CN112591999A - Method and system for synchronously removing organic matters and ammonia nitrogen in wastewater - Google Patents
Method and system for synchronously removing organic matters and ammonia nitrogen in wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 70
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 29
- 238000005273 aeration Methods 0.000 claims abstract description 25
- -1 nitrate ions Chemical class 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 22
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 150000002831 nitrogen free-radicals Chemical class 0.000 claims abstract description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 11
- 244000005700 microbiome Species 0.000 claims abstract description 10
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 230000005855 radiation Effects 0.000 claims description 8
- 241000894006 Bacteria Species 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 230000000813 microbial effect Effects 0.000 claims description 6
- 239000004480 active ingredient Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 241000108664 Nitrobacteria Species 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 125000001477 organic nitrogen group Chemical group 0.000 description 9
- 239000002957 persistent organic pollutant Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 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
- 229910021529 ammonia Inorganic materials 0.000 description 2
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- 238000006356 dehydrogenation reaction Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
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- 239000013543 active substance Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- C02F1/001—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
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F3/302—Nitrification and denitrification treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to a method and a system for removing ammonia nitrogen and organic matters in wastewater. The method comprises the following specific steps: the wastewater enters an aeration biological filter, and wastewater containing nitrate and macromolecular organic matters is obtained under the filtering action of a filter material and the treatment of microorganisms; the wastewater containing nitrate and macromolecular organic matters enters an ultraviolet irradiation tank, nitrate ions generate hydroxyl radicals and nitrogen radicals under the irradiation of ultraviolet rays, and the macromolecular organic matters are decomposed under the action of the hydroxyl radicals and the nitrogen radicals to obtain micromolecular substances, carbon dioxide and water. The treatment effect of the macromolecular organic matters is improved, and the method is suitable for treating wastewater with high content of the macromolecular organic matters.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and a system for synchronously removing ammonia nitrogen and organic matters in wastewater.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
A large amount of high ammonia nitrogen wastewater can be generated in the production process of industries such as petrifaction, pharmacy, coking, synthetic ammonia, leather making and the like, wherein the ammonia nitrogen concentration of some wastewater can exceed 1000mg/L (counted by N, the same is shown below), the ammonia nitrogen concentration of partial garbage leakage liquid can exceed 3000mg/L, the ammonia nitrogen concentration of wastewater generated by partial production units in some industries can reach 5000mg/L, and the ammonia nitrogen concentration of some wastewater can even exceed 10000 mg/L. If the high ammonia nitrogen wastewater is directly discharged into a receiving water body without being treated, serious harm is caused to the environment, and the method mainly comprises the following aspects: firstly, the consumption of dissolved oxygen in water, secondly, the toxic action of free ammonia on aquatic animals and plants, and thirdly, the eutrophication of water body. In addition, most of the high ammonia nitrogen wastewater produced in industrial production usually has high organic matter concentration (calculated as COD), generally more than 2000mg/L, and some high organic matter concentration is even as high as tens of thousands to hundreds of thousands of milligrams per liter. Such waste water is generally poor in biodegradability and high in toxicity, and has an obvious 'three-cause' effect.
The aeration biological filter tank is a biological membrane sewage treatment technology integrating the functions of microbial degradation and filter material filtration. The microorganism attached to the filler is used for oxidizing and decomposing pollutants in the wastewater, and meanwhile, the filler and the microorganism attached to the filler can intercept or adsorb particulate matters in the wastewater. The biological membrane of the aeration biological filter forms different gradient dissolved oxygen concentrations from outside to inside, thereby forming an aerobic, anoxic and anaerobic microorganism layered structure and having better organic pollutant removal capability. In addition, a large amount of ammonifying bacteria, nitrifying bacteria and denitrifying bacteria in the biological filter can efficiently remove ammonia nitrogen and organic nitrogen in sewage. Although the biological filter can degrade most organic pollutants, for macromolecular organic matters which are difficult to biodegrade, the biological filter is only used to achieve a better treatment effect.
A large number of researches show that the removal of organic nitrogen and ammonia nitrogen by the biological aerated filter is mainly to convert the organic nitrogen and the ammonia nitrogen into nitrate nitrogen, and the conversion rate is as high as 75-85%. Nitrate is used as an important source of hydroxyl radicals in nature, and researches show that ultraviolet light with the wavelength of 254nm is used for irradiating nitrate-containing solution to generate a plurality of active components such as hydroxyl radicals, nitrogen radicals and the like, and organic pollutants in organic wastewater can be effectively degraded in a hydrogen abstraction, addition and electron transfer mode.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method and a system for removing ammonia nitrogen and organic matters in wastewater.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a method for removing ammonia nitrogen and organic matters in wastewater comprises the following specific steps:
the wastewater enters an aeration biological filter, and wastewater containing nitrate and macromolecular organic matters is obtained under the filtering action of a filter material and the treatment of microorganisms;
the wastewater containing nitrate and macromolecular organic matters enters an ultraviolet irradiation tank, nitrate ions generate hydroxyl radicals and nitrogen radicals under the irradiation of ultraviolet rays, and the macromolecular organic matters are decomposed under the action of the hydroxyl radicals and the nitrogen radicals to obtain micromolecular substances, carbon dioxide and water.
In the biological aerated filter, a filter material filters, adsorbs and biologically treats sewage, adsorbs and intercepts macromolecular suspended particles and partial hydrophobic organic matters, the biological treatment realizes the conversion of ammonia nitrogen and organic nitrogen and the oxidation of the organic matters, the accumulation of nitrate radicals in the wastewater is realized through the biological aerated filter, the irradiation of ultraviolet light excites the nitrate radicals to generate hydroxyl radicals and nitrogen radicals, the organic matters are oxidized and decomposed into micromolecular organic matters or inorganic matters, and the mineralization of the organic matters is realized while the biodegradability of a water body is improved.
Is suitable for treating wastewater with high content of macromolecular organic matters.
In a second aspect, the system for removing ammonia nitrogen and organic matters in wastewater comprises a biological aerated filter and an ultraviolet irradiation tank, wherein the biological aerated filter is provided with a filter water inlet, a filter water outlet and an aeration port, the aeration port is positioned at the bottom of the biological aerated filter, the filter water outlet is connected with the ultraviolet irradiation tank, and an ultraviolet light source is arranged in the ultraviolet irradiation tank.
One or more technical schemes of the invention have the following beneficial effects:
the biological aerated filter is used for adsorbing and biologically treating wastewater, intercepting and adsorbing macromolecular suspended particles and part of hydrophobic organic matters, converting ammonia nitrogen and organic nitrogen in the wastewater by microorganisms and biologically oxidizing the ammonia nitrogen and the organic nitrogen to obtain a large amount of nitrate, and then enabling the wastewater containing the nitrate and the macromolecular organic matters to enter an ultraviolet irradiation tank to decompose the macromolecular organic matters.
Compared with the existing biological aerated filter, the biological aerated filter has the advantages that the conversion rate of nitrate is improved to 75-85%;
the removal rate of macromolecular organic matters in the wastewater is improved to 40-82%.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a system structure diagram for removing ammonia nitrogen and organic matters in wastewater;
the system comprises a biological aerated filter (1), an ultraviolet irradiation tank (2), a filter water inlet (3), a filter water outlet (4), an aeration port (5), a backwashing water inlet (6), an ultraviolet radiation lamp (7), an ultraviolet irradiation tank water outlet (8) and an activated carbon filter material (9).
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In a first aspect, a method for removing ammonia nitrogen and organic matters in wastewater comprises the following specific steps:
the wastewater enters an aeration biological filter, and wastewater containing nitrate and macromolecular organic matters is obtained under the filtering action of a filter material and the treatment of microorganisms;
the wastewater containing nitrate and macromolecular organic matters enters an ultraviolet irradiation tank, nitrate ions generate a plurality of active ingredients such as hydroxyl radicals, nitrogen radicals and the like under the irradiation of ultraviolet rays, and the macromolecular organic matters are decomposed under the action of the hydroxyl radicals and the nitrogen radicals to obtain micromolecular substances, carbon dioxide and water.
In the biological aerated filter, a filter material filters, adsorbs and biologically treats sewage, adsorbs and intercepts macromolecular suspended particles and part of hydrophobic organic matters, the biological treatment realizes the conversion of ammonia nitrogen and organic nitrogen and the oxidation of organic matters, the biological aerated filter realizes the accumulation of nitrate radicals in the wastewater, and the irradiation of ultraviolet light excites the nitrate radicals to generate hydroxyl radicals and nitrogen radicals, thereby realizing the oxidative decomposition of the organic matters.
In some embodiments of the invention, the filter material is activated carbon, and the depth of the activated carbon filter layer in the aeration biological tank is 150-160 cm. Within this range, the highest concentration nitrate nitrogen accumulation can be achieved, with good denitrification effect while accumulating nitrate for subsequent uv photolysis.
The active carbon has a developed pore structure and a huge specific surface area, and has a certain interception capability; meanwhile, a part of the surface of the pore is burnt in the activation process to cause defects, and in addition, a large amount of ash and heteroatoms exist on the surface of the pore, so that the prepared activated carbon generates artificial defects and unsaturated valence, adsorbs oxygen and other heteroatoms to form various surface functional groups, and has a good adsorption effect.
In some embodiments of the invention, the microbial media of the biological aerated filter are nitrifying bacteria and denitrifying bacteria. The microbial medium converts ammonia nitrogen and organic nitrogen, and biologically oxidizes organic pollutants.
In some embodiments of the invention, the hydraulic retention time of the wastewater in the biological aerated filter is 4-5 hours. The hydraulic retention time in the range is kept, the activity of nitrobacteria is strong, the optimal denitrification effect and nitrification effect can be obtained, and the removal of ammonia nitrogen and the accumulation of nitrate are facilitated.
In some embodiments of the invention, the power of the ultraviolet radiation is 8-12w and the wavelength of the ultraviolet radiation is 254 nm. The effluent containing nitrate is irradiated to generate active substances such as hydroxyl radicals, nitrogen radicals and the like, and chemical bonds of macromolecular degradation-resistant organic pollutants are broken through hydrogen abstraction, addition and electron transfer to enable the macromolecular degradation-resistant organic pollutants to become micromolecular organic matters or carbon dioxide and water, so that the harm of ammonia nitrogen and total organic carbon in the effluent to the environment is reduced.
In a second aspect, the system for removing ammonia nitrogen and organic matters in wastewater comprises a biological aerated filter and an ultraviolet irradiation tank, wherein the biological aerated filter is provided with a filter water inlet, a filter water outlet and an aeration port, the aeration port is positioned at the bottom of the biological aerated filter, the filter water outlet is connected with the ultraviolet irradiation tank, and an ultraviolet light source is arranged in the ultraviolet irradiation tank.
In some embodiments of the invention, the middle part of the biological aerated filter is provided with an activated carbon filter material, and the depth of the activated carbon filter material layer is 150-160 cm.
In some embodiments of the invention, an aeration layer is arranged at the lower part of the biological aerated filter, and the aeration layer is connected with the upper filter through a filter material bearing layer.
In some embodiments of the invention, the water inlet of the biological aerated filter is positioned at the bottom, the water outlet is positioned at the top, and the top of the biological aerated filter is provided with a back-flushing water inlet.
In some embodiments of the invention, several uv lamps are arranged on top of the uv irradiation cell.
In some embodiments of the present invention, the upper part of the ultraviolet irradiation tank is provided with a water inlet, and the lower part of the ultraviolet irradiation tank is provided with a water outlet.
As shown in figure 1, the system for removing ammonia nitrogen and organic matters in wastewater comprises a biological aerated filter 1 and an ultraviolet irradiation tank 2, wherein the biological aerated filter 1 is provided with a filter water inlet 3, a filter water outlet 4 and an aeration port 5, the aeration port 5 is positioned at the bottom of the biological aerated filter 1, the filter water outlet 4 is connected with the ultraviolet irradiation tank 2, and an ultraviolet light source is arranged in the ultraviolet irradiation tank 2.
The biological aerated filter 1 contains a microbial medium, the microbial medium treats sewage to realize the oxidation of organic matters and the conversion of ammonia nitrogen and organic nitrogen, and a filter material in the biological aerated filter 1 adsorbs the wastewater, so that macromolecular suspended particles and part of hydrophobic organic matters in the wastewater are retained in the biological aerated filter.
The middle part of the biological aerated filter 1 is provided with an active carbon filter material 9, and the depth of an active carbon filter layer is 150-160 cm. The activated carbon is used for adsorbing the wastewater by utilizing the characteristic of porosity.
The aeration layer is arranged at the lower part of the biological aerated filter 1.
The biological aerated filter 1 adopts natural enrichment culture biofilm formation, and in an aeration layer, the organic wastewater to be treated is aerated and adsorbed on fillers by utilizing various microorganisms in the wastewater to form a biological membrane by culture.
A filter water inlet 3 of the biological aerated filter 1 is positioned at the bottom, a filter water outlet 4 is positioned at the top, and a back flush water inlet 6 is arranged at the top of the biological aerated filter. Wastewater passes through the filter tank from bottom to top, and aeration passes through the filter material from bottom to top. Therefore, pollutants in the wastewater are gradually adsorbed and treated, and then are discharged from the top water outlet of the biological aerated filter 1 into the ultraviolet radiation tank 2.
The top of the ultraviolet radiation pool 2 is provided with a plurality of ultraviolet radiation lamps 7. Ultraviolet light enters the wastewater of the ultraviolet irradiation tank, nitrate radicals in the wastewater obtain various active ingredients such as hydroxyl free radicals and nitrogen free radicals under the action of the ultraviolet light, and the active ingredients continue to act on the degraded wastewater, so that the degradation of macromolecular organic matters in the wastewater is realized, and the content of the macromolecular organic matters in the wastewater is reduced.
