CN113387486A - Device and method for removing COD (chemical oxygen demand) in polychlorotrifluoroethylene wastewater - Google Patents
Device and method for removing COD (chemical oxygen demand) in polychlorotrifluoroethylene wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 145
- -1 polychlorotrifluoroethylene Polymers 0.000 title claims abstract description 53
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 title claims abstract description 51
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000126 substance Substances 0.000 title claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 6
- 239000001301 oxygen Substances 0.000 title claims description 6
- 229910052760 oxygen Inorganic materials 0.000 title claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
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- 230000015843 photosynthesis, light reaction Effects 0.000 claims abstract description 37
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000003647 oxidation Effects 0.000 claims abstract description 23
- 238000001179 sorption measurement Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 11
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000010517 secondary reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 102000005393 Sodium-Potassium-Exchanging ATPase Human genes 0.000 abstract 1
- 108010006431 Sodium-Potassium-Exchanging ATPase Proteins 0.000 abstract 1
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 239000000178 monomer Substances 0.000 description 4
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
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- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
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- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/302—Treatment of water, waste water, or sewage by irradiation with microwaves
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
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- C02F2001/007—Processes including a sedimentation step
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- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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Abstract
本发明公开了一种去除聚三氟氯乙烯废水中COD的装置和方法，该装置包括废水池、废水输送泵、过滤器、微孔过滤器、双氧水计量罐、双氧水计量泵、微混合器、微波无极紫外UV光解废水净化器、连续式超级氧化二级反应器、多相流泵、高铁酸钾溶液计量罐、高铁酸钾溶液计量泵、微反应器、中间水池、中间水池提升泵、活性炭吸附装置、气液接触冷却器、回用水池、空压机，通过该装置对聚三氟氯乙烯废水进行处理，进行UV光解协同微波、双氧水、臭氧对废水中的COD进行超级氧化，并通过活性炭吸附装置吸收少量剩余COD，处理后的废水COD降至20~60mg/L，可进行循环利用。本发明方法工艺先进，连续运行、效果好，可广泛应用于聚三氟氯乙烯废水的处理。
The invention discloses a device and method for removing COD in polychlorotrifluoroethylene wastewater. The device comprises a wastewater tank, a wastewater conveying pump, a filter, a microporous filter, a hydrogen peroxide metering tank, a hydrogen peroxide metering pump, a micro mixer, Microwave electrodeless ultraviolet UV photolysis wastewater purifier, continuous super oxidation secondary reactor, multiphase flow pump, potassium ferrate solution metering tank, potassium ferrate solution metering pump, microreactor, intermediate pool, intermediate pool lift pump, Activated carbon adsorption device, gas-liquid contact cooler, reuse pool, air compressor, through which the polychlorotrifluoroethylene wastewater is treated, and UV photolysis is carried out in conjunction with microwave, hydrogen peroxide and ozone to super-oxidize COD in wastewater, A small amount of remaining COD is absorbed by the activated carbon adsorption device, and the COD of the treated wastewater is reduced to 20~60mg/L, which can be recycled. The method of the invention has advanced technology, continuous operation and good effect, and can be widely used in the treatment of polychlorotrifluoroethylene wastewater.
Description
Technical Field
The invention belongs to the technical field of organic wastewater treatment, and particularly relates to a device and a method for removing COD (chemical oxygen demand) in polychlorotrifluoroethylene wastewater.
Background
Polychlorotrifluoroethylene (PCTFE), the earliest developed and commercialized fluoropolymer. Polychlorotrifluoroethylene is generated by polymerizing chlorotrifluoroethylene through free radicals (initiated by taking peroxide as an initiator or a redox system), can be prepared by methods such as suspension polymerization, solution polymerization, emulsion polymerization and the like, has excellent chemical stability, electrical barrier property and weather resistance, and is widely applied to high and new technical fields such as national defense and military industry, electronic information, chemical industry, pharmacy, mechanical manufacturing and the like. At present, domestic polychlorotrifluoroethylene resin is mainly produced by a suspension method, in a polymerization kettle with a stirrer, chlorotrifluoroethylene monomer is suspended and dispersed in a water phase in a micro-droplet shape, an added oil-soluble initiator is dissolved in the monomer, polymerization reaction is carried out in the micro-droplet, and in order to ensure that the micro-droplet is dispersed in water in a bead shape, a suspension stabilizer is required to be added. After the polymerization reaction is finished, the chlorotrifluoroethylene monomer which is not completely reacted enters a monomer recovery storage tank, the generated polychlorotrifluoroethylene resin enters a stamping and washing kettle, and the finished resin is obtained after the processes of stamping, washing, dewatering, drying and the like, and the wastewater discharged in the production process is polychlorotrifluoroethylene wastewater.
As most of the addition agents such as the initiator, the suspension stabilizer and the like added in the production process of the polychlorotrifluoroethylene by the suspension method are toxic and difficult to biologically degrade, a certain amount of organic pollutants (COD) is contained in the polychlorotrifluoroethylene wastewater, and the organic pollutants bring adverse effects on the recycling of the wastewater and the regional ecological environment, the wastewater needs to be treated in the production of the polychlorotrifluoroethylene by the suspension method so as to remove the COD in the wastewater, thereby having important significance.
Disclosure of Invention
Aiming at the problem that organic pollutants in polychlorotrifluoroethylene wastewater are difficult to degrade in the prior art, the invention provides a device and a method for removing COD in polychlorotrifluoroethylene wastewater, which can effectively remove COD in polychlorotrifluoroethylene wastewater and realize cyclic utilization of wastewater.
The invention is realized by the following technical scheme:
a device for removing COD (chemical oxygen demand) in polychlorotrifluoroethylene wastewater comprises a wastewater pool, a wastewater delivery pump, a filter, a microporous filter, a hydrogen peroxide metering tank, a hydrogen peroxide metering pump, a micromixer, a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier, a continuous super oxidation secondary reactor, a multiphase flow pump, a potassium ferrate solution metering tank, a potassium ferrate solution metering pump, a microreactor, an intermediate water pool lifting pump, an active carbon adsorption device, a gas-liquid contact cooler, a reuse water pool and an air compressor;
a water inlet pipe passage is arranged in the continuous super-oxidation secondary reactor; the upper end of the microwave electrodeless ultraviolet UV photolysis wastewater purifier is provided with an air inlet and an air outlet, the air inlet is connected with an air compressor, the air outlet is connected with a multiphase flow pump, a water outlet is arranged below the air outlet and is connected with a water inlet pipe channel in the continuous super-oxidation secondary reactor, and a water inlet pipe channel in the super-oxidation secondary reactor is connected with the multiphase flow pump; the wastewater pool is connected with the filter and the microporous filter in sequence through a wastewater input pump; the micro mixer is respectively connected with the microporous filter and the microwave electrodeless ultraviolet UV photolysis wastewater purifier and is connected with the hydrogen peroxide metering tank through a hydrogen peroxide metering pump; the lower end of the micro-reactor is respectively connected with a multiphase flow pump and a potassium ferrate solution metering pump, the potassium ferrate solution metering pump is connected with a potassium ferrate solution metering tank, and the upper end of the micro-reactor is connected with the lower end of the continuous super-oxidation secondary reactor; the upper end of the continuous super-oxidation secondary reactor is provided with a water outlet connected with an intermediate water tank, the intermediate water tank is connected with an active carbon adsorption device through an intermediate water tank lifting pump, and the active carbon adsorption device is sequentially connected with a gas-liquid contact cooler and a reuse water tank.
Further, the filter is a pneumatic self-cleaning filter.
Further, the microwave electrodeless ultraviolet UV photolysis wastewater purifier is provided with a microwave generator, an ultraviolet lamp power supply and a microwave electrodeless ultraviolet lamp; the microwave electrodeless ultraviolet UV photolysis wastewater purifier mainly generates ultraviolet light with the wavelengths of 254nm and 185 nm.
Furthermore, the pore diameter of the filter is 30 μm, and the pore diameter of the microporous filter is 0.1 μm.
Furthermore, the continuous super-oxidation secondary reactor is filled with polypropylene stepped ring packing.
In the invention, the method for removing COD in the polychlorotrifluoroethylene wastewater by using the device comprises the following steps:
(1) discharging polychlorotrifluoroethylene wastewater into a wastewater pool, precipitating part of polychlorotrifluoroethylene resin particles in the wastewater pool by a sedimentation method, then conveying the wastewater from the wastewater pool to a filter by a wastewater conveying pump for primary filtration, feeding the filtered wastewater into a microporous filter for secondary filtration, feeding the secondary filtered wastewater into a micro mixer for mixing with hydrogen peroxide from a hydrogen peroxide metering tank pumped by a hydrogen peroxide metering pump;
(2) the method comprises the following steps that (1) a mixture of wastewater and hydrogen peroxide in a micro mixer enters a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier, compressed air for cooling a microwave electrodeless UV lamp tube and generated ozone simultaneously enter the microwave electrodeless UV photolysis wastewater purifier, and UV photolysis is performed to perform super oxidation on COD in the wastewater in cooperation with the microwave, the hydrogen peroxide and the ozone;
(3) the wastewater treated by the super oxidation in the step (2) overflows into a water inlet pipeline of the continuous super oxidation secondary reactor through a water outlet of the microwave electrodeless ultraviolet photolysis wastewater purifier and enters into a multiphase flow pump through the water inlet pipeline, unreacted gas of the microwave electrodeless ultraviolet UV photolysis wastewater purifier also enters into the multiphase flow pump through a gas outlet at the upper end of the microwave electrodeless ultraviolet UV photolysis wastewater purifier and jointly enters into a microreactor, meanwhile, potassium ferrate in a potassium ferrate solution metering tank also enters into the microreactor through a potassium ferrate solution metering pump to further oxidize C0D in the polychlorotrifluoroethylene wastewater, the wastewater treated by the microreactor enters into the continuous super oxidation secondary reactor from the lower port of the continuous super oxidation secondary reactor and overflows into an intermediate water tank through a water outlet at the upper end of the continuous super oxidation secondary reactor,
(4) and (4) allowing the wastewater in the intermediate water tank in the step (3) to enter an activated carbon adsorption device through an intermediate water tank lifting pump, adsorbing a small amount of residual COD, cooling to 25-35 ℃ through a gas-liquid contact cooler, and allowing the wastewater to enter a reuse water tank.
Further, the polychlorotrifluoroethylene wastewater is wastewater generated in the production process of polychlorotrifluoroethylene by a suspension method.
Furthermore, the flow of the compressed air for cooling the microwave electrodeless Ultraviolet (UV) lamp tube is 2-4 m3And h, cooling the microwave electrodeless ultraviolet lamp by the compressed air, generating ozone under the irradiation of 185nm ultraviolet rays, and feeding the ozone into the microwave electrodeless ultraviolet photolysis purifier.
Further, the volume concentration of the hydrogen peroxide in the step (1) is 27%, and the mass ratio of the added amount of the hydrogen peroxide to the wastewater is 1: 40-50; the concentration of the potassium ferrate solution in the step (3) is 1%, the proportion of the addition amount of the 1% potassium ferrate solution to the wastewater is 1 g-3 g:1L of the compound.
Further, the temperature of the polychlorotrifluoroethylene wastewater is 50-85 ℃.
Advantageous effects
The invention solves the problem of organic pollutants contained in the polychlorotrifluoroethylene wastewater by treating the wastewater generated in the production of polychlorotrifluoroethylene by a suspension method, can effectively remove COD in the polychlorotrifluoroethylene wastewater, realizes the cyclic utilization of the wastewater and simultaneously avoids the pollution of the organic pollutants to the environment. The invention has advanced and continuous operation, good effect and easy implementation, and can be widely applied to the polychlorotrifluoroethylene wastewater treatment process, in particular to the removal of COD in the polychlorotrifluoroethylene wastewater by the suspension method.
Drawings
FIG. 1 is a schematic view of an apparatus for removing COD from polychlorotrifluoroethylene wastewater according to the present invention;
wherein, 1 is a wastewater pool, 2 is a wastewater delivery pump, 3 is a filter, 4 is a microporous filter, 5 is a hydrogen peroxide metering tank, 6 is a hydrogen peroxide metering pump, 7 is a micromixer, 8 is a microwave electrodeless ultraviolet UV photolysis wastewater purifier, 9 is a continuous super oxidation secondary reactor, 10 is a multiphase flow pump, 11 is a potassium ferrate solution metering tank, and 12 is a potassium ferrate solution metering pump. 13 is a micro-reactor, 14 is an intermediate water tank, 15 is an intermediate water tank lift pump, 16 is an activated carbon adsorption device, 17 is a gas-liquid contact cooler, 18 is a reuse water tank, and 19 is an air compressor.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description is provided clearly and completely, and other similar embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application based on the embodiments in the present application.
A device for removing COD in polychlorotrifluoroethylene wastewater is shown in figure 1, and comprises a wastewater pool 1, a wastewater delivery pump 2, a pneumatic self-cleaning filter 3 (with the aperture of 30 microns), a microporous filter 4 (with the aperture of 0.1 micron), a hydrogen peroxide metering tank 5, a hydrogen peroxide metering pump 6, a micro-mixer 7, a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier 8, a continuous super oxidation secondary reactor 9, a multiphase flow pump 10, a potassium ferrate solution metering tank 11, a potassium ferrate solution metering pump 12, a micro-reactor 13, an intermediate water pool 14, an intermediate water pool lifting pump 15, an activated carbon adsorption device 16, a gas-liquid contact cooler 17, a reuse water pool 18 and an air compressor 19;
wherein, a water inlet pipe channel and a polypropylene stepped ring packing are arranged in the continuous super oxidation secondary reactor 9; a microwave generator, an ultraviolet lamp power supply and a microwave electrodeless Ultraviolet (UV) lamp are arranged in the microwave electrodeless UV photolysis wastewater purifier 8, an air inlet and an air outlet are arranged at the upper end of the microwave electrodeless UV lamp, the air inlet is connected with an air compressor 19, the air outlet is connected with a multiphase flow pump 10, a water outlet is arranged at the lower end of the air outlet and is connected with a water inlet pipe channel in the continuous super-oxidation secondary reactor 9, and a water inlet pipe channel in the super-oxidation secondary reactor is connected with the multiphase flow pump; the wastewater pool 1 is connected with a filter 3 and a microporous filter 4 in sequence through a wastewater input pump 2; the micro mixer 7 is respectively connected with the microporous filter 4 and the microwave electrodeless ultraviolet UV photolysis wastewater purifier 8, and is connected with the hydrogen peroxide metering tank 5 through the hydrogen peroxide metering pump 6; the lower end of the micro-reactor 13 is respectively connected with a multiphase flow pump 10 and a potassium ferrate solution metering pump 12, the potassium ferrate solution metering pump 12 is connected with a potassium ferrate solution metering tank 11, and the upper end of the micro-reactor 13 is connected with the lower end of the continuous super-oxidation secondary reactor 9; the super-oxidation secondary reactor 9 is connected with an intermediate water tank 14 through an overflow port, the intermediate water tank 14 is connected with an active carbon adsorption device 16 through an intermediate water tank lifting pump 15, and the active carbon adsorption device 16 is sequentially connected with a gas-liquid contact cooler 17 and a reuse water tank 18.
The device shown in FIG. 1 is used for treating wastewater generated in the production process of polychlorotrifluoroethylene by a suspension method, and the specific operations are as follows:
example 1
(1) Discharging waste water (70 ℃) generated in the production process of polychlorotrifluoroethylene by a suspension method into a waste water tank 1, precipitating partial polychlorotrifluoroethylene resin particles in the waste water tank 1 by a sedimentation method, then conveying the waste water from the waste water tank 1 into a filter 3 by a waste water conveying pump 2, carrying out primary filtration, filtering out solid particles with the particle size of more than 30 micrometers, feeding the filtered waste water into a microporous filter 4 for secondary filtration, filtering out suspended matters with the particle size of more than 0.1 micrometer, feeding the secondary filtered waste water into a micro mixer 7, and mixing the secondary filtered waste water with hydrogen peroxide in a hydrogen peroxide metering tank 5 pumped in by a hydrogen peroxide metering pump 6, wherein the volume concentration of the hydrogen peroxide is 27%, and 22.49kg of 27% hydrogen peroxide is added into each ton of waste water;
(2) the mixture of the wastewater and the hydrogen peroxide in the micro mixer 7 in the step (1) enters a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier 8, and simultaneously compressed air for cooling a microwave electrodeless UV lamp tube and generated ozone (ozone generated by the compressed air generated by an air compressor 19 under the irradiation of 185nm ultraviolet light while cooling the microwave electrodeless UV lamp tube) enter the microwave electrodeless UV photolysis wastewater purifier together to perform UV photolysis and super oxidation on COD (chemical oxygen demand) in the wastewater by the aid of the microwave, the hydrogen peroxide and the ozone, wherein the flow of the compressed air for cooling the microwave electrodeless UV lamp tube is 2m3/h；
(3) The wastewater treated by the super oxidation in the step (2) overflows into a water inlet pipeline of a continuous super oxidation secondary reactor 9 through a water outlet at the upper end of a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier 8 and enters a multiphase flow pump 10 through the water inlet pipeline, unreacted gas of the microwave electrodeless UV photolysis wastewater purifier 8 also enters the multiphase flow pump 10 through a gas outlet in the microwave electrodeless UV photolysis wastewater purifier 8 and then jointly enters a microreactor 13, meanwhile, potassium ferrate (the mass percentage concentration is 1%) in a potassium ferrate solution metering tank 11 also enters the microreactor 13 through a potassium ferrate solution metering pump 12 (the ratio of the addition amount of 1% of the potassium ferrate solution to the wastewater is 1g: 1L), C0D in the polychlorotrifluoroethylene wastewater is further oxidized in the microreactor 13, and then the wastewater treated by the microreactor 13 enters a super oxidation secondary reaction from a lower end port of the continuous super oxidation secondary reactor 9 In the device 9, overflowing into an intermediate water tank 14 through a water outlet at the upper end of the continuous super-oxidation secondary reactor 9;
(4) and (4) the wastewater in the intermediate water tank 14 in the step (3) enters an activated carbon adsorption device 16 through an intermediate water tank lifting pump 15, a small amount of residual COD is adsorbed, then the temperature is reduced to 25 ℃ through a gas-liquid contact cooler 17, and then the wastewater enters a reuse water tank 18.
Example 2
Example 2 is different from example 1 in that the compressed air flow rate for cooling the microwave electrodeless ultraviolet UV photolysis wastewater purifier is 3 m/h.
Example 3
Example 3 is different from example 1 in that compressed air flow rate for cooling of the microwave electrodeless ultraviolet UV photolysis wastewater purifier is 4 m/h.
Example 4
Example 4 differs from example 1 in that 1% potassium ferrate solution is added in a 2g to 1L ratio to the waste water.
Example 5
Example 5 differs from example 1 in that 1% potassium ferrate solution is added in a 3g to 1L ratio to the waste water.
The COD concentration of the polychlorotrifluoroethylene wastewater treated in the embodiments 1 to 5 is shown in the following table 1, and as shown in the table 1, the COD concentration of the wastewater treated by the device and the method is reduced to 20 to 60mg/L, and the wastewater can be recycled after entering a reuse water pool.
TABLE 1 examples 1-5 COD concentration before and after polychlorotrifluoroethylene wastewater treatment
Claims (10)
1. A device for removing COD (chemical oxygen demand) in polychlorotrifluoroethylene wastewater is characterized by comprising a wastewater pool, a wastewater delivery pump, a filter, a microporous filter, a hydrogen peroxide metering tank, a hydrogen peroxide metering pump, a micro mixer, a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier, a continuous super oxidation secondary reactor, a multiphase flow pump, a potassium ferrate solution metering tank, a potassium ferrate solution metering pump, a microreactor, an intermediate water pool lifting pump, an activated carbon adsorption device, a gas-liquid contact cooler, a reuse water pool and an air compressor;
a water inlet pipe passage is arranged in the continuous super-oxidation secondary reactor;
the upper end of the microwave electrodeless ultraviolet UV photolysis wastewater purifier is provided with an air inlet and an air outlet, the air inlet is connected with an air compressor, the air outlet is connected with a multiphase flow pump, a water outlet is arranged below the air outlet and is connected with a water inlet pipe channel in the continuous super-oxidation secondary reactor, and a water inlet pipe channel in the super-oxidation secondary reactor is connected with the multiphase flow pump;
the wastewater pool is connected with the filter and the microporous filter in sequence through a wastewater input pump;
the micro mixer is respectively connected with the microporous filter and the microwave electrodeless ultraviolet UV photolysis wastewater purifier and is connected with the hydrogen peroxide metering tank through a hydrogen peroxide metering pump;
the lower end of the micro-reactor is respectively connected with a multiphase flow pump and a potassium ferrate solution metering pump, the potassium ferrate solution metering pump is connected with a potassium ferrate solution metering tank, and the upper end of the micro-reactor is connected with the lower end of the continuous super-oxidation secondary reactor;
the upper end of the continuous super-oxidation secondary reactor is provided with a water outlet connected with an intermediate water tank, the intermediate water tank is connected with an active carbon adsorption device through an intermediate water tank lifting pump, and the active carbon adsorption device is sequentially connected with a gas-liquid contact cooler and a reuse water tank.
2. The apparatus of claim 1, wherein the filter is a pneumatic self-cleaning filter.
3. The apparatus according to claim 1, wherein the microwave electrodeless ultraviolet UV photolysis wastewater purifier is provided with a microwave generator, an ultraviolet lamp power supply and a microwave electrodeless ultraviolet lamp.
4. The apparatus of claim 3, wherein the microwave electrodeless ultraviolet UV photolysis wastewater purifier's microwave electrodeless ultraviolet lamp produces primarily UV light at wavelengths of 254nm and 185 nm.
5. The device of claim 1, wherein the filter has a pore size of 30 μm and the microporous filter has a pore size of 0.1 μm; the continuous super-oxidation secondary reaction is filled with polypropylene stepped ring packing.
6. A method for removing COD in polychlorotrifluoroethylene wastewater by using the apparatus of any one of claims 1 to 5, comprising the steps of:
(1) discharging polychlorotrifluoroethylene wastewater into a wastewater pool, precipitating part of polychlorotrifluoroethylene resin particles in the wastewater pool by a sedimentation method, then conveying the wastewater from the wastewater pool to a filter by a wastewater conveying pump for primary filtration, feeding the filtered wastewater into a microporous filter for secondary filtration, feeding the secondary filtered wastewater into a micro mixer for mixing with hydrogen peroxide from a hydrogen peroxide metering tank pumped by a hydrogen peroxide metering pump;
(2) the method comprises the following steps that (1) a mixture of wastewater and hydrogen peroxide in a micro mixer enters a microwave electrodeless Ultraviolet (UV) photolysis wastewater purifier, compressed air for cooling a microwave electrodeless UV lamp tube and generated ozone simultaneously enter the microwave electrodeless UV photolysis wastewater purifier, and UV photolysis is performed to perform super oxidation on COD in the wastewater in cooperation with the microwave, the hydrogen peroxide and the ozone;
(3) the wastewater treated by the super oxidation in the step (2) overflows into a water inlet pipeline of the continuous super oxidation secondary reactor through a water outlet of the microwave electrodeless ultraviolet photolysis wastewater purifier and enters into a multiphase flow pump through the water inlet pipeline, unreacted gas of the microwave electrodeless ultraviolet UV photolysis wastewater purifier also enters into the multiphase flow pump through a gas outlet at the upper end of the microwave electrodeless ultraviolet UV photolysis wastewater purifier and jointly enters into a microreactor, meanwhile, potassium ferrate in a potassium ferrate solution metering tank also enters into the microreactor through a potassium ferrate solution metering pump to further oxidize C0D in the polychlorotrifluoroethylene wastewater, the wastewater treated by the microreactor enters into the continuous super oxidation secondary reactor from the lower port of the continuous super oxidation secondary reactor and overflows into an intermediate water tank through a water outlet at the upper end of the continuous super oxidation secondary reactor,
(4) and (4) allowing the wastewater in the intermediate water tank in the step (3) to enter an activated carbon adsorption device through an intermediate water tank lifting pump, adsorbing a small amount of residual COD, cooling to 25-35 ℃ through a gas-liquid contact cooler, and allowing the wastewater to enter a reuse water tank.
7. The method for removing COD from polychlorotrifluoroethylene wastewater according to claim 6, wherein the polychlorotrifluoroethylene wastewater is wastewater generated in the production process of polychlorotrifluoroethylene by a suspension method.
8. The method for removing COD from polychlorotrifluoroethylene wastewater according to claim 6, wherein the flow rate of the compressed air for cooling the microwave electrodeless ultraviolet UV lamp tube is 2 to 4m3/h。
9. The method for removing COD in polychlorotrifluoroethylene wastewater according to claim 6, wherein the volume concentration of hydrogen peroxide in step (1) is 27%, and the mass ratio of the added amount of hydrogen peroxide to wastewater is 1: 40-50; the concentration of the potassium ferrate solution in the step (3) is 1%, the proportion of the addition amount of the 1% potassium ferrate solution to the wastewater is 1 g-3 g:1L of the compound.
10. The method for removing COD in polychlorotrifluoroethylene wastewater according to claim 6, wherein the temperature of the polychlorotrifluoroethylene wastewater is 50 to 85 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115569645A (en) * | 2022-10-19 | 2023-01-06 | 广东佳纳能源科技有限公司 | Method and device for regenerating activated carbon |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115569645A (en) * | 2022-10-19 | 2023-01-06 | 广东佳纳能源科技有限公司 | Method and device for regenerating activated carbon |
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