CN106001084B - 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 - Google Patents
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 Download PDFInfo
- Publication number
- CN106001084B CN106001084B CN201610367833.0A CN201610367833A CN106001084B CN 106001084 B CN106001084 B CN 106001084B CN 201610367833 A CN201610367833 A CN 201610367833A CN 106001084 B CN106001084 B CN 106001084B
- Authority
- CN
- China
- Prior art keywords
- phenol
- reactor
- contaminated soil
- aeration
- iron anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002689 soil Substances 0.000 title claims abstract description 88
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 30
- 230000005012 migration Effects 0.000 title claims abstract description 27
- 238000013508 migration Methods 0.000 title claims abstract description 27
- 230000003647 oxidation Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title abstract description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000243 solution Substances 0.000 claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 235000015097 nutrients Nutrition 0.000 claims abstract description 34
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007791 liquid phase Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 98
- 238000005273 aeration Methods 0.000 claims description 66
- 229910052742 iron Inorganic materials 0.000 claims description 47
- 239000006174 pH buffer Substances 0.000 claims description 14
- 238000005067 remediation Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 235000014653 Carica parviflora Nutrition 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 241000243321 Cnidaria Species 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 229910021536 Zeolite Inorganic materials 0.000 claims description 6
- 210000000988 bone and bone Anatomy 0.000 claims description 6
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000010457 zeolite Substances 0.000 claims description 6
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 5
- 239000010902 straw Substances 0.000 claims description 5
- 230000001580 bacterial effect Effects 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 235000021049 nutrient content Nutrition 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 241000894006 Bacteria Species 0.000 abstract description 3
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 17
- 239000010439 graphite Substances 0.000 description 17
- 229910002804 graphite Inorganic materials 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000010410 layer Substances 0.000 description 13
- 244000005700 microbiome Species 0.000 description 12
- 230000005684 electric field Effects 0.000 description 10
- 230000005520 electrodynamics Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 5
- 230000000813 microbial effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 229910001448 ferrous ion Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000693 micelle Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000004965 peroxy acids Chemical class 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000012028 Fenton's reagent Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Botany (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a reactor for strengthening biological repairing of phenol contaminated soil through combination of electric power migration and Fenton oxidation and a method for repairing the phenol contaminated soil. The reactor comprises an electrode system, an aerating system, a liquid phase injection system and a leachate collecting system. The method for repairing the phenol contaminated soil through the reactor includes the steps that after the phenol contaminated soil is pretreated, the reactor is filled with the phenol contaminated soil; a sodium dodecyl benzene sulfonate solution and a white-rot fungi-pleurotus ostreatus bacterium suspension are sequentially sprayed to the surface of a pile; voltage is input to the electrode system, meanwhile, a hydrogen peroxide solution, water and nutrient substances are continuously input through the liquid phase injection system, air is led in through the aerating system, and the phenol contaminated soil is repaired; and waste liquid is concentrated and is collected through the leachate collecting system. By means of the reactor, the phenol migration efficiency can be improved, the repairing process is stable, efficiency is high, and the phenol contaminated soil can be stably and efficiently repaired with low cost.
Description
Technical Field
The invention relates to an integrated reactor for restoring phenol-polluted soil by combining electrodynamic migration with Fenton oxidation strengthening and biological remediation, and a method for restoring phenol-polluted soil based on the reactor, and belongs to the field of organic polluted soil restoration.
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 oxidation2+)，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.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the integrated equipment which can improve the phenol migration efficiency, has stable repairing process and high repairing efficiency and is used for restoring the phenol-polluted soil by combining the electrodynamic migration with Fenton oxidation strengthening and biological repairing.
Another purpose of the invention is to provide a method for stably, inexpensively and efficiently restoring the phenol-polluted soil.
In order to realize the technical purpose, the invention provides a reactor for reinforcing bioremediation of phenol-polluted soil by combining electrodynamic force migration and Fenton oxidation;
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.
Preferably, 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).
In the preferable scheme, the thickness of the permeable pH buffer wall is 2-3 cm.
In the preferred scheme, the aeration system is provided with two groups of aeration pipes which are arranged in parallel up and down. 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.