The upper part of the ultraviolet irradiation tank is provided with a water inlet, and the lower part is provided with an ultraviolet irradiation tank water outlet 8.
And the back-flushing water inlet 6 is used for back flushing of the biological aerated filter 1, and can carry out back flushing after the filter material is used for a long time, so that the biological stability of the filter material is ensured, and the reusability of the filter material is improved.
The invention will be further illustrated by the following examples
Example 1
The wastewater (the ammonia nitrogen concentration is 537.1mg/L, the COD concentration is 963.2mg/L) enters an aeration biological filter, and the wastewater containing nitrate and macromolecular organic matters is obtained under the filtering action of a filter material and the treatment of microorganisms; the nitrate concentration in the obtained wastewater was 386.6 mg/L.
The wastewater containing nitrate and macromolecular organic matters enters an ultraviolet irradiation tank, nitrate ions generate hydroxyl radicals and nitrogen radicals under the irradiation of ultraviolet rays (the wavelength of the ultraviolet rays is 254nm), and the macromolecular organic matters are decomposed under the action of the hydroxyl radicals and the nitrogen radicals to obtain micromolecular substances, carbon dioxide and water. Finally, the obtained wastewater (the ammonia nitrogen concentration is 53.8mg/L, and the COD concentration is 36.8 mg/L).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for removing ammonia nitrogen and organic matters in wastewater is characterized in that: the wastewater enters an aeration biological filter, and wastewater containing nitrate and macromolecular organic matters is obtained under the filtering action of a filter material and the treatment of microorganisms;
the wastewater containing nitrate and macromolecular organic matters enters an ultraviolet irradiation tank, nitrate ions generate a plurality of active ingredients such as hydroxyl radicals, nitrogen radicals and the like under the irradiation of ultraviolet rays, and the macromolecular organic matters are decomposed under the action of the hydroxyl radicals and the nitrogen radicals to obtain micromolecular substances, carbon dioxide and water.
2. The method for removing ammonia nitrogen and organic matters in wastewater according to claim 1, which is characterized in that: the filter material is activated carbon, and the depth of an activated carbon filter layer in the aeration biological tank is 150-160 cm.
3. The method for removing ammonia nitrogen and organic matters in wastewater according to claim 1, which is characterized in that: the microbial medium of the biological aerated filter is nitrobacteria and denitrifying bacteria.
4. The method for removing ammonia nitrogen and organic matters in wastewater according to claim 1, which is characterized in that: the hydraulic retention time of the wastewater in the biological aerated filter is 4-5 h.
5. The method for removing ammonia nitrogen and organic matters in wastewater according to claim 1, which is characterized in that: the power of ultraviolet radiation is 8-12w, and the wavelength of the ultraviolet is 254 nm.
6. The system for removing ammonia nitrogen and organic matters in wastewater is characterized in that: the device comprises a biological aerated filter and an ultraviolet irradiation tank, wherein the biological aerated filter is provided with a filter water inlet, a filter water outlet and an aeration port, the aeration port is positioned at the bottom of the biological aerated filter, the filter water outlet is connected with the ultraviolet irradiation tank, and an ultraviolet light source is arranged in the ultraviolet irradiation tank.
7. The system for removing ammonia nitrogen and organic matters in wastewater according to claim 6, characterized in that: and an active carbon filter material is arranged in the middle of the biological aerated filter, and the depth of the active carbon filter layer is 150-160 cm.
8. The system for removing ammonia nitrogen and organic matters in wastewater according to claim 6, characterized in that: the lower part of the biological aerated filter is provided with an aeration layer, and the aeration layer is connected with the upper filter through a filter material bearing layer.
9. The system for removing ammonia nitrogen and organic matters in wastewater according to claim 6, characterized in that: the water inlet of the biological aerated filter is positioned at the bottom, the water outlet of the biological aerated filter is positioned at the top, and the top of the biological aerated filter is provided with a back flush water inlet.
10. The system for removing ammonia nitrogen and organic matters in wastewater according to claim 6, characterized in that: the top of the ultraviolet irradiation pool is provided with a plurality of ultraviolet radiation lamps;
or the upper part of the ultraviolet irradiation tank is provided with a water inlet, and the lower part of the ultraviolet irradiation tank is provided with a water outlet.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115246694A (en) * | 2022-01-06 | 2022-10-28 | 山东建筑大学 | Treatment system for organic matters difficult to degrade in sewage |
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