CN114524513B - Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process - Google Patents
Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process Download PDFInfo
- Publication number
- CN114524513B CN114524513B CN202210111259.8A CN202210111259A CN114524513B CN 114524513 B CN114524513 B CN 114524513B CN 202210111259 A CN202210111259 A CN 202210111259A CN 114524513 B CN114524513 B CN 114524513B
- Authority
- CN
- China
- Prior art keywords
- tank
- anaerobic
- anoxic
- autotrophic denitrification
- aerobic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000008569 process Effects 0.000 title claims abstract description 43
- 239000010865 sewage Substances 0.000 title claims abstract description 24
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 43
- 239000011593 sulfur Substances 0.000 claims abstract description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 38
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 18
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 40
- 229910052698 phosphorus Inorganic materials 0.000 claims description 40
- 239000011574 phosphorus Substances 0.000 claims description 40
- 241000894006 Bacteria Species 0.000 claims description 29
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 239000010802 sludge Substances 0.000 claims description 14
- 239000006028 limestone Substances 0.000 claims description 10
- 229920000742 Cotton Polymers 0.000 claims description 8
- 235000019738 Limestone Nutrition 0.000 claims description 8
- 229910002651 NO3 Inorganic materials 0.000 claims description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 8
- 229910021646 siderite Inorganic materials 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 5
- 239000002028 Biomass Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 235000015097 nutrients Nutrition 0.000 claims description 3
- 229920000388 Polyphosphate Polymers 0.000 claims description 2
- 239000001205 polyphosphate Substances 0.000 claims description 2
- 235000011176 polyphosphates Nutrition 0.000 claims description 2
- 210000005056 cell body Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 19
- 239000007788 liquid Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000003933 environmental pollution control Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 10
- 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 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010992 reflux Methods 0.000 description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000001632 sodium acetate Substances 0.000 description 3
- 235000017281 sodium acetate Nutrition 0.000 description 3
- 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 2
- 239000002253 acid Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical group [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 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
- 238000012851 eutrophication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
-
- 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
Landscapes
- 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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention belongs to the technical field of environmental pollution control engineering, and provides a method for treating low-C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process. Wherein, an alkalinity slow-release porous spherical shell suspended filler which can be used as an inorganic carbon source and an alkalinity slow-release source and can improve the problem of sulfate recovery in the sulfur autotrophic denitrification process is adopted in the sulfur autotrophic denitrification anoxic tank, thereby forming a moving bed form. The process has the advantages that the dephosphorization and denitrification unit is carried out, so that the competition of organic carbon sources is reduced; the biological dephosphorization effect is improved, and the dosage of a dephosphorization agent is reduced; the nitrifying liquid is not required to flow back, so that the energy consumption is effectively reduced; the recovery operation of the suspended filler is simple; sulfate in the effluent is reduced; autotrophic denitrification is adopted, and an external organic carbon source is not needed, so that the running cost is further reduced.
Description
Technical Field
The invention belongs to the technical field of environmental pollution control engineering, relates to a study of an anaerobic-aerobic-anoxic-moving bed autotrophic nitrogen removal (AOA-MBNR) process, and in particular relates to a study applied to biological nitrogen and phosphorus removal of low-C/N sewage.
Background
Nitrogen pollution is one of the important causes of eutrophication of water bodies, and has become a serious environmental problem in water ecosystems. As known from the article "present application of denitrification and dephosphorization Process in urban wastewater treatment plants in China", the conventional anaerobic-anoxic-aerobic (A 2 O) process, namely, firstly, anaerobic tank phosphorus release is carried out on sewage, then heterotrophic denitrifying bacteria in an anoxic tank use organic matters as carbon sources to reduce nitrate nitrogen and nitrite nitrogen in the reflux nitrifying liquid into nitrogen, thereby achieving the aim of biological denitrification. Finally, ammonia nitrogen nitrification and excessive phosphorus absorption of phosphorus accumulating bacteria are realized in an aerobic tank, and biological phosphorus removal is completed. However, the process needs to supplement alkalinity properly in the nitrification stage, and the denitrification and dephosphorization effects are closely related to the nitrifying liquid reflux ratio and the sludge reflux ratio, so that the energy consumption is correspondingly larger. In addition, the phosphorus release of the anaerobic tank and heterotrophic denitrification have competition of organic carbon sources, the lower concentration of organic matters in actual sewage is an important factor for restricting the heterotrophic denitrification effect, the additional organic carbon sources are needed, the operation cost is high and the operation is complex after long-term use, the sludge yield is excessive, and the strict emission standard is difficult to economically and effectively meet. When the water quality fluctuation is large, the water cannot be accurately fed, the excessive feeding is easy to cause waste, the water quality of the outlet water is influenced, and the denitrification cannot achieve the ideal effect when the feeding is insufficient. Therefore, the method aims at low consumption carbon reduction, economy and high efficiency of low C/N sewageThe development of biological denitrification and dephosphorization process becomes a research direction in the field of sewage treatment.
Compared with the heterotrophic denitrification technology, the sulfur autotrophic denitrification technology does not need to add an organic carbon source, and nitrate nitrogen in sewage is reduced into nitrite nitrogen and nitrogen in sequence by adding a reduced sulfur electron donor and an inorganic carbon source (also serving as an alkalinity source) under the anoxic condition. On one hand, the reduced sulfur and inorganic carbon sources are cheap and easy to obtain, and the biological toxicity is low, so that the running cost is low; on the other hand, the biomass yield of sulfur autotrophic denitrifying bacteria is low, which has advantages in minimizing excess sludge and reducing the cost of sludge treatment disposal. Therefore, sulfur autotrophic denitrification technology has long been considered as a promising new biological denitrification technology to overcome the limitations of conventional heterotrophic denitrification technology when treating low C/N wastewater.
Although sulfur autotrophic denitrification technology has been widely concerned, the application and development of the technology still face the restriction of consuming alkalinity, generating sulfate and other problems in the article of Simultaneous heterotrophic and sulfur-oxidizing autotrophic denitrification process for drinking water treatment: control of sulfate production. Because the sulfur autotrophic denitrification reaction is a continuous process of producing acid and sulfate, alkalinity is continuously consumed along with the progress of the reaction, and an extra alkalinity source is usually required to be added into the reaction system to maintain the higher denitrification efficiency of the sulfur autotrophic denitrification system. The common alkalinity source is sodium bicarbonate, which has better water solubility but poor economy, and low-cost and easily available limestone (CaCO) with good buffering performance 3 ) Siderite (FeCO) 3 ) The solid material is a good alkalinity slow-release source, and meanwhile, calcium ions can also generate precipitation with sulfate ions and phosphate ions, so that the purposes of reducing sulfur and removing phosphorus are achieved. Generally, as mentioned in the article of Pilot-scale application of sulfur-limestone autotrophic denitrification biofilter for municipal tailwater treatment: performance and microbial community structure, in the engineering application of sulfur autotrophic denitrification technology, sulfur-limestone autotrophic denitrification (SLAD) biological filter, the fixed bed biological filter is easy to be blocked, the filter materials need to be washed and replaced regularly, the filter materials are easy to be unevenly distributed, the process operation is complex, and the filler replacement and maintenance cost is high. Therefore, these factors limit the practical engineering application of sulfur autotrophic denitrification technology.
On the basis, the invention mainly aims at the traditional low C/N sewage A 2 The heterotrophic denitrification in the O denitrification and dephosphorization process needs to be added with the limitation of an organic carbon source, and the problems of alkalinity consumption, sulfate generation and the like faced by the sulfur autotrophic denitrification technology provide a method for treating low C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification (AOA-MBNR) process. The anaerobic tank, the aerobic tank, the anoxic tank and the sedimentation tank are sequentially connected, and the process mainly comprises anaerobic phosphorus release, aerobic excessive phosphorus absorption, ammonia nitrogen nitrification and anoxic autotrophic denitrification. Wherein, an alkalinity slow-release porous spherical shell suspended filler which can be used as an inorganic carbon source and an alkalinity slow-release source and can improve the problem of sulfate recovery in the sulfur autotrophic denitrification process is adopted in the sulfur autotrophic denitrification anoxic tank, thereby forming a moving bed form. The AOA-MBNR process has the advantages that the dephosphorization and denitrification unit is carried out, so that the competition of organic carbon sources is reduced; the biological dephosphorization effect is improved, and the dosage of a dephosphorization agent is reduced; the nitrifying liquid is not required to flow back, so that the energy consumption is effectively reduced; the recovery operation of the suspended filler is simple; sulfate in the effluent is reduced; autotrophic denitrification is adopted, and an external organic carbon source is not needed, so that the running cost is further reduced.
Disclosure of Invention
The invention provides a method for treating low-C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process, wherein an anaerobic tank, an aerobic tank, an anoxic tank and a sedimentation tank are sequentially connected to perform enrichment culture of phosphorus accumulating bacteria, nitrifying bacteria and sulfur autotrophic denitrification bacteria respectively. The process firstly realizes anaerobic phosphorus release without carbon source competition in an anaerobic tank, so that organic carbon sources in sewage are fully utilized by phosphorus accumulating bacteria, and polymeric phosphate in cells of the phosphorus accumulating bacteria is released. As no denitrification carbon source competition exists, the phosphorus accumulating bacteria can obtain better nutrition and growth conditions, and the phosphorus removing effect is improved. And then the effluent finishes excessive phosphorus absorption and ammonia nitrogen nitrification of phosphorus accumulating bacteria in an aerobic tank, finishes biological phosphorus removal by discharging phosphorus-rich sludge, and provides nitrate nutrients for a subsequent autotrophic nitrogen removal unit. Finally, adding an alkalinity slow-release porous spherical shell suspended filler which can be used as an inorganic carbon source and an alkalinity slow-release source into the sulfur autotrophic denitrification anoxic tank and can improve the problem of sulfate recovery in the sulfur autotrophic denitrification process, thereby forming a moving bed form. And then the sulfur autotrophic denitrifying bacteria uses reduced sulfur as an electron donor and nitrate as an electron acceptor, and reduces nitrate nitrogen into nitrogen under the condition of no need of externally adding an organic carbon source, so that the sewage autotrophic denitrification is completed. And the sludge in the sedimentation tank flows back to the anaerobic tank, so that the phosphorus accumulating bacteria biomass in the anaerobic tank is ensured. The invention can realize deep denitrification and dephosphorization of low-C/N sewage without adding an organic carbon source, and has the characteristics of low consumption, carbon reduction and the like.
The technical scheme of the invention is as follows:
a method for treating low C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process comprises the following steps:
an anaerobic-aerobic-anoxic process and a moving bed autotrophic denitrification process are coupled to construct an AOA-MBNR process; the anaerobic tank, the aerobic tank, the anoxic tank and the sedimentation tank are sequentially connected, and inoculated sludge is respectively added to perform enrichment culture of phosphorus accumulating bacteria, nitrifying bacteria and sulfur autotrophic denitrifying bacteria; firstly, anaerobic phosphorus release without carbon source competition is realized in an anaerobic tank, so that organic carbon sources in sewage are fully utilized by phosphorus accumulating bacteria, and the polyphosphate in cells of the phosphorus accumulating bacteria is released; the effluent completes the excessive phosphorus absorption of phosphorus accumulating bacteria and the ammonia nitrogen nitrification process of nitrifying bacteria in an aerobic tank, completes biological phosphorus removal by discharging phosphorus-rich sludge, and provides nitrate nutrients for a subsequent autotrophic nitrogen removal unit; then the effluent completes the sulfur autotrophic denitrification in an anoxic tank, namely the sulfur autotrophic denitrification bacteria adopts the externally added reduced sulfur as an electron donor, nitrate in the effluent of the aerobic tank is used as an electron acceptor, and under the condition of no need of externally adding an organic carbon source, only inorganic carbon source is utilized, and finally the nitrate is reduced into nitrogen; wherein, an alkalinity slow-release porous spherical shell suspended filler which can be used as an inorganic carbon source and an alkalinity slow-release source and can improve the problem of sulfate recovery in the sulfur autotrophic denitrification process is adopted in the anoxic tank, thereby forming a moving bed mode; finally, the sludge in the sedimentation tank flows back to the anaerobic tank, so that the phosphorus accumulating bacteria biomass in the anaerobic tank is ensured.
The outside of the alkalinity slow-release porous spherical shell suspension filler is a porous spherical shell, and polyurethane sponge, polyethylene pearl cotton, limestone and siderite are filled in the porous spherical shell, wherein the mass ratio of the polyurethane sponge to the polyethylene pearl cotton to the limestone to the siderite is 0.1:0.1:0.578-2.21:1.
The polyurethane sponge is cut into 5-10 cm 3 Cutting the blocks of the polyethylene resin pearl cotton into 5-10 cm 3 Is a block of (a) a block of (b).
The mass ratio of the limestone to the siderite is 1.73:1.
The invention has the beneficial effects that: the invention provides a method for treating low-C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic nitrogen removal (AOA-MBNR) process, which mainly comprises anaerobic phosphorus release, aerobic excessive phosphorus absorption, ammonia nitrogen nitrification and anoxic autotrophic denitrification, wherein an alkalinity slow-release porous spherical shell suspension filler which can be used as an inorganic carbon source and an alkalinity slow-release source and can improve the sulfate recovery problem in the sulfur autotrophic nitrogen removal process is adopted in a sulfur autotrophic denitrification anoxic tank. The AOA-MBNR process has the advantages that the dephosphorization and denitrification unit is carried out, so that the competition of organic carbon sources is reduced; the biological dephosphorization effect is improved, and the dosage of a dephosphorization agent is reduced; the nitrifying liquid is not required to flow back, so that the energy consumption is effectively reduced; the recovery operation of the suspended filler is simple; sulfate in the effluent is reduced; autotrophic denitrification is adopted, and an external organic carbon source is not needed, so that the running cost is further reduced.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the technical proposal.
Example 1
The actual low C/N sewage of a sewage treatment plant is taken as a treatment object to carry out denitrification and dephosphorization treatment, and the specific water quality and water quantity of inflow water during the operation period are as follows: cod=150 mg/L, C TN ＝50mg/L，C Ammonia nitrogen ＝40mg/L，C TP ＝3.5mg/L，pH＝7.4，Q＝1000m 3 And/d. The anaerobic tank, the aerobic tank, the anoxic tank and the sedimentation tank are sequentially connected, and the effective volume of each tank is 250m 3 ，MLSS＝4000mg/L，HRT＝6h，SRT＝20d，The sludge reflux amount is 100%, and the dissolved oxygen in the aerobic tank is controlled to be 1-2 mg/L. The method comprises the steps of adding a reduced sulfur electron donor and an alkalinity slow-release porous spherical shell suspension filler into an anoxic pond, wherein polyurethane sponge, polyethylene pearl cotton, limestone and siderite are filled in the filler, the mass of the polyurethane sponge, the mass of the polyethylene pearl cotton, the mass of the limestone and the mass of the siderite are respectively 0.6g, 10.38g and 6g, the polyurethane sponge is cut into a cube shape with the size of 20mm by 20mm, and the polyethylene pearl cotton is cut into a cylinder shape with the diameter of 20mm and the height of 30 mm. The anaerobic-aerobic-anoxic-moving bed autotrophic nitrogen removal (AOA-MBNR) process runs continuously and stably, the water quality of the effluent can meet the requirement of the first-level A standard in the pollutant emission standard of urban sewage treatment plants, the pH value is always kept at about 7.5, COD in the effluent is lower than 50mg/L, the total nitrogen removal rate is as high as more than 95%, the sulfate content is greatly reduced, and the dephosphorization effect is realized.
Comparative example 1
An anaerobic tank and an aerobic tank are not arranged at the front end of the anoxic tank, and the rest is the same as in the embodiment 1.
In the scheme, compared with the embodiment 1, namely under the condition that the front end of the anoxic tank is not provided with the anaerobic tank and the aerobic tank, the effluent quality through the independent moving bed sulfur autotrophic denitrification process cannot meet the requirement of the first grade A standard in the pollutant emission standard of urban sewage treatment plants. As the total nitrogen in the inflow water is mainly ammonia nitrogen, and the sulfur autotrophic anoxic tank can only reduce nitrate nitrogen into nitrogen, the total nitrogen removal effect is very limited, and even the denitrification and dephosphorization functions can not be realized, which shows that the AOA-MBNR process has better treatment effect than the independent moving bed sulfur autotrophic denitrification process.
Comparative example 2
The anoxic tank is not added with alkali sustained-release porous spherical shell suspended filler, and the rest is the same as in the embodiment 1.
In the scheme, compared with the embodiment 1, namely under the condition that the alkaline slow-release porous spherical shell suspension filler is not added, a moving bed form cannot be formed in the anoxic pond, namely, the alkalinity slow-release effect is not achieved, the pH value in the effluent is reduced to 5.9, the COD is lower than 50mg/L, the total nitrogen removal rate is obviously reduced, the nitrate nitrogen in the effluent is increased, the sulfate content is increased, and the TP is lower than 1mg/L. Because the alkaline slow-release porous spherical shell suspended filler is not added in the anoxic tank, no alkalinity slow-release effect exists, the sulfur autotrophic denitrification reaction is a continuous process of producing acid and sulfate, the alkalinity can be continuously consumed along with the progress of the reaction, the effect of sulfur autotrophic denitrification can be obviously affected due to the too low pH value, the phenomena of obviously reducing the total nitrogen removal rate and increasing nitrate nitrogen in the effluent appear, and meanwhile, the removal effect of sulfate is also obviously reduced, so that the influence of the alkalinity slow-release effect of the porous spherical shell suspended filler on the effect of sulfur autotrophic denitrification and the removal effect of sulfate is obvious.
Comparative example 3
Sodium acetate is added into the anoxic tank as an organic carbon source, a reduced sulfur electron donor is not added, and the rest is the same as in the embodiment 1.
In the scheme, compared with the embodiment 1, namely under the condition that sodium acetate is added as an organic carbon source and a reduced sulfur electron donor is not added, the heterotrophic denitrification process can be carried out in the anoxic tank, the pH value in the effluent is slightly alkaline, COD is unstable, the total nitrogen removal rate is more than 95%, TP is lower than 1mg/L, and the denitrification and dephosphorization effects are good. However, the additional addition of sodium acetate as an organic carbon source has high running cost, complex operation and excessive sludge yield after long-term use. When the water quality fluctuation is large, the water cannot be accurately fed, the excessive feeding is easy to cause waste and influence the water quality of the discharged water, the denitrification cannot achieve the ideal effect when the feeding is insufficient, and the strict emission standard is difficult to economically and effectively meet. Therefore, the low-consumption carbon reduction, economical and efficient moving bed sulfur autotrophic nitrogen removal process is superior to the heterotrophic denitrification process in the anoxic tank aiming at nitrogen and phosphorus removal treatment of low-C/N sewage.
Claims (1)
1. A method for treating low C/N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process is characterized by comprising the following steps:
an anaerobic-aerobic-anoxic process and a moving bed autotrophic denitrification process are coupled to construct an AOA-MBNR process; the anaerobic tank, the aerobic tank, the anoxic tank and the sedimentation tank are sequentially connected, inoculated sludge is respectively added, and enrichment culture of phosphorus accumulating bacteria, nitrifying bacteria and sulfur autotrophic denitrifying bacteria is respectively carried out in the anaerobic tank, the aerobic tank and the anoxic tank; in the AOA-MBNR process, anaerobic phosphorus release without carbon source competition is realized in an anaerobic tank, so that organic carbon sources in sewage are fully utilized by phosphorus accumulating bacteria, and the polyphosphate in the cell body is released; the effluent of the anaerobic tank completes the excessive phosphorus absorption of phosphorus accumulating bacteria and the ammonia nitrogen nitrification process of nitrifying bacteria in the aerobic tank, completes biological phosphorus removal by discharging phosphorus-rich sludge, and provides nitrate nutrients for the autotrophic denitrification process of the subsequent anoxic tank; then the effluent completes the sulfur autotrophic denitrification in an anoxic tank, namely the sulfur autotrophic denitrification bacteria adopts the externally added reduced sulfur as an electron donor, nitrate in the effluent of the aerobic tank is used as an electron acceptor, and under the condition of no need of externally adding an organic carbon source, only inorganic carbon source is utilized, and finally the nitrate is reduced into nitrogen; wherein, an alkalinity slow-release porous spherical shell suspended filler which can be used as an inorganic carbon source and an alkalinity slow-release source and can improve the sulfate recovery problem in the sulfur autotrophic denitrification process is adopted in the anoxic tank, thereby forming a moving bed mode; finally, the sludge in the sedimentation tank flows back to the anaerobic tank, so that the biomass of phosphorus accumulating bacteria in the anaerobic tank is ensured; wherein,,
the outside of the alkalinity slow-release porous spherical shell suspension filler is a porous spherical shell, and polyurethane sponge, polyethylene pearl cotton, limestone and siderite are filled in the porous spherical shell, wherein the mass ratio of the polyurethane sponge to the polyethylene pearl cotton to the limestone to the siderite is 0.1:0.1:0.578-2.21:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111259.8A CN114524513B (en) | 2022-01-28 | 2022-01-28 | Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111259.8A CN114524513B (en) | 2022-01-28 | 2022-01-28 | Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114524513A CN114524513A (en) | 2022-05-24 |
| CN114524513B true CN114524513B (en) | 2023-05-23 |
Family
ID=81623069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210111259.8A Active CN114524513B (en) | 2022-01-28 | 2022-01-28 | Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114524513B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115583723A (en) * | 2022-08-02 | 2023-01-10 | 河南工业大学 | Sewage treatment method and device for removing nitrate in water by utilizing enhanced sulfur autotrophy |
| CN115259351A (en) * | 2022-09-29 | 2022-11-01 | 山东国一中永环保技术服务有限公司 | Nano ceramic-micro-oxysulfide-coupled double-membrane-tower sewage treatment system |
| CN115636507B (en) * | 2022-11-23 | 2023-08-11 | 山东建筑大学 | Constructed wetland slow release filler based on sulfur autotrophic denitrification |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923757A (en) * | 2016-05-11 | 2016-09-07 | 深圳市瑞清环保科技有限公司 | Method for phosphorus removal and denitrification through iron elementary substance cooperating with sulfur autotrophic denitrification |
| CN109879415B (en) * | 2017-05-24 | 2021-03-16 | 中国科学院生态环境研究中心 | Slow-release electron donor and method for deep denitrification of sewage by using same |
| CN110615531B (en) * | 2019-09-16 | 2021-11-26 | 北京工业大学 | DEAMOX sludge double-reflux AOAO sewage-based deep nitrogen and phosphorus removal device and method |
| CN111777179B (en) * | 2020-06-29 | 2022-03-29 | 北京工业大学 | A/O coupling sulfur autotrophic denitrification enhanced low-carbon-nitrogen-ratio sewage nitrogen and phosphorus removal device and method |
-
2022
- 2022-01-28 CN CN202210111259.8A patent/CN114524513B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114524513A (en) | 2022-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114524513B (en) | Method for treating low-C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic denitrification process | |
| US9884779B2 (en) | Biological wastewater treatment and reuse utilizing sulfur compounds as electron carrier to minimize sludge production | |
| CN101985376B (en) | Method for removing carbon and nitrogen pollutants in waste water in one step | |
| CN106745743B (en) | Sewage nitrogen and phosphorus removal system | |
| CN106542655B (en) | Rapid biofilm formation method for efficient denitrification microbial agent | |
| CN103121754B (en) | A kind of denitrification dephosphorization technique | |
| CN101538104B (en) | Improved A2N denitrifying dephosphatation and deep denitrification device and method | |
| CN112897696B (en) | Device and method for biological nitrogen and phosphorus removal based on staged water inflow | |
| CN109896628B (en) | Device and method for deep denitrification by AOA (PD-ANAMMOX) biomembrane technology | |
| CN209226777U (en) | A kind of reinforcing advanced nitrogen dephosphorization process sewage-treatment plant | |
| CN112125396A (en) | Anaerobic ammonia oxidation enhanced municipal sewage nitrogen and phosphorus removal system and method | |
| CN111422976A (en) | Process for treating high ammonia nitrogen wastewater by using moving bed biofilm reactor | |
| CN112678955A (en) | AO-inverted A2Enhanced denitrification sewage treatment system for/O coupling artificial wetland | |
| CN109231462A (en) | Improved continuous flow double sludge denitrification sewage deep denitrification and dephosphorization method and device | |
| CN102503035A (en) | Biological phosphorus accumulating and phosphorus recycling method for treating phosphorus-containing liquid waste | |
| CN109502748A (en) | Based on nitrosation-anaerobic ammoxidation-induction crystallization phosphorus recycling sewage disposal system and method | |
| CN114524511B (en) | Alkalinity slow-release porous spherical shell suspension filler based on low-C/N sewage sulfur autotrophic denitrification | |
| CN113023890A (en) | Anoxic/aerobic alternate operation reinforced autotrophic nitrogen removal sewage treatment method and device | |
| CN110921824B (en) | Culture method for denitrification capacity of anaerobic ammonia oxidation sludge | |
| Biplob et al. | Nitrogen-removal efficiency in an upflow partially packed biological aerated filter (BAF) without backwashing process | |
| Chang et al. | Improvment of nitrogen and phosphorus removal in the anaerobic-oxic-anoxic-OXIC (AOAO) process by stepwise feeding | |
| CN214611770U (en) | AO-inverted A2Enhanced denitrification sewage treatment system for/O coupling artificial wetland | |
| CN115367879A (en) | Method for realizing deep denitrification of municipal sewage by anaerobic ammonia oxidation driven carrier biofilm/suspended sludge system | |
| CN201538728U (en) | Improved A2N denitrifying dephosphatation and deep denitrification device | |
| CN212713137U (en) | System for sewage treatment plant upgrading and transformation under limited capacity of biological denitrification tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |