CN113683180A - Ozone advanced oxidation system for underground water in-situ pumping treatment - Google Patents
Ozone advanced oxidation system for underground water in-situ pumping treatment Download PDFInfo
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- CN113683180A CN113683180A CN202110997967.1A CN202110997967A CN113683180A CN 113683180 A CN113683180 A CN 113683180A CN 202110997967 A CN202110997967 A CN 202110997967A CN 113683180 A CN113683180 A CN 113683180A
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 198
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 67
- 230000003647 oxidation Effects 0.000 title claims abstract description 41
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
- 238000005086 pumping Methods 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 78
- 238000002360 preparation method Methods 0.000 claims abstract description 25
- 239000003054 catalyst Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 239000003673 groundwater Substances 0.000 claims abstract description 15
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 13
- 230000002265 prevention Effects 0.000 claims abstract description 13
- 231100000719 pollutant Toxicity 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 38
- 239000001301 oxygen Substances 0.000 claims description 38
- 229910052760 oxygen Inorganic materials 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 14
- 238000005273 aeration Methods 0.000 claims description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 1
- 229910001882 dioxygen Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 description 11
- 238000000605 extraction Methods 0.000 description 9
- 230000008439 repair process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- -1 sulfate radical Chemical class 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 238000005067 remediation Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000003895 groundwater pollution Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 3
- 239000012028 Fenton's reagent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 description 1
- IQUPABOKLQSFBK-UHFFFAOYSA-N 2-nitrophenol Chemical compound OC1=CC=CC=C1[N+]([O-])=O IQUPABOKLQSFBK-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
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- 239000008367 deionised water Substances 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 238000011049 filling Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
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- 231100000518 lethal Toxicity 0.000 description 1
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- 231100000219 mutagenic Toxicity 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 239000010815 organic waste Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
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- 230000001988 toxicity Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/66—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
- B01D53/8675—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/2073—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses an ozone advanced oxidation system for groundwater in-situ and pumping treatment, which comprises an ozone preparation device and an oxidation reaction device, wherein ozone prepared by the ozone preparation device can be switched to be introduced into an injection well for ozone in-situ oxidation or an ozone reaction tower of the oxidation reaction device at a water return prevention tank of the oxidation reaction device, the ozone reaction tower is filled with a catalyst filler, and the ozone reacts with sewage pumped to the ozone reaction tower under the catalysis of the catalyst to remove pollutants.
Description
Technical Field
The invention belongs to the field of environmental protection, and relates to an ozone advanced oxidation system for in-situ extraction treatment of underground water.
Background
With the development of society, the discharge of organic wastes is increasing day by day, and pollutants infiltrate vertically along the aeration zone and migrate and diffuse along with underground water flow, so that the pollution of soil and underground water is more and more serious. In the beginning of the 60 s of the 20 th century, groundwater pollution is gradually increased, and groundwater remediation technology is also developed. The technology has made great progress in the aspect of groundwater pollution treatment in China, and has gradually developed and formed a more systematic groundwater pollution treatment technology. Common groundwater remediation techniques are broadly divided into three categories: in-situ repair techniques, ex-situ repair techniques and natural attenuation repair.
The groundwater in-situ remediation technology refers to a method for in-situ recovery and treatment of a pollution source and a polluted water body, and common forms include in-situ chemical oxidation, biological remediation, permeable reactive barrier remediation technologies and the like.
Patent CN111825222A relates to a pipe simulation normal position bioremediation device, including normal position bioremediation test tube, the dystopy that is connected with normal position bioremediation test tube goes out water regulating tank and high-order carbon source supply tank, and normal position bioremediation test tube is inside evenly to be filled the simulation and to contain the ore aquifer ore, and normal position bioremediation test tube's both ends shutoff just has a plurality of sample monitoring mouths. The patent CN109775862A relates to reaction wall repair, a repair well is arranged in a groundwater reaction main well, the repair well comprises a pumping well and an aeration well, an aeration pipe is arranged in the aeration well, the aeration pipe is connected with an air compressor on the ground, the aeration pipe is arranged at the bottom of the center of the repair well, an automatic sample collecting device is arranged in the aeration well, and a filter material is filled between the repair well and the groundwater reaction main well; the permeable reaction processing unit comprises a plurality of reaction unit components with sandwich structures, a positioning connecting groove is arranged between every two adjacent reaction units, the connected reaction units are placed in the repair well pipe, and mixed biological fillers are loaded in the sandwich space of the reaction units; a water quality analysis probe is arranged in the permeable reaction unit; the two-wing impervious walls are arranged on the two side wings of the restoration well, and the operation longitudinal depth of the two-wing impervious walls penetrates through the first submerged aquifer; the effluent monitoring pool is arranged below the ground, and a water quality and water level automatic monitoring system is arranged in the effluent monitoring pool; the automatic control system adopts a PLC control system. And a chemical oxidation method by injecting Fenton reagent, persulfate and the like is widely applied to organic pollution sites in China.
The Fenton reagent has high oxidation-reduction potential, can oxidize most organic matters and has quick reaction, but the reaction pH needs to be controlled to be about 3, which easily causes the damage to the natural ecosystem of the underground water.
When sodium persulfate is used as oxidant, it is decomposed to generate new active sulfate radical, and SO is generated under strong alkali condition4 -Can react with OH-More hydroxyl free radicals OH are generated in the reaction, so that the pH value of a sodium persulfate oxidation system needs to be adjusted by using a sodium hydroxide solution, and the pH value of underground water and the soil environment is reduced by adding the sodium hydroxide solution, so that the acid-base balance is damaged. In addition, it is pointed out from the research on the mechanism of formation of nitro by-products in the advanced oxidation of sulfate radicals that the strong oxidizing property of sulfate radicals makes it possible to obtain nitro by-productsIt can effectively degrade organic pollutants and oxidize Nitrite (NO) commonly existing in the environment2 -) Generation of nitrogen dioxide radical (NO)2Cndot.). The nitrogen dioxide free radical is an electrophilic free radical, and can quickly react with humus in an environmental medium to be converted into a series of nitro aromatic compounds such as nitrophenol and dinitrophenol. Such contaminants have persistent and lethal, teratogenic, mutagenic "triple-induced" toxicity, presenting potential risks to ecosystem and population health. And the SO generated by the sodium persulfate while degrading the pollutants4 2-Resulting in groundwater SO4 2-Exceeding standard, high processing difficulty and secondary pollution.
Ozone is an allotrope of oxygen, the oxidation-reduction potential of which is 2.07eV, and can oxidize various organic pollutants in water to achieve the purpose of water purification, and two main approaches are provided: the first is the direct oxidation between ozone molecule and organic pollutant, and the other is that ozone produces the hydroxyl radical after being decomposed, and indirect and aquatic organic pollutant effect, ozone and organic pollutant's indirect effect is non-selective, and the hydroxyl radical has extremely strong oxidability (redox potential 2.8eV), can reach the purpose of getting rid of the pollutant with the multiple organic matter reaction of aquatic, and does not have secondary pollution.
Therefore, it is necessary to design an advanced ozone oxidation system for groundwater in-situ extraction treatment to solve the existing technical problems.
Disclosure of Invention
The invention aims to solve the technical problems, provides an ozone advanced oxidation system for underground water in-situ extraction treatment, and the ozone advanced oxidation system has a reasonable structure and is convenient to operate, can flexibly switch treatment modes of in-situ injection and extraction treatment according to different site conditions, and obviously improves the treatment efficiency of an ozone oxidation process.
In order to solve the technical problems, the invention provides an ozone advanced oxidation system for underground water in-situ extraction treatment, which comprises an ozone preparation device and an oxidation reaction device, wherein ozone prepared by the ozone preparation device can be switched to be introduced into an injection well at a water return prevention tank of the oxidation reaction device for ozone in-situ oxidation or introduced into an ozone reaction tower of the oxidation reaction device, the ozone reaction tower is filled with a catalyst filler, and the ozone reacts with sewage extracted to the ozone reaction tower under the catalysis of the catalyst to remove pollutants;
the ozone preparation device comprises an ozone generator, an air compressor, a freeze dryer and an oxygen generator, compressed air prepared by the air compressor is filtered in two stages, dried by the freeze dryer and stored in a compressed air storage tank, the compressed air in the compressed air storage tank is sent to the oxygen generator, an adsorber of the oxygen generator adsorbs nitrogen and carbon dioxide, so that oxygen is enriched in a gas phase, the oxygen prepared by the oxygen generator is stored in an oxygen cache tank, and the oxygen in the oxygen cache tank enters the ozone generator to prepare ozone;
the oxidation reaction device comprises a sewage inlet pump, a bag filter and an ozone reaction tower, underground water enters a sewage adjusting tank from a pumping well, the effluent of the sewage adjusting tank enters the ozone reaction tower through the bag filter inlet pump through the inlet pump, and catalyst filler is filled in the ozone reaction tower.
As a preferred embodiment, the ozone generator generates ozone by discharging oxygen prepared by an oxygen generator at medium frequency and high voltage, and a discharge tube of the ozone generator is made of borosilicate glass material.
In a preferred embodiment, the ozone preparation device further comprises a water chiller, a circulating cooling water jacket is arranged outside the discharge tube, and a pipeline of the circulating cooling water jacket is communicated with the water chiller.
As a preferred embodiment, the ozone gas supply pipeline is arranged at the upper end of the water return prevention tank, the water return prevention tank is provided with a magnetic turning plate liquid level meter and an emptying electromagnetic valve, the magnetic turning plate liquid level meter monitors the liquid level in the tank, and the emptying electromagnetic valve is automatically opened to discharge stored water reaching a set height.
As a preferred embodiment, compressed air prepared by an air compressor of the ozone preparation device and ozone are alternately introduced into an injection well so as to enhance the diffusion capacity of the ozone.
As a preferred embodiment, the oxidation reaction device further comprises a chemical box, wherein the chemical in the chemical box is hydrogen peroxide, and the chemical can be switched and added to the ozone reaction tower or the injection well according to needs. The hydrogen peroxide can promote the generation of hydroxyl radicals so as to degrade organic matters into carbon dioxide and water.
As a preferred embodiment, the number of the ozone reaction towers is plural, and the towers are arranged in series; the inside of ozone reaction tower sets up micropore aeration head, the microbubble that micropore aeration head produced can improve the mass transfer speed of ozone, strengthens ozone's oxidizing power.
As a preferred embodiment, the packing material filled in the ozone reaction tower is an ozone catalyst, and Fe is selected according to different pollutants to be removed and reaction conditions2+、Fe3+、Mn2+、Ni2+NiO or Al2O3And the like.
As a preferred embodiment, the oxidation reaction device also comprises an ozone destructor, and the ozone destructor is connected with the ozone reaction tower. The ozone destructor uses a catalyst MnO2The ozone not used in the ozone reaction tower is destroyed by heating at a high temperature of 105 ℃.
As a preferred embodiment, when the ozone prepared by the ozone preparation device is introduced into the injection well through the anti-return water tank of the oxidation reaction device for ozone in-situ oxidation, the pressure of the outlet pipeline of the ozone preparation device is set at 0.3 MPa. Specifically, the pressure of the ozone generator air outlet pipeline is set to be 0.3MPa through the interlocking effect of the pressure transmitter and the electric regulating valve, so that the pressure loss of water and soil during ozone injection is overcome.
The invention has the beneficial effects that:
(1) the method can switch in-situ injection and extraction treatment according to different site conditions, is convenient to operate, and obviously improves the efficiency of the ozone oxidation process for groundwater remediation.
(2) In order to enhance the ozone diffusion range, compressed air is alternately injected into the injection well for disturbance, and meanwhile, hydrogen peroxide is injected for synergistic catalysis, so that the pollutants in the underground water are accelerated to be oxidized by ozone, and the treatment effect is optimal.
(3) Ozone is introduced into the ozone reaction tower through the anti-return water tank, a water inlet pump is started, and sewage sequentially enters the three-stage reaction tower connected in series after passing through the bag filter; mixing ozone and sewage in a reaction tower, and reacting under the catalysis of a catalyst to remove pollutants; the treated sewage flows out of the outlet of the 3# reaction tower, enters the water outlet tank and is recharged with underground water or discharged outside through the water outlet pump; the ozone which is not fully reacted in the reaction tower enters the ozone destructor from the top and is discharged into the atmosphere after reaching the standard.
(4) In order to prevent the catalyst from being blocked, three branches are connected to each stage of ozone reaction tower from a compressed air storage tank of the ozone preparation device, compressed air is introduced from the bottom of the reaction tower, and each branch is provided with a manual ball valve which can be regulated and controlled according to actual operation conditions.
Drawings
The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the invention and in which:
FIG. 1 is a plan view of an ozone production unit of an ozone advanced oxidation system for groundwater in-situ, extraction treatment according to the present invention;
FIG. 2 is a plan view of an oxidation reaction unit of an ozone advanced oxidation system for groundwater in-situ extraction treatment according to the present invention.
In the drawings, the reference numerals denote the following components:
1. an ozone generator; 2. a water chiller; 3. an oxygen generator; 4. an air compressor; 5. a cold dryer; 6. a power distribution cabinet; 7. the water return prevention tank; 8. a water inlet pump; 9. a bag filter; 10. 1# ozone reaction tower; 11. 2# ozone reaction tower; 12. 3# ozone reaction tower; 13. a water outlet storage tank; 14. discharging the water pump; 15. a kit; 16. a metering pump; 17. an ozone destructor; 18. an electric control cabinet; 19. an ozone inlet; 20. A water inlet; 21. a water outlet; 22. an ozone outlet; 23. a compressed air outlet; 24. a compressed air inlet.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
The application discloses an ozone advanced oxidation system for groundwater in-situ extraction treatment, which comprises an ozone preparation device and an oxidation reaction device, and the schematic diagrams are shown in figures 1 and 2. The ozone preparation device comprises an ozone preparation device and an oxidation reaction device, wherein ozone prepared by the ozone preparation device can be switched to be introduced into an injection well for ozone in-situ oxidation or an ozone reaction tower of the oxidation reaction device at a position of a water return prevention tank of the oxidation reaction device, the ozone reaction tower is filled with a catalyst filler, and the ozone reacts with sewage pumped out to the ozone reaction tower under the catalysis of the catalyst to remove pollutants.
The ozone preparation device comprises an ozone generator 1, an air compressor 4, a refrigeration dryer 5, an oxygen generator 3 and a water cooler 2, compressed air is subjected to two-stage filtration and is dried by the refrigeration dryer, an absorber of the oxygen generator adsorbs nitrogen and carbon dioxide, so that oxygen is enriched in a gas phase, and the oxygen prepared by the oxygen generator is stored in an oxygen buffer tank.
The device of the invention utilizes a Pressure Swing Adsorption (PSA) oxygen generator to prepare oxygen. The raw material used in the ozone preparation device is air, compressed air is filtered by a two-stage filter under the condition of normal temperature, is dehydrated and dried by a cold dryer 5 and then enters a No. 1 adsorber, impurities such as nitrogen, carbon dioxide and the like in the air are adsorbed by a molecular sieve by utilizing PSA technology, oxygen is enriched in gas phase, and flows out from an outlet of an oxygen generator and is stored in an oxygen buffer tank. When the adsorber is operated to reach saturation state, the molecular sieve is decompressed quickly to analyze the adsorbed components, and the 1# adsorber and the 2# adsorber operate alternately to obtain oxygen with purity of about 90-94%.
Qualified gaseous oxygen enters an air inlet pipeline of the ozone generator 1 after being filtered by a grade of 0.01 mu m, an electric regulating valve and a pressure transmitter are respectively arranged on an inlet pipeline and an outlet pipeline, and the pressure of the pipelines is controlled at a given value. If the actual pressure is different from the given pressure, the regulator outputs a signal to regulate the opening of the valve. The pressure of the air outlet pipeline of the ozone generator 1 in the invention is set to be 0.3MPa for meeting the requirement of in-situ injection. Compared with the conventional ozone generator, the pressure is obviously improved, and the shell container of the generator adopts a pressure container design. The stabilized oxygen enters the ozone generating chamber, and partial oxygen in the ozone generating chamber is discharged at high voltage through medium frequency (400-. The discharge tube is the key of the ozone generator, the discharge tube of the device is made of high borosilicate quartz glass, the electrode is made of stainless steel 316, and the discharge reaction elements and the like are correspondingly optimized due to the fact that the reaction pressure is increased, so that the reliability of the long-term operation of the system is improved.
The ozone generator 1 can generate a large amount of heat energy during operation, and in order to ensure the safe operation of the system, the ozone generator 1 is provided with a circulating cooling water jacket outside the discharge tube; the cooling water flows through the jacket to take away the heat generated by the ozone generator 1, so as to achieve the purpose of discharging the heat energy outwards. In addition, the invention is provided with the water cooler 2, circulating water flows out through the water cooler 2, and returns to the water cooler 2 through the cooling water upper water pipe after heat energy is exchanged, so that a circulating system is formed. The circulating liquid is normally deionized water, and in order to prevent freezing in winter, an anti-freezing liquid can also be adopted.
In the embodiment shown in fig. 2, the oxidation reaction apparatus further includes a sewage inlet pump, a bag filter 9, an ozone reaction tower, an ozone destructor 17, and a chemical tank 15, wherein groundwater enters the sewage adjusting tank from the pumping well, sewage enters the ozone reaction tower through the bag filter inlet pump via the inlet pump, and the ozone reaction tower is filled with a catalyst filler. In FIG. 2, 3 ozone reaction towers, 1# ozone reaction tower 11, 2# ozone reaction tower 12 and 3# ozone reaction tower 13 are provided in series.
As an embodiment of the invention, the technical scheme corresponding to the underground water pumping treatment is as follows: the underground water is pumped out from the pumping well and enters a sewage adjusting tank, and then enters a 3-stage ozone reaction tower through a water inlet pump 8. In order to intercept suspended matters in the sewage, a bag filter 9 with the filtering precision of 5 mu m is arranged behind the pump, the ozone reaction tower is of a cylindrical vertical structure, is connected in series at 3 stages, and is made of carbon steel anti-corrosion materials. The titanium steel microporous aeration heads are correspondingly arranged in each reaction tower, and the micro bubbles can not only improve the mass transfer speed of the ozone, but also strengthen the oxidation capacity of the ozone.
Ozone enters the ozone reaction tower from the outlet of the ozone generator 1 through an air supply pipeline. In order to prevent polluted water from flowing back into the ozone generator, a gas-liquid separation water return prevention tank 7 is arranged between the ozone generator 1 and the reaction tower, and is provided with a magnetic turning plate liquid level meter and an emptying electromagnetic valve. The air supply pipeline is arranged at the upper end of the water return prevention tank, when the water return prevention tank operates, if sewage flows back, the sewage flows back to the water return prevention tank, the magnetic turning plate liquid level meter monitors the liquid level in the tank, and when a certain height is reached, the emptying electromagnetic valve is automatically opened to discharge stored water. Ozone enters 3 reaction towers after passing through the water return prevention tank and is released from the aeration disc to contact with water, and bubbles rise slowly due to small particle size of the microbubbles, so that the bubbles have long existence time, large influence range and good mass transfer effect.
Meanwhile, the tower is filled with an ozone catalyst, the ozone catalysis technology also utilizes a large amount of hydroxyl radicals generated in the reaction process to oxidize and decompose organic matters in water, and the addition of the catalyst can accelerate and strengthen the oxidation reaction. Fe is respectively selected in the three reaction towers according to the removal of different pollutants, reaction conditions and the like2+、Fe3+、Mn2+、Ni2+NiO or Al2O3And the like to achieve the best removal effect on pollutants.
The filling amount of the catalyst can be determined by a small test according to water quality, in order to prevent the blockage of the catalyst filler, three branches are arranged behind a compressed air storage tank of the ozone preparation device and are respectively connected to each stage of ozone reaction tower, compressed air is introduced from the bottom of the reaction tower for back washing, a manual ball valve is arranged on each branch, and the manual ball valve can be regulated and controlled according to the actual operation condition.
Because the ozone absorption rate in the reaction tower can not reach 100% due to multiple influences of water quality and the diffusion device, the device adopts a heating catalysis method to carry out secondary treatment on tail gas discharged by the reaction tower. Ozone can decompose within 2S at 350 c but generates a large energy consumption. The ozone destructor is used for continuously heating tail gas and utilizes a catalyst MnO2The decomposition effect is enhanced, and when the temperature reaches 105 ℃, the ozone structure can be destroyed, so that the tail gas reaches the dischargeable standard.
Further, the effluent of the third-stage reaction tower enters an effluent storage tank 13, and is discharged out through an effluent pump 14 or pumped out to an underground water reinjection well. The water outlet storage tank is provided with a magnetic turning plate liquid level meter for low liquid level pump stop protection of the water outlet pump, restart of the pump after the water level in the tank rises to a preset liquid level and the like.
As another embodiment of the invention, when ozone in-situ injection treatment is carried out, the technical scheme is as follows: ozone sets up alone pipeline respectively and inserts each injection well in preventing returning the water pitcher back in addition, and aeration pipe release through injecting into in the well gets into the zone of saturation diffusion, and for better messenger's ozone is in soil and groundwater diffusion, ozone generator outlet pressure passes through pressure transmitter and electric control valve interlocking effect and sets up at 0.3MPa to overcome ozone and pour into the pressure loss of water and soil into time.
In order to uniformly diffuse ozone in a saturated zone and ensure a certain influence radius, the invention adopts a mode of introducing compressed air into an injection well. The rear side of a compressed air storage tank of the ozone preparation device is provided with a branch to be connected to a rear air supply pipeline of the anti-return water tank, compressed air and ozone are injected alternately, and the diffusion range of the ozone is enhanced through the disturbance of the compressed air.
According to the invention, the agent box 15 and the metering pump are arranged in the oxidation reaction device, the agent in the agent box is preferably hydrogen peroxide, the ozone and the hydrogen peroxide are cooperated for synergistic oxidation, the generation of hydroxyl free radicals can be promoted by adding the hydrogen peroxide, compared with the single ozone oxidation process, the final degradation products of organic matters are carbon dioxide and water, the degradation speed can be obviously improved, and no secondary pollution is generated.
In the invention, the ozone preparation device is integrated in a single container, and the oxidation reaction device is integrated on the skid-mounted platform, so that the convenience of operation is improved.
Compared with the defects and shortcomings of the prior art, the ozone advanced oxidation system for in-situ pumping treatment of underground water provided by the invention has the advantages of reasonable structure and convenience in operation, can flexibly switch the treatment modes of in-situ injection and pumping treatment according to different site conditions, and obviously improves the treatment efficiency of the ozone oxidation process for repairing underground water pollution.
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.
Claims (12)
1. The utility model provides an ozone advanced oxidation system for groundwater normal position, take out processing which characterized in that, includes ozone preparation facilities and oxidation reaction unit, ozone that ozone preparation facilities prepared can switch over at oxidation reaction unit's anti-return water jar department and lets in the injection well and carry out ozone normal position oxidation or let in the ozone reaction tower of oxidation reaction unit, and the ozone reaction tower is filled catalyst filler, and ozone reacts with the sewage of taking out to the ozone reaction tower in order to get rid of the pollutant under the catalysis of catalyst.
2. The ozone advanced oxidation system as claimed in claim 1,
the ozone preparation device comprises an ozone generator, an air compressor, a refrigeration dryer and an oxygen generator, compressed air prepared by the air compressor is filtered in two stages and is stored in a compressed air storage tank after being dried by the refrigeration dryer, the compressed air in the compressed air storage tank is sent to the oxygen generator, an adsorber of the oxygen generator adsorbs nitrogen and carbon dioxide, so that oxygen is enriched in a gas phase, the oxygen prepared by the oxygen generator is stored in an oxygen cache tank, and the oxygen in the oxygen cache tank enters the ozone generator to prepare ozone.
3. The ozone advanced oxidation system as claimed in claim 1 or 2,
the oxidation reaction device comprises a water inlet pump, a bag filter and an ozone reaction tower, underground water enters a sewage adjusting tank from a water pumping well, the effluent of the sewage adjusting tank enters the ozone reaction tower through the bag filter through the water inlet pump, and catalyst filler is filled in the ozone reaction tower.
4. The ozone advanced oxidation system as claimed in claim 2, wherein the ozone generator generates ozone by discharging oxygen gas produced by the oxygen generator through medium-frequency high-voltage discharge, and discharge tubes of the ozone generator are made of high borosilicate silica glass material.
5. The ozone advanced oxidation system as claimed in claim 4, wherein the ozone preparation device further comprises a water chiller, a circulating cooling water jacket is arranged outside the discharge tube, and a pipeline of the circulating cooling water jacket is communicated with the water chiller.
6. The advanced ozone oxidation system as claimed in claim 1, 2 or 3, wherein the ozone supply pipeline is arranged at the upper end of the water return prevention tank, the water return prevention tank is provided with a magnetic turning plate liquid level meter and an emptying solenoid valve, the magnetic turning plate liquid level meter monitors the liquid level in the tank, and the emptying solenoid valve is automatically opened to discharge the stored water reaching the set height.
7. The ozone advanced oxidation system as claimed in claim 1, 2 or 3, wherein the compressed air produced by the air compressor of the ozone production apparatus is alternately introduced into the injection well with ozone to enhance the ozone diffusing capability.
8. The ozone advanced oxidation system as claimed in claim 1, 2 or 3, wherein the oxidation reaction device further comprises a chemical tank, wherein the chemical in the chemical tank is hydrogen peroxide, and the chemical can be switched and added to the ozone reaction tower or the injection well according to the requirement.
9. The ozone advanced oxidation system according to claim 1, 2 or 3, wherein the number of the ozone reaction towers is plural, and they are arranged in series; the inside of ozone reaction tower sets up micropore aeration head, the microbubble that micropore aeration head produced can improve the mass transfer speed of ozone, strengthens ozone's oxidizing power.
10. The ozone advanced oxidation system as claimed in claim 1, 2 or 3, wherein the packing material filled in the ozone reaction tower is ozone catalyst, and Fe is selected according to different pollutants to be removed and reaction conditions2+、Fe3+、Mn2+、Ni2+NiO or Al2O3And the like.
11. The ozone advanced oxidation system as claimed in claim 1, 2 or 3, wherein the oxidation reaction device further comprises an ozone destructor connected with the ozone reaction tower, the ozone destructor using a catalyst MnO2The ozone not used in the ozone reaction tower is destroyed by heating at a high temperature of 105 ℃.
12. The ozone advanced oxidation system as claimed in claim 1, 2 or 3, wherein when the ozone prepared by the ozone preparation device is introduced into the injection well through the anti-return water tank of the oxidation reaction device for ozone in-situ oxidation, the pressure of the outlet pipeline of the ozone preparation device is set at 0.3MPa so as to overcome the pressure loss of water and soil during ozone injection.
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