CN205659980U - Joint fenton oxidation strengthening biological of electric power migration restores reactor that phenol pollutes soil - Google Patents
Joint fenton oxidation strengthening biological of electric power migration restores reactor that phenol pollutes soil Download PDFInfo
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- CN205659980U CN205659980U CN201620505619.2U CN201620505619U CN205659980U CN 205659980 U CN205659980 U CN 205659980U CN 201620505619 U CN201620505619 U CN 201620505619U CN 205659980 U CN205659980 U CN 205659980U
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- 239000002689 soil Substances 0.000 title claims abstract description 60
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 36
- 230000003647 oxidation Effects 0.000 title claims abstract description 30
- 238000013508 migration Methods 0.000 title claims abstract description 25
- 230000005012 migration Effects 0.000 title claims abstract description 24
- 238000005728 strengthening Methods 0.000 title abstract description 5
- 238000005273 aeration Methods 0.000 claims abstract description 69
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 52
- 235000015097 nutrients Nutrition 0.000 claims abstract description 32
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
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- 238000002347 injection Methods 0.000 claims description 42
- 239000007924 injection Substances 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 39
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- 239000004576 sand Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 11
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- 238000011049 filling Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
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- 238000006243 chemical reaction Methods 0.000 description 12
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
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- 210000000988 bone and bone Anatomy 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
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- Processing Of Solid Wastes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The utility model discloses a joint fenton oxidation strengthening biological of electric power migration restores reactor that phenol pollutes soil. The reactor includes electrode system, aeration systems, liquid phase filling pipe system and filtration liquid collecting system, utilizing this reactor to restore the in -process that phenol pollutes soil, to electrode system input voltage, constantly inputing hydrogen peroxide solution solution, moisture and nutrients by liquid phase filling pipe system simultaneously, let in the air through aeration systems, carry out phenol and pollute the soil restoration, the waste liquid enrichment is collected through filtration liquid collecting system. This reactor can improve the phenol transport efficiency, reparative process is stable, efficient, can stable, low -cost, efficient restoration phenol pollution soil.
Description
Technical Field
The utility model relates to an integrated reactor of electric power migration combined with Fenton oxidation enhanced bioremediation phenol pollution soil belongs to organic pollution soil remediation field.
Background
Phenolic pollutants are common organic pollutants in soil, and are accumulated in natural environment over time, are generally concerned due to high toxicity, and are prioritized for controlling pollutants in many countries. Among the remediation methods for phenol-contaminated soil, bioremediation is considered as one of the most potential remediation methods at present. Because the hydrophobicity and the stability of the phenol seriously limit the bioavailability and the bioremediation speed of the phenol, the improvement of the bioremediation efficiency by adopting strengthening measures becomes the key for bioremediation of the phenol-polluted soil.
The Fenton oxidation method is an efficient and widely-applied advanced oxidation method, and Fe is used under the acidic condition that the pH value is 2-42+Capable of catalytically decomposing H2O2The solution generates OH, and the free hydroxyl has strong oxidizing power, so that the organic pollutants which are difficult to degrade can be degraded in a short time.
The electrodynamic migration repair technology applies weak direct current to a polluted soil area to form an electric field, and enhances the bioavailability of pollutants in the soil environment by utilizing various electrodynamic effects generated by the direct current electric field; or to efficiently deliver various additives to contaminated areas within the soil. In the electro-kinetic migration bioremediation, a rotation switching mode is adopted, so that the pH value near an electrode and the change of soil moisture can be effectively controlled, the running stability of a system is improved, and the migration of pollutants and microorganisms is facilitated to present multi-direction and multi-speed. However, the electrodynamic force repairing technology is combined with the biological repairing technology, the pH value and the oxidation-reduction potential of the repairing body are easy to generate extreme changes, a large amount of hydrogen ions generated by anode electrolysis can seriously influence the growth environment of microorganisms, the activity of the microorganisms is reduced, and the repairing efficiency is reduced.
The combination of electrodynamic migration and Fenton oxidation is adopted, so that charged particles in soil can move directionally in an electric field, the polarity of the electric field is periodically switched, the pH value near the electrode and the change of soil moisture can be effectively controlled, the running stability of a system is improved, and when a rotary switching mode is adopted, the migration of chemical agents, pollutants and microorganisms is multi-directional and multi-rate, so that the chemical reaction and the bioremediation process are facilitated. Meanwhile, the process also comprises the steps of anode oxidation, electric adsorption and the like to degrade organic matters, and ferrous ions (Fe) are provided to the solution through iron anode oxidation 2+)，Fe2+With the addition of H2O2The Fenton reagent is formed to participate in the electrochemical reaction, so that the treatment cost can be saved to a certain extent. The electrodynamic force and the Fenton oxidation are combined, the restoration with the water content lower than 10% has poor electrodynamic force migration effect, the pH value of the restoration is required to be 2-4 under the conditions required by Fenton oxidation, the oxidation reaction can only be concentrated near the anode, and the pollutants are difficult to remove integrally.
SUMMERY OF THE UTILITY MODEL
The defect that exists to prior art, the utility model aims at providing a can improve phenol migration efficiency, repair process is stable, and the electric power that repair efficiency is high migrates and unites Fenton oxidation strengthening bioremediation phenol pollution soil's integration equipment.
In order to realize the technical purpose, the utility model provides a reactor for restoring phenol polluted soil by combining electrodynamic force migration and Fenton oxidation strengthening organisms;
the reactor comprises an electrode system, an aeration system, a liquid phase injection system and a percolate collecting system;
the electrode system comprises a direct current power supply and an electrode assembly, wherein the electrode assembly comprises an iron anode and a plurality of inert cathodes;
the aeration system comprises an air compressor and at least one group of aeration pipes, the aeration pipes are arranged at the lower part in the reactor, the group of aeration pipes comprise a main aeration pipe and a plurality of branch aeration pipes, and the main aeration pipe is connected with the air compressor;
The liquid phase injection system comprises a nutrient solution storage pool, a plurality of nutrient solution injection wells, a hydrogen peroxide storage pool and a plurality of hydrogen peroxide injection wells, wherein the nutrient solution storage pool is connected with each nutrient solution injection well, and the hydrogen peroxide storage pool is connected with each hydrogen peroxide injection well;
the leachate collecting system comprises a leachate treatment device, a sand filter layer and a leachate collecting device, wherein the leachate collecting device is arranged at the bottom in the reactor, the sand filter layer is paved on the leachate collecting device, and the leachate collecting device is connected with the leachate treatment device through a pipeline;
the iron anode is arranged at the central position in the reactor, and the inert cathodes are uniformly arranged at the periphery in the reactor; the iron anode and the inert cathode are both connected with a direct current power supply;
the hydrogen peroxide injection well is arranged close to the iron anode and is uniformly distributed around the iron anode; permeable pH buffer walls are arranged at the peripheries of the hydrogen peroxide injection well and the iron anode; the main ventilation pipe is annular and is arranged around the permeable pH buffer wall;
the aeration branch pipes are vertically arranged on the main aeration pipe and distributed along the direction from the iron anode to the inert cathode; the nutrient solution injection well is arranged in a region between the iron anode and the inert cathode.
In the preferable scheme, the thickness of the permeable pH buffer wall is 2-3 cm. The permeable pH buffer wall is composed of filling media including zeolite, lime and coral bones; wherein the mass ratio of the zeolite to the lime to the coral bone is (3-5): (1-2): (1-2).
According to the preferred scheme, the aeration system is provided with two groups of aeration pipes which are arranged in parallel up and down, and the parallel distance is 2-4 cm.
According to the preferable scheme, aeration holes are uniformly formed in the aeration branch pipes, the aperture of each aeration hole is 1-3 mm, and the distance between every two aeration holes is 10-20 mm.
In a preferable scheme, the surface of the aeration branch pipe is wrapped with gauze.
In a preferred scheme, the nutrient solution injection well is arranged between two adjacent aeration branch pipes.
In the preferable scheme, the reactor is a cylinder with a regular polygon or circular section, the distance from the center of the section of the cylinder to each vertex is 10-20 cm, or the radius of the section is 10-20 cm, and the depth of the cylinder is 10-30 cm.
In the preferred scheme, the thickness of the sand-stone filter layer is 3-4 cm.
Preferably, a constant temperature layer is arranged outside the reactor and is made of polyurethane.
In a preferred scheme, the thickness of the constant temperature layer is 1-2 cm.
According to the preferable scheme, a pressure pump I is arranged on a connecting pipeline of the nutrient solution storage pool and the nutrient solution injection well, and a pressure pump II is arranged on a connecting pipeline of the hydrogen peroxide storage pool and the hydrogen peroxide injection well.
Preferably, the inert cathode is a graphite cathode column or a graphite cathode plate.
The utility model discloses the method that the reactor that still provides is used for restoreing phenol contaminated soil includes following step:
1) naturally drying, grinding and sieving the phenol-polluted soil, and balancing the nutrient content and the moisture of the phenol-polluted soil;
adding straw, mushroom residue and phenol-polluted soil into the phenol-polluted soil according to the mass ratio of (0.02-0.06): (0.03-0.08): 1 to adjust C: n: p is (80-120): (8-12): (0.5-1), and adjusting the humidity of the phenol-polluted soil to be 20-30%;
2) filling the phenol-polluted soil pretreated by the step 1) into the reactor in a stacking manner;
3) spraying sodium dodecyl benzene sulfonate solution and white rot fungus-Pleurotus ostreatus suspension on the surface of the phenol-polluted soil pile in sequence;
the concentration of the sodium dodecyl benzene sulfonate solution is 0.05-0.06 mol.L-1The addition amount of the sodium dodecyl benzene sulfonate solution in the phenol-polluted soil is (0.10-0.15) L:1 kg;
the bacterial content of the white rot fungus-pleurotus ostreatus bacterial suspension is (1-5) multiplied by 109cfu/g, wherein the addition amount of the white rot fungus-pleurotus ostreatus suspension in the phenol-polluted soil is (0.15-0.3) L:1 kg;
4) Inputting voltage to the electrode system, continuously inputting hydrogen peroxide solution, moisture and nutrient substances by the liquid phase injection system, and introducing air through the aeration system to repair the phenol polluted soil;
the input rate of the hydrogen peroxide solution is 0.05-0.15L/h, and the concentration of the hydrogen peroxide solution is 25-30 wt%;
the water and nutrient input rate is such as to maintain the C: n: p is (80-120): (8-12): (0.5-1) and the humidity is 20-30%;
the air is introduced at a flow velocity of 0.5-0.6 m3/h；
The voltage intensity is 24-36V;
the input voltage mode of the electrode system is as follows: sequentially numbering 1-n inert cathodes distributed around the iron anode, firstly switching on the input voltage of the iron anode and the inert cathodes No. 1 and No. 2, and switching off the voltage of the iron anode and the inert cathodes No. 1 and No. 2 after 10-15 min; simultaneously switching on the input voltage of the iron anode and the inert cathodes No. 3 and No. 4, and switching off the voltage of the iron anode and the inert cathodes No. 3 and No. 4 after 10-15 min; the process is repeated in sequence and is carried out in a circulating mode until the remediation of the phenol-polluted soil is finished;
5) and collecting the waste liquid by a percolate collecting system for centralized treatment.
The reactor of the utility model is preferably a columnar reactor with a regular hexagon section, an iron anode column is arranged in the center of the center, and a graphite cathode column is arranged at each of six vertexes; 2-3 hydrogen peroxide solution injection wells are arranged near the iron anode column, and permeable pH buffer walls are arranged on the peripheries of the iron anode column and the hydrogen peroxide solution injection well; an aeration pipe and a nutrient solution injection well are arranged in the area outside the reaction wall; the bottom of the reactor is provided with a sand filtration layer, the bottom of the reactor is connected with a percolate treatment device, and percolate flows into the percolate treatment device and is discharged or reflows after reaching the standard after being treated.
The utility model discloses a technical principle that the reactor is used for restoreing phenol contaminated soil: the utility model discloses a reactor center is indisputable positive post, and six summits of regular hexagon are graphite negative pole post, lets in voltage after, under the effect of electric field, and iron positive post takes place oxidation reaction, consumes iron and produces ferrous ion, and electrode hydrolysis reaction produces a large amount of H+So that the contaminated soil near the anode is acidic, and the reaction equation of the anodic oxidation reaction is as follows:
Fe→Fe2++2e-
2H2O→O2↑+4H++4e-
a hydrogen peroxide solution injection well arranged near the anode provides a hydrogen peroxide solution, and Fe is subjected to Fenton reaction under an acidic condition with the pH of 2-42+Capable of catalytically decomposing H2O2OH is generated in the solution, hydroxyl free radicals can degrade organic matters which are difficult to degrade such as phenol and the like in a short time, Fenton reaction can be effectively carried out around the anode so as to achieve the purpose of primary degradation of phenol, and phenol in soil inside the reactor is migrated and enriched from the periphery to the iron anode in the center mainly under the action of electric force; the primary degradation product of phenol is dispersed under the action of electric field and diffusion, and further decomposed thoroughly under the action of microbes at the periphery of the anode area to form waste liquid, and the waste liquid is collected from a percolate collecting system at the bottom of the reactor and is treated in a centralized manner.
Compared with the prior art, the utility model discloses the beneficial technological effect that technical scheme of application brought:
the utility model discloses a reactor combines electric power migration, Fenton oxidation and bioremediation for the first time, the prosthetic reactor of phenol pollution soil of design integration, the enrichment and the concentrated processing of electro-migration technique is favorable to accelerating phenol, the Fenton oxidation is phenol and passes through the electrochemistry and realize high efficiency preliminary oxidation, the recombination microorganism realizes thorough decomposition to preliminary oxidation product, the prosthetic efficiency of phenol pollution soil can be improved greatly to the complete equipment, reduce the repair cost, be favorable to popularizing and applying.
The utility model discloses an iron anode region at reactor center can degrade phenol rapidly, high-efficiently because the ferrous ion that enrichment, the oxidation reaction of phenol produced and the acid condition that is fit for the Fenton oxidation reaction, but, because acid condition has seriously influenced the activity and the repair effect of microorganism. The utility model discloses technical scheme is through the permeable pH buffer wall that sets up zeolite, lime and coral bone in the regional periphery of positive pole and constitutes, when peracid solution passes through the reaction wall, with the potassium carbonate reaction generation carbon dioxide in the reaction wall, adjustable reactor pH, the inside pH of control reaction wall keeps at 2 ~ 4 within ranges, the outside pH of reaction wall keeps at 6.8 ~ 7.8 within ranges, be favorable to inside Fenton reaction and outside microbial degradation.
The utility model discloses an outside of reactor has set up constant temperature layer intermediate layer, and its inside filler is polyurethane, and its coefficient of heat conductivity is lower a lot than the air, and thermal insulation performance is good, and the temperature is steerable at 20 ~ 30 ℃ within range, and this temperature range is favorable to improving the activity and the growth rate of microorganism in the reactor.
Drawings
FIG. 1 is a schematic view of the overall structure of the reactor;
FIG. 2 is a top view of the reactor;
wherein,
1 is the nutrient solution storage tank, 2 is hydrogen peroxide solution storage tank, 3 is force (forcing) pump I, 4 is force (forcing) pump II, 5 is the nutrient solution injection well, 6 is inert cathode column (graphite cathode column), 7 is hydrogen peroxide solution injection well, 8 is indisputable positive pole post, 9 is filtration liquid collection device, 10 is permeable pH buffer wall, 11 is the grit filter layer, 12 is DC power supply, 13 is air compressor, 14 is the aeration branch pipe, 15 is the constant temperature layer, 16 is filtration liquid processing apparatus, 17 is the person in charge of ventilating.
Detailed Description
The following examples are intended to further illustrate the present invention in conjunction with the drawings of the specification, and not to limit the scope of the claims of the present invention.
The reactor structure of the utility model is shown in figure 1 and figure 2: the reactor main body comprises four parts of an electrode system, an aeration system, a liquid phase injection system and a percolate collecting system.
The electrode system mainly provides an electric field, provides a power source for electric power migration, and provides current for Fenton oxidation. The reactor is a cylinder with a regular hexagon section, the distance from the center of the section of the cylinder to each vertex is 20cm, and the depth of the cylinder is 20 cm. The electrode system comprises a direct current power supply 12 and an electrode assembly, wherein the electrode assembly comprises 1 iron anode column 8 and six graphite cathode columns 6; the iron anode posts 8 are arranged at the central position in the reactor, and the graphite cathode posts 6 are uniformly arranged at the top points in the regular hexagonal cylindrical reactor; the iron anode column 8 and the graphite cathode column 6 are both connected with a direct current power supply 12.
The aeration system mainly provides oxygen-containing gas for the reactor, and provides favorable living environment for aerobic microorganisms. The aeration system comprises an air compressor 13 and two groups of aeration pipes, the aeration pipes are arranged at the lower part in the reactor, one group of aeration pipes comprises a main aeration pipe 17 and six branch aeration pipes 14 arranged on the main aeration pipe 17, and the main aeration pipe 17 is connected with the air compressor 13; the two groups of aeration pipes are arranged in parallel up and down, and the parallel distance is 3 cm. Aeration holes are uniformly formed in the aeration branch pipes 14, the aperture of each aeration hole is 2mm, and the distance between every two aeration holes is 10 mm; the aeration branch pipe 14 is wrapped with gauze, so that the uniform gas distribution can be ensured, and the polluted soil is not easy to block gas holes. The diameter of the main aeration pipe is 15mm, the diameter of the branch aeration pipe is 5mm, and the main aeration pipe and the branch aeration pipe are made of PVC materials.
The liquid phase injection system mainly provides nutrient components and moisture for the reactor and provides Fenton oxidation reagent hydrogen peroxide solution, and the moisture and the nutrient components are necessary substances for metabolism of microorganisms, so that the survival of the microorganisms is facilitated; and the hydrogen peroxide solution is an oxidizing agent for Fenton oxidation. The liquid phase injection system includes nutrient solution reservoir 1 and six nutrient solution injection well 5 to and inject well 7 including hydrogen peroxide solution reservoir 2 and three hydrogen peroxide solution, nutrient solution reservoir 1 is connected with each nutrient solution injection well 5, is equipped with force (forcing) pump I3 on nutrient solution reservoir 1 and the connection official way of nutrient solution injection well 5, hydrogen peroxide solution reservoir 2 is connected with each hydrogen peroxide solution injection well 7, is equipped with force (forcing) pump II 4 on hydrogen peroxide solution reservoir 2 and the connecting tube of hydrogen peroxide solution injection well 7. The nutrient solution storage tank 1 is made of stainless steel material, the length, the width and the height are 30cm, 20cm and 20cm, and the volume is 12L.
The percolate collecting system is mainly a waste liquid collecting system in the reactor. The percolate collecting system comprises a percolate treatment device 16, a sand filter layer 11 and a percolate collecting device 9, wherein the percolate collecting device 9 is arranged at the bottom in the reactor, the sand filter layer 11 is laid on the percolate collecting device 9, and the percolate collecting device 9 is connected with the percolate treatment device 16 through a pipeline; the thickness of the sand filtering layer 11 is 3 cm. The maximum treatment capacity of the 16 percolate treatment device is 8L/d, and treated effluent flows back to the nutrient solution storage pool 1.
The hydrogen peroxide injection well 7 is arranged close to the iron anode posts 8 and is uniformly distributed around the iron anode posts 8; permeable pH buffer walls 10 are arranged on the peripheries of the hydrogen peroxide injection well 7 and the iron anode column, the permeable pH buffer walls 10 are cylindrical, and the iron anode column 8 and the hydrogen peroxide injection well 7 are isolated into a Fenton oxidation reaction area; the permeable pH buffer wall 10 is filled with medium composed of zeolite, lime and coral bone.
The main aeration pipe 17 is annular and is arranged around the permeable pH buffer wall 10; the aeration branch pipe 14 is vertically arranged on the main aeration pipe 17, and the aeration branch pipe 14 is distributed along the iron anode pole 8 to the graphite cathode pole 6; the nutrient solution injection well 1 is arranged in the area between the iron anode column 8 and the graphite cathode column 6 and is arranged between two adjacent aeration branch pipes 14.
A constant temperature layer 15 is arranged outside the reactor, and the constant temperature layer 15 is made of polyurethane; the thickness is 1cm, and the reactor temperature is mainly adjusted to keep the temperature at 20-30 ℃.
Example 1
Sieving and removing impurities from the excavated phenol-contaminated soil, and mixing the phenol-contaminated soil with mushroom residues and straws in a rotary drum, wherein 4% of mushroom residues and 2% of straws are added according to the mass proportion of the contaminated soil, and C in the phenol-contaminated soil is adjusted: n: p is (80-120): (8-12): (0.5-1) and regulating the water content to be 25%;
Secondly, adding the mixed polluted soil into a reactor in a pile form;
③ spraying sodium dodecyl benzene sulfonate (LAS) solution to the pile body with the concentration of 0.06 mol.L-1And the volume mass ratio of the solution to the polluted soil is 0.12L: 1 kg;
fourthly, after 1 hour, spraying a white rot fungus-pleurotus ostreatus suspension to the pile, wherein the volume mass ratio of the white rot fungus-pleurotus ostreatus suspension to the polluted soil is 0.2L: 1kg, the bacterial agent contains 4 multiplied by 109cfu/g；
Fourthly, pumping H through a pressure pump II2O230% H of solution reservoir2O2Solution in H2O2Solution injection well for injecting H into soil pile2O2The adding speed of the solution is 0.1L/h;
extracting urea and water in the liquid-phase storage tank by a pressure pump I to adjust the nutrient substance proportion C: n: p satisfies (80-120): (8-12): (0.5-1), and keeping the soil humidity at 20-30%;
sixthly, blowing air to the soil pile body by an air compressor through an aeration system every day for aeration, and controlling the air flow rate to be 0.5-0.6 m3/h；
Seventhly, starting a power switch, establishing an electric field between the iron anode and the graphite cathode, setting the voltage to be 30V, and switching the electrodes in a mode of: firstly, opening an iron anode and two graphite cathodes with numbers 1 and 2, and reacting for 10 min; secondly, closing the two graphite cathodes with the numbers 1 and 2, and simultaneously opening the two graphite cathodes with the numbers 3 and 4 for reaction for 10 min; step three, closing the two graphite cathodes with the numbers 3 and 4, simultaneously opening the two graphite cathodes with the numbers 5 and 6, and reacting for 10 min; repeating the steps until the polluted soil is repaired;
When the concentration of the pollutants reaches the discharge standard, collecting waste liquid from the percolate collecting system, and transporting the waste liquid back to the original place or changing the waste liquid into other purposes.
The phenol content used in the examples was 300mg kg-1The contaminated soil of (2). After 7d of treatment, the tested soil phenol content is 35.48 mg-kg-1The removal rate was 88.2%.
Claims (10)
1. A reactor for reinforcing bioremediation of phenol contaminated soil by combining electric power migration and Fenton oxidation is characterized in that:
the reactor comprises an electrode system, an aeration system, a liquid phase injection system and a percolate collecting system;
the electrode system comprises a direct current power supply (12) and an electrode assembly, wherein the electrode assembly comprises an iron anode (8) and a plurality of inert cathodes (6);
the aeration system comprises an air compressor (13) and at least one group of aeration pipes, the aeration pipes are arranged at the lower part in the reactor, the group of aeration pipes comprise a main aeration pipe (17) and a plurality of branch aeration pipes (14), and the main aeration pipe (17) is connected with the air compressor (13);
the liquid phase injection system comprises a nutrient solution storage pool (1), a plurality of nutrient solution injection wells (5), a hydrogen peroxide storage pool (2) and a plurality of hydrogen peroxide injection wells (7), wherein the nutrient solution storage pool (1) is connected with each nutrient solution injection well (5), and the hydrogen peroxide storage pool (2) is connected with each hydrogen peroxide injection well (7);
the leachate collecting system comprises a leachate treatment device (16), a sand filtration layer (11) and a leachate collecting device (9), wherein the leachate collecting device (9) is arranged at the bottom in the reactor, the sand filtration layer (11) is laid on the leachate collecting device (9), and the leachate collecting device (9) is connected with the leachate treatment device (16) through a pipeline;
The iron anode (8) is arranged at the central position in the reactor, and the inert cathodes (6) are uniformly arranged on the periphery in the reactor; the iron anode (8) and the inert cathode (6) are both connected with a direct current power supply (12);
the hydrogen peroxide injection well (7) is arranged close to the iron anode (8) and is uniformly distributed around the iron anode (8); permeable pH buffer walls (10) are arranged on the peripheries of the hydrogen peroxide injection well (7) and the iron anode (8); the main ventilation pipe (17) is annular and is arranged around the permeable pH buffer wall (10);
an aeration branch pipe (14) is vertically arranged on the main aeration pipe (17), and the aeration branch pipe (14) is distributed along the iron anode (8) to the inert cathode (6); the nutrient solution injection well (5) is arranged in the area between the iron anode (8) and the inert cathode (6).
2. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, wherein: the permeable pH buffer wall (10) is 2-3 cm thick.
3. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, wherein: the aeration system is provided with two groups of aeration pipes which are arranged in parallel up and down, and the parallel distance is 2-4 cm.
4. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, wherein: aeration holes are uniformly formed in the aeration branch pipes (14), the aperture of each aeration hole is 1-3 mm, and the distance between every two aeration holes is 10-20 mm.
5. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton's oxidation as claimed in claim 4, wherein: the surface of the aeration branch pipe (14) is wrapped with gauze.
6. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, wherein: the nutrient solution injection well (5) is arranged between two adjacent aeration branch pipes (14).
7. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, wherein: the thickness of the sand filtering layer (11) is 3-4 cm.
8. The reactor for the electric power migration and Fenton oxidation enhanced bioremediation of phenol contaminated soil according to any one of claims 1 to 7, wherein: the reactor is a cylinder with a regular polygon or circular section, the distance from the center of the section of the cylinder to each vertex is 10-20 cm, or the radius of the section is 10-20 cm, and the depth of the cylinder is 10-30 cm.
9. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton's oxidation as claimed in claim 8, wherein: the reactor is externally provided with a thermostatic layer (15) made of polyurethane material.
10. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton's oxidation as claimed in claim 9, wherein: the thickness of the constant temperature layer (15) is 1-2 cm.
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| CN106001084A (en) * | 2016-05-30 | 2016-10-12 | 湖南恒凯环保科技投资有限公司 | Reactor for strengthening biological repairing of phenol contaminated soil through combination of electric power migration and Fenton oxidation and method for repairing phenol contaminated soil |
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| CN106001084A (en) * | 2016-05-30 | 2016-10-12 | 湖南恒凯环保科技投资有限公司 | Reactor for strengthening biological repairing of phenol contaminated soil through combination of electric power migration and Fenton oxidation and method for repairing phenol contaminated soil |
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