CN113443710A - Integrated wastewater treatment method for efficiently removing nitrogen and carbon - Google Patents
Integrated wastewater treatment method for efficiently removing nitrogen and carbon Download PDFInfo
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- CN113443710A CN113443710A CN202110729245.8A CN202110729245A CN113443710A CN 113443710 A CN113443710 A CN 113443710A CN 202110729245 A CN202110729245 A CN 202110729245A CN 113443710 A CN113443710 A CN 113443710A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 28
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 title claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 22
- 239000010802 sludge Substances 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 19
- 230000003647 oxidation Effects 0.000 claims abstract description 18
- 239000002351 wastewater Substances 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000006957 competitive inhibition Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 241000894006 Bacteria Species 0.000 description 16
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 4
- 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 3
- 238000005262 decarbonization Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-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
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011081 inoculation Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 235000010288 sodium nitrite Nutrition 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
- 235000013923 monosodium glutamate Nutrition 0.000 description 1
- 239000004223 monosodium glutamate Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 235000014101 wine Nutrition 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- 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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an integrated wastewater treatment method for efficiently denitrifying and decarbonizing, which can solve the problems that the total nitrogen is not thoroughly removed in the actual wastewater treatment project with low carbon-nitrogen ratio and high ammonia nitrogen ratio by an anaerobic ammonia oxidation process and the problem is easily subjected to competitive inhibition caused by COD (chemical oxygen demand) in the prior art; the invention inoculates acclimatized partial nitrification and anaerobic ammonia oxidation granular sludge in a certain proportion in a reactor, carries out debugging operation without other external agents, realizes the coupling of partial nitrification, anaerobic ammonia oxidation, heterotrophic denitrification and the like by controlling the difference of the sludge ages of flocculent sludge and granular sludge, and has COD, ammonia nitrogen and total nitrogen removal rates of more than 95 percent, 99 percent and 95 percent respectively after the process is stably operated.
Description
Technical Field
The invention particularly relates to an integrated wastewater treatment method for efficiently removing nitrogen and carbon, belonging to the technical field of biological wastewater treatment.
Background
With the rapid development of socioeconomic of China in recent years, the total nitrogen discharged into natural water bodies such as rivers and reservoirs rises year by year, the eutrophication problem becomes more and more serious, and the efficient removal of the total nitrogen becomes a problem to be solved urgently.
The traditional biological denitrification process is mainly based on nitrification-denitrification, and theoretically, 1gNO3The denitrification of-N requires 3.7gCOD, therefore, the C/N ratio is less than 3.7, the denitrification effect is influenced by insufficient carbon source in the denitrification process, and the operation of the nitrification-denitrification processThe problems of insufficient organic carbon source and low total nitrogen removal rate generally exist in the denitrification stage, and the standard reaching treatment of the total nitrogen in the high ammonia-nitrogen wastewater is difficult to realize under the condition of no additional organic carbon source. However, the quality of wastewater is becoming more complex, especially the lack of organic carbon source, so that part of wastewater with low carbon-nitrogen ratio, such as garbage leachate, livestock and poultry breeding wastewater, anaerobic digestion solution of municipal sewage, sludge fermentation supernatant, and deep denitrification of anaerobic effluent in the industries of starch, monosodium glutamate, wine brewing and the like, face huge challenges.