In a preferable scheme, a constant temperature layer is arranged outside the reactor and is made of polyurethane; 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 invention also provides a method for restoring phenol-contaminated soil based on the reactor, which comprises the following steps:
1) naturally drying, grinding and sieving the phenol-polluted soil, and balancing the nutrient content and the moisture of the phenol-polluted soil;
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;
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;
5) and collecting the waste liquid by a percolate collecting system for centralized treatment.
According to the preferable scheme, mushroom residues and straws are added into the phenol-polluted soil to regulate the content of C in the phenol-polluted soil: n: p is (80-120): (8-12): (0.5-1) and adjusting the humidity of the phenol-polluted soil to be 20-30%.
In the preferred scheme, 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.
Preferably, the bacterial content of the white rot fungus-pleurotus ostreatus bacterial suspension is (1-5) × 109cfu/g, the addition amount of the white rot fungus-pleurotus ostreatus suspension in the phenol-contaminated soil is (0.15-0.3) L:1 kg.
In the preferred scheme, 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%;
preferably, the water and nutrient input rate is such as to maintain the C: n: p is (80-120): (8-12): (0.5-1) and a humidity of 20-30%.
In the preferable scheme, the air is introduced at the flow velocity of 0.5-0.6 m3/h。
Preferably, the voltage intensity is 24-36V.
Preferably, the mode of inputting the voltage by 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; and the rest is repeated and circulated until the remediation of the phenol-polluted soil is finished.
In the preferred scheme, the mass ratio of the straw to the mushroom residue to the phenol-polluted soil is (0.02-0.06): (0.03-0.08): 1.
in the preferable scheme, in order to improve the migration effect of phenol and less influence the normal growth of microorganisms, the electric field gradient is set to be 2.0-3.0V/cm.
The reactor is preferably a cylindrical reactor with a regular hexagon section, an iron anode column is arranged in the center of the reactor, 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 reactor of the invention is used for repairing phenol polluted soil and has the technical principle that: the center of the reactor of the invention is an iron anode column, six vertexes of a regular hexagon are graphite cathode columns,after voltage is applied, under the action of electric field, the iron anode column is oxidized to consume iron and produce ferrous ion, and electrode hydrolysis reaction produces great 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 technical scheme provided by the invention has the beneficial technical effects that:
the reactor disclosed by the invention combines electric power migration, Fenton oxidation and bioremediation for the first time, and designs an integrated reactor for remedying the phenol-polluted soil, the electric migration technology is favorable for accelerating the enrichment and the concentration treatment of phenol, the Fenton oxidation is used for realizing rapid and efficient primary oxidation of phenol through electrochemistry, and the primary oxidation product is thoroughly decomposed by combining microorganisms, so that the overall device can greatly improve the remediation efficiency of the phenol-polluted soil, reduce the remediation cost, and is favorable for popularization and application.
In the technical scheme of the invention, the sodium dodecyl benzene sulfonate (LAS) auxiliary agent is added into the phenol-polluted soil, so that the desorption rate of phenol from the soil can be effectively improved, and the migration rate of phenol is greatly improved. Mainly because phenol solubility is low, electrodialysis migration to an iron anode area is difficult to carry out so as to carry out Fenton oxidation and microbial degradation, and the desorption of soil phenol can be remarkably promoted by adding a sodium dodecyl benzene sulfonate (LAS) solution into phenol contaminated soil. On one hand, the LAS solution can influence the adsorption and desorption processes of phenol in soil, and water-soluble phenol is obviously added; on the other hand, the sulfonic group with negative charges of LAS can be adsorbed on the surface of sandy soil through the action of the surface of an obligate point or the action of a hydrogen bond to form a micelle. The micelle can adsorb phenol, and moves to the anode through electromigration due to negative charge of the micelle, so that the migration enrichment effect is increased. Both of them have promoting effect on phenol migration and enrichment.
