CN117585814A - System regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestion liquid - Google Patents
System regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestion liquid Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 122
- 239000010865 sewage Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000029087 digestion Effects 0.000 title claims abstract description 40
- 230000033228 biological regulation Effects 0.000 title claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 title claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000004062 sedimentation Methods 0.000 claims abstract description 57
- 238000000855 fermentation Methods 0.000 claims abstract description 32
- 230000004151 fermentation Effects 0.000 claims abstract description 32
- 239000006228 supernatant Substances 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims description 35
- 230000001546 nitrifying effect Effects 0.000 claims description 27
- 238000010992 reflux Methods 0.000 claims description 19
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 30
- 230000008569 process Effects 0.000 abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 15
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000001079 digestive effect Effects 0.000 abstract description 6
- 235000011389 fruit/vegetable juice Nutrition 0.000 abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 40
- 229910021529 ammonia Inorganic materials 0.000 description 21
- 238000007254 oxidation reaction Methods 0.000 description 19
- 229910052799 carbon Inorganic materials 0.000 description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 17
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 241000894006 Bacteria Species 0.000 description 10
- 230000001651 autotrophic effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000005273 aeration Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 241001453382 Nitrosomonadales Species 0.000 description 2
- 208000037534 Progressive hemifacial atrophy Diseases 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012017 passive hemagglutination assay Methods 0.000 description 2
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
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- 239000000149 chemical water pollutant Substances 0.000 description 1
- 238000005112 continuous flow technique Methods 0.000 description 1
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- 235000014113 dietary fatty acids Nutrition 0.000 description 1
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- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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Classifications
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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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- 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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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
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Abstract
The invention discloses a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestive juice, which relates to the technical field of sewage treatment and comprises the following steps: the main flow area is provided with a first water outlet pipe and a secondary sedimentation tank, and the water outlet end of the secondary sedimentation tank is connected with the first water outlet pipe; the sludge treatment area comprises a sludge fermentation tank and a sludge anaerobic digestion tank, and the bottom of the secondary sedimentation tank is respectively connected with the sludge fermentation tank and the sludge anaerobic digestion tank; the side flow area is connected with the supernatant outlets of the sludge fermentation tank and the sludge anaerobic digestion tank, is also connected with the first water outlet pipe, and is connected with the main flow area through a water return pipe; the problem that nitrite nitrogen is difficult to stably obtain in the anaerobic ammoxidation process is effectively solved, and compared with the traditional nitrification and denitrification process, the total nitrogen concentration of effluent is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and in particular relates to a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestion liquid.
Background
The standard discharge of urban sewage plants is a focus of attention in recent years, and particularly the standard discharge control of total nitrogen in effluent is increasingly strict. Most of the wastewater collected to municipal sewage treatment plants has relatively low carbon-nitrogen ratio, and the denitrification efficiency of the traditional nitrification and denitrification process is limited. In order to meet the increasingly strict emission requirements, the mode of adding a carbon source is widely used for enhancing denitrification, but the cost of adding the carbon source is quite high and a post-guarantee unit needs to be added to remove residual organic matters. On the other hand, a large amount of aeration is required for complete nitrification, and a high proportion of operation energy consumption for the operation of the whole sewage treatment plant is occupied. Therefore, the search for new technology and new technology of low-consumption, high-efficiency and stable denitrification is an urgent need for the water treatment industry.
The discovery of anaerobic ammoxidation process makes the sewage biological denitrification approach more diversified. The method opens up a new way for energy sources of urban sewage treatment plants to self-supply or receive energy sources from external sources, and has wide technical application prospect. At present, conventional biological denitrification processes in sewage treatment plants still rely mainly on activated sludge systems by nitrification/denitrification, which require a large amount of additional carbon source and aeration energy. Anaerobic ammonia oxidation technology may become one of the mainstream methods of wastewater treatment in the near future due to its special advantages of reducing aeration energy and carbon source addition. Currently, more than hundred projects worldwide are using anaerobic ammonia oxidation technology to treat high ammonia wastewater, including sludge digestion supernatants, landfill leachate, and aquaculture wastewater. In the last decade, the application research of the anaerobic ammonia oxidation technology in the aspect of treating low-ammonia wastewater is increasing, and the great application potential of the technology in urban sewage treatment is highlighted.
At present, the research of short-cut denitrification coupling anaerobic ammonia oxidation technology is actively progressed, the principle of the anaerobic ammonia oxidation technology driven by short-cut denitrification of main stream sewage is verified in engineering, and the application of partial anaerobic ammonia oxidation in urban sewage treatment is substantially promoted. The anaerobic ammonia oxidation reaction and the denitrification reaction are carried out simultaneously in a single reactor, and the electron donor of the anaerobic ammonia oxidation reaction comes from nitrite nitrogen generated in the denitrification process, so that the bottleneck problem that nitrite oxidizing bacteria are difficult to control in the urban sewage treatment process by the short-cut nitrification/anaerobic ammonia oxidation process is solved, the problem that nitrite nitrogen is difficult to obtain stably in the anaerobic ammonia oxidation process is solved effectively, and compared with the traditional nitrification and denitrification process, the total nitrogen concentration of effluent is obviously reduced, and the method has practical research significance and engineering application prospect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestive juice, which effectively solves the problem that nitrite nitrogen is difficult to stably obtain in the anaerobic ammoxidation process, and compared with the traditional nitrification and denitrification process, the total nitrogen concentration of effluent is obviously reduced.
In order to achieve the above purpose, the invention provides a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestive juice, the system comprises:
the main flow area is provided with a first water outlet pipe and a secondary sedimentation tank, and the water outlet end of the secondary sedimentation tank is connected with the first water outlet pipe;
the sludge treatment area comprises a sludge fermentation tank and a sludge anaerobic digestion tank, and the bottom of the secondary sedimentation tank is respectively connected with the sludge fermentation tank and the sludge anaerobic digestion tank;
the side flow area is connected with the supernatant outlets of the sludge fermentation tank and the sludge anaerobic digestion tank, and is also connected with the first water outlet pipe, and the side flow area is connected with the main flow area through a water return pipe.
Optionally, the main flow area comprises a primary sedimentation tank, an anaerobic area, an anoxic area and an aerobic area, the bottom of the secondary sedimentation tank is connected with the anaerobic area through a sludge return pipe, and the tail end of the aerobic area is connected with the anoxic area through a nitrifying liquid return pipe.
Optionally, the lateral flow zone comprises a lateral flow pure biological membrane treatment system, wherein a carrier biological membrane is arranged in the lateral flow pure biological membrane treatment system, and the filling ratio of the carrier biological membrane is less than 66.7%.
Optionally, the reflux ratio of the sludge reflux pipe is 50% -100%, the reflux ratio of the nitrifying liquid reflux pipe is 75% -200%, the total hydraulic retention time of the main flow area is 8-17h, the hydraulic retention time of the aerobic area is 5-9h, and the dissolved oxygen at the tail end of the aerobic area is 1-3mg/L.
Optionally, the system regulation method comprises:
the sewage treated by the primary sedimentation tank enters an anaerobic zone through a second water outlet pipe, the ammonia nitrogen concentration of the inlet water is 20-75mg/L, the carbon nitrogen ratio is 1.5-6, and part of sludge at the bottom of the secondary sedimentation tank is introduced into the anaerobic zone through the sludge return pipe;
the sewage treated in the anaerobic zone enters the anoxic zone, the aerobic zone discharges nitrifying liquid into the anoxic zone through a nitrifying liquid return pipe, and the concentration of nitrate nitrogen in the nitrifying liquid is 5-14mg/L;
the sewage treated by the anoxic zone enters the aerobic zone to perform aerobic reaction;
the sewage treated in the aerobic zone enters the secondary sedimentation tank for mud-water separation, a part of water at the water outlet end of the secondary sedimentation tank enters the side-stream pure biological membrane treatment