The anaerobic ammonia oxidation process is a technology which is rapidly developed to treat low-carbon source wastewater in recent years, and is one of the most economical and concise biological denitrification new processes known at present. The anaerobic ammonia oxidation reaction is a process that anaerobic ammonia oxidizing bacteria take nitrite nitrogen as an electron acceptor and oxidize ammonia nitrogen into nitrogen under anaerobic conditions, does not need an organic carbon source, and belongs to an autotrophic process. However, a certain amount of nitrate nitrogen is generated in the anaerobic ammonia oxidation process, and the actual nitrogen-containing wastewater generally contains organic pollutants, and as the nitrate nitrogen is known to be an electron acceptor for denitrification, organic matters are electron donors for denitrification, so that the research of anaerobic ammonia oxidation coupled heterotrophic denitrification is a research hotspot in recent years. However, nitrite nitrogen is also an electron acceptor for denitrification, and the presence of nitrite nitrogen may cause the denitrifying bacteria to compete with the anammox bacteria. A series of problems such as how stable the anaerobic ammonia oxidation is coupled with heterotrophic denitrification in an organic environment, how a synergistic and competitive relationship exists between denitrifying bacteria and anaerobic ammonia oxidation bacteria and the like are worth researching. Chinese patent publication No. CN103420481A discloses an anammox-coupled iso-aerobic denitrification method, specifically disclosing using anammox granular sludge as inoculation sludge; meanwhile, water is manually distributed, ammonium chloride and sodium nitrite are added, phenol is added as an organic matter, enrichment culture of anammox bacteria and heterotrophic denitrifying bacteria is realized, the competition and the synergistic relationship of the anammox bacteria and the heterotrophic denitrifying bacteria are determined, and enrichment culture of mixed flora of the anammox bacteria and the heterotrophic denitrifying bacteria is realized after a period of time. However, the method provided by the invention adds a plurality of inorganic and organic chemical external agents, such as ammonium chloride, sodium nitrite and phenol, so that the water body load is increased, and the problems of secondary pollution and the like are possibly caused; chinese patent publication No. CN105293838A discloses a method for simultaneous denitrification and decarbonization of low-carbon-source wastewater, and specifically discloses exciting and inhibiting denitrifying bacteria and anaerobic ammonium oxidizing bacteria respectively by aiming at an organic carbon source, so that the anaerobic ammonium oxidizing bacteria and the denitrifying bacteria grow differentially in different compartments in sequence, and a stepped reaction system of nitrite type denitrification-anaerobic ammonium oxidation-nitrate type denitrification is sequentially constructed in each compartment of an anaerobic baffled reactor, thereby stably treating carbon and nitrogen. However, in the method, the anaerobic reactor needs to be modified, different reaction compartments and gradient reaction systems are designed, and the process flow is long and the control process is complex.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-efficiency denitrification and decarbonization coupling technology which has high total nitrogen removal rate and low energy consumption and can effectively remove COD.
The technical scheme of the invention is as follows:
the invention provides an integrated wastewater treatment method for efficiently removing nitrogen and carbon, which specifically comprises the following steps:
s1, mixing the acclimated shortcut nitrification sludge and the anaerobic ammonium oxidation granular sludge according to the sludge dry weight ratio of 1 (2-3);
s2, inoculating the mixed sludge into a reactor, and ensuring that the sludge concentration in the inoculated reactor is 3000-5000 mg/L;
s3, preparing waste water into a reactor, wherein the reactor operates intermittently, and each operation period consists of 4 working procedures of water inlet, reaction, precipitation and water drainage; adopting manual water inlet and outlet, reacting the SBR reactor under the aeration condition, taking the DO of the system as an indicator at the reaction end point, and stopping the reaction when the DO in the system is rapidly increased and continuously higher than 1.5 mg/L;
and S4, after the aeration reaction is finished, controlling the sludge ages of the flocculent sludge and the anaerobic ammonium oxidation granular sludge to be 20-25 days and 100-120 days respectively by adjusting the sedimentation time.
Furthermore, the water filling ratio of the wastewater in the step S3 added into the reactor is 1 (2-3).
Furthermore, the pH value in the reactor is controlled to be 7.0-8.5 in the whole wastewater treatment process.
Furthermore, the reactor operates at normal temperature in the whole wastewater treatment process.
Furthermore, the DO concentration in the whole wastewater treatment process is controlled below 0.5 mg/L.
Further, the reactor is an SBR reactor.
Furthermore, the COD concentration of the wastewater inlet water in the whole wastewater treatment process is 1000-2000 mg/L, and NH is added4 +The concentration of-N is 500-1000 mg/L.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a wastewater treatment method for integrated efficient denitrification and decarbonization, which can overcome the problems that the total nitrogen removal is not thorough in practical application of an anaerobic ammonium oxidation process in the prior art and the wastewater treatment method is easy to be competitively inhibited by COD (chemical oxygen demand), and the like Ammonia nitrogen and total nitrogen can be removed simultaneously, and the removal rate respectively reaches more than 95%, 99% and 95%, so that the standard treatment of COD, ammonia nitrogen and total nitrogen is realized.
2. The treatment method provided by the invention has the advantages of simple reaction conditions, low energy consumption and short process flow, and is particularly suitable for treating wastewater with low carbon-nitrogen ratio and high ammonia nitrogen and other carbon source deficiencies.
Drawings
FIG. 1 shows the variation of ammonia nitrogen concentration before and after reaction in wastewater at different running times in the present invention;
FIG. 2 shows the COD concentration of wastewater before and after reaction at different running times in the present invention;
FIG. 3 is a graph showing the total nitrogen concentration before and after the reaction in wastewater at different running times in the present invention;
FIG. 4 is a graph showing the total nitrogen removal from wastewater at various run times in accordance with the present invention;
FIG. 5 is a diagram showing COD removal rate of wastewater at different operation times in the present invention;
Detailed Description
The invention is further described with reference to the drawings and the preferred embodiments.
Example 1
The invention provides an integrated wastewater treatment method for efficiently removing nitrogen and carbon, which specifically comprises the following steps:
s1, mixing the acclimated shortcut nitrification sludge and the anaerobic ammonia oxidation granular sludge according to the sludge dry weight ratio of 1: 3;
s2, inoculating the mixed sludge into a reactor, and ensuring the sludge concentration in the reactor after inoculation to be 3000 mg/L;
s3, preparing waste water into the reactor, wherein the operation mode of the reactor is intermittent operation, and each operation period consists of 4 working procedures of water inlet, reaction, precipitation and water drainage; manual water inlet and outlet are adopted, the SBR reactor reacts under the aeration condition, and the DO concentration is controlled below 0.5mg/L in the whole wastewater treatment process; the reaction end point takes the DO of the system as an indicator, and the reaction is stopped when the DO in the system rapidly rises and continuously exceeds 1.5 mg/L; the wastewater in the embodiment adopts simulated wastewater for simulating low-carbon-nitrogen-ratio high-ammonia-nitrogen wastewater, wherein glucose is used as a carbon source, ammonium bicarbonate is used as a nitrogen source, the COD concentration of inlet water is 1000-2000 mg/L, and NH is4 +The concentration of N is 500-1000 mg/L;
s4, after the aeration reaction is finished, discharging redundant flocculent sludge in the reactor and completely intercepting anaerobic ammonium-oxygen granular sludge by adjusting the sedimentation time, thereby realizing the differential control of the sludge ages of the flocculent sludge and the anaerobic ammonium-oxygen sludge, avoiding the competitive inhibition between denitrifying bacteria and anaerobic ammonium-oxygen bacteria, respectively controlling the sludge ages of the flocculent sludge and the anaerobic ammonium-oxygen granular sludge at 20d and 100d, and carrying out coupling action on the reactions such as short-cut nitrification, anaerobic ammonium oxidation, heterotrophic denitrification and the like in a single reactor.
In the present example, the reactor is an SBR reactor, but the treatment process of the invention is equally applicable to other types of reactors; the SBR reactor main body is a plastic bucket with cowhells, the height is 1315mm, the diameter is 1070mm, the effective solvent is 1000L, the wastewater is mixed into the SBR reactor, the water filling ratio is 1:2, the operation temperature of the SBR reactor is normal temperature, the aeration rate is controlled by a rotor flow meter, the pH value in the SBR reactor is controlled at 7.0, the DO concentration is controlled below 0.5mg/L in the operation process of the SBR reactor, each operation period consists of 4 procedures of water inlet, reaction, precipitation and water drainage, the DO of the system is mainly used as an indication index at the reaction end point, and the reaction is stopped when the DO in the system rapidly rises and is continuously higher than 1.5 mg/L; referring to fig. 1 to 4, after the debugging operation of 30d, the ammonia nitrogen concentration and the total nitrogen concentration of the water in the storage can be stabilized within 2mg/L, and the removal rate of the total nitrogen volume load reaches 1.5 kgN/(m)3D), the total nitrogen removal rate reaches more than 98%, and the COD removal rate reaches more than 98%.
Example 2
Example 2 differs from example 1 in that:
in the step S1, the acclimated shortcut nitrification sludge and the anaerobic ammonia oxidation granular sludge are mixed according to the sludge dry weight ratio of 1: 2;
inoculating the mixed sludge into a reactor in the step S2, and ensuring the sludge concentration in the inoculated reactor to be 4000 mg/L;
the wastewater in the step S3 is added into a reactor, and the water filling ratio is 1: 3;
in the step S4, the sludge ages of the flocculent sludge and the anaerobic ammonium oxidation granular sludge are respectively controlled to be 25 days and 120 days;
in example 2, the pH in the reactor was controlled to be 7.5 throughout the reaction;
in the wastewater subjected to denitrification and carbon removal by the method in the embodiment 2, the ammonia nitrogen concentration and the total nitrogen concentration in the stored water can be stabilized within 2mg/L, the total nitrogen removal rate reaches more than 95%, and the COD removal rate reaches more than 95%.
Example 3
Example 3 differs from example 1 in that:
inoculating the mixed sludge into a reactor in the step S2, and ensuring that the sludge concentration in the inoculated reactor is 5000 mg/L;
in the step S4, the sludge ages of the flocculent sludge and the anaerobic ammonia oxidation granular sludge are respectively controlled to be 22d and 110 d;
in example 3, the pH in the reactor is controlled to be 8.5 in the whole reaction process;
in the wastewater subjected to denitrification and carbon removal by the method in the embodiment 3, the ammonia nitrogen concentration and the total nitrogen concentration in the stored water can be stabilized within 2mg/L, the total nitrogen removal rate reaches more than 95%, and the COD removal rate reaches more than 95%.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. An integrated wastewater treatment method for efficiently removing nitrogen and carbon is characterized by comprising the following steps:
s1, mixing the acclimated shortcut nitrification sludge and the anaerobic ammonium oxidation granular sludge according to the sludge dry weight ratio of 1 (2-3);
s2, inoculating the mixed sludge into a reactor, and ensuring that the sludge concentration in the inoculated reactor is 3000-5000 mg/L;
s3, preparing waste water into a reactor, wherein the reactor operates intermittently, and each operation period consists of 4 working procedures of water inlet, reaction, precipitation and water drainage; adopting manual water inlet and outlet, reacting the SBR reactor under the aeration condition, taking the DO of the system as an indicator at the reaction end point, and stopping the reaction when the DO in the system is rapidly increased and continuously higher than 1.5 mg/L;
and S4, after the aeration reaction is finished, controlling the sludge ages of the flocculent sludge and the anaerobic ammonium oxidation granular sludge to be 20-25 days and 100-120 days respectively by adjusting the sedimentation time.
2. The integrated wastewater treatment method for high-efficiency denitrification and carbon removal as claimed in claim 1, wherein: and the water filling ratio of the wastewater in the step S3 added into the reactor is 1 (2-3).
3. The integrated wastewater treatment method for high-efficiency denitrification and carbon removal as claimed in claim 1, wherein: the pH value in the reactor is controlled to be 7.0-8.5 in the whole wastewater treatment process.
4. The integrated wastewater treatment method for high-efficiency denitrification and carbon removal as claimed in claim 1, wherein: the reactor is operated under normal temperature condition in the whole wastewater treatment process.
5. The integrated wastewater treatment method for high-efficiency denitrification and carbon removal as claimed in claim 1, wherein: the DO concentration in the whole wastewater treatment process is controlled below 0.5 mg/L.
6. The integrated wastewater treatment method for high-efficiency denitrification and carbon removal as claimed in claim 1, wherein: the COD concentration of wastewater inlet water in the whole wastewater treatment process is 1000-2000 mg/L, and NH4 +The concentration of-N is 500-1000 mg/L.
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2021
- 2021-06-29 CN CN202110729245.8A patent/CN113443710A/en active Pending
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Application publication date: 20210928 |