In the technical scheme of the invention, the iron anode area in the center of the reactor can rapidly and efficiently degrade phenol due to the enrichment of phenol, ferrous ions generated by oxidation reaction and acidic conditions suitable for Fenton oxidation reaction, but the activity and the repair effect of microorganisms are seriously influenced due to the acidic conditions. According to the technical scheme, the permeable pH buffer wall formed by zeolite, lime and coral bones is arranged on the periphery of the anode area, when the peracid solution passes through the reaction wall, the peracid solution reacts with potassium carbonate in the reaction wall to generate carbon dioxide, the pH of the reactor can be adjusted, the pH inside the reaction wall is controlled to be kept within a range of 2-4, the pH outside the reaction wall is kept within a range of 6.8-7.8, and the Fenton reaction inside the reaction wall and the microbial degradation outside the reaction wall are facilitated.
In the technical scheme of the invention, in the electric bioremediation, in order to effectively control the pH value near the graphite cathode and the change of soil moisture and increase the running stability of the system, a rotary switching mode is adopted, so that the migration of pollutants and microorganisms can be in the characteristics of multiple directions and multiple rates, and the microbial remediation process is facilitated. The overall microbial population of the soil is maintained by adopting a rotary switching mode, so that the microbial population of the middle soil and the cathode soil is maintained at a higher level, and the growth of soil microbes is facilitated by the action of a proper electric field.
According to the technical scheme, the constant-temperature interlayer is arranged outside the reactor, the polyurethane is used as the filler inside the reactor, the heat conductivity coefficient of the polyurethane is much lower than that of air, the heat preservation performance is good, the temperature can be controlled within the range of 20-30 ℃, and the temperature range is favorable for improving the activity and the growth rate of microorganisms 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 (graphite cathode column), 7 is the 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 disclosure in conjunction with the accompanying drawings and not to limit the scope of the claims of the present disclosure.
The reactor structure of the present invention is shown in fig. 1 and 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 stack to give a concentration of 0.06 mol.L-1And the volume mass ratio of the solution to the polluted soil is 0.12L: 1 kg;
④ 1 hours later, the stack body is sprayed with white rot fungus-Pleurotus ostreatus suspension, the volume mass ratio of the white rot fungus-Pleurotus ostreatus suspension to the polluted soil is 0.2L: 1kg, the bacterium content of the bacterium agent is 4 × 109cfu/g；
④ pumping H through booster 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%;
⑥ aerating the soil pile with air compressor via aeration system every day with air flow rate controlled at 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 (9)
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 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;
the aeration system is provided with two groups of aeration pipes which are arranged in parallel up and down;
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;
the surface of the aeration branch pipe is wrapped with gauze.
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 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).
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 nutrient solution injection well is arranged between two adjacent aeration branch pipes.
4. The reactor for enhanced bioremediation of phenol contaminated soil by electro-kinetic migration in combination with Fenton oxidation according to claim 1, 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;
the thickness of the sand-stone filtering layer is 3-4 cm.
5. The method for remediating phenol-contaminated soil based on the reactor as set forth in any one of claims 1 to 4, characterized in that: the method comprises the following steps:
1) naturally drying, grinding and sieving the phenol-polluted soil, and balancing the nutrient content and the moisture of the phenol-polluted soil;
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;
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;
5) and collecting the waste liquid by a percolate collecting system for centralized treatment.
6. The reactor-based method for remediating phenol contaminated soil as recited in claim 5, wherein: and (3) adding mushroom residues and straws into the phenol-polluted soil to regulate C: n: p is (80-120): (8-12): (0.5-1) and adjusting the humidity of the phenol-polluted soil to be 20-30%.
7. The reactor-based method for remediating phenol contaminated soil as recited in claim 5, wherein: 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) × 109cfu/g, the addition amount of the white rot fungus-pleurotus ostreatus suspension in the phenol-contaminated soil is (0.15-0.3) L:1 kg.
8. The reactor-based method for remediating phenol contaminated soil as recited in claim 5, wherein: 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.
9. The reactor-based method for remediating phenol contaminated soil as recited in claim 5, wherein: 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; and the rest is repeated and circulated until the remediation of the phenol-polluted soil is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610367833.0A CN106001084B (en) | 2016-05-30 | 2016-05-30 | 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610367833.0A CN106001084B (en) | 2016-05-30 | 2016-05-30 | 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106001084A CN106001084A (en) | 2016-10-12 |
| CN106001084B true CN106001084B (en) | 2017-04-26 |
Family
ID=57092351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610367833.0A Active CN106001084B (en) | 2016-05-30 | 2016-05-30 | 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106001084B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106957125B (en) * | 2017-04-17 | 2019-09-27 | 中源晟朝股份有限公司 | A kind of underground water in situ remediation system |
| CN108637007A (en) * | 2018-06-01 | 2018-10-12 | 广西博世科环保科技股份有限公司 | The system that microbiological fuel cell strengthens renovation of organic pollution soil |
| CN109513739B (en) * | 2018-11-02 | 2021-03-02 | 江苏澳洋生态园林股份有限公司 | Electrochemical oxidation soil remediation device |
| CN111375627A (en) * | 2019-10-09 | 2020-07-07 | 闻勤动力设备(上海)有限公司 | Device and method for restoring organic contaminated soil and underground water through pulse discharge |
| CN111282983B (en) * | 2020-02-20 | 2025-03-04 | 中科鼎实环境工程有限公司 | Electrothermal coupled chemical oxidation method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2225271C2 (en) * | 2002-05-23 | 2004-03-10 | Ооо Пкф "Бигор" | Method of purification of soils from underground pollution by phenols |
| CN103316902B (en) * | 2013-07-10 | 2014-10-08 | 华北电力大学 | Device and method for repairing phthalate-polluted soil and underground water through photoelectric Fenton principle |
| CN205659980U (en) * | 2016-05-30 | 2016-10-26 | 湖南恒凯环保科技投资有限公司 | Joint fenton oxidation strengthening biological of electric power migration restores reactor that phenol pollutes soil |
-
2016
- 2016-05-30 CN CN201610367833.0A patent/CN106001084B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106001084A (en) | 2016-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205659980U (en) | Joint fenton oxidation strengthening biological of electric power migration restores reactor that phenol pollutes soil | |
| CN106001084B (en) | 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 | |
| CN105665437B (en) | A kind of device using Electroremediation contaminated soil | |
| CN107698037B (en) | Method for advanced treatment of landfill leachate reverse osmosis concentrated water by three-dimensional electrochemical coupling of three-dimensional electrobiology | |
| CN112642854B (en) | Method for combined restoration of heavy metal organic composite polluted soil by electric-aeration-liquid injection | |
| CN102070230A (en) | Method for removing organic matters in water by utilizing three-dimensional electrode electro-fenton and device thereof | |
| CN103316908A (en) | Device and method for restoring soil polluted by polychlorinated biphenyl | |
| CN207375910U (en) | A kind of processing system of landfill leachate | |
| CN103787490B (en) | A kind of for the treatment of the bio-electrochemical reactor of waste water from organic fluorine industry and the treatment process of waste water from organic fluorine industry | |
| CN109205928B (en) | Method and system for advanced treatment of leachate | |
| CN107413837A (en) | Device and the application of oil heavy-metal composite pollution soil are repaired with electronic microbial association | |
| CN106277637B (en) | Method and system for treating black and odorous surface water | |
| CN108793391A (en) | A kind of device and method of Fe-C electrodes collaboration aerobic particle mud processing antibiotic medicine waste water | |
| CN110883085A (en) | ERB combined remediation method and device for organic pesticide pollution | |
| CN110240367B (en) | Sewage treatment system and method for synchronous and efficient removal of carbon, nitrogen and phosphorus | |
| CN105600880A (en) | Advanced treatment device for nitrogen-containing heterocyclic ring compound chemical tail water and combination technology thereof | |
| CN201511038U (en) | Electrodynamic Remediation Device for Chromium Contaminated Soil | |
| CN107983762A (en) | Solar photovoltaic driven bioelectrochemical soil remediation system and method | |
| CN205701842U (en) | A kind of device utilizing Electroremediation contaminated soil | |
| CN211304230U (en) | ERB combined repairing device for organic pesticide pollution | |
| CN102241457A (en) | Integrated underground economical sanitary sewage treatment apparatus | |
| CN111036070B (en) | Polarity bionic aquatic weed enhanced ecological indoor air purification device and method | |
| CN111250537A (en) | A bioremediation system for organically polluted sites | |
| CN108706820A (en) | A kind of combined soil ground water circulation processing unit | |
| CN106311729B (en) | Application of electrocatalytic water equipment in soil pollution treatment and soil pollution treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |