provided with a liquid outlet valve.

6. The device for hydrolyzing organic-rich wastewater based on photoelectrochemistry according to claim 5, characterized in that: A monitoring system for monitoring the experimental process is installed in the hydrolysis acid production tank. The monitoring system includes: A control module, including a PLC controller, for sending control instructions according to the measurement results; An execution module is used to receive control instructions from the PLC controller and adjust the voltage of the light strip and each valve according to the control instructions; The sensor module includes several types of sensors and is used to collect environmental data in the hydrolysis acid production tank and transmit the measured data to the control module.

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