CN115367959A - Wastewater treatment device for ozone/hydrogen peroxide synergistic oxidation coupling biochemical tank - Google Patents
Wastewater treatment device for ozone/hydrogen peroxide synergistic oxidation coupling biochemical tank Download PDFInfo
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- CN115367959A CN115367959A CN202211008409.9A CN202211008409A CN115367959A CN 115367959 A CN115367959 A CN 115367959A CN 202211008409 A CN202211008409 A CN 202211008409A CN 115367959 A CN115367959 A CN 115367959A
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title claims abstract description 192
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 230000003647 oxidation Effects 0.000 title claims abstract description 76
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 76
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 24
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 10
- 230000008878 coupling Effects 0.000 title claims abstract description 7
- 238000010168 coupling process Methods 0.000 title claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000009826 distribution Methods 0.000 claims abstract description 72
- 239000002351 wastewater Substances 0.000 claims abstract description 57
- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 239000000945 filler Substances 0.000 claims description 22
- 238000005192 partition Methods 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 239000007800 oxidant agent Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000002147 killing effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010525 oxidative degradation reaction Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
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- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
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- 244000005700 microbiome Species 0.000 description 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 125000000018 nitroso group Chemical group N(=O)* 0.000 description 1
- 125000005245 nitryl group Chemical group [N+](=O)([O-])* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/722—Oxidation by peroxides
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a wastewater treatment device for an ozone/hydrogen peroxide synergistic oxidation coupling biochemical pool, which comprises a hydrogen peroxide/ozone combined oxidation pool with a long structure, wherein the inside of the hydrogen peroxide/ozone combined oxidation pool is divided into a plurality of communicated reaction units by a plurality of pairs of flow plates; an ozone distribution pipe and a plurality of ozone distribution disks are arranged below each reaction unit, and the openings of the ozone distribution disks are upward; a water distribution pipe and a plurality of water distribution nozzles are arranged below the reaction unit at the head end position, and the openings of the water distribution nozzles face downwards and are opposite to the ozone distribution plate; the water distribution pipe is connected with a wastewater-hydrogen peroxide mixing pressure pump; the ozone distribution pipes of the reaction units at the head end are connected with an ozone generator, the ozone distribution pipes of the other reaction units are connected with an ozone recovery pipe, and the ozone recovery pipe is used for collecting unreacted ozone; the biochemical tank is connected with the water outlet side of the hydrogen peroxide/ozone combined oxidation tank, and the reaction unit at the tail end is also provided with an ozone removal device. The invention overcomes the difficult problem that the wastewater treated by ozone is difficult to be directly biochemical, and can effectively reduce the COD and TN values of the wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment device with an ozone/hydrogen peroxide synergistic oxidation coupling biochemical pool.
Background
Most of industrial wastewater is non-biodegradable and high-concentration organic polluted wastewater, and the wastewater generally has the characteristics of complex components, high chromaticity, toxicity, harm and the like. After the industrial wastewater enters the wastewater treatment plant of the industrial park, the production tail water still can hardly stably and strictly reach the discharge standard though the traditional treatment process of secondary biochemistry, coagulating sedimentation, filtering and disinfection is carried out. The advanced treatment of the waste water plant at present adopts an activated carbon adsorption method, a membrane separation method, an ozone advanced oxidation method, a biomembrane treatment method and the like, wherein an ozone advanced oxidation and biochemical pond is a more advanced treatment method, ozone is used as a strong oxidant, can be used for removing organic matters which are difficult to biochemically degrade in water, and ozone is reduced to form nontoxic and harmless oxygen, thereby being beneficial to improving the biodegradability of the sewage and the waste water and avoiding the problem of secondary pollution of the sewage and the waste water. The biochemical tank utilizes the filtering effect of the filler, saves the occupied area of the reaction tank, has stronger adaptability to the sudden change of the water quality and the water quantity of the wastewater, and can bear higher impact load of organic pollutants. In order to reduce the pollution and impact of the sewage and wastewater with high organic content on the biochemical pool, the organic content in the sewage and wastewater needs to be oxidized and degraded.
However, in practical applications, ozone oxidation also has some problems, mainly represented by the following two aspects: firstly, the defects of strong ozone oxidation selectivity, low oxidation efficiency, unstable effect and the like cause higher investment and operation cost; and secondly, for wastewater containing various refractory organic matters, a single type of catalyst cannot completely remove or degrade the organic matters, and ideal biochemical performance required by subsequent biological filtration cannot be achieved. However, the oxidized sewage and wastewater still need to be treated by a biological reaction tank, and the residual oxidant, especially ozone, has strong killing performance on almost all microorganisms. Therefore, how to combine the ozone strong oxidation decomposition of organic matters and the biological degradation technology is a technical problem to be solved urgently.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a wastewater treatment device for coupling an ozone/hydrogen peroxide synergistic oxidation biochemical pool, which combines technologies of oxidizing organic matters by hydrogen peroxide, oxidizing organic matters by ozone, a biochemical pool and the like, firstly adopts ozone/hydrogen peroxide synergistic oxidation to reduce the molecules of the organic matters in the wastewater with high organic matters, has biodegradability, and then utilizes the biotechnology to further reduce the COD and TN values of the wastewater.
(II) technical scheme
In order to achieve the above object, the present invention provides a wastewater treatment apparatus for an ozone/hydrogen peroxide synergistic oxidation coupling biochemical tank, comprising:
the hydrogen peroxide/ozone combined oxidation pond is internally divided into N +1 mutually communicated reaction units by N pairs of convection plates, wherein N is an integer more than or equal to 2; an ozone distribution pipe and a plurality of ozone distribution disks arranged on the ozone distribution pipe are arranged below each reaction unit, and the openings of the ozone distribution disks are upward; a water distribution pipe and a plurality of water distribution nozzles arranged on the water distribution pipe are also arranged below the reaction unit at the head end position, and the openings of the water distribution nozzles face downwards and are just opposite to the ozone gas distribution plate; the water distribution pipe is connected with a wastewater-hydrogen peroxide mixing pressure pump;
the ozone distribution pipe of the reaction unit positioned at the head end is connected with an ozone generator; the ozone distribution pipes of the other reaction units are connected with an ozone recovery pipe, and the ozone recovery pipe is connected to the top end of the hydrogen peroxide/ozone combined oxidation pond and used for collecting the unreacted ozone; the biochemical tank is connected to the water outlet side of the hydrogen peroxide/ozone combined oxidation tank, and the reaction unit at the tail end is also provided with an ozone removal device.
According to a preferred embodiment of the invention, the biochemical tank comprises an aerobic tank and an anaerobic tank, the aerobic tank is connected with the hydrogen peroxide/ozone combined oxidation tank, and the anaerobic tank is arranged on the water outlet side of the aerobic tank.
According to the preferred embodiment of the invention, the aerobic tank is internally provided with aerobic nitrification biological filler with the filling rate of 40-50%, and the anaerobic tank is filled with anaerobic denitrification biological filler with the filling rate of 50-60%.
According to the preferred embodiment of the present invention, the ozone removing device is composed of an ultraviolet irradiation lamp, a stirrer and an air extractor; and decomposing ozone dissolved in the wastewater by using an ultraviolet irradiation lamp, and discharging the gas gathered above the reaction unit by using an air extractor. Preferably, the air extractor is connected to the waste incinerator.
According to the preferred embodiment of the invention, each pair of baffle plates consists of a front baffle plate and a rear baffle plate, the lower end of the front baffle plate is fixed on the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the front baffle plate is spaced from the top plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the rear baffle plate is fixed on the top plate of the hydrogen peroxide/ozone combined oxidation tank, the lower end of the rear baffle plate is spaced from the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, and the front baffle plate and the rear baffle plate are spaced to form a bent flow channel; the N pairs of deflectors divide the hydrogen peroxide/ozone combined oxidation tank into N +1 reaction units.
According to the preferred embodiment of the invention, the partition plates are arranged below the aerobic tank and the anaerobic tank of the biochemical tank, the partition plate in the aerobic tank and the bottom of the aerobic tank form a first water distribution area, and the aerobic nitrification biological filler is piled above the partition plates; a second water distribution area is formed by the partition board in the anaerobic tank and the anaerobic tank, and anaerobic denitrification biological filler is filled above the partition board; the long-handle water distribution head is arranged on the clapboard, and the water outlet end of the long-handle water distribution head extends into the aerobic nitrification biological filler or the anaerobic denitrification biological filler.
According to the preferred embodiment of the invention, the aerobic tank is communicated with the anaerobic tank through an overflow channel, and water in the aerobic tank overflows out after rising to a certain height and enters the anaerobic tank from the bottom of the anaerobic tank; an overflow water outlet groove is arranged above the anaerobic tank.
According to the preferred embodiment of the invention, the wastewater treatment device further comprises a hydrogen peroxide storage tank and a wastewater storage tank, wherein a hydrogen peroxide reagent in the hydrogen peroxide storage tank is led out by adopting a hydrogen peroxide pipe, and wastewater in the storage tank in the wastewater storage tank is led out by adopting a wastewater pipe; the hydrogen peroxide pipe and the waste water pipe are connected to a waste water-hydrogen peroxide mixing pressure pump together for full mixing and pressurization, and then are sent to a hydrogen peroxide/ozone combined oxidation pond through a water distribution pipe.
According to the preferred embodiment of the invention, the hydrogen peroxide/ozone combined oxidation pond is filled with an ozone catalyst, such as a copper-doped manganese-based catalyst loaded by activated alumina; the ozone catalyst is solid particles, a grid is arranged below the reaction unit and is higher than the water distribution pipe and the ozone distribution pipe, and the ozone catalyst is stacked above the grid. The copper-doped manganese-based catalyst loaded by the active alumina can efficiently oxidize and degrade organic matters which are difficult to degrade in water in the presence of ozone with extremely low concentration.
According to the preferred embodiment of the invention, the hydrogen peroxide/ozone combined oxidation pond and the biochemical pond are built by cement concrete.
Preferably, the hydraulic retention time ratio range of the hydrogen peroxide/ozone combined oxidation pond and the biochemical pond is controlled to be 1-2:1; controlling the hydraulic retention time in the hydrogen peroxide/ozone combined oxidation tank to be 2-4 hours; controlling the hydraulic retention time of the biochemical pool to be 1.5-2.5 hours. According to the sample introduction speed of the wastewater, the adding concentration of ozone is controlled to be 10-20mg/L, and the adding concentration of hydrogen peroxide is controlled to be 5-10mg/L.
(III) advantageous effects
(1) The invention combines ozone oxidation, hydrogen peroxide oxidation, a biochemical pool and the like, and provides proper biochemical conditions for subsequent biochemical degradation after the wastewater is oxidized by the ozone and the hydrogen peroxide. When the wastewater is pressurized and mixed in the wastewater-hydrogen peroxide mixing pressure pump, the hydrogen peroxide performs the first oxidation on organic matters in the wastewater, and then performs the second oxidation after mixing with the ozone. Because the hydrogen peroxide and the ozone have different oxidation selectivity, the two oxidants can be complemented to play a role in synergistic oxidation, and the stability of the oxidative degradation of organic matters is improved. And the products of the two oxidants are nontoxic and harmless products, so that secondary pollution, such as metal ion pollution and the like, can not be caused to the wastewater.
(2) According to the invention, the water distribution spray head of the reaction unit at the head end is opposite to the ozone distribution plate, the ozone distribution plate faces upwards, and the water distribution spray head faces downwards, so that strong convection is formed between ozone and wastewater, ozone is fully dissolved in the wastewater to form micro-nano ozone bubbles, and organic matters in water are rapidly degraded.
(3) In the invention, except that the reaction unit at the head end is directly supplied with high-purity ozone by the ozone generator, the ozone supply of the other reaction units is from the ozone recovery pipe at the top end of the hydrogen peroxide/ozone combined oxidation pond, and the concentration of the ozone is lower at the moment, so that the ozone dissolving residue in the wastewater from the hydrogen peroxide/ozone combined oxidation pond can be reduced. Ozone almost has a strong killing effect on all bacteria, so that if the dissolved ozone residue in the wastewater treated by the hydrogen peroxide/ozone combined oxidation tank is high, effective biochemical degradation treatment cannot be carried out. The reaction unit at the tail end is also provided with an ozone removal device, so that the dissolved residual quantity of ozone in the wastewater can be further reduced, and the requirement of further biochemical treatment can be met.
(4) The biochemical pool comprises an aerobic pool (nitrification) and an anaerobic pool (denitrification), wherein the aerobic pool is connected with the effluent of the hydrogen peroxide/ozone combined oxidation pool, and the anaerobic pool is connected with the aerobic pool. Because the hydrogen peroxide and the ozone react to generate oxygen, the wastewater contains certain oxygen concentration, and the oxygen concentration is not beneficial to directly carrying out the anaerobic denitrification process, so the invention firstly utilizes the oxygen dissolved in the water to carry out aerobic treatment (the oxygen aeration is not needed at the moment), firstly consumes the oxygen and converts the small molecules containing N into nitryl or nitroso, and the wastewater which consumes the oxygen is further treated into nitrogen by an anaerobic tank, thereby achieving the effect of reducing TN in the water. The long-handle water distribution heads are arranged at the bottoms of the aerobic tank and the anaerobic tank, water is fed into the middle of the filler, and water flow is prevented from directly flowing between the filler and the tank wall.
Drawings
FIG. 1 is a schematic view of a wastewater treatment apparatus according to example 1 of the present invention.
FIG. 2 is a schematic view of a wastewater treatment apparatus according to example 2 of the present invention.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings.
Example 1
As shown in fig. 1, which is a schematic view of the composition structure of the wastewater treatment apparatus according to embodiment 1 of the present invention, a hydrogen peroxide/ozone combined oxidation pond 16 has a long structure, and the inside of the hydrogen peroxide/ozone combined oxidation pond is divided into N +1 reaction units which are communicated with each other by N pairs of flow plates, wherein N is an integer greater than or equal to 2. As shown in the figure, each pair of baffle plates consists of a front baffle plate and a rear baffle plate, the lower end of the front baffle plate is fixed on the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the front baffle plate is spaced from the top plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the rear baffle plate is fixed on the top plate of the hydrogen peroxide/ozone combined oxidation tank, the lower end of the rear baffle plate is spaced from the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, and the front baffle plate and the rear baffle plate are spaced to form a bent flow channel; the hydrogen peroxide/ozone combined oxidation pond is divided into N +1 reaction units by the pair of convection plates.
In this example, N is 2 and the number of reaction units is 3. An ozone distribution pipe 37 and a plurality of ozone gas distribution disks 40 arranged on the ozone distribution pipe 37 are arranged below each reaction unit, a plurality of micropores are formed in each ozone gas distribution disk 40, and the openings of the micropores face upwards. A water distribution pipe 39 and a plurality of water distribution nozzles 38 arranged on the water distribution pipe 39 are also arranged below the reaction unit at the head end position (the first reaction unit close to the water inlet side), and the openings of the water distribution nozzles 38 face downwards and are just opposite to the ozone distribution plate 40.
An ozone distribution pipe 37 located below the head-end located reaction unit is connected directly to the ozone generator 1 via a pipe 3 to supply high purity ozone to the head-end located reaction unit.
Wherein the water distribution pipe 39 is connected with the wastewater-hydrogen peroxide mixture pressure pump 11 through the hydrogen peroxide wastewater mixing pipe 14. The hydrogen peroxide reagent in the hydrogen peroxide storage tank 4 is connected to the wastewater-hydrogen peroxide mixed pressure pump 11 through the hydrogen peroxide pipe 8, the wastewater in the wastewater collection tank 9 is also connected to the wastewater-hydrogen peroxide mixed pressure pump 11 through the wastewater pipe 10, and therefore the wastewater and the hydrogen peroxide reagent are introduced into the wastewater-hydrogen peroxide mixed pressure pump 11 to be pressurized and mixed, and the oxidative degradation capacity of the hydrogen peroxide reagent on organic matters in the wastewater is improved. The wastewater mixed with the hydrogen peroxide enters the reaction unit at the head end, the water distribution nozzle 38 sprays the water downwards to form strong convection and mixing with the high-purity ozone sprayed by the ozone distribution disc 40, and the ozone is scattered into micro bubbles to be mixed into the wastewater, so that the organic matters in the wastewater are further oxidized and degraded.
Except the reaction units at the head end, the ozone distribution pipes 37 of the other reaction units are connected with an ozone recovery pipe 21, the ozone recovery pipe 21 is connected with an ozone collection pipe 19 at the top end of the hydrogen peroxide/ozone combined oxidation pond through a recovery pump 17, and except the reaction units at the tail end, the top end of each reaction unit is provided with an ozone collection pipe 19 for collecting the unreacted ozone so as to return to the bottom of the reaction unit for reuse. But the concentration of the recovered ozone is lower, so that the influence on the biodegradability of the water from the hydrogen peroxide/ozone combined oxidation pond 16 due to overhigh ozone content is avoided. As shown in fig. 1, a manhole 18 is provided above each reaction cell, so that a person can observe the inside.
The water outlet side of the hydrogen peroxide/ozone combined oxidation tank is connected with a biochemical tank, as shown in fig. 1, the biochemical tank comprises an aerobic tank 271 and an anaerobic tank 272, and the anaerobic tank 272 is arranged at the water outlet side of the aerobic tank 271. Wherein, the aerobic tank 271 is internally provided with aerobic nitrification biological filler with the filling rate of 40-50% by volume, and the anaerobic tank 272 is filled with anaerobic denitrification biological filler with the filling rate of 50-60% by volume.
Because partial hydrogen peroxide remains after the hydrogen peroxide is firstly used for oxidation treatment in the hydrogen peroxide/ozone combined oxidation tank 16, the hydrogen peroxide and the ozone can react to generate oxygen, and the partial oxygen is easily dissolved in the wastewater. Therefore, if the anaerobic tank 272 is directly connected to the water outlet side of the hydrogen peroxide/ozone combined oxidation tank 16, the dissolved oxygen in the wastewater is likely to be too high, which is very unfavorable for the life activities of the anaerobic denitrifying bacteria. If the aerobic tank 271 is connected to the water outlet side of the hydrogen peroxide/ozone combined oxidation tank 16, aeration of the aerobic tank 271 can be avoided because the water has a certain amount of dissolved oxygen. Aerobic nitrification treatment is firstly carried out to convert the degraded organic nitrogenous micromolecules into nitrate nitrogen or nitrite nitrogen, and the nitrate nitrogen is further metabolized by denitrifying bacteria in the anaerobic tank 272 to become harmless nitrogen to be discharged, so that the total nitrogen content in water can be reduced.
Partition plates 33 are arranged below the aerobic tank 271 and the anaerobic tank 272 respectively, a first water distribution area is formed by the partition plates 33 in the aerobic tank 271 and the bottom of the aerobic tank, and aerobic nitrification biological filler is piled above the partition plates; the partition 33 in the anaerobic tank 272 and the anaerobic tank form a second water distribution area, and anaerobic denitrification biological filler is stacked above the partition. The partition plates 33 are all provided with long-handle water distribution heads 32, and the water outlet ends of the long-handle water distribution heads 32 extend to the middle of the pile body of the aerobic nitrification biological filler or the anaerobic denitrification biological filler, so that the wastewater to be treated can be prevented from directly flowing away from the space between the pile body of the filler and the side wall of the reaction tank. Wherein, the aerobic tank 271 and the anaerobic tank 272 are also communicated by an overflow channel, the water in the aerobic tank 271 can overflow out only after rising to a certain height and enters the anaerobic tank 272 from the bottom of the anaerobic tank 272, and an overflow water outlet groove 28 is arranged above the anaerobic tank 272.
The wastewater is oxidized and degraded by adopting the synergy of hydrogen peroxide and ozone, and the two oxidants can play a synergistic oxidation role in a complementary manner, so that the stability of the organic matters subjected to oxidative degradation is improved. In addition, in order to improve the utilization efficiency of ozone, an ozone catalyst, such as a commercialized activated alumina-supported copper-doped manganese-based catalyst, can be filled in the hydrogen peroxide/ozone combined oxidation tank 16, the ozone catalyst is in a solid granular form, a grid is arranged below the reaction unit, the grid is higher than the water distribution pipe 39 and the ozone distribution pipe 37, and the ozone catalyst is stacked above the grid. By using the copper-doped manganese-based catalyst loaded by active alumina, organic matters which are difficult to degrade in water can be efficiently oxidized and degraded in the presence of ozone with extremely low concentration. These ozone catalysts can reduce the residual dissolved ozone levels in the water exiting the combined hydrogen peroxide/ozone oxidation tank 16. Preferably, the ozone distribution pipe 37 below the reaction unit at the end of the hydrogen peroxide/ozone combined oxidation pond 16 is controlled to be in a non-conducting state by using a separate valve, which is also beneficial to reducing the dissolved amount of ozone in the water discharged from the hydrogen peroxide/ozone combined oxidation pond 16.
Because ozone almost has a killing effect on most bacteria and has a strong inhibiting effect on the activity of denitrifying bacteria, in order to further reduce the residual amount of ozone in the water discharged from the hydrogen peroxide/ozone combined oxidation tank 16, an ozone removing device 26 can be arranged at the reaction unit at the tail end of the hydrogen peroxide/ozone combined oxidation tank 16, and the ozone removing device 26 mainly sucks out the unreacted and undissolved ozone through the suction negative pressure effect and adopts an ultraviolet irradiation machine for destructive decomposition.
In the operation process of the wastewater treatment device, the hydraulic retention time ratio range of the hydrogen peroxide/ozone combined oxidation pond 16 to the biochemical pond (271, 272) is controlled to be 1-2:1; controlling the hydraulic retention time in the hydrogen peroxide/ozone combined oxidation pond 16 to be 2-4 hours; controlling the hydraulic retention time of the biochemical pool to be 1.5-2.5 hours. According to the sample introduction speed of the wastewater, the adding concentration of ozone is controlled to be 10-20mg/L, and the adding concentration of hydrogen peroxide is controlled to be 5-10mg/L.
The whole waste water treatment device can be built by reinforced concrete.
Example 2
The difference between this embodiment and embodiment 1 can be seen in fig. 2. In this embodiment, the ozone removing apparatus is composed of an immersion type ultraviolet irradiation lamp 261, a stirrer 262 and an air exhauster. The energy of the ultraviolet rays is provided for the ozone to break chemical bonds and oxygen to synthesize chemical bonds by utilizing the energy provided by the ultraviolet irradiation lamp. The speed reaction of decomposing ozone by ultraviolet irradiation is very fast, the time is extremely short, and the efficiency is high. The wastewater around the ultraviolet irradiation lamp 261 is made to flow continuously in cooperation with the agitator 262 to remove ozone dissolved in the wastewater as much as possible, and the gas gathered above the reaction unit is exhausted by the gas exhauster. Preferably, the air extractor is connected to the waste incinerator. By using the ozone removing device of the embodiment 2, ozone gas escaping from the wastewater to the upper part of the reaction unit can be removed, ozone dissolved in the wastewater can be removed, the dissolved residual quantity of ozone in the wastewater is further reduced, and the subsequent biochemical degradation treatment is facilitated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A wastewater treatment device for an ozone/hydrogen peroxide synergistic oxidation coupling biochemical pool is characterized by comprising: the hydrogen peroxide/ozone combined oxidation pond is internally divided into N +1 mutually communicated reaction units by N pairs of flow plates, wherein N is an integer more than or equal to 2; an ozone distribution pipe and a plurality of ozone distribution disks arranged on the ozone distribution pipe are arranged below each reaction unit, and the openings of the ozone distribution disks are upward; a water distribution pipe and a plurality of water distribution nozzles arranged on the water distribution pipe are also arranged below the reaction unit positioned at the head end, the openings of the water distribution nozzles face downwards and are just opposite to the ozone gas distribution plate; the water distribution pipe is connected with a wastewater-hydrogen peroxide mixed pressure pump;
the ozone distribution pipe of the reaction unit positioned at the head end is connected with an ozone generator; the ozone distribution pipes of the other reaction units are connected with an ozone recovery pipe, and the ozone recovery pipe is connected to the top end of the hydrogen peroxide/ozone combined oxidation pond and used for collecting the unreacted ozone; the biochemical tank is connected to the water outlet side of the hydrogen peroxide/ozone combined oxidation tank, and the reaction unit at the tail end is also provided with an ozone removing device.
2. The wastewater treatment device according to claim 1, wherein the biochemical tank comprises an aerobic tank and an anaerobic tank, the aerobic tank is connected with the hydrogen peroxide/ozone combined oxidation tank, and the anaerobic tank is arranged on the water outlet side of the aerobic tank.
3. The wastewater treatment device of claim 2, wherein the aerobic tank is filled with aerobic nitrification biological filler with a filling rate of 40-50%, and the anaerobic tank is filled with anaerobic denitrification biological filler with a filling rate of 50-60%.
4. The wastewater treatment apparatus according to claim 1, wherein the ozone removing device is composed of an ultraviolet irradiation lamp, a stirrer and an air extractor; and decomposing ozone dissolved in the wastewater by using an ultraviolet irradiation lamp, and discharging the gas gathered above the reaction unit by using an air extractor.
5. The wastewater treatment device according to claim 1, wherein each pair of baffle plates consists of a front baffle plate and a rear baffle plate, the lower end of the front baffle plate is fixed on the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the front baffle plate is spaced from the top plate of the hydrogen peroxide/ozone combined oxidation tank, the upper end of the rear baffle plate is fixed on the top plate of the hydrogen peroxide/ozone combined oxidation tank, the lower end of the rear baffle plate is spaced from the bottom plate of the hydrogen peroxide/ozone combined oxidation tank, and the front baffle plate and the rear baffle plate are spaced to form a bent flow channel; the hydrogen peroxide/ozone combined oxidation pond is divided into N +1 reaction units by the pair of convection plates.
6. The wastewater treatment device according to claim 1, wherein a partition is arranged below each of the aerobic tank and the anaerobic tank of the biochemical tank, the partition in the aerobic tank and the bottom of the aerobic tank form a first water distribution area, and aerobic nitrification biological filler is stacked above the partition; a partition plate in the anaerobic tank and the anaerobic tank form a second water distribution area, and anaerobic denitrification biological fillers are piled above the partition plate; the long-handle water distribution head is arranged on the clapboard, and the water outlet end of the long-handle water distribution head extends into the aerobic nitrification biological filler or the anaerobic denitrification biological filler.
7. The wastewater treatment device of claim 1, wherein the aerobic tank and the anaerobic tank are communicated through an overflow channel, and water in the aerobic tank overflows after rising to a certain height and enters the anaerobic tank from the bottom of the anaerobic tank; an overflow water outlet groove is arranged above the anaerobic tank.
8. The wastewater treatment device of claim 1, further comprising a hydrogen peroxide storage tank and a wastewater storage tank, wherein a hydrogen peroxide reagent in the hydrogen peroxide storage tank is led out by a hydrogen peroxide pipe, and wastewater in the storage tank in the wastewater storage tank is led out by a wastewater pipe; the hydrogen peroxide pipe and the waste water pipe are connected to a waste water-hydrogen peroxide mixing pressure pump together for full mixing and pressure, and then are sent into a hydrogen peroxide/ozone combined oxidation pond through a water distribution pipe.
9. The wastewater treatment device according to claim 1, wherein an ozone catalyst is filled in the hydrogen peroxide/ozone combined oxidation tank; the ozone catalyst is a copper-doped manganese-based catalyst loaded by active alumina.
10. The wastewater treatment device according to claim 1, wherein the hydrogen peroxide/ozone combined oxidation pond and the biochemical pond are constructed by cement concrete.
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