CN111018268A - Resin coupling denitrification method - Google Patents
Resin coupling denitrification method Download PDFInfo
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- CN111018268A CN111018268A CN201911419088.XA CN201911419088A CN111018268A CN 111018268 A CN111018268 A CN 111018268A CN 201911419088 A CN201911419088 A CN 201911419088A CN 111018268 A CN111018268 A CN 111018268A
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- 239000011347 resin Substances 0.000 title claims abstract description 89
- 229920005989 resin Polymers 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 73
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 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 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 239000002351 wastewater Substances 0.000 claims abstract description 39
- 238000001179 sorption measurement Methods 0.000 claims abstract description 38
- 230000008929 regeneration Effects 0.000 claims abstract description 29
- 238000011069 regeneration method Methods 0.000 claims abstract description 29
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims abstract description 22
- 235000017281 sodium acetate Nutrition 0.000 claims abstract description 22
- 239000001632 sodium acetate Substances 0.000 claims abstract description 22
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003456 ion exchange resin Substances 0.000 claims description 24
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 24
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 23
- 230000006872 improvement Effects 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000012492 regenerant Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 239000010865 sewage Substances 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 230000000813 microbial effect Effects 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 241000894006 Bacteria Species 0.000 description 7
- 239000003957 anion exchange resin Substances 0.000 description 7
- 238000005342 ion exchange Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004099 anaerobic respiration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 208000005135 methemoglobinemia Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- PPCZRZDBVIEHMD-UHFFFAOYSA-N sodium;acetic acid;nitrate Chemical compound [Na+].CC(O)=O.[O-][N+]([O-])=O PPCZRZDBVIEHMD-UHFFFAOYSA-N 0.000 description 1
- 239000002352 surface water Substances 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a resin coupling denitrification denitrogenation method, which belongs to the technical field of sewage treatment; the method uses the regeneration liquid containing sodium acetate to regenerate the resin, uses the regenerated resin to carry out adsorption treatment on the nitrogen-containing wastewater, and then introduces the nitrogen-containing wastewater after the adsorption treatment into a denitrification reactor to carry out denitrification; the regeneration liquid can remove nitrate nitrogen through denitrification, and can be used as a microbial carbon source to improve the stability and treatment effect of a sewage biochemical system.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a resin coupling denitrification method.
Background
In recent years, with the rapid development of industry and agriculture in China, industrial wastewater and rural and urban domestic sewage continuously discharge nitrate nitrogen to the nature, so that the nitrate nitrogen content of surface water and underground water exceeds the standard, a series of environmental problems are caused, in addition, the high-concentration nitrate nitrogen is drunk for a long time to cause methemoglobinemia, and the nitrate nitrogen can be converted into carcinogenic nitrite nitrogen in a human body, so that the human body health is seriously harmed. The treatment of urban domestic sewage and industrial wastewater is greatly emphasized by the nation and the society, at present, the GB18918-2002 grade A discharge standard requires that the total nitrogen concentration does not exceed 15mg/L, the total nitrogen is difficult to reach the standard and is discharged under the conditions of low temperature in winter and low C/N of inlet water, and nitrogen in biochemical tail water has a high nitrification trend, and nitrate nitrogen in the tail water reaches more than 70 percent of the total nitrogen. Therefore, the development of an efficient nitrate nitrogen removal method has important significance on ecological environment protection and drinking water safety.
The removal of nitrate nitrogen in wastewater is always a difficult point of nitrogen pollution treatment, and the technologies mainly applied at home and abroad at present are a biological denitrification method, a chemical reduction method (reduction of zero-valent iron and magnesium), an ion exchange method, a reverse osmosis method, an adsorption method, a membrane technology, a distillation method and the like. In various treatment methods, the chemical reduction of nitrate nitrogen generates dangerous gases such as oxynitride gas, the use is not so much, the removal effect is greatly influenced by pH and temperature, and intermediate byproducts need to be treated. The methods of ion exchange, reverse osmosis and adsorption are all the transfer and concentration of nitrate nitrogen, and the nitrate nitrogen in the method cannot be really removed. The common denitrification method is a microbial denitrification method, the denitrifying bacteria are heterotrophic facultative anaerobes, and under the anoxic condition, nitrate nitrogen is used as an electron acceptor, and organic matters are used as an electron donor to perform anaerobic respiration, so that the nitrate nitrogen is reduced into nitrogen or nitrous oxide, and the organic matters are degraded at the same time. The nitrate nitrogen removal method has advantages and disadvantages, and the denitrification biological denitrification method and the ion exchange method are common nitrate nitrogen removal methods, and the two methods are combined to show good application prospects in nitrate nitrogen wastewater treatment. The method for deeply removing high-concentration nitrate nitrogen in wastewater disclosed in Chinese patent application publication No. CN106892543A integrates a denitrification deep bed filter and a magnetic ion exchange resin adsorption process to realize deep removal of high-concentration nitrate nitrogen in wastewater, but does not consider treatment of 10-26.7 wt% of sodium chloride regeneration waste liquid, and is only equivalent to transfer and concentration of nitrate in wastewater. Chinese patent application No. 201710296761.X discloses a method for deep nitrogen and phosphorus removal of industrial wastewater and biochemical tail water, which is characterized in that selective resin is adopted to adsorb and remove total nitrogen in the wastewater, and a resin regeneration solution sodium chloride solution is conveyed to a front-end biochemical treatment system of a sewage treatment plant, so that the total nitrogen load and the carbon source consumption of the front end are increased; the method for removing nitrate nitrogen in water by integrating ion exchange and denitrification disclosed in Chinese patent application publication No. CN 105036495A is characterized by utilizing high-selectivity nitrate ion exchange resin to enrich nitrate nitrogen in water or wastewater, and the ion exchange resin enriched with nitrate nitrogen can be directly regenerated and reused by biological denitrification under a certain condition, so that the nitrate nitrogen in water or wastewater can be efficiently removed, but the method does not consider the problem that the exchange efficiency is reduced because the resin is blocked by microbial mycelium.
Therefore, the combination of the resin and the denitrification biotechnology needs to be considered, the respective advantages are fully exerted by improving the process parameters, the effluent reaches the standard, and a new technical approach is opened for realizing the effective treatment of the total nitrogen wastewater.
Disclosure of Invention
1. Problems to be solved
Aiming at the technical problem that nitrate nitrogen in wastewater is difficult to be removed fully in the prior art, a resin coupling denitrification method realizes effective treatment of regeneration liquid and effective removal of nitrate nitrogen in wastewater by taking sodium acetate as a resin regenerant.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a resin coupling denitrification denitrogenation method, which comprises the steps of regenerating resin by using a regenerant containing sodium acetate, adsorbing nitrogen-containing wastewater by using the regenerated resin, and introducing the adsorbed nitrogen-containing wastewater into a denitrification reactor for denitrification denitrogenation.
The method comprises the following specific steps:
A. the process of removing nitrate nitrogen by ion exchange resin: pumping the wastewater with the nitrate nitrogen content of 10-80 mg/L into an anion exchange resin adsorption tower, and deeply removing the nitrate nitrogen in tail water by controlling the flow rate, wherein the concentration of the nitrate nitrogen in effluent water of the resin adsorption tower reaches 0-20 mg/L;
B. the regeneration process of the ion exchange resin comprises the following steps: outputting saturated resin in the ion exchange resin adsorption tower to a resin regenerator, controlling the temperature of the regenerator to be 25-35 ℃, regenerating the resin by using 2-8% sodium acetate solution, conveying the regenerated resin back to the ion exchange resin adsorption tower, continuously applying the regenerated liquid to the next batch of adsorption resin until the nitrate nitrogen concentration in the regenerated liquid reaches a certain concentration, stopping applying the regenerated liquid, and allowing the regenerated liquid to flow into a waste liquid collecting tank;
C. the denitrification process of the regenerated liquid comprises the following steps: pumping biochemical tail water and regenerated liquid into a denitrification reactor filled with a denitrification and denitrification composite filler according to a certain proportional relation, controlling the pH value of the denitrification and denitrification reactor to be 7.0-8.0, and HRT (high pressure distillation) of the reactor for 20-120 min to finish removal of nitrate nitrogen in regenerated waste liquid, wherein the concentration of the nitrate nitrogen in effluent of the reactor is lower than 1mg/L, and pumping the effluent of the reactor into an anoxic zone of a biochemical pool to improve the biodegradability of wastewater;
D. deep denitrification in a denitrification filter tank: the effluent of the resin adsorption tower flows into the denitrification filter, and acetate is released under the ion exchange action of the regenerated resin, so that a proper amount of carbon source is provided for denitrifying bacteria in the denitrification filter, and the concentration of the final effluent nitrate nitrogen is stabilized at 0-1 mg/L.
As a further improvement of the method, the content of nitrate nitrogen in the wastewater to be treated in the step A is 10-80 mg/L, and the temperature of the wastewater is 10-15 ℃.
As a further improvement of the present invention, the anion exchange resin in step A is a strongly basic anion exchange resin, which may be a strongly basic anion exchange resin made in China, 201 × 7(717), 202 × 7 (manufactured by West Longdan chemical plant, Shandong Shantou), Pu-rolite A520E (manufactured by Blelaite (China) Co., Ltd., Nanjing, China), and the flow rate of the resin adsorption tower is controlled to be 1-6 BV/h.
As a further improvement of the invention, the concentration of nitrate nitrogen in the effluent of the resin adsorption tower in the step A reaches 3-25 mg/L.
As a further improvement of the invention, in the step B, the temperature of the resin regenerator is controlled to be 25-35 ℃, 2-8% of sodium acetate is used for regenerating the resin, and the volume of the sodium acetate solution required by single-batch resin regeneration is 1-3 times of the volume of the resin.
As a further improvement of the invention, in the step B, the regenerated solution is continuously applied to the next batch of adsorption resin until the concentration of nitrate nitrogen in the regenerated solution reaches 200-600 mg/L, and the application can be stopped, and the regenerated sodium acetate-nitrate solution flows into a collecting pool.
As a further improvement of the invention, in the step C, the biochemical tail water and the regeneration liquid are mixed according to the volume ratio (2-8): 1, mixing to meet the requirement that the total salt content in the mixed water is 1-2 percent;
as a further improvement of the invention, the denitrification and denitrification composite filler is a denitrification and denitrification bacteria composite filler disclosed in chinese patent application publication No. CN201910522308.5, and the denitrification reactor is a denitrification reactor or a denitrification device disclosed in chinese patent application publication nos. CN201921566296.8 and CN 201910524431.0;
as a further improvement of the method, the pH value of the denitrification reactor is controlled to be 7.0-8.0, the HRT of the reactor is controlled to be 30-120 min, the removal of the nitrate nitrogen in the regenerated waste liquid is completed, and the concentration of the nitrate nitrogen in the effluent of the reactor is lower than 1 mg/L;
as a further improvement of the invention, the effluent of the denitrification reactor enters an anoxic section of a front-end biochemical treatment process to improve the biodegradability of a denitrification area;
as a further improvement of the invention, in the step D, the denitrification filter tank is HRT for 15-30 min and is filled with denitrification denitrogenation composite filler;
as a further improvement of the invention, the regenerated resin can release acetate under the ion exchange effect, so that a proper amount of carbon source is provided for denitrification of denitrifying bacteria in the denitrification filter, and the concentration of nitrate nitrogen in final effluent is stabilized at 0-1 mg/L.
3. Advantageous effects
Compared with the prior deep denitrification technology, the resin coupling denitrification deep denitrification method has the advantages that:
(1) according to the resin coupling denitrification method, sodium acetate is used as resin regeneration liquid, the regeneration liquid can remove nitrate nitrogen through denitrification, and can also be used as a microbial carbon source, so that the stability and the treatment effect of a sewage biochemical system are improved.
(2) According to the method for denitrifying by resin coupling denitrification, sodium acetate is used as resin of resin regeneration liquid, a small amount of acetate is released through the resin ion exchange effect, a proper amount of carbon source is provided for further removing nitrate nitrogen in the effluent of the resin tower, accurate control of the carbon source is realized, and the concentration of effluent organic matters is prevented from exceeding the standard.
(3) Compared with the prior deep denitrification technology, the resin coupling denitrification method can realize deep removal of nitrate nitrogen with different nitrate nitrogen concentrations in the wastewater, and the denitrification effect is also guaranteed under the low-temperature condition.
Drawings
FIG. 1 is a schematic flow chart of a resin-coupled denitrification method of the present invention, wherein "sodium acetate" refers to a regeneration liquid containing sodium acetate.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. Meanwhile, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description only, and are not used to limit the implementable scope, and the relative relationship changes or adjustments may be considered to be within the implementable scope of the present invention without substantial technical changes; in addition, the embodiments of the present invention are not independent of each other, but may be combined.
Example 1
The wastewater of the embodiment is obtained from wastewater after an aerobic tank (MBR) process of a municipal domestic sewage treatment plant, the average concentration of nitrate nitrogen is 10mg/L, the average concentration of COD is 40mg/L, the water temperature is 10-15 ℃, and the wastewater treatment steps are as follows:
A. the process of removing nitrate nitrogen by ion exchange resin: firstly, the wastewater flows through domestic strong-base anion exchange resin 201 multiplied by 7(717) at the flow rate of 6BV/h, and the average concentration of nitrate nitrogen in the effluent of a resin adsorption tower is 2 mg/L;
B. the regeneration process of the ion exchange resin comprises the following steps: and (3) outputting the saturated resin in the ion exchange resin adsorption tower to a resin regenerator, controlling the temperature of the regenerator to be 25-35 ℃, and regenerating the resin by using 2% sodium acetate solution, wherein the volume of the sodium acetate solution required by single-batch resin regeneration is 2 times of the volume of the resin. The regenerated resin is conveyed back to the ion exchange resin adsorption tower, the regenerated liquid continues to apply the next batch of adsorption resin until the concentration of nitrate nitrogen in the regenerated liquid reaches 200mg/L, the application is stopped, and the regenerated liquid flows into a waste liquid collecting pool;
C. the denitrification process of the regenerated liquid comprises the following steps: biochemical tail water and regeneration liquid are pumped into a denitrification reactor filled with denitrifying and denitrifying bacteria composite filler disclosed in Chinese patent application publication No. CN201910522308.5 according to a ratio of 2:1, the total salt content in mixed water is 1.5%, the pH value of the denitrification reactor is controlled to be 7.0-8.0, the HRT (Rockwell hardness) of the reactor is 60min, the concentration of nitrate nitrogen in effluent of the reactor is lower than 1mg/L, the effluent of the reactor is pumped into an anoxic zone of a biochemical pool, the biodegradability of wastewater is improved, and the denitrification removal rate of the anoxic pool is improved by 20%.
D. Deep denitrification in a denitrification filter tank: and (3) enabling the effluent of the resin adsorption tower to flow into a denitrification filter tank, and HRT (high-temperature hydrothermal digestion) for 15min to ensure that the concentration of nitrate nitrogen in the final effluent is stabilized below 0.5mg/L and the concentration of COD (chemical oxygen demand) is 20-25 mg/L.
Comparative example 1
Regarding the wastewater in example 1, the wastewater denitrification treatment was performed according to the method in example 1, and the differences mainly include the following: in the regeneration process of the ion exchange resin, 2% sodium chloride solution is used for regeneration, and the volume of the sodium chloride solution required by single-batch resin regeneration is 2 times of the volume of the resin; in the denitrification process of the regenerated liquid, a certain amount of sodium acetate solution is added as a denitrification carbon source, the salt content of the added wastewater is 1.5%, the concentration of sodium acetate is 200-350 mg/L, and the rest processes refer to the steps in the example 1. And (3) processing results: and finally, the concentration of the nitrate nitrogen in the effluent is 2-5 mg/L, the concentration of COD is 35-45 mg/L, and the comparison result shows that if sodium acetate is used as a denitrification carbon source and is directly added in the denitrification process of the regenerated liquid, the concentration of the nitrate nitrogen and the concentration of COD in the effluent fluctuate greatly, the treatment effect is unstable and the treatment effect is relatively poor.
Example 2
The wastewater of the embodiment is the wastewater from an aerobic tank of an industrial sewage treatment plant, the concentration of nitrate nitrogen is 70-80 mg/L, the water temperature is 10-15 ℃, and the wastewater treatment comprises the following steps:
A. the process of removing nitrate nitrogen by ion exchange resin: firstly, the wastewater flows through strong-base anion exchange resin made in China by Pu-roliteA520E (produced by Michelia sinensis Co., Ltd., Nanjing, China) at the flow rate of 1BV/h, and the average concentration of nitrate nitrogen in the effluent of a resin adsorption tower is 10 mg/L;
B. the regeneration process of the ion exchange resin comprises the following steps: and (3) outputting the saturated resin in the ion exchange resin adsorption tower to a resin regenerator, controlling the temperature of the regenerator to be 25-35 ℃, and regenerating the resin by using 8% sodium acetate solution, wherein the volume of the sodium acetate solution required by single-batch resin regeneration is 2 times of the volume of the resin. The regenerated resin is conveyed back to the ion exchange resin adsorption tower, the regenerated liquid continues to apply the next batch of adsorption resin until the concentration of nitrate nitrogen in the regenerated liquid reaches 600mg/L, the application is stopped, and the regenerated liquid flows into a waste liquid collecting pool;
C. the denitrification process of the regenerated liquid comprises the following steps: biochemical tail water and regeneration liquid are pumped into a denitrification reactor filled with denitrifying and denitrifying bacteria composite filler disclosed in Chinese patent application publication No. CN201910522308.5 according to a ratio of 8:1, the total salt content in mixed water is 1.4%, the pH value of the denitrification reactor is controlled to be 7.0-8.0, the HRT (Rockwell hardness) of the reactor is 120min, the concentration of nitrate nitrogen in effluent of the reactor is lower than 1mg/L, the effluent of the reactor is pumped into an anoxic zone of a biochemical pool by a pump, the biodegradability of wastewater is improved, and the denitrification removal rate of the anoxic pool is improved by 15%.
D. Deep denitrification in a denitrification filter tank: the effluent of the resin adsorption tower flows into a denitrification filter tank, HRT is carried out for 20min, so that the concentration of the final effluent nitrate nitrogen is stabilized within 1.0 mg/L.
Example 3
The wastewater of the embodiment is the wastewater from an aerobic tank of an industrial sewage treatment plant, the concentration of nitrate nitrogen is 30-50 mg/L, the water temperature is 10-15 ℃, and the wastewater treatment comprises the following steps:
A. the process of removing nitrate nitrogen by ion exchange resin: firstly, the wastewater flows through strong-base anion exchange resin made in China by Pu-roliteA520E (produced by Michelia sinensis Co., Ltd., Nanjing, China) at the flow rate of 4BV/h, and the average concentration of nitrate nitrogen in the effluent of a resin adsorption tower is 5 mg/L;
B. the regeneration process of the ion exchange resin comprises the following steps: and (3) outputting the saturated resin in the ion exchange resin adsorption tower to a resin regenerator, controlling the temperature of the regenerator to be 25-35 ℃, and regenerating the resin by using a 5% sodium acetate solution, wherein the volume of the sodium acetate solution required by the single-batch resin regeneration is 2 times of the volume of the resin. The regenerated resin is conveyed back to the ion exchange resin adsorption tower, the regenerated liquid continues to apply the next batch of adsorption resin until the concentration of nitrate nitrogen in the regenerated liquid reaches 400mg/L, the application is stopped, and the regenerated liquid flows into a waste liquid collecting pool;
C. the denitrification process of the regenerated liquid comprises the following steps: biochemical tail water and regenerated liquid are pumped into a denitrification reactor filled with denitrifying and denitrifying bacteria composite filler disclosed in Chinese patent application publication No. CN201910522308.5 according to a ratio of 5:1, the total salt content in the mixed water is 1.5%, the pH value of the denitrification reactor is controlled to be 7.0-8.0, the HRT of the reactor is 100min, the concentration of nitrate nitrogen in the effluent of the reactor is lower than 1mg/L, the effluent of the reactor enters an anoxic zone of a biochemical pool by a pump, the biodegradability of wastewater is improved, and the denitrification removal rate of the anoxic pool is improved by 18%.
D. Deep denitrification in a denitrification filter tank: the effluent of the resin adsorption tower flows into a denitrification filter tank, HRT is carried out for 20min, so that the concentration of the final effluent nitrate nitrogen is stabilized within 1.0 mg/L.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (10)
1. A resin coupling denitrification denitrogenation method is characterized in that a regenerant containing sodium acetate is used for regenerating resin, the regenerated resin is used for carrying out adsorption treatment on nitrogen-containing wastewater, and the nitrogen-containing wastewater after adsorption treatment is introduced into a denitrification reactor for denitrification denitrogenation.
2. The method for denitrification by resin coupling according to claim 1, comprising the following steps:
(A) and the process of removing nitrate nitrogen by using ion exchange resin: pumping the wastewater with the nitrate nitrogen content of 10-80 mg/L into a resin adsorption tower, wherein the concentration of the nitrate nitrogen in the effluent of the resin adsorption tower reaches 0-20 mg/L;
(B) and the regeneration process of the ion exchange resin: outputting saturated resin in the ion exchange resin adsorption tower to a resin regenerator, conveying the regenerated resin back to the ion exchange resin adsorption tower, and allowing regenerated liquid to flow into a waste liquid collecting tank;
(C) and the regeneration liquid denitrification process: pumping biochemical tail water and a regeneration liquid into a denitrification reactor filled with a denitrification and denitrification composite filler, controlling the pH value of the denitrification reactor to be 7.0-8.0, and HRT (high-temperature thermal transfer) of the denitrification reactor for 20-120 min to finish removal of nitrate nitrogen of regenerated waste liquid, wherein the concentration of the nitrate nitrogen of effluent of the denitrification reactor is lower than 1mg/L, and pumping effluent of the denitrification reactor into an anoxic zone of a biochemical pool;
(D) and deeply denitrifying in a denitrification filter: and introducing the effluent of the resin adsorption tower into a denitrification filter to ensure that the concentration of the nitrate nitrogen in the final effluent is 0-1 mg/L.
3. The method of claim 2, wherein the content of nitrate nitrogen in the wastewater to be treated in the step A is 10-80 mg/L, and the temperature of the wastewater is 10-15 ℃.
4. The method of claim 2, wherein the flow rate of the resin adsorption tower in the step A is controlled to be 1-6 BV/h.
5. The method of claim 2, wherein the concentration of nitrate nitrogen in the effluent of the resin adsorption tower in the step A is 3-25 mg/L.
6. The method of claim 2, wherein the temperature of the resin regenerator in step B is controlled to be 25-35 ℃, and the volume of the sodium acetate solution required by a single batch of resin regeneration is 1-3 times of the volume of the resin.
7. The method of claim 2, wherein the regenerated liquid in step B is continuously applied to the next batch of adsorbent resin until the nitrate nitrogen concentration in the regenerated liquid reaches 200-600 mg/L.
8. The method for denitrification by resin coupling according to claim 2, wherein in the step B, 2% -8% sodium acetate solution is used for resin regeneration.
9. The method for denitrification by resin coupling according to claim 2, wherein the volume ratio of the biochemical tail water to the regeneration liquid in the step C is (2-8): 1, mixing to meet the requirement that the total salt content in the mixed water is 1-2 percent.
10. The method of claim 2, wherein the denitrification filter in step D is HRT 15-30 min as a further improvement of the invention.
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