CN116589091A - Advanced nitrogen and phosphorus removal AOA water treatment system and water treatment method thereof - Google Patents
Advanced nitrogen and phosphorus removal AOA water treatment system and water treatment method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 37
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims description 46
- 229910052698 phosphorus Inorganic materials 0.000 title claims description 46
- 239000011574 phosphorus Substances 0.000 title claims description 46
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 15
- 239000010802 sludge Substances 0.000 claims abstract description 141
- 238000004062 sedimentation Methods 0.000 claims abstract description 48
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000010992 reflux Methods 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 3
- 239000010865 sewage Substances 0.000 claims description 30
- 239000011259 mixed solution Substances 0.000 claims description 25
- 238000005273 aeration Methods 0.000 claims description 18
- 239000006228 supernatant Substances 0.000 claims description 14
- 238000000855 fermentation Methods 0.000 claims description 12
- 230000004151 fermentation Effects 0.000 claims description 12
- 229910002651 NO3 Inorganic materials 0.000 claims description 11
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 11
- 239000002351 wastewater Substances 0.000 claims description 6
- 230000003301 hydrolyzing effect Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 230000003851 biochemical process Effects 0.000 abstract description 2
- 241000894006 Bacteria Species 0.000 description 34
- 230000000694 effects Effects 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 150000004676 glycans Chemical class 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229920001282 polysaccharide Polymers 0.000 description 9
- 239000005017 polysaccharide Substances 0.000 description 9
- 230000001546 nitrifying effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 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 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003834 intracellular effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 125000001477 organic nitrogen group Chemical group 0.000 description 3
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 229920002527 Glycogen Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- IPQVRLSXWJPESU-UHFFFAOYSA-N [N].ON=O Chemical compound [N].ON=O IPQVRLSXWJPESU-UHFFFAOYSA-N 0.000 description 1
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229940096919 glycogen Drugs 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 238000005728 strengthening 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
- 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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- 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
- C02F3/308—Biological phosphorus removal
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Water Supply & Treatment (AREA)
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Abstract
The application relates to an AOA water treatment system for deep denitrification and dephosphorization and a water treatment method thereof, which are sequentially provided with a pre-anaerobic zone, an aerobic zone, an anoxic zone, a post-anoxic zone and a secondary sedimentation tank, wherein the zones are sequentially connected through pipelines according to the sequence, and valves are arranged on communication pipelines of the two zones; wherein: the bottom of the secondary sedimentation tank is provided with a return pipeline of the sludge, the return pipeline is communicated with the pre-anaerobic zone and the anoxic zone, and the return pipeline is provided with a valve at the position close to the sludge inlet of the pre-anaerobic zone and the sludge inlet of the anoxic zone. In order to overcome the defects of an AOA main flow process, the reflux sludge of the AOA water treatment system for deep denitrification and dephosphorization is divided into two paths, the main flow process is optimized by adopting a side flow process, an independent pre-anaerobic zone is arranged on a reflux sludge R1 line, and the reflux sludge enters an anaerobic zone on the main flow line after a complex biochemical process; and the return sludge R2 directly returns to the anoxic zone to improve the MLSS so as to increase the total amount of carbon sources in denitrification and improve the denitrification efficiency.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to an AOA water treatment system for deep denitrification and dephosphorization and a water treatment method thereof.
Background
At present, the emission standard of municipal wastewater treatment plants is more and more strict, but the existing denitrification and dephosphorization process is difficult to meet the strict standard in a mode of energy conservation, consumption reduction and low cost, and the wastewater treatment technology enters a low-carbon deep denitrification and dephosphorization stage. Municipal wastewater has insufficient carbon source, carbon source competition exists in denitrification and dephosphorization, and the removal efficiency is low. Widely used A 2 The O series pre-denitrification process has more problems, nitrate nitrogen carried by the return sludge inhibits anaerobic phosphorus release, the return nitrifying liquid carries higher dissolved oxygen to damage the anoxic denitrification environment, the return energy consumption is higher, and the nitrogen and phosphorus in the effluent are difficult to reach the standard; thus, how to economically and efficiently realize the deep removal of nitrogen and phosphorus from low-carbon source sewage is a great challenge.
Anaerobic/Aerobic/Anoxic-Anaerobic/Aerobic/Anoxa (AOA) technology is a novel technology for denitrification and dephosphorization by utilizing carbon sources in phosphorus accumulating bacteria and polysaccharide bacteria, and has advantages and application prospects in the aspect of low-C/N urban sewage treatment. The conversion of the anaerobic zone activated sludge microbial decomposition absorption external carbon source into intracellular carbon source is the energy source of aerobic phosphorus absorption and anoxic denitrification in the AOA process, so that the core of the AOA process is the conversion and storage of the carbon source by functional bacteria in the anaerobic zone, and the strengthening of carbon storage is an effective way for realizing deep denitrification and dephosphorization. The sludge double-reflux AOA technology is added with a second sludge reflux based on the traditional single-sludge AOA technology, introduces high MLSS at the bottom of a secondary sedimentation tank, and contains sludge of partial sludge fermentation products, so that the total amount of carbon sources and the amount of additional carbon sources in an anoxic zone are improved, and the laboratory-scale deep denitrification is realized. However, the existing sludge double-reflux AOA process has the following technical problems: (1) At present, the sludge is more stored with internal carbon sources only by increasing anaerobic residence time, so that the loss of the carbon sources can be caused; (2) Nitrate nitrogen carried by the return sludge damages the anaerobic phosphorus release environment, so that the phosphorus removal effect is poor; (3) The AOA series process is that the mixed liquid in the aerobic zone flows into a secondary sedimentation tank, the AOA endogenous denitrification rate is low, and the anoxic residence time is long, so that the sludge sedimentation and concentration performance is poor, and the sludge yield is high; (4) The residence time of the sludge at the bottom of the secondary sedimentation tank on the engineering is generally lower than 2 hours, and the residence time is shorter under the condition of double sludge reflux, so that the sludge fermentation effect is weaker.
Disclosure of Invention
The application provides an AOA water treatment system for deep denitrification and dephosphorization and a water treatment method thereof; the method can further improve the denitrification and dephosphorization effects and the sludge sedimentation and concentration effects.
In a first aspect, the application provides an AOA water treatment system for deep denitrification and dephosphorization, which is sequentially provided with a pre-anaerobic zone, an aerobic zone, an anoxic zone, a rear anoxic zone and a secondary sedimentation tank, wherein the zones are sequentially connected through pipelines according to the sequence, and valves are arranged on communication pipelines of the two zones; wherein: the bottom of the secondary sedimentation tank is provided with a return pipeline of the sludge, the return pipeline is communicated with the pre-anaerobic zone and the anoxic zone, and the return pipeline is provided with a valve at the position close to the sludge inlet of the pre-anaerobic zone and the sludge inlet of the anoxic zone.
By adopting the technical scheme, on the basis of the traditional AOA water treatment system, a pre-anaerobic zone is additionally arranged, wherein the pre-anaerobic zone is mainly used for pre-treating the returned sludge R1 returned to the anaerobic zone, and the pre-treatment is mainly used for consuming dissolved oxygen in the sludge, reducing the nitrate content in the sludge and increasing the contents of organic matters (rbCOD) and Volatile Fatty Acids (VFAs); when the pretreated return sludge R1 is mixed with sewage in an anaerobic zone, the ammoniated bacteria can accelerate the decomposition and conversion of organic nitrogen into ammoniacal nitrogen, meanwhile, the polysaccharide bacteria and the phosphorus accumulating bacteria can rapidly and efficiently finish the storage of an internal carbon source, and meanwhile, the phosphorus accumulating bacteria release phosphorus, so that the stay time of the anaerobic zone is shortened, and the loss of the carbon source caused by a time process is avoided.
The application is additionally provided with a rear anoxic zone on the basis of the traditional AOA water treatment system, and the purpose of the rear anoxic zone is mainly to blow off N in the mixed liquid by short-time aeration in the rear anoxic zone 2 Prevent denitrification or anaerobic phosphorus release in the sludge secondary sedimentation tank; thereby ensuring that the concentration performance of the sludge in the secondary sedimentation tank is higherGood. According to the application, the pre-anaerobic zone and the post-anoxic zone are additionally arranged, so that the nitrogen and phosphorus removal effect can be obviously improved.
Preferably, the anaerobic zone is provided with a sewage inlet; the secondary sedimentation tank is provided with a water outlet and a sludge outlet.
By adopting the technical scheme, sewage enters from the anaerobic zone and cannot enter the pre-anaerobic zone, so that the pretreatment of the return sludge R1 is not affected; the water for denitrification and dephosphorization in the secondary sedimentation tank needs to be further subjected to subsequent advanced treatment through a water outlet, and the sludge in the secondary sedimentation tank may be discharged quantitatively at regular intervals.
In a second aspect, the present application provides a method of treating wastewater by an AOA water treatment system for deep denitrification and dephosphorization, comprising the steps of:
s1, carrying out hydrolytic fermentation and endogenous denitrification on return sludge R1 in a pre-anaerobic zone to obtain pretreated return sludge R1;
s2: the pretreated return sludge R1 in the step S1 enters an anaerobic zone through a pipeline, meanwhile, sewage is pumped into a water inlet of the anaerobic zone, endogenous carbon and phosphorus are stored in the anaerobic zone, the mixed solution then enters an aerobic zone, and the mixed solution enters an anoxic zone after nitrification and phosphorus removal in the aerobic zone;
s3: pumping return sludge R2 into the anoxic zone, and deeply removing nitrogen through endogenous denitrification after the return sludge R2 is further mixed with the mixed solution; after the treatment is finished, the mixed solution enters a post anoxic zone;
s4: short-time aeration in the post anoxic zone to blow off N in the mixed solution 2 Then enters a secondary sedimentation tank;
s5: the mixed solution is separated into supernatant and settled sludge after being precipitated and concentrated in a secondary sedimentation tank, and the supernatant enters a deep treatment system for subsequent treatment; the partially settled activated sludge is divided into return sludge R1 and return sludge R2 through a circulating pipeline and respectively returns to the pre-anaerobic zone and the anoxic zone; and the residual sludge is periodically emptied.
By adopting the technical scheme, in the method of the application, the sludge R is returned 1 Hydrolysis of complex organic matter occurs in a pre-anaerobic zoneThe reactions such as fermentation, denitrification and deoxidation can fully utilize the carbon source of the inlet water in the anaerobic zone, strengthen the endogenous denitrification, reduce the inhibition of dephosphorization and reduce the sludge yield. The anaerobic zone has deep anaerobic environment, low nitrate concentration, sludge hydrolysis fermentation product and water inlet carbon source, the polysaccharide bacteria and the phosphorus accumulating bacteria can rapidly and efficiently store carbon, and the phosphorus accumulating bacteria can finish phosphorus release, so that the required anaerobic zone time is shorter. The aerobic zone is rich in nitrifying bacteria with longer sludge age (because of containing return sludge R1), the aerobic nitrifying rate is high, and the phosphorus accumulating bacteria consume an excessive amount of internal carbon source to absorb phosphorus, so that ammonia nitrogen and phosphate are removed. In the anoxic zone, the sludge R is returned by the return flow 2 The sludge concentration is improved, the total amount of denitrifying polysaccharide bacteria and phosphorus accumulating bacteria is increased, the endogenous denitrification effect is enhanced, and the deep denitrification is realized. Blowing off N attached to sludge in a rear anoxic zone through short-time aeration 2 And properly supplements dissolved oxygen, thereby not only preventing denitrification or phosphorus release of sludge at the bottom of the secondary sedimentation tank, but also improving the sedimentation and concentration performance of the sludge. R alone in the return sludge at the bottom of the secondary sedimentation tank 1 Flows through the pre-anaerobic zone for pretreatment and then enters the anaerobic zone, and the sludge R is returned 2 Then directly enters an anaerobic zone to carry out endogenous denitrification, so as to prevent endogenous denitrifying bacteria from being in a starvation state.
Preferably, in the step S1, the nitrate content in the hydrolytic fermentation and endogenous denitrification to return sludge R1 is <1mg/L; the rbCOD is increased by more than 5mg/L.
By adopting the technical scheme, the content of nitrate is controlled to be lower than 1mg/L through the nitration reaction, so that the influence of excessive nitrate on the phosphorus release environment of the anaerobic zone can be avoided, the endogenous carbon storage speed of the anaerobic zone can be accelerated by increasing the rbCOD, the stay time of the anaerobic zone can be shortened to a great extent, and the overlength of time is avoided, so that the consumption of carbon sources is caused.
Preferably, in the step S2, the reflux amount of the reflux sludge R1 is 90 to 110% of the volume of the sewage inflow.
By adopting the technical scheme, the application can reflux the ratio of the sludge R1 to the water inflow of the sewage, ensure the water treatment effect and improve the water treatment efficiency.
Preferably, in the step S3, the reflux amount of the return sludge R2 is 90 to 110% of the volume of the sewage inflow.
By adopting the technical scheme, the nitrifying speed of the anoxic zone can be accelerated by controlling the sample injection amount of the return sludge R2, so that the overall water treatment effect and speed can be improved.
Preferably, in the step S4, the short-time aeration time is 0.5-1 h, and DO <0.5mg/L after aeration is ensured.
By adopting the technical scheme, the short-time aeration time can ensure the sedimentation speed of the sludge in the secondary sedimentation tank and promote the sedimentation concentration effect.
Preferably, the supernatant is subjected to advanced treatment to achieve quasi-four standards, wherein TN is less than or equal to 10 mg/L.
In summary, the present application includes at least one of the following beneficial technical effects:
1. in order to overcome the defects of an AOA main flow process, the reflux sludge of the AOA water treatment system for deep denitrification and dephosphorization is divided into two paths, the main flow process of an AOA biochemical tank-secondary sedimentation tank is optimized by adopting a side flow process, and the reflux sludge R is treated by the method 1 An independent pre-anaerobic zone is arranged on the main line, and enters the anaerobic zone on the main line after a complex biochemical process; return sludge R 2 Then directly flows back to the anoxic zone to improve the MLSS so as to increase the total amount of carbon sources in denitrification and improve the denitrification efficiency.
2. The AOA water treatment system for deep denitrification and dephosphorization in the application is added with a post anoxic zone, the post anoxic zone is subjected to short-time aeration to improve the sedimentation and concentration performances of sludge so as to obtain high-concentration return sludge, the effluent quality is ensured to reach the standard, the endogenous denitrification rate is lower than that of the conventional exogenous denitrification, the AOA process needs longer anoxic residence time, and meanwhile, in order to quickly transit from an aerobic state to an anoxic state, the tail end of the aerobic zone generally adopts a low-dissolved oxygen strategy, so that the active sludge at the tail end of the anoxic zone is easy to carry a large amount of reduced N 2 And the content of dissolved oxygen is very low, and the condition can be improved by rapid aeration, so that the sludge-water separation in the secondary sedimentation tank is facilitated.
3. The AOA water treatment system and treatment for deep denitrification and dephosphorization in the applicationIn the method, the treatment system at least comprises a pre-anaerobic zone, an aerobic zone, an anoxic zone, a post-anoxic zone and a secondary sedimentation tank, and the sludge R is returned 1 Firstly, the waste water enters a pre-anaerobic zone, the activated sludge is adsorbed and mixed with particulate organic matters, microbial thallus residues and the like carried by the raw waste water, and part of the waste water is hydrolyzed and fermented by facultative bacteria and anaerobic bacteria to generate rbCOD and VFAs so as to supplement the defects of the water inlet rbCOD and VFAs, strengthen the utilization of the organic matters in the raw waste water, reduce the sludge yield, simultaneously, the polysaccharide bacteria and the phosphorus accumulating bacteria in the sludge are continuously subjected to endogenous denitrification, and reduce the backflow sludge R 1 The high MLSS activated sludge endogenous respiration generates great demand for oxygen in the middle nitrate nitrogen concentration; pretreatment of effluent and return sludge R 1 After mixing, the anaerobic zone has a deep anaerobic environment, low nitrate concentration, sludge hydrolysis fermentation products and a water inlet carbon source, so that organic matters in the original sewage are rapidly decomposed and converted into rbCOD and VFAs (volatile oxygen demand) and comprise ammoniation of organic nitrogen, and polysaccharide bacteria and phosphorus accumulating bacteria absorb and utilize an external carbon source and convert intracellular glycogen (Gly) into Polyhydroxyalkanoate (PHA) to finish the storage of the internal carbon source, and the phosphorus accumulating bacteria release phosphorus along with the storage of the internal carbon source; in the aerobic zone, nitrifying bacteria in the activated sludge convert ammonia nitrogen into nitrous acid nitrogen or nitric acid nitrogen, phosphorus accumulating bacteria consume PHA to produce energy to excessively absorb phosphorus, so that nitrification and dephosphorization are realized, and denitrifying polysaccharide bacteria and phosphorus accumulating bacteria consume PHA and part of external carbon sources are converted into Gly; in the anoxic zone, the mixed liquor and the return sludge R 2 After mixing, the concentration of the sludge is improved, the total amount of the polysaccharide bacteria and the phosphorus accumulating bacteria in the sludge is increased, and the denitrification rate driven by intracellular Gly is improved; in the post anoxic zone, N in the mixed solution is blown off through short-time aeration 2 The dissolved oxygen content is controlled, denitrification or anaerobic phosphorus release is prevented from occurring in the sludge secondary sedimentation tank, and sedimentation and concentration of the sludge are facilitated, so that high MLSS reflux sludge is obtained; after mud-water separation of the secondary sedimentation tank and subsequent advanced treatment, the quality of effluent water can reach four standards, wherein TN is less than or equal to 10 mg/L.
4. The application improves the utilization of the original sewage carbon source and the storage of the internal carbon source, does not need to add the carbon source, reduces the sludge yield, has low operation cost, good operation stability and simple and easy operation flow, and can realize deep denitrification and dephosphorization.
Drawings
FIG. 1 is a schematic diagram of an AOA water treatment system for deep denitrification and dephosphorization according to the present application.
Figure 2 is a process flow diagram of the present application.
FIG. 3 is a graph of performance tests of secondary sedimentation tank effluent during the AOA pilot plant in example 2 of the present application.
Wherein: 1-a pre-anaerobic zone; 2-anaerobic zone; 3-an aerobic zone; 4-anoxic zone; 5-post anoxic zone; 6-a secondary sedimentation tank; 7-valve; 21-water inlet, 61-supernatant outlet, 62-sludge outlet, 63 sludge return pipe.
Detailed Description
The technical solutions and advantages of the present application will be clearly and fully described below with reference to the accompanying drawings and detailed description, it being apparent that the examples described below are some, but not all, examples of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer.
Example 1
The structural schematic diagram of the AOA water treatment system for deep denitrification and dephosphorization is shown in figure 1, and the system sequentially comprises a pre-anaerobic zone 1, an anaerobic zone 2, an aerobic zone 3, an anoxic zone 4, a post-anoxic zone 5 and a secondary sedimentation tank 6; the partitions are interconnected by a pipeline, and a valve 7 is arranged on the pipeline. The bottom of the secondary sedimentation tank 6 is provided with a sludge return pipe 63, the sludge return pipe 63 is communicated with the pre-anaerobic zone 1 and the anoxic zone 4, and the sludge return pipe 63 is provided with valves at a sludge inlet close to the pre-anaerobic zone 1 and a sludge inlet close to the anoxic zone 4. The top of the anaerobic zone 2 is provided with a water inlet 21; the upper part of the bottom of the secondary sedimentation tank 6 is provided with a supernatant outlet 61, and the lower part is provided with a sludge outlet 32.
Example 2
The flow chart of the sewage treatment method by the advanced nitrogen and phosphorus removal AOA water treatment system in example 1 is shown in FIG. 2, in this example, the actual water inflow of a large sewage plant in a southern city is taken as the treatment object, and a pilot plant is designed with a scale of 100 m/d (the specific conditions are not noted in the example, and the sewage treatment method is carried out according to the conventional AOA conditions).
The method specifically comprises the following steps:
s1, carrying out hydrolytic fermentation and endogenous denitrification on return sludge R1 (the return flow of the return sludge R1 is controlled to be 100% of the volume of the sewage sample injection) in a pre-anaerobic zone 1 to obtain pretreated return sludge R1, wherein the pretreatment time is 1.7h, the nitrate content in the pretreated return sludge R1 is about 0.4mg/L after the pretreatment is finished, and the rbCOD is increased by about 10 mg/L;
s2: the pretreated return sludge R1 in the step S1 enters an anaerobic zone 2 through a pipeline, meanwhile, sewage is pumped into a water inlet of the anaerobic zone 2, endogenous carbon and phosphorus are stored in the anaerobic zone 2 and released (the time is 1.7 h), the mixed solution then enters an aerobic zone 3, and after nitrification and phosphorus removal are carried out in the aerobic zone 3, the mixed solution is carried out in an anoxic zone 4;
s3: pumping return sludge R2 into the anoxic zone 4 (controlling the return amount of the return sludge R2 to be 100% of the volume of the sewage sample injection amount), and further mixing the return sludge R2 with the mixed solution to perform deep nitrogen removal through endogenous denitrification; after the treatment is finished, the mixed solution enters a rear anoxic zone 5;
s4: short aeration in post anoxic zone 5 to blow off N in the mixed solution 2 (aeration time is 0.8h, DO after aeration is 0.1 mg/L), and the mixed solution after aeration enters a secondary sedimentation tank 6;
s5: the mixed solution is separated into supernatant and settled sludge after being precipitated and concentrated in a secondary sedimentation tank 6, and the supernatant enters a deep treatment system for subsequent treatment; the partially settled activated sludge is divided into return sludge R1 and return sludge R2 through a circulating pipeline and respectively returns to the pre-anaerobic zone 1 and the anoxic zone 4; and the residual sludge is periodically emptied.
In this embodiment, the specific water quality of the inlet water is as follows: COD is 93-378 mg/L, TN is 17.41-56.91 mg/L, NH 3 -N is 12.04-38.93 mg/L and TP is 1.31-6.00 mg/L; the system was operated according to the above method, and during the steady operation, the secondary sedimentation tank supernatant water outlet COD, TN, NH was tested daily 3 N, TP, whose structure is shown in FIG. 3, after 24 days of operation, COD, TN, NH 3 Average of N, TPThe values were 20.1, 6.77, 0.64 and 0.34. 0.34 mg/L, and the average removal rates were 92%, 84%, 97% and 91%, respectively. Under the condition of no external carbon source, after the secondary sedimentation tank effluent is subjected to advanced treatment, the effluent indexes can reach four standard types, wherein TN is less than or equal to 10 mg/L.
Comparative example 1
Substantially the same as in example 2, except that the pre-anaerobic zone 1 and the post-anoxic zone 2 were not added; the specific process is as follows:
s1, introducing return sludge R1 into an anaerobic zone through a pipeline (controlling the return amount of the return sludge R1 to be 100% of the volume of the sewage sample), pumping sewage into a water inlet of the anaerobic zone, storing endogenous carbon and releasing phosphorus in the anaerobic zone (the time is 3.4 h), introducing the mixed solution into an aerobic zone, nitrifying and dephosphorizing in the aerobic zone, and introducing the mixed solution into an anoxic zone;
s3: pumping return sludge R2 into the anoxic zone (the return amount of the return sludge R2 is controlled to be 100% of the volume of the sewage sample injection amount), and performing deep nitrogen removal through endogenous denitrification after the return sludge R2 is further mixed with the mixed solution; after the treatment is finished, the mixed solution enters a secondary sedimentation tank;
s5: the mixed solution is separated into supernatant and settled sludge after being precipitated and concentrated in a secondary sedimentation tank, and the supernatant enters a deep treatment system for subsequent treatment; the partially settled activated sludge is divided into return sludge R1 and return sludge R2 through a circulating pipeline and respectively returns to the pre-anaerobic zone and the anoxic zone; and the residual sludge is periodically emptied.
Comparative example 1 was run simultaneously with example 1, as was the quality of the incoming water; the system was operated according to the method in this comparative example, and during the steady operation, the secondary sedimentation tank supernatant water outlet COD, TN, NH was tested daily 3 N, TP, water output index COD, TN, NH during 24 days of steady operation 3 The average values of-N, TP are 20.7mg/L, 10.87mg/L, 0.68 mg/L and 0.51mg/L, and the average removal rates are 92%, 76%, 96% and 89% respectively.
From the comparison of the effects of example 2 and comparative example 1, the pre-anaerobic zone 1 and the post-anoxic zone 5 were added in example 2, and the denitrification and dephosphorization effects of the water treatment were significantly improved, probably because:
return sludge R 1 After hydrolysis and fermentation of facultative bacteria and anaerobic bacteria in the pre-anaerobic zone, the waste water treatment device can generate easily biodegradable organic matters (rbCOD) and Volatile Fatty Acids (VFAs), can effectively supplement the defects of the rbCOD and the VFAs of inflow water, strengthen dephosphorization, efficiently utilize partial complex organic matters in sludge and reduce the sludge yield; in the pre-anaerobic zone, the facultative bacteria have the side effect of consuming the dissolved oxygen of the returned sludge, and simultaneously, the returned nitrate is removed under the action of endogenous denitrifying bacteria, so that the nitrate content flowing into the anaerobic zone is reduced, and the inhibition of anaerobic phosphorus release is reduced.
After the water inlet is mixed with the returned sludge R1 subjected to the pre-anaerobic pretreatment, the anaerobic zone is provided with a deep anaerobic environment, low nitrate concentration, sludge hydrolysis fermentation products and a water inlet carbon source, the ammoniated bacteria decompose and convert organic nitrogen into ammoniacal nitrogen, meanwhile, the polysaccharide bacteria and the phosphorus accumulating bacteria quickly and efficiently finish internal carbon source storage, and meanwhile, the phosphorus accumulating bacteria release phosphorus, so that the stay time of the anaerobic zone is shortened, the carbon source consumption caused by overlong time is avoided, and the subsequent aerobic zone reaction activity is caused.
Aeration is carried out in the anoxic zone after the addition: the post anoxic zone blows off N in the mixed liquid through short-time aeration 2 The sludge has good sedimentation and concentration performance, and denitrification or anaerobic phosphorus release in the sludge secondary sedimentation tank is prevented.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. An AOA water treatment system for deep denitrification and dephosphorization is characterized in that a pre-anaerobic zone, an aerobic zone, an anoxic zone, a post-anoxic zone and a secondary sedimentation tank are sequentially arranged, the above zones are sequentially connected through pipelines according to the sequence, and valves are arranged on communication pipelines of the two zones; wherein: the bottom of the secondary sedimentation tank is provided with a return pipeline of the sludge, the return pipeline is communicated with the pre-anaerobic zone and the anoxic zone, and the return pipeline is provided with a valve at the position close to the sludge inlet of the pre-anaerobic zone and the sludge inlet of the anoxic zone.
2. The advanced nitrogen and phosphorus removal AOA water treatment system of claim 1, wherein the anaerobic zone is provided with a sewage inlet; the secondary sedimentation tank is provided with a water outlet and a sludge outlet.
3. A method of treating wastewater by the deep nitrogen and phosphorous removal AOA water treatment system of claim 1 or 2, comprising the steps of:
s1, carrying out hydrolytic fermentation and endogenous denitrification on return sludge R1 in a pre-anaerobic zone to obtain pretreated return sludge R1;
s2: the pretreated return sludge R1 in the step S1 enters an anaerobic zone through a pipeline, meanwhile, sewage is pumped into a water inlet of the anaerobic zone, endogenous carbon and phosphorus are stored in the anaerobic zone, the mixed solution then enters an aerobic zone, and the mixed solution enters an anoxic zone after nitrification and phosphorus removal in the aerobic zone;
s3: pumping return sludge R2 into the anoxic zone, and deeply removing nitrogen through endogenous denitrification after the return sludge R2 is further mixed with the mixed solution; after the treatment is finished, the mixed solution enters a post anoxic zone;
s4: short-time aeration in the post anoxic zone to blow off N in the mixed solution 2 Then enters a secondary sedimentation tank;
s5: the mixed solution is separated into supernatant and settled sludge after being precipitated and concentrated in a secondary sedimentation tank, and the supernatant enters a deep treatment system for subsequent treatment; the partially settled activated sludge is divided into return sludge R1 and return sludge R2 through a circulating pipeline and respectively returns to the pre-anaerobic zone and the anoxic zone; and the residual sludge is periodically emptied.
4. A method for treating sewage by deep nitrogen and phosphorus removal AOA water treatment system according to claim 3, characterized in that in step S1, the nitrate content in hydrolytic fermentation and endogenous denitrification to return sludge R1 is <1mg/L; the rbCOD is increased by more than 5mg/L.
5. The method for treating sewage by an AOA water treatment system for deep denitrification and dephosphorization according to claim 3, wherein in the step S2, the reflux amount of the reflux sludge R1 is 90-110% of the volume of the sewage inflow.
6. The method for treating sewage by an AOA water treatment system for deep denitrification and dephosphorization according to claim 3, wherein in the step S3, the reflux amount of the reflux sludge R2 is 90-110% of the volume of the sewage inflow.
7. The method for treating sewage by an AOA water treatment system for deep denitrification and dephosphorization according to claim 3, wherein in the step S4, the short-time aeration time is 0.5-1 h and DO is guaranteed to be less than 0.5mg/L after aeration.
8. The method for treating sewage by an AOA water treatment system for deep denitrification and dephosphorization according to claim 3, wherein the supernatant fluid is subjected to deep treatment to achieve four standard types, wherein TN is less than or equal to 10 mg/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116924567A (en) * | 2023-08-17 | 2023-10-24 | 深圳市利源水务设计咨询有限公司 | Sewage treatment system and sewage treatment method based on granular sludge |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358663A (en) * | 2011-09-21 | 2012-02-22 | 浙江大学 | Low-DO (dissolved oxygen) rear denitrification sewage treatment plant and technique |
| CN110615531A (en) * | 2019-09-16 | 2019-12-27 | 北京工业大学 | DEAMOX sludge double-reflux AOAO sewage-based deep nitrogen and phosphorus removal device and method |
| CN110615532A (en) * | 2019-09-16 | 2019-12-27 | 北京工业大学 | Device and method for simultaneous nitrogen and phosphorus removal of continuous flow municipal sewage sludge by double-reflux AOAO |
| CN113173640A (en) * | 2021-03-29 | 2021-07-27 | 江苏裕隆环保有限公司 | AOA (argon oxygen decarburization) coupled anaerobic ammonia oxidation advanced nitrogen and phosphorus removal process |
| CN113929210A (en) * | 2021-08-18 | 2022-01-14 | 北京工业大学 | Device and method for enhancing carbon source utilization and deep denitrification in mainstream municipal sewage by fermenting and producing acid through side flow sludge |
| CN113998783A (en) * | 2021-11-02 | 2022-02-01 | 海南大学 | Low-carbon nitrogen and phosphorus removal device and method for municipal sewage based on partial return sludge deep anaerobic treatment |
-
2022
- 2022-12-14 CN CN202211607900.3A patent/CN116589091A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358663A (en) * | 2011-09-21 | 2012-02-22 | 浙江大学 | Low-DO (dissolved oxygen) rear denitrification sewage treatment plant and technique |
| CN110615531A (en) * | 2019-09-16 | 2019-12-27 | 北京工业大学 | DEAMOX sludge double-reflux AOAO sewage-based deep nitrogen and phosphorus removal device and method |
| CN110615532A (en) * | 2019-09-16 | 2019-12-27 | 北京工业大学 | Device and method for simultaneous nitrogen and phosphorus removal of continuous flow municipal sewage sludge by double-reflux AOAO |
| CN113173640A (en) * | 2021-03-29 | 2021-07-27 | 江苏裕隆环保有限公司 | AOA (argon oxygen decarburization) coupled anaerobic ammonia oxidation advanced nitrogen and phosphorus removal process |
| CN113929210A (en) * | 2021-08-18 | 2022-01-14 | 北京工业大学 | Device and method for enhancing carbon source utilization and deep denitrification in mainstream municipal sewage by fermenting and producing acid through side flow sludge |
| CN113998783A (en) * | 2021-11-02 | 2022-02-01 | 海南大学 | Low-carbon nitrogen and phosphorus removal device and method for municipal sewage based on partial return sludge deep anaerobic treatment |
Non-Patent Citations (1)
| Title |
|---|
| 雍毅等主编: "《市政污泥特性与再生利用引论》", 31 May 2016, 中国环境出版社, pages: 124 - 125 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116924567A (en) * | 2023-08-17 | 2023-10-24 | 深圳市利源水务设计咨询有限公司 | Sewage treatment system and sewage treatment method based on granular sludge |
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