CN218903059U - Electrochemical soil pollution prosthetic devices based on PLC control - Google Patents
Electrochemical soil pollution prosthetic devices based on PLC control Download PDFInfo
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Abstract
The utility model discloses an electrochemical soil pollution restoration device based on PLC control, and belongs to the technical field of soil pollution restoration. The solar photovoltaic device comprises a solar photovoltaic panel and a photovoltaic panel controller, wherein the solar photovoltaic panel is connected with a storage battery through the photovoltaic panel controller; the electrochemical reaction chamber is provided with a soil filling chamber above, and a spraying system is arranged above the soil filling chamber. The utility model cooperatively couples a solar photovoltaic system, advanced oxidation-electrochemistry and microorganism remediation organic matter polluted soil technology, increases desorption and dissolution of organic chlorohydrocarbons on the surface of soil particles, can obviously improve degradation and remediation efficiency of the organic chlorohydrocarbons in soil, realizes in-situ and ex-situ soil pollution remediation, realizes automatic and intelligent operation control through a PLC control system, and has the advantages of reasonable design, simple structure, convenient operation control, strong applicability and high efficiency of soil remediation.
Description
Technical Field
The utility model relates to the technical field of soil pollution remediation, in particular to an electrochemical soil pollution remediation device based on PLC control.
Background
Soil is the material basis upon which humans and organisms survive. With the development of industry, the use amount of organic chemical products is rapidly increased, and a large pollution risk is brought to the soil-underground environment. The organic chlorohydrocarbon belongs to organic pollutants which are difficult to degrade, has the characteristics of low solubility, high ecological toxicity, strong biological residue and the like, damages tissues, organs and nervous systems, and causes biological carcinogenesis and teratogenesis, thus receiving wide attention. The organochlorohydrocarbon continuously migrates to deep soil after entering surface water body or soil-groundwater environment through accidental leakage or wastewater discharge and the like, slowly dissolves in groundwater, pollutes soil groundwater and causes serious threat to human health and ecological safety. Therefore, the method has important significance in carrying out the repair work of the organochlorohydrocarbon polluted soil.
Currently, the technology of repairing organochlorohydrocarbon soil pollution mainly includes physical (CN 203875107U), chemical (CN 101053689) and biological repair technology (CN 104438298 a). Physical repair techniques include excavation landfill sealing, vapor extraction, thermal desorption, electric repair, and the like. The excavation, landfill and sealing can only control the migration range of pollutants, and can not thoroughly remove organic chlorohydrocarbon pollutants in soil. The vapor extraction is carried out by filling flowing vapor into the embedded pipeline, taking volatile organic chlorohydrocarbon out of the ground by utilizing the fluidity of the vapor, and then carrying out adsorption collection treatment. The thermal desorption technology is characterized in that the organic chlorohydrocarbon polluted soil is heated in professional equipment, so that the organic chlorohydrocarbon reaches the boiling point to be desorbed and separated from the soil, and the organic chlorohydrocarbon is collected and treated independently.
Chemical remediation degrades organochlorohydrocarbons in soil to low-or non-toxic substances by solvent extraction, leaching, chemical oxidation, and the like. The solvent extraction and leaching method utilizes the principle that the solvent is similar to the organic chlorohydrocarbon, realizes the removal of the organic chlorohydrocarbon in the soil, and is suitable for the soil with serious pollution. The chemical oxidation technology utilizes a strong oxidant to oxidize and degrade the organochlorohydrocarbon into low-toxicity or nontoxic micromolecular substances, has strong applicability and short repair time, and has wide application prospect.
The bioremediation technology is mainly divided into microbial and plant remediation, and is a green remediation technology. Repairing polluted soil by microorganisms through cell metabolism, surface biological macromolecule absorption and transportation, precipitation, redox reaction and the like; the plants repair the polluted soil mainly through methods of absorption, degradation, transformation, volatilization and the like. The method has the advantages of low bioremediation cost, less influence on soil properties and ecological environment, environmental friendliness, long time consumption and inapplicability to pollution sites with serious pollution, sudden pollution and urgent need of development and utilization.
The utility model provides a soil organic chlorine pollution repair method with strong applicability and high repair efficiency by cooperatively coupling surfactant-chelating agent reinforced advanced oxidation-electrochemistry and microorganism repair technologies by comprehensively comparing the characteristics of the repair methods. The strong oxidant is Fenton reagent, persulfate, permanganate, etc. The persulfate has good stability, high safety and strong engineering applicability, and becomes the first choice of repair reagents. However, the persulfate has slower reaction with the organochlorohydrocarbon pollutant and poor degradation effect, and needs to generate sulfate radical (SO 4. With stronger oxidability under the actions of alkali, heat, transition metal and the like - ) The degradation rate and degradation effect of the organic matters are improved. Because of high thermalization cost and inconvenient engineering implementation, the device adopts zero-valent ironCitric acid/sodium citrate chelated Fe 2+ Activating sodium persulfate to produce SO4 ] - Aims at improving the activation efficiency of sodium persulfate and SO4 - SO4 - Has better degradation effect on dissolved organic chlorohydrocarbon. In addition, the surfactant has the functions of solubilization, surface tension reduction and the like, can dissolve and release organic chlorohydrocarbon adsorbed on the surface of soil particles, promotes the effective contact of organic matters and an oxidant, and remarkably improves the reaction rate.
The electrochemical system can improve the activity and diversity of microorganisms, maintain the stability of pollutant removal, the anode electrode can improve the adhesion of microorganisms on the electrode, and the organic pollutants are oxidatively decomposed by utilizing the synergistic effect of the microorganisms and electrochemistry, so that the electron transfer is promoted, and the degradation rate of the organic matters in the polluted soil can be obviously improved.
Solar energy is clean and green renewable energy, and electric energy generated by solar energy photovoltaic is utilized to drive an electrochemical system, so that the remediation efficiency of polluted soil is improved, and the remediation cost of soil pollutants is greatly reduced. In addition, the PLC control system is used for realizing informatization, automation and intelligent operation control of organic matter polluted soil restoration, saving manpower, material resources and financial resources, and being capable of generating better economic benefit, environmental benefit and ecological benefit and realizing the power-assisted double-carbon target.
Disclosure of Invention
1. Technical problem to be solved by the utility model
Aiming at the defects and shortcomings of the prior art, the utility model provides an electrochemical soil pollution restoration device based on PLC control, and aims at the defects of low efficiency, long time consumption, limited applicability and the like of the existing organic matter pollution soil restoration technology, and provides a high-grade oxidation-electrochemical soil pollution restoration device and method based on PLC control by taking a solar photovoltaic system as an electric driving force, which are used for cooperatively coupling the solar photovoltaic system, the high-grade oxidation-electrochemical and microorganism organic matter pollution soil restoration technology, so that the desorption and dissolution of organic chlorohydrocarbons on the surface of soil particles are increased, the degradation and restoration efficiency of the organic chlorine pollutants in soil can be remarkably improved, and the in-situ and ex-situ soil pollution restoration is realized.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:
the utility model relates to an electrochemical soil pollution restoration device based on PLC control, which comprises a solar photovoltaic device, a storage battery, a soil filling chamber, an electrochemical reaction chamber and a PLC automatic control system, wherein the solar photovoltaic device comprises a solar photovoltaic panel and a photovoltaic panel controller, and the solar photovoltaic panel is connected with the storage battery through the photovoltaic panel controller;
the upper part of the electrochemical reaction chamber is provided with a soil filling chamber through a supporting layer, the upper part of the soil filling chamber is provided with a spraying system, the input end of the spraying system is connected with an oxidizing reagent conveying pipeline, the oxidizing reagent conveying pipeline is provided with a circulating water pump and an electromagnetic valve, the input end of the electrochemical reaction chamber is provided with a microbial agent conveying pipeline, the pipeline of the microbial agent conveying pipeline is also provided with a circulating water pump and an electromagnetic valve, the output end of the electrochemical reaction chamber is connected with a reagent recovery pipeline, the reagent recovery pipeline is provided with an electromagnetic valve, and one end of the reagent recovery pipeline is connected with a reagent collecting tank;
a three-dimensional grid battery is arranged in the electrochemical reaction chamber, an anode electrode and a cathode electrode are arranged in the three-dimensional grid battery, and nano zero-valent iron is arranged on one side of the anode electrode;
the storage battery is connected with an anode electrode and a cathode electrode in the electrochemical reaction chamber;
the execution module of the PLC automatic control system comprises a circulating water pump, an electromagnetic valve and a spraying system.
The soil filling chamber is filled with polluted soil, the concentration of organic matters in the soil is not lower than 100mg/kg, and a sampling pore canal baffle is arranged in the soil filling chamber;
the sampling pore canal partition plate consists of a first sampling unit, a second sampling unit and a third sampling unit, wherein the first sampling unit, the second sampling unit and the third sampling unit are sequentially arranged and are in a ladder shape, and a conical guide head is arranged at one side end part of the third sampling unit;
the first sampling unit, the second sampling unit and the third sampling unit are all composed of sampling plates and supporting boxes;
the sampling plate is arranged at the top of the supporting box, a sampling groove is formed in the plate surface of the sampling plate, and a sensor embedding groove is formed in a groove hole of the sampling groove;
the support box is internally provided with a support rib, and the upper part of the support rib is provided with a support cushion layer; the upper surface of the supporting cushion layer is attached to the lower surface of the sampling plate.
Further, the PLC automatic control system comprises a data acquisition system, a PLC controller and an execution module, wherein the data acquisition system comprises a conductivity sensor, a dissolved oxygen sensor, a microorganism sensor, a free radical sensor, an organic matter sensor and an A/D converter; the water quality detection information is input into the PLC through the A/D converter;
the conductivity sensor, the dissolved oxygen sensor, the microorganism sensor, the free radical sensor and the organic matter sensor are respectively embedded in different sensor embedding grooves;
the PLC is connected with the execution module to complete the automatic and intelligent operation control of the solar photovoltaic driven advanced oxidation-electrochemical soil pollution repair device, the PLC is connected with the management computer through the RS232 communication interface, and the PLC is also connected with the man-machine interaction device through the RS485 for man-machine interaction to process the input and output information of the soil pollution repair device.
Further, the solar photovoltaic device provides green clean electric energy through solar power generation.
Furthermore, the reagent addition of the spraying system and the electrochemical reaction chamber is performed by controlling a circulating water pump and an electromagnetic valve through a PLC automatic control system.
Further, the anode electrode of the three-dimensional grid battery is made of a conductive metal organic framework material, iron or a porous carbon material, and nano zero-valent iron is arranged at the position cm away from the anode; the cathode electrode is a graphite rod, titanium or stainless steel net, and the voltage range for driving the bioelectrochemical soil restoration is 0-2V.
Further, a spraying system is arranged above the soil filling chamber, a spraying solution is a surfactant-chelating agent enhanced advanced oxidation repair reagent, the components of the spraying system are surfactant, sodium persulfate, chelating agent, ferrous salt and pH regulator, the chelating agent is citric acid or sodium citrate, the dosage of the nonionic surfactant polysorbate 80 (Tween 80) is 0.5-1 times of the total organic matter in the polluted soil, the molar ratio of the sodium persulfate to the sodium citrate to the ferrous salt to the pH regulator is 1-15:1-20:1-4, the pH range is 6-7, and the working procedure of the spraying system 6 is set through a PLC controller of a PLC automatic control system, so that the additive amount and time of the repair reagent are controlled.
Further, the electrochemical reaction chamber is added with a proper amount of microbial agent and necessary nutrient elements through a microbial agent conveying pipeline, the necessary nutrient elements of the microorganisms are 0.8-5.5 ml/L, and the solution additive amount and time are controlled through a working program set by a PLC controller of a PLC automatic control system.
Further, the soil pollutant is organic chlorohydrocarbon pollutant, including one or more of tetrachloroethylene (PCE), trichloroethylene (TCE), trichloromethane (TCA) and 1, 2-dichloroethane.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
aiming at the defects of low efficiency, long time consumption, limited applicability and the like of the existing organic matter contaminated soil remediation technology, the utility model provides the advanced oxidation-electrochemical soil pollution remediation device and the advanced oxidation-electrochemical soil pollution remediation method based on PLC control by taking the solar photovoltaic system as the electric driving force, which are used for cooperatively coupling the solar photovoltaic system, the advanced oxidation-electrochemical and the microorganism contaminated soil remediation technology, so that the desorption and dissolution of the organic chlorohydrocarbon on the surface of soil particles are increased, the degradation and remediation efficiency of the organic chlorine contaminants in the soil can be remarkably improved, and the in-situ and ex-situ soil pollution remediation is realized.
The utility model realizes the automatic and intelligent operation control of the organic chlorine polluted soil restoration through the PLC control system, has the advantages of reasonable design, simple structure, convenient operation control, strong applicability and high efficiency of soil restoration, realizes the real-time monitoring and acquisition of soil information through the PLC controller, saves manpower, material resources and financial resources, can generate better economic benefit, environmental benefit and ecological benefit, and promotes the realization of the double carbon target.
Drawings
FIG. 1 is an overall block diagram of the present utility model;
FIG. 2 is a schematic diagram of a PLC control architecture of the present utility model;
FIG. 3 is a diagram showing the implementation effect of the present utility model;
FIG. 4 is a block diagram of the sampling tunnel separator of the present utility model;
FIG. 5 is a diagram showing the splitting effect of the sampling unit according to the present utility model;
FIG. 6 is a cross-sectional view of a sampling plate of the present utility model.
In the figure: 1. a solar photovoltaic device; 11. a solar photovoltaic panel; 12. a photovoltaic panel controller; 2. a storage battery; 3. a soil loading chamber; 31. sampling pore canal partition plates; 311. a first sampling unit; 312. a second sampling unit; 313. a third sampling unit; 314. a conical guide head; 315. sampling a template; 3151. a sampling groove; 3152. a sensor embedding groove; 316. a support box; 317. a support rib; 318. a support cushion layer; 4. an electrochemical reaction chamber; 401. a microbial agent delivery line; 402. a reagent recovery line; 403. a reagent collection tank; 41. a three-dimensional grid cell; 42. an anode electrode; 43. a cathode electrode; 44. nano zero-valent iron; 5. a support layer; 6. a spraying system; 601. an oxidizing agent delivery line; 7. a PLC automatic control system; 71. a circulating water pump; 72. a solenoid valve.
Detailed Description
The utility model is further described below with reference to the accompanying drawings and examples:
example 1
As can be seen from fig. 1, the electrochemical soil pollution restoration device based on PLC control of the present embodiment includes a solar photovoltaic device 1, a storage battery 2, a soil filling chamber 3, an electrochemical reaction chamber 4 and a PLC automatic control system 7, wherein the solar photovoltaic device 1 includes a solar photovoltaic panel 11 and a photovoltaic panel controller 12, and the solar photovoltaic panel 11 is connected with the storage battery 2 through the photovoltaic panel controller 12;
a soil filling chamber 3 is arranged above the electrochemical reaction chamber 4 through a supporting layer 5, a spraying system 6 is arranged above the soil filling chamber 3, an oxidizing agent conveying pipeline 601 is connected to the input end of the spraying system 6, a circulating water pump 71 and an electromagnetic valve 72 are arranged on the oxidizing agent conveying pipeline 601, a microbial agent conveying pipeline 401 is arranged at the input end of the electrochemical reaction chamber 4 and used for adding microbial agents into the electrochemical reaction chamber 4, a circulating water pump 71 and an electromagnetic valve 72 are also arranged on a pipeline of the microbial agent conveying pipeline 401, a reagent recovery pipeline 402 is connected to the output end of the electrochemical reaction chamber 4, an electromagnetic valve 72 is arranged on the reagent recovery pipeline 402, and a reagent collecting tank 403 is connected to one end of the reagent recovery pipeline 402;
a three-dimensional grid battery 41 is arranged in the electrochemical reaction chamber 4, an anode electrode 42 and a cathode electrode 43 are arranged on the three-dimensional grid battery 41, and nano zero-valent iron 44 is arranged on one side of the anode electrode 42;
the battery 2 is connected to an anode electrode 42 and a cathode electrode 43 in the electrochemical reaction chamber 4;
the execution modules of the PLC automatic control system 7 comprise a circulating water pump 71, an electromagnetic valve 72 and a spraying system 6.
As can be seen from fig. 2, the PLC automatic control system 7 includes a data acquisition system, a PLC controller and an execution module, wherein the data acquisition system includes a conductivity sensor, a dissolved oxygen sensor, a microorganism sensor, a radical sensor, an organic matter sensor, and an a/D converter; the water quality detection information is input into the PLC through the A/D converter;
the PLC is connected with the execution module to complete the automatic and intelligent operation control of the solar photovoltaic driven advanced oxidation-electrochemical soil pollution repair device, is connected with the management computer through the RS232 communication interface, is also connected with the man-machine interaction device through the RS485 and is used for carrying out man-machine interaction to process the input and output information of the soil pollution repair device.
The solar photovoltaic device 1 provides green clean electric energy through solar power generation.
Reagent addition of the spraying system 6 and the electrochemical reaction chamber 4 is performed by controlling the circulating water pump 71 and the electromagnetic valve 72 through the PLC automatic control system 7.
The anode electrode 42 of the three-dimensional grid cell 41 is made of conductive metal organic framework material, iron or porous carbon material, and nano zero-valent iron 44 is arranged at a position 5cm away from the anode; the cathode electrode 43 is a graphite rod, titanium or stainless steel mesh, and the voltage for driving the bioelectrochemical soil remediation is in the range of 0-2V.
As can be seen from fig. 4 to 6, the soil filling chamber 3 is filled with polluted soil, the concentration of organic matters in the soil is not lower than 100mg/kg, and the sampling pore canal partition plate 31 is arranged in the soil filling chamber 3;
the sampling duct partition 31 is composed of a first sampling unit 311, a second sampling unit 312, and a third sampling unit 313, the first sampling unit 311, the second sampling unit 312, and the third sampling unit 313 are sequentially arranged and are in a ladder shape,
the sampling plates 315 of the first sampling unit 311, the second sampling unit 312 and the third sampling unit 313 are respectively positioned at different height positions in the soil filling chamber 3, so that the effect of sampling in layers in the soil filling chamber 3 can be realized;
one side end of the third sampling unit 313 is provided with a tapered guide head 314; the tapered guide head 314 guides the sampling tunnel barrier 31 as it goes deep into the soil packing chamber 3.
The first sampling unit 311, the second sampling unit 312 and the third sampling unit 313 are composed of a sampling plate 315 and a support box 316;
the heights of the supporting boxes 316 of the first sampling unit 311, the second sampling unit 312 and the third sampling unit 313 are different from each other,
the sampling plate 315 is mounted on the top of the support box 316, a sampling groove 3151 is formed on the plate surface of the sampling plate 315, a sensor embedding groove 3152 is formed in the slot hole of the sampling groove 3151, and a conductivity sensor, a dissolved oxygen sensor, a microorganism sensor, a free radical sensor, an organic matter sensor are respectively embedded in the different sensor embedding grooves 3152
16 sampling grooves 3151 are uniformly distributed on the surface of one sampling plate 315, and 16 groups of different data can be collected by collecting one sampling plate 315, so that the concentration of organic matters, free radicals and microorganisms in the soil filling chamber 3 can be detected in real time, the detection result is less accidentally, and the accuracy is higher;
the support box 316 is internally provided with a support rib 317, and the upper part of the support rib 317 is provided with a support cushion layer 318; the upper surface of the support cushion 318 is bonded to the lower surface of the sampling plate 315.
The support ribs 317 serve to increase the actual weight of the support box 316 and to improve the stability of the sampling tunnel barrier 31 within the soil loading chamber 3.
The support cushion 318 provides a supporting effect for the balance of the sampling plate 315, and the number of the support cushions 318 can be overlapped to match the support boxes 316 with different height sizes.
The upper part of the soil filling chamber 3 is provided with a spraying system 6, the spraying solution is a surfactant-chelating agent reinforced advanced oxidation repair reagent, the components are a surfactant, sodium persulfate, a chelating agent, ferrous salt and a pH regulator, the chelating agent is citric acid or sodium citrate, wherein the dosage of the nonionic surfactant polysorbate 80 (Tween 80) is 0.5-1 times of the total organic matter in the polluted soil, the molar ratio of the sodium persulfate to the sodium citrate to the ferrous salt to the pH regulator is 1-15:1-20:1-4, the pH range is 6-7, and the working procedure of the spraying system 6 is set through a PLC controller of the PLC automatic control system 7, so that the additive amount and time of the repair reagent are controlled.
The electrochemical reaction chamber 4 is added with a proper amount of microbial agent and necessary nutrient elements through a microbial agent conveying pipeline 401, the necessary nutrient elements of the microorganisms are 0.8-5.5 ml/L, and the solution additive amount and time are controlled through a working program set by a PLC controller of the PLC automatic control system 7.
The soil pollutant is organic chlorohydrocarbon pollutant, including one or more of tetrachloroethylene (PCE), trichloroethylene (TCE), trichloromethane (TCA) and 1, 2-dichloroethane.
A method of electrochemical soil pollution restoration device based on PLC control comprises the following steps:
step one: filling organic matter polluted soil into the soil filling chamber 3, and simultaneously adding a proper amount of microbial agents and necessary nutrient elements into the electrochemical reaction chamber 4 through a PLC control system, wherein the necessary nutrient elements of microorganisms are 0.8-5.5 ml/L;
step two: starting a spraying system 6 to spray a surfactant-chelating agent reinforced advanced oxidation reagent, fully leaching the reagent into a polluted soil layer, oxidatively degrading organic pollutants, enabling the eluted organic matters and the reacted solution to enter a solar photovoltaic-driven electrochemical reaction chamber 4, and continuously degrading the pollutants into small molecules and CO by an anode electrode 42 in the reaction chamber through microorganisms attached to an electrode biological film and low voltage provided by a storage battery 2 2 And H 2 O, stopping spraying the solution after the spraying solution fully infiltrates the polluted soil to enable the repairing agent to fully react with pollutants, detecting the concentrations of organic matters, free radicals and microorganisms in the soil filling chamber 3 and the electrochemical reaction chamber 4 in real time in the reaction process, transmitting the concentrations to a PLC (programmable logic controller) through an A/D (analog-to-digital) converter, starting an execution module by the PLC after the reaction time, the concentrations of the free radicals and the microorganisms reach set limit values, automatically opening a circulating water pump 71 to continuously spray the solution, simultaneously adding a proper amount of microbial agents and necessary nutrient elements into the electrochemical reaction chamber 4, starting the execution module by the PLC after the concentration of the pollutants reaches the set low limit value, automatically opening an electromagnetic valve 72 to enable the reaction solution to be discharged to a reagent collecting tank 403 through a reagent recovery pipeline 402, stopping the conveying the repairing agent to a spraying system 6 by the circulating water pump 71, and storing the repairing agent in a reagent regulating tank;
step three: in the reaction process, the information of soil organic matters and water quality is detected in real time through a data acquisition system of a PLC control system, the detection information is transmitted to the PLC controller through an A/D converter, the PLC controller controls an execution module according to the concentration detection information, the circulating water pump 71, the electromagnetic valve 72 and the working program of the spraying system 6 are controlled through a circulating multi-stage mode, the circulating water pump 71 intermittently and respectively transmits the surfactant-chelating agent enhanced advanced oxidation reagent to the soil filling chamber 3 and the electrochemical reaction chamber 4 through the spraying system 6 and the microbial agent, leaching oxidation of the organic matters and synergistic efficient degradation of microbial aerobe are carried out, and thorough decomposition and removal of the organic matters are realized.
The method can be used for ectopic or in-situ restoration of soil pollution, the pH regulator can be magnesium peroxide or calcium peroxide in alkaline oxide to prevent soil acidification, and the restored soil can be used as landscaping planting soil.
The utility model is further described below with reference to the accompanying drawings and examples:
the voltage of solar photovoltaic driven bioelectrochemical soil remediation is 2V, soil pollutants are organic chlorohydrocarbons, the concentration of the organic pollutants in the sampled and analyzed soil is 200mg/kg, a proper amount of microbial agent is adopted, and the concentration of essential nutrient element vitamins of microorganisms is 3.0ml/L.
As can be seen from fig. 3, example 1 is divided into 5 groups: (1) The spraying solution of the spraying system 6 is surfactant Tween80, and the mass fraction of the solution is 4% (wt.);
(2) The spraying solution of the spraying system 6 is mixed with an oxidant, the mass fraction of the solution is 4% (wt.), and the mole ratio of sodium persulfate to sodium citrate to ferrous sulfate to organic matters is 5:15:5:1;
(3) The spraying solution of the spraying system 6 is mixed with an oxidant, and the mass fraction of the solution is 4% (wt.), and the molar ratio of sodium persulfate to sodium citrate to ferrous sulfate to organic matters is 10:15:5:1;
(4) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in a molar ratio of 15:15:5:1;
(5) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in the molar ratio of 20:15:5:1, and the pH is regulated to 6-7 by using a pH regulator (1.0M/L).
Example 2
The groups are 3: (1) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in a molar ratio of 15:5:5:1;
(2) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in a molar ratio of 15:10:5:1;
(3) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in the molar ratio of 15:20:5:1, and the pH is regulated to 6-7 by using a pH regulator (1.0M/L).
Example 3
Divided into 2 groups: (1) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in a molar ratio of 15:15:10:1;
(2) The spraying solution of the spraying system 6 is mixed with oxidant, sodium persulfate, sodium citrate, ferrous sulfate and organic matters in a molar ratio of 15:15:15:1; the pH was adjusted to 6 to 7 using a pH adjuster (1.0M/L).
Example 4
In a small field test, adding a surfactant into the organic chlorohydrocarbon polluted soil, uniformly stirring, and curing for 1-2 days in a natural environment; adding a proper amount of sodium persulfate, sodium citrate, ferrous sulfate, zero-valent iron and peroxide, stirring uniformly, curing for 5-15 days in natural environment, adopting an organic matter sensor to detect the concentration of organic matters in soil, adding a proper amount of microbial agent into the soil to decompose residual organic pollutants when the residual concentration is stable, and taking the repaired soil as landscaping planting soil to plant arbor and shrub plants.
The utility model has the beneficial effects that: (1) The surfactant and the chelating agent are utilized to strengthen the coupling treatment technology of advanced oxidation and electrochemistry, and the surfactant releases adsorbed organic chlorohydrocarbon with strong binding force with soil particle colloid to increase the solubility; zero-valent iron and chelating agent sequesters Fe 2+ Continuous activation of persulfates to produce SO 4 · - Oxidative degradation of organochlorohydrocarbons to increase SO 4 · - Promotes the effective contact of the oxidant and the organic matters, and obviously improves the pollutant removal rate. (2) The electrode biomembrane is stimulated by solar photovoltaic direct current, so that the degradation of microorganisms to soil organic pollutants is enhanced, the migration of oxidizing solvents and microorganisms is promoted by the electric action, and the reaction rate is obviously improved. (3) The microbial agent continuously decomposes residual organic pollutants, so that the ectopic and in-situ restoration of soil pollutants is thoroughly realized, the soil acidification is avoided through alkaline peroxide, and the restored soil can be used as a landscaping seedPlanting soil.
Aiming at the defects of low efficiency, long time consumption, limited applicability and the like of the existing organic matter contaminated soil remediation technology, the utility model provides the advanced oxidation-electrochemical soil pollution remediation device and the advanced oxidation-electrochemical soil pollution remediation method based on PLC control by taking the solar photovoltaic system as the electric driving force, which are used for cooperatively coupling the solar photovoltaic system, the advanced oxidation-electrochemical and the microorganism contaminated soil remediation technology, so that the desorption and dissolution of the organic chlorohydrocarbon on the surface of soil particles are increased, the degradation and remediation efficiency of the organic chlorine contaminants in the soil can be remarkably improved, and the in-situ and ex-situ soil pollution remediation is realized.
The utility model realizes the automatic and intelligent operation control of the organic chlorine polluted soil restoration through the PLC control system, has the advantages of reasonable design, simple structure, convenient operation control, strong applicability and high efficiency of soil restoration, realizes the real-time monitoring and acquisition of soil information through the PLC controller, saves manpower, material resources and financial resources, can generate better economic benefit, environmental benefit and ecological benefit, and promotes the realization of the double carbon target.
The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.
Claims (6)
1. The utility model provides an electrochemistry soil pollution prosthetic devices based on PLC control, includes solar photovoltaic device (1), battery (2), soil filling room (3), electrochemical reaction room (4) and PLC automatic control system (7), its characterized in that: the solar photovoltaic device (1) comprises a solar photovoltaic panel (11) and a photovoltaic panel controller (12), wherein the solar photovoltaic panel (11) is connected with the storage battery (2) through the photovoltaic panel controller (12);
the upper part of the electrochemical reaction chamber (4) is provided with a soil filling chamber (3) through a supporting layer (5), a spraying system (6) is arranged above the soil filling chamber (3), the input end of the spraying system (6) is connected with an oxidizing agent conveying pipeline (601), a circulating water pump (71) and an electromagnetic valve (72) are arranged on the oxidizing agent conveying pipeline (601), the input end of the electrochemical reaction chamber (4) is provided with a microbial agent conveying pipeline (401), the microbial agent conveying pipeline (401) is also provided with a circulating water pump (71) and an electromagnetic valve (72), the output end of the electrochemical reaction chamber (4) is connected with a reagent recovery pipeline (402), the electromagnetic valve (72) is arranged on the reagent recovery pipeline (402), and one end of the reagent recovery pipeline (402) is connected with a reagent collecting tank (403);
a three-dimensional grid battery (41) is arranged in the electrochemical reaction chamber (4), an anode electrode (42) and a cathode electrode (43) are arranged in the three-dimensional grid battery (41), and nano zero-valent iron (44) is arranged on one side of the anode electrode (42);
the storage battery (2) is connected with an anode electrode (42) and a cathode electrode (43) in the electrochemical reaction chamber (4);
the execution module of the PLC automatic control system (7) comprises a circulating water pump (71), an electromagnetic valve (72) and a spraying system (6);
the soil filling chamber (3) is filled with polluted soil, the concentration of organic matters in the soil is not lower than 100mg/kg, and the soil filling chamber (3) is internally provided with a sampling pore canal baffle plate (31);
the sampling pore canal partition plate (31) consists of a first sampling unit (311), a second sampling unit (312) and a third sampling unit (313), wherein the first sampling unit (311), the second sampling unit (312) and the third sampling unit (313) are sequentially arranged and are in a ladder shape, and a conical guide head (314) is arranged at one side end part of the third sampling unit (313);
the first sampling unit (311), the second sampling unit (312) and the third sampling unit (313) are composed of sampling plates (315) and a supporting box (316);
the sampling plate (315) is arranged at the top of the supporting box (316), a sampling groove (3151) is formed in the plate surface of the sampling plate (315), and a sensor embedding groove (3152) is formed in a groove hole of the sampling groove (3151);
a supporting rib (317) is arranged in the supporting box (316), and a supporting cushion layer (318) is arranged at the upper part of the supporting rib (317); the upper surface of the support cushion layer (318) is attached to the lower surface of the sampling plate (315).
2. The PLC-controlled electrochemical soil pollution remediation device of claim 1, wherein: the solar photovoltaic device (1) provides green clean electric energy through solar power generation.
3. The PLC-controlled electrochemical soil pollution remediation device of claim 1, wherein: the reagent addition of the spraying system (6) and the electrochemical reaction chamber (4) is carried out by controlling a circulating water pump (71) and an electromagnetic valve (72) through a PLC automatic control system (7).
4. The PLC-controlled electrochemical soil pollution remediation device of claim 1, wherein: the anode electrode (42) of the three-dimensional grid battery (41) is made of a conductive metal organic framework material, iron or a porous carbon material, and nano zero-valent iron (44) is arranged at a position 5cm away from the anode; the cathode electrode (43) is a graphite rod, titanium or stainless steel net, and the voltage range for driving the bioelectrochemical soil restoration is 0-2V.
5. The PLC-controlled electrochemical soil pollution remediation device of claim 1, wherein: and a spraying system (6) is arranged above the soil filling chamber (3).
6. The PLC-controlled electrochemical soil pollution remediation device of claim 1, wherein: the electrochemical reaction chamber (4) is added with a proper amount of microbial agent and necessary nutrient elements through a microbial agent conveying pipeline (401), the necessary nutrient elements of the microorganisms are 0.8-5.5 ml/L, and the quantity and time of the solution additives are controlled through a working program set by a PLC controller of a PLC automatic control system (7).
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| CN115591924A (en) * | 2022-10-08 | 2023-01-13 | 中冶华天工程技术有限公司（Cn） | Electrochemical soil pollution remediation device and method based on PLC control |
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