CN108817076B - Method and system for enhanced restoration of petroleum-contaminated soil by using microbial electrochemical respirator - Google Patents
Method and system for enhanced restoration of petroleum-contaminated soil by using microbial electrochemical respirator Download PDFInfo
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- CN108817076B CN108817076B CN201810588384.1A CN201810588384A CN108817076B CN 108817076 B CN108817076 B CN 108817076B CN 201810588384 A CN201810588384 A CN 201810588384A CN 108817076 B CN108817076 B CN 108817076B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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Abstract
The invention discloses a method and a system for repairing petroleum-polluted soil by strengthening a microbial electrochemical respirator, wherein the system comprises a petroleum-polluted soil anaerobic reaction system, a petroleum-polluted soil aerobic reaction system and a microbial electrochemical respirator system, the microbial electrochemical respirator system comprises a microbial electrochemical respirator, the anode of the respirator is arranged in the anaerobic reaction system, the cathode is arranged in the aerobic reaction system, and a biological pile ventilation device and a biological nutrient drip filtration device are arranged in the aerobic reaction system; the anaerobic reaction system is provided with a material and nutrient substance feeding port, a sewage discharge port, a stirrer and a gas leading-out and activated sludge treatment device. The microorganism electrochemical respirator is coupled with the anaerobic reaction system and the aerobic reaction system for repairing. The invention can repair petroleum polluted soil with different water contents at the same time, can remove petroleum hydrocarbon with maximum efficiency, and has short treatment period, good repair effect, no secondary pollution and sustainable operation.
Description
Technical Field
The invention relates to the technical field of polluted soil restoration, in particular to a method and a system for enhanced restoration of petroleum polluted soil by a microbial electrochemical respirator.
Background
With the prosperity and development of the social economy in China, the petroleum resources are deeply utilized, so that the development of petroleum exploitation industry is promoted. However, because of the management and technical drawbacks of petroleum in the utilization process, a large amount of crude oil directly or briefly flows into the soil, resulting in serious pollution of a large area of soil. The petroleum fills the gaps of the soil to influence the permeability of the soil, and also seriously damage the three-phase structure of water, gas and solid of the soil of crude oil, influence the growth of soil microorganisms, the respiration of plant roots in the soil and the absorption of nutrients and moisture, so that the plant roots are rotted and necrotized, and the growth of plants is seriously endangered. Meanwhile, the petroleum in the soil is continuously migrated and diffused along with the moisture in the soil, so that the underground water is polluted.
Current techniques for contaminated soil remediation can be broadly divided into three categories, namely physical, chemical and biological. The first two methods have limited repairing effect, high cost and easy secondary pollution, and the third method does not generate similar problems. The heat treatment process is a physical process commonly used for treating petroleum contaminated soil. Because the types of the petroleum-polluted soil are more, the water contents of the excavated petroleum-polluted soil are different, and the petroleum-polluted soil with extremely high water content exists. The chemical method treatment is very easy to cause secondary pollution, and the biological method treatment is only suitable for repairing the soil polluted by the petroleum with lower concentration and has long repairing period.
The natural restoration process of the petroleum-polluted soil has long period and low efficiency, so that in order to reduce the harm of petroleum soil pollution, developed countries have made related soil restoration plans at present, explore effective restoration technologies, and how to restore the petroleum-polluted soil with high efficiency, safety and low cost has become one of important subjects in the environmental field.
Compared with other restoration technologies, the microbial fuel cell (microbial fuel cells, MFCs) is a technology for directly converting chemical energy into electric energy by utilizing electricity-generating microorganisms, does not consume external energy and has no secondary pollution during operation, and has great potential in the aspects of electricity generation, polluted soil restoration, greenhouse gas emission reduction, pollution toxicity detection and the like. The current research on the electricity generation performance of the MFCs at home and abroad is slow, and compared with the electricity generation capacity, the method is easier to realize by utilizing the characteristic of degrading organic matters to treat pollutants. The performance of MFCs is characterized by a power/current curve obtained by varying the resistances of the external circuit. Very high resistance or open circuit, voltage is highest, but current is zero resulting in zero power. Decreasing the resistance results in a voltage drop and then increasing the current results in a bell-shaped curve. MFCs provide maximum current when the resistance is small, or when the cell is shorted, because no voltage causes the power to decrease to zero. In terms of energy generation, the optimal power point for MFCs is the point at which power is greatest. While for the purpose of optimizing pollutant remediation, the optimal operating point is that the shorted MFC provides the maximum current at the time of the short circuit, which means that the highest oxidation rate of the organics is guaranteed. Microbial electrochemical respirators (microbial electrochemical snorkel, MES) are a novel MFCs for short circuits. MES cannot supply current, but rather the current generated by degrading organic contaminants is utilized in situ in the optimized treatment of the contaminants to maximize the oxidation of the organic material, and the system does not need to contain membranes or any other type of separator. MES does not produce secondary pollution or malodor during pollutant treatment, is a clean energy technology and is a green technology for pollutant remediation. Therefore, the MES is applied to repairing the petroleum-polluted soil, so that the repairing process can be accelerated, and the repairing effect can be improved.
However, no report is available on the combination of the microorganism electrochemical breather with the anaerobic reaction system of the petroleum-polluted soil and the aerobic reaction system of the petroleum-polluted soil for strengthening and repairing the petroleum-polluted soil.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for reinforcing and repairing petroleum-polluted soil by using a microbial electrochemical respirator, wherein the system can treat petroleum-polluted soil with different water contents simultaneously, can fully utilize oxygen which is not utilized by microorganisms in the ventilation process to effectively reduce energy consumption, does not generate secondary pollution, is green and clean, and is sustainable.
The invention solves the technical problems with the following technical proposal:
the invention relates to a method for reinforcing and repairing petroleum-polluted soil by using a microbial electrochemical respirator, which comprises the following operation steps:
1) The method comprises the steps of constructing a reaction system, wherein the reaction system comprises an oil-contaminated soil anaerobic reaction system, an oil-contaminated soil aerobic reaction system and a microbial electrochemical respirator system, the oil-contaminated soil anaerobic reaction system and the oil-contaminated soil aerobic reaction system are adjacently arranged, the microbial electrochemical respirator system comprises a microbial electrochemical respirator, an anode of the microbial electrochemical respirator is arranged in the oil-contaminated soil anaerobic reaction system, a cathode of the microbial electrochemical respirator is arranged in the oil-contaminated soil aerobic reaction system, and a biological pile ventilation device and a biological nutrient drip filtration device are arranged in the oil-contaminated soil aerobic reaction system; the petroleum polluted soil anaerobic reaction system is provided with a material and nutrient substance feeding port, a sewage discharge port, a stirrer and a gas leading-out and activated sludge treatment device;
2) Pre-treating petroleum-polluted soil, respectively adjusting the PH value of the petroleum-polluted soil with low water content and high water content to be neutral, and adjusting the C, N, P, K proportion in the soil to be 90-100:9-12:1:1;
3) Piling the pretreated polluted soil with low water content into the petroleum polluted soil aerobic reaction system of the step 1, and piling the pretreated polluted soil with high water content into the petroleum polluted soil anaerobic reaction system of the step 1; the microbial electrochemical breather in the microbial electrochemical breather system is started, and the microbial electrochemical breather is coupled with the anaerobic reaction system of the oil polluted soil to repair, so that the petroleum hydrocarbon degrading bacteria are ensured to be in a range of 6.5 multiplied by 10 8 cfu/kg～7.5×10 8 cfu/kg, and simultaneously repairing the petroleum polluted soil by coupling an aerobic reaction system of a microorganism electrochemical respirator, controlling the oxygen content of the soil to be 25% -30%, and ensuring that petroleum hydrocarbon degrading bacteria are 8.5 multiplied by 10 8 cfu/kg～9.5×10 8 cfu/kg；
4) Monitoring the soil remediation result:
performing spot check on activated sludge at different positions in the anaerobic reaction system of petroleum polluted soil every 5 days, performing gas-liquid separation treatment on the activated sludge when the activated sludge is qualified, backfilling soil, and storing the generated biogas slurry for producing organic fertilizer;
sampling different positions of a biological pile in the petroleum polluted soil aerobic reaction system every 5 days, measuring petroleum hydrocarbon content at the same sampling position every time, and carrying out soil pile cleaning and backfilling after the detection is qualified.
In the step 2), the water content of the petroleum polluted soil with low water content is less than 35%, the petroleum polluted soil is treated by a crusher and a screening machine, massive soil is crushed to a particle size of less than 2.5cm, stones and other sundries are screened out, the screened soil is mixed with crop straws, the screened soil is mixed with the crop straws, the porosity of the soil reaches 50-60%, and the soil moisture is regulated to ensure that the soil water content is within a range of 20-35%;
the water content of the petroleum polluted soil with high water content is more than 60%, and the petroleum polluted soil is stirred into a fluid state after stones and other impurities are removed.
In the step 2), the proportion of C, N, P, K in the petroleum polluted soil with low water content is regulated to be 90-100:9-12:1:1 by adding urea, superphosphate, monoamine phosphate and potassium chloride; the proportion of C, N, P, K in the petroleum polluted soil with high water content is adjusted to be 90-100:9-12:1:1 by adding peanut cake, superphosphate, monoamine phosphate and potassium chloride.
The invention relates to a system for strengthening and repairing petroleum-polluted soil by using a microbial electrochemical breather, which mainly comprises a petroleum-polluted soil anaerobic reaction system, a petroleum-polluted soil aerobic reaction system and a microbial electrochemical breather system, wherein the petroleum-polluted soil anaerobic reaction system and the petroleum-polluted soil aerobic reaction system are respectively provided with reaction tanks, are adjacently arranged, a partition wall is arranged between the two reaction tanks, a material and nutrient feeding port and a sludge discharge port are arranged above the reaction tanks of the petroleum-polluted soil anaerobic reaction system, a plurality of groups of stirrers are arranged in the reaction tanks, the reaction tanks are connected with gas guiding and activated sludge treatment equipment, and pressure, temperature and gas on-line monitoring equipment is arranged in the petroleum-polluted soil anaerobic reaction system; the petroleum polluted soil aerobic reaction system comprises biological nutrient trickling filtration equipment, biological pile ventilation equipment and gas and temperature and humidity on-line monitoring equipment, wherein the biological pile ventilation equipment is provided with a circulating pipeline, and the biological nutrient trickling filtration equipment is connected with the circulating pipeline for ventilation of the biological pile; the microbial electrochemical respirator system comprises a microbial electrochemical respirator, wherein an anode of the microbial electrochemical respirator is arranged in a reaction tank of the anaerobic reaction system of the petroleum polluted soil, and a cathode of the microbial electrochemical respirator is arranged in a reaction tank of the aerobic reaction system of the petroleum polluted soil;
the microorganism electrochemical respirator is provided with a plurality of groups of stainless steel nets, the periphery of each stainless steel net is fixed by a PVC plate, and the bottom of each stainless steel net is supported by a foot rest; the partition wall is provided with a microbial electrochemical respirator connector, and the stainless steel mesh passes through the microbial electrochemical respirator connector to be connected with the petroleum polluted soil aerobic reaction system and the petroleum polluted soil anaerobic reaction system.
The biological pile ventilation equipment comprises a ventilation main pipe, a ventilation branch pipe and a blower, wherein the ventilation main pipe is in a snake shape and is uniformly paved on the upper part of a biological pile in the petroleum polluted soil aerobic reaction system and is connected with the blower to form a circulating pipeline; the ventilation branch pipes are arranged perpendicular to the ventilation main pipe and are connected into the ventilation main pipe through the flower-shaped connecting pipes, and a plurality of air holes are arranged on the ventilation branch pipes.
The stirrer of the petroleum polluted soil anaerobic reaction system is a double-screw stirrer which is connected with an external engine; the pressure, temperature and gas on-line monitoring equipment comprises a pressure probe, a temperature probe and a gas probe, wherein the three probes are buried in activated sludge in the reaction tank and share one sensing line to be connected with an external detector; the stirrer of the petroleum polluted soil anaerobic reaction system is a double-screw stirrer which is connected with an external engine; the pressure, temperature and gas on-line monitoring equipment comprises a pressure probe, a temperature probe and a gas probe, wherein the three probes are buried in activated sludge in the reaction tank and share one sensing line to be connected with an external detector; the gas guiding-out and activated sludge treatment equipment comprises a gas guiding-out pipe, a gas-liquid separator, an activated carbon adsorbent storage tank and a biogas slurry storage tank, wherein the gas guiding-out pipe is connected with the activated carbon adsorbent storage tank, the inlet of the gas-liquid separator is connected with a sludge discharge port, the gas outlet of the gas-liquid separator is connected with the activated carbon adsorbent storage tank, and the liquid outlet of the gas-liquid separator is connected with the biogas slurry storage tank; the material and nutrient substance feeding port is connected with the anaerobic reaction nutrient solution storage tank through a feeding pump.
The on-line monitoring equipment for the gas and the temperature and the humidity of the petroleum polluted soil aerobic reaction system comprises a plurality of probes which are uniformly paved in the sludge, and the probes are connected to an external detector.
The biological nutrient drip filtration equipment of the petroleum polluted soil aerobic reaction system comprises an aerobic reaction nutrient solution storage tank and a feeding pump, wherein an input port of the feeding pump is connected with the aerobic reaction nutrient solution storage tank, and an output port of the feeding pump is connected with a circulating pipeline of the biological reactor ventilation equipment so as to form circulating transportation.
Compared with the prior art, the invention has the following advantages:
(1) The invention can couple the biological ventilation aerobic treatment and the anaerobic treatment of the petroleum-polluted soil by utilizing the microbial breather to perform the optimal combination, can simultaneously treat the petroleum-polluted soil with extremely high water content and the petroleum-polluted soil with relatively low water content, fully utilizes energy sources and can save cost.
(2) In the biological ventilation treatment process of the petroleum-polluted soil with relatively low water content, oxygen which cannot be fully utilized by microorganisms in the ventilation process can be used as an electrode receptor to be provided for a cathode of a microbial breather (MES), so that energy can be saved, and the microbial electro-chemical breather (MES) can be utilized to strengthen bioremediation of the petroleum-polluted soil.
(3) The microbial electrochemical respirator (MES) is used as a novel Microbial Fuel Cell (MFCs) with short circuit, and the anode is arranged in an anaerobic reaction treatment system of petroleum polluted soil with extremely high water content, so that the microbial electrochemical respirator has the advantage of maximized oxidation of organic matters, and can efficiently remove petroleum hydrocarbon.
(4) The system has the advantages of short treatment period, good repairing effect, no secondary pollution, and the liquid separated from the treated petroleum hydrocarbon activated sludge can be further used for producing organic fertilizers, and is green, clean and sustainable.
Drawings
FIG. 1 is a schematic structural diagram of a system for enhanced remediation of petroleum-contaminated soil by a microbial-electro-chemical respirator of the present invention.
FIG. 2 is a schematic illustration of the mounting structure of the microbial electrochemical respirator system of FIG. 1.
FIG. 3 is a schematic diagram of the anaerobic reaction system for the petroleum contaminated soil in FIG. 1.
FIG. 4 is a schematic diagram of the aerobic reaction system of the petroleum contaminated soil in FIG. 1.
In the figure: 1. an anaerobic reaction system for petroleum polluted soil; 2. an oil polluted soil aerobic reaction system; 3. a microbial electrochemical respirator system; 4. a foot rest; 5. a microbial electrochemical respirator connection port; 6. a stop valve; 7. adding a pump; 8. an exhaust fan; 9. a centrifugal pump; 10. a flow meter; 11. a blower; 12. a gas-liquid separator; 13. an activated carbon adsorbent storage tank; 14. a biogas slurry storage tank; 15. an anaerobic reaction nutrient solution storage tank; 16. an aerobic reaction nutrient solution storage tank; 17. pressure, temperature and gas on-line monitoring equipment; 18. a material and nutrient substance feeding port; 19. a probe; 20. a double helix stirrer; 21. an engine; 22. a flower-shaped connecting pipe; 23. a gas and temperature and humidity monitoring device; 24. a probe; 25. a ventilation branch pipe; 26. an air hole; 27. partition walls; 28. a gas delivery tube; 29. a bleed valve; 30. a ventilation main pipe; 31. a sludge discharge port; 32. microbial electrochemical respirators.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the system for reinforcing and repairing petroleum-polluted soil by using the microbial electrochemical respirator mainly comprises a microbial electrochemical respirator system 3, a petroleum-polluted soil anaerobic reaction system 1 and a petroleum-polluted soil aerobic reaction system 2, wherein the petroleum-polluted soil anaerobic reaction system 1 and the petroleum-polluted soil aerobic reaction system 2 are respectively provided with reaction tanks, are adjacently arranged, a partition wall 27 is arranged between the two reaction tanks, and a microbial electrochemical respirator connecting port 5 is arranged on the partition wall 27.
As shown in fig. 2, the microbial electrochemical respirator system 3 comprises a microbial electrochemical respirator 32, wherein an anode of the microbial electrochemical respirator 32 is arranged in a reaction tank of the oil-polluted soil anaerobic reaction system 1, and a cathode of the microbial electrochemical respirator 32 is arranged in a reaction tank of the oil-polluted soil aerobic reaction system 2; the microorganism electrochemical respirator 32 is a plurality of groups of stainless steel nets, the periphery of each stainless steel net is fixed by a PVC plate, and the bottom of each stainless steel net is supported by a foot rest 4; the stainless steel net 32 passes through the connecting port 5 of the microorganism electrochemical respirator to connect the petroleum polluted soil aerobic reaction system and the petroleum polluted soil anaerobic reaction system.
As shown in fig. 3, a material and nutrient adding port 18 and a sludge discharging port 31 are arranged above a reaction tank of the petroleum polluted soil anaerobic reaction system 1, a plurality of groups of double spiral stirrers 20 are arranged in the reaction tank, the double spiral stirrers 20 are connected with an external engine 21, the reaction tank of the petroleum polluted soil anaerobic reaction system 1 is connected with a gas guiding-out and activated sludge treatment device, the gas guiding-out and activated sludge treatment device comprises a gas guiding-out pipe 28, a gas-liquid separator 12, an activated carbon adsorbent storage tank 13 and a biogas slurry storage tank 14, the gas guiding-out pipe 28 is connected with the activated carbon adsorbent storage tank 13, a gas discharging pipe 28 is provided with a gas discharging valve 29, a stop valve 6 and a flowmeter 10, an inlet of the gas-liquid separator 12 is connected with the sludge discharging port 31 through a pipeline, the pipeline is provided with the stop valve 6, a gas outlet of the gas-liquid separator 12 is connected with the activated carbon adsorbent storage tank 13 through a pipeline, the pipeline is provided with an exhaust fan 8, the stop valve 6 and the flowmeter 10, a liquid outlet of the gas-liquid separator 12 is connected with the biogas storage tank 14 through a pipeline, the pipeline is provided with a centrifugal pump 9, the gas discharging valve 6 and the nutrient adding port 7 and the flowmeter 10 are connected with the material adding port 10 through the gas discharging valve 6 and the stop valve 10; the reaction tank of the anaerobic reaction system 1 for petroleum polluted soil is connected with an on-line monitoring device 17 for pressure, temperature and gas, the monitoring device 17 comprises a plurality of probes 19, wherein the pressure probes, the temperature probes and the gas probes are buried in activated sludge in the reaction tank, and the probes share one sensing line and are connected with an external detector.
As shown in fig. 4, the petroleum contaminated soil aerobic reaction system 2 comprises a biological nutrient drip filtration device, a biological reactor ventilation device and a gas and temperature and humidity on-line monitoring device 23, wherein the biological reactor ventilation device comprises a ventilation main pipe 30, a ventilation branch pipe 25 and a blower 11, and the ventilation main pipe 30 is uniformly laid at the upper part of a biological reactor in a reaction tank of the petroleum contaminated soil aerobic reaction system 2 in a serpentine shape and is connected with the blower 11 to form a circulation pipeline; the ventilation branch pipes 25 are arranged perpendicular to the ventilation main pipe 30 and are connected with the ventilation main pipe 30 through the flower-shaped connecting pipes 22, and a plurality of air holes 26 are arranged on the ventilation branch pipes 25; the on-line monitoring equipment 23 for gas and temperature and humidity comprises a plurality of probes 24 which are uniformly laid in the sludge in the reaction tank, the probes are connected to an external detector, and each probe comprises a temperature probe, a temperature probe and a gas probe; the biological nutrient drip filtration equipment comprises an aerobic reaction nutrient solution storage tank 16 and a dosing pump 7, wherein an input port of the dosing pump 7 is connected with the aerobic reaction nutrient solution storage tank 16, an output port of the dosing pump 7 is communicated with a circulating pipeline of the biological reactor ventilation equipment through a pipeline to form circulating transportation, and a stop valve 6 and a flowmeter 10 are arranged on the pipeline.
The reaction tank material of the system in the embodiment is made of red bricks, broken stones, sand and silicate cement, and a layer of impermeable geomembrane is paved at the bottom. The ring beam and the tank cover of the anaerobic reaction tank are made of No. 200 concrete. The bottom of the anaerobic reaction tank and the bottom of the aerobic reaction tank are made of No. 100 concrete, and the wall of the anaerobic reaction tank and the aerobic reaction tank are made of No. 150 concrete. The strength of the cement mortar is generally not lower than 75 # and the strength of the pointing mortar is not lower than 100 #. The bottom dimension of the whole system is 34m long by 24m wide and the height is 2.5m. Wherein the anaerobic reaction tank is 17m long by 12m wide and 2.5m high; the length of the aerobic reaction tank is 17m multiplied by the width of the aerobic reaction tank is 12m, and the height of the aerobic reaction tank is 2.5m.
The microbial electrochemical respirator system 3 is provided with 3-6 groups of microbial electrochemical respirators 32, and the size is 12m multiplied by 1.5m. Each microbial electrochemical respirator 3 is supported by 4-6 foot rests 4 and placed vertically in the system at a distance of 0.5m from the bottom. The anode of the microorganism electrochemical breather 32 is arranged in the anaerobic reaction system 1 for treating the petroleum-polluted soil with extremely high water content, the cathode is arranged in the aerobic reaction system 2 for treating the petroleum-polluted soil with relatively low water content, the microorganism electrochemical breather 32 passes through the partition wall 27, and the anaerobic and aerobic treatments of the petroleum-polluted soil with different water contents are simultaneously enhanced through the microorganism electrochemical breather 32.
When petroleum polluted soil with higher water content (the water content is more than 60 percent) is treated, the material is pretreated and then is added into the petroleum polluted soil anaerobic reaction system 1 through the material and nutrient substance adding port 18, and the nutrient solution in the anaerobic reaction nutrient solution storage tank 15 is added into the anaerobic system through the adding pump 7. The nutrient solution is peanut cake, superphosphate, monoamine phosphate and potassium chloride, so as to adjust the proportion of carbon, nitrogen, phosphorus and potassium in the soil to be 90-100:9-12:1:1, and the pH value is adjusted to be neutral. The number of agitators of the anaerobic system is 3-6 groups each disposed between two microbial electrochemical respirators 32 and powered by an external motor 21. The pressure probe, temperature probe and gas probe of the pressure, temperature and gas on-line monitoring device 17 are buried in the petroleum activated sludge, share one sensing line and are connected with an external detector, and can exhaust gas through the air release valve 29 and the gas delivery pipe 28 when the pressure is excessive, and purify the released gas through the activated carbon adsorption tank 13. The treated activated sludge is extracted by an exhaust fan 8 and a centrifugal pump 9, after being treated by a gas-liquid separator 12, the gas is treated by tail gas through an activated carbon adsorption tank 13 and discharged into the atmosphere after reaching standards, the activated sludge is centrifugally separated by the centrifugal pump 9 to obtain biogas slurry and soil, and the biogas slurry enters a biogas slurry storage tank 14 to be stored for producing organic fertilizer after reaching standards after being detected, and the soil is backfilled.
When petroleum-polluted soil with low water content (the water content is less than 35%) is treated, the materials are piled in the petroleum-polluted soil aerobic reaction system 2. The inside diameter of a ventilation main pipe 30 in the petroleum polluted soil aerobic reaction system 2 is 10cm, the distance from the top of a soil pile body to the ventilation main pipe is 0.2m, the inside diameter of ventilation branch pipes 25 is 8cm, the distance from each ventilation branch pipe to the bottom of the soil pile is 2m, the ventilation branch pipes are made of PVC materials, and a plurality of air holes 26 are distributed on the ventilation branch pipes 25. The biological nutrient substance drip filtration device is connected with the circulating pipeline of the biological pile ventilation device to form circulating conveying biological nutrient substances. The nutrient substances adopted by the petroleum polluted soil aerobic reaction system 2 are urea, superphosphate, monoamine phosphate and potassium chloride, so as to adjust the proportion of carbon, nitrogen, phosphorus and potassium in the soil to be 90-100:9-12:1:1, and adjust the pH value to be neutral. The petroleum polluted soil aerobic reaction system 2 is provided with 9 gas and temperature and humidity probes, is uniformly arranged in the middle of the soil pile body, is connected with a detector outside the soil pile body through an induction line, and monitors the dynamic change of the biological pile in real time so as to regulate and control the nutrient substances of the biological pile through biological nutrient substance drip filtration equipment in time.
The invention relates to ectopic soil remediation, which is characterized in that polluted soil is dredged and enters the system for treatment after a certain pretreatment. The treated contaminated soil is classified into petroleum contaminated soil having an extremely high water content and petroleum contaminated soil having a relatively low water content.
The polluted soil with relatively low water content is treated by a crusher and a sieving machine, the massive soil is crushed to a particle size smaller than 2.5cm, and stones and other impurities are sieved and treated independently. Mixing the sieved soil with crop straw to make the porosity reach 50% -60%, and finally feeding the mixture into an oil polluted soil aerobic reaction system 2 in the system.
The petroleum polluted soil with extremely high water content is screened, sundries and stones are removed, and then piled into the petroleum polluted soil anaerobic reaction system 1 of the system, and the water content is regulated, so that the petroleum activated sludge is in a fluid state capable of being stirred.
The following are examples of applications of the present invention:
step 1, constructing a reaction system:
the reaction tank material of the system is made of red bricks, broken stones, sand and silicate cement, and a layer of impermeable geomembrane is paved at the bottom. The ring beam and the tank cover of the anaerobic reaction tank are made of No. 200 concrete. The bottom of the anaerobic reaction tank and the bottom of the aerobic reaction tank are made of No. 100 concrete, and the wall of the anaerobic reaction tank and the bottom of the aerobic reaction tank are made of No. 150 concrete. The strength of the cement mortar is generally not lower than 75 # and the strength of the pointing mortar is not lower than 100 #. The overall system bottom dimensions were 34m long by 24m wide and 2.5m high. Wherein the anaerobic reaction system of the petroleum polluted soil is 17m long by 12m wide and 2.5m high; the petroleum polluted soil aerobic reaction system is 17m long by 12m wide and 2.5m high. 6 groups of microorganism electrochemical respirators, 5 groups of stirrers and 1 set of pressure, temperature and gas on-line monitoring equipment 17 are paved in the anaerobic reaction system of the petroleum polluted soil; the on-line detection equipment 23 and 48 and biological nutrient drip filtration equipment which are connected with a ventilation main pipe (6 times 8 ventilation branch pipes are separated by 2 m) and the ventilation branch pipes are uniformly paved in the anaerobic reaction system of the petroleum polluted soil.
the polluted soil is taken from an oilfield polluted area, is excavated by using an excavating machine aiming at the polluted soil with relatively low water content, and is crushed and screened to remove large rocks, plant roots and other sundries in the polluted soil. And (3) simultaneously detecting and adjusting the pH value in the screening process, and adjusting the pH value of the soil to be neutral. Crop root systems and straws with the grain diameter of about 4mm are added into polluted soil to enable the porosity of the mixed soil to reach 50% -60%, urea, superphosphate, monoamine phosphate and potassium chloride are added to adjust the proportion of C, N, P, K in the soil to be 100:10:1:1, the moisture content of the soil to be 20% -35%, and the mixed soil is stirred and mixed uniformly. And (3) adding the pretreated polluted soil into the petroleum polluted soil aerobic reaction system 2 in the system.
The polluted soil is taken from an oilfield polluted area, the polluted soil with extremely high water content is subjected to cleaning and screening treatment, sundries and stones are removed, then the pH of the soil is adjusted to be neutral, and peanut cakes, calcium superphosphate, monoamine phosphate and potassium chloride are added at the same time, so that the C, N, P, K proportion in the soil is adjusted to be 95:12:1:1. And then fed into the petroleum contaminated soil anaerobic reaction system 1 of the system of the present invention.
petroleum hydrocarbon is recovered by coupling a microorganism electrochemical respirator with an anaerobic reaction system of petroleum polluted soil: starting an on-line monitoring device in an anaerobic reaction system, regulating the rotating speed of a stirrer to 100r/min, running for 3 hours, stirring for 4 times per day to ensure that petroleum hydrocarbon sludge and nutrient solution are uniformly mixed, so that anaerobic microorganisms fully degrade petroleum hydrocarbon pollutants, detecting the number of viable microorganisms at regular time, and ensuring that degrading petroleum hydrocarbon degrading bacteria are in a range of 6.5 multiplied by 10 8 cfu/kg～7.5×10 8 cfu/kg。
Repairing petroleum hydrocarbon by coupling a microorganism electrochemical respirator with an aerobic reaction system of petroleum polluted soil: ventilating for 6 times a day, wherein the synchronization time is 2.5 hours each time, determining the change of the microorganism growth environment by an on-line monitoring device, continuously adjusting the growth environment factors, maintaining the microorganism growth and metabolism environment, detecting the viable count of the microorganism at regular time, and ensuring that the petroleum hydrocarbon degrading bacteria is 8.5x10 8 cfu/kg～9.5×10 8 cfu/kg, and controlling the oxygen content of soil to be 25% -30%.
Step 4, detecting the petroleum hydrocarbon contaminated soil restoration result:
and (3) performing spot check on the activated sludge at different positions in the anaerobic reaction system of the petroleum polluted soil every 5 days, wherein after the reaction is carried out for 45 days, the petroleum hydrocarbon removal rate reaches more than 90%, the activated sludge is qualified, the activated sludge is treated, the soil is backfilled, and the biogas slurry is stored for producing the organic fertilizer.
Sampling different positions of a biological pile in an aerobic reaction system of petroleum polluted soil every 5 days, measuring petroleum hydrocarbon content every time the sampling positions are the same, and after 40 days of biological pile reaction, removing petroleum hydrocarbon to be more than 91%, after treatment, checking to be qualified, and then transporting and backfilling the soil pile.
Claims (9)
1. The method for reinforcing and repairing petroleum-polluted soil by using the microbial electrochemical respirator is characterized by comprising the following steps of: the method comprises the following operation steps:
1) The method comprises the steps of constructing a reaction system, wherein the reaction system comprises an oil-contaminated soil anaerobic reaction system, an oil-contaminated soil aerobic reaction system and a microbial electrochemical respirator system, the oil-contaminated soil anaerobic reaction system and the oil-contaminated soil aerobic reaction system are adjacently arranged, the microbial electrochemical respirator system comprises a microbial electrochemical respirator, an anode of the microbial electrochemical respirator is arranged in the oil-contaminated soil anaerobic reaction system, a cathode of the microbial electrochemical respirator is arranged in the oil-contaminated soil aerobic reaction system, and a biological pile ventilation device and a biological nutrient drip filtration device are arranged in the oil-contaminated soil aerobic reaction system; the petroleum polluted soil anaerobic reaction system is provided with a material and nutrient substance feeding port, a sewage discharge port, a stirrer and a gas leading-out and activated sludge treatment device;
2) Pre-treating petroleum-polluted soil, respectively adjusting the PH value of the petroleum-polluted soil with low water content and high water content to be neutral, and adjusting the C, N, P, K proportion in the soil to be 90-100:9-12:1:1;
3) Piling the pretreated polluted soil with low water content into the petroleum polluted soil aerobic reaction system of the step 1, and piling the pretreated polluted soil with high water content into the petroleum polluted soil anaerobic reaction system of the step 1; the microbial electrochemical breather in the microbial electrochemical breather system is started, and the microbial electrochemical breather is coupled with the anaerobic reaction system of the oil polluted soil to repair, so that the petroleum hydrocarbon degrading bacteria are ensured to be in a range of 6.5 multiplied by 10 8 cfu/kg～7.5×10 8 cfu/kg, and simultaneously repairing the petroleum polluted soil by coupling an aerobic reaction system of a microorganism electrochemical respirator, controlling the oxygen content of the soil to be 25% -30%, and ensuring that petroleum hydrocarbon degrading bacteria are 8.5 multiplied by 10 8 cfu/kg～9.5×10 8 cfu/kg；
4) Monitoring the soil remediation result:
performing spot check on activated sludge at different positions in the anaerobic reaction system of petroleum polluted soil every 5 days, performing gas-liquid separation treatment on the activated sludge when the activated sludge is qualified, backfilling soil, and storing the generated biogas slurry for producing organic fertilizer;
sampling different positions of a biological pile in the petroleum polluted soil aerobic reaction system every 5 days, measuring petroleum hydrocarbon content at the same sampling position every time, and carrying out soil pile cleaning and backfilling after the detection is qualified.
2. The method for enhanced remediation of petroleum-contaminated soil by a microbial electro-chemical respirator of claim 1, wherein: in the step 2), the water content of the petroleum polluted soil with low water content is less than 35%, the petroleum polluted soil is treated by a crusher and a screening machine, massive soil is crushed to a particle size of less than 2.5cm, stones and other sundries are screened out, the screened soil is mixed with crop straws, the porosity of the soil reaches 50-60%, and the water content of the soil is regulated to be within a range of 20-35%;
the water content of the petroleum polluted soil with high water content is more than 60%, and the petroleum polluted soil is stirred into a fluid state after stones and other impurities are removed.
3. The method for enhanced remediation of petroleum-contaminated soil by a microbial electro-chemical respirator according to claim 1 or 2, wherein: in the step 2), the proportion of C, N, P, K in the petroleum polluted soil with low water content is regulated to be 90-100:9-12:1:1 by adding urea, superphosphate, monoamine phosphate and potassium chloride; the proportion of C, N, P, K in the petroleum polluted soil with high water content is adjusted to be 90-100:9-12:1:1 by adding peanut cake, superphosphate, monoamine phosphate and potassium chloride.
4. The system for reinforcing and repairing petroleum-polluted soil by using the microorganism electrochemical respirator is characterized in that: the system mainly comprises an oil-contaminated soil anaerobic reaction system, an oil-contaminated soil aerobic reaction system and a microbial electrochemical respirator system, wherein the oil-contaminated soil anaerobic reaction system and the oil-contaminated soil aerobic reaction system are respectively provided with reaction tanks and are adjacently arranged, a partition wall is arranged between the two reaction tanks, a material and nutrient substance feeding port and a sludge discharge port are arranged above the reaction tanks of the oil-contaminated soil anaerobic reaction system, a plurality of groups of stirrers are arranged in the reaction tanks, the reaction tanks are connected with gas guiding-out and activated sludge treatment equipment, and pressure, temperature and gas on-line monitoring equipment is arranged in the oil-contaminated soil anaerobic reaction system; the petroleum polluted soil aerobic reaction system comprises biological nutrient trickling filtration equipment, biological pile ventilation equipment and gas and temperature and humidity on-line monitoring equipment, wherein the biological pile ventilation equipment is provided with a circulating pipeline, and the biological nutrient trickling filtration equipment is connected with the circulating pipeline for ventilation of the biological pile; the microbial electrochemical respirator system comprises a microbial electrochemical respirator, wherein an anode of the microbial electrochemical respirator is arranged in a reaction tank of the oil-polluted soil anaerobic reaction system, and a cathode of the microbial electrochemical respirator is arranged in a reaction tank of the oil-polluted soil aerobic reaction system;
5. the system for enhanced remediation of petroleum-contaminated soil by microbial-electro-chemical respirators of claim 4, wherein: the microorganism electrochemical respirator is provided with a plurality of groups of stainless steel nets, the periphery of each stainless steel net is fixed by a PVC plate, and the bottom of each stainless steel net is supported by a foot rest; the partition wall is provided with a microbial electrochemical respirator connector, and the stainless steel mesh passes through the microbial electrochemical respirator connector to be connected with the petroleum polluted soil aerobic reaction system and the petroleum polluted soil anaerobic reaction system.
6. The system for enhanced remediation of petroleum-contaminated soil by microbial-electro-chemical respirators of claim 4 or 5, wherein: the biological pile ventilation equipment comprises a ventilation main pipe, a ventilation branch pipe and a blower, wherein the ventilation main pipe is in a snake shape and is uniformly paved on the upper part of a biological pile in the petroleum polluted soil aerobic reaction system and is connected with the blower to form a circulating pipeline; the ventilation branch pipes are arranged perpendicular to the ventilation main pipe and are connected into the ventilation main pipe through the flower-shaped connecting pipes, and a plurality of air holes are arranged on the ventilation branch pipes.
7. The system for enhanced remediation of petroleum-contaminated soil by microbial-electro-chemical respirators of claim 4 or 5, wherein: the stirrer of the petroleum polluted soil anaerobic reaction system is a double-screw stirrer which is connected with an external engine; the pressure, temperature and gas on-line monitoring equipment comprises a pressure probe, a temperature probe and a gas probe, wherein the three probes are buried in activated sludge in the reaction tank and share one sensing line to be connected with an external detector; the gas guiding-out and activated sludge treatment equipment comprises a gas guiding-out pipe, a gas-liquid separator, an activated carbon adsorbent storage tank and a biogas slurry storage tank, wherein the gas guiding-out pipe is connected with the activated carbon adsorbent storage tank, the inlet of the gas-liquid separator is connected with a sludge discharge port, the gas outlet of the gas-liquid separator is connected with the activated carbon adsorbent storage tank, and the liquid outlet of the gas-liquid separator is connected with the biogas slurry storage tank; the material and nutrient substance feeding port is connected with the anaerobic reaction nutrient solution storage tank through a feeding pump.
8. The system for enhanced remediation of petroleum-contaminated soil by microbial-electro-chemical respirators of claim 4 or 5, wherein: the on-line monitoring equipment for the gas and the temperature and the humidity of the petroleum polluted soil aerobic reaction system comprises a plurality of probes which are uniformly paved in the sludge, and the probes are connected to an external detector.
9. The system for enhanced remediation of petroleum-contaminated soil by microbial-electro-chemical respirators of claim 4 or 5, wherein: the biological nutrient drip filtration equipment of the petroleum polluted soil aerobic reaction system comprises an aerobic reaction nutrient solution storage tank and a feeding pump, wherein an input port of the feeding pump is connected with the aerobic reaction nutrient solution storage tank, and an output port of the feeding pump is connected with a circulating pipeline of the biological reactor ventilation equipment so as to form circulating transportation.
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| CN112658028A (en) * | 2020-12-30 | 2021-04-16 | 森特士兴集团股份有限公司 | Electrochemical-microbial coupling repair system and application thereof |
| CN112872014B (en) * | 2021-01-08 | 2021-10-26 | 南开大学 | Stackable recyclable microbial electrochemical reactor and degradation method of petroleum hydrocarbon polluted soil |
| CN115724563B (en) * | 2021-08-31 | 2024-06-14 | 中国石油天然气股份有限公司 | Mobile aerobic microorganism sludge treatment system and treatment method |
| CN115007633B (en) * | 2022-06-14 | 2023-03-14 | 贵州大学 | In-situ repair method for lead-zinc waste residue storage yard |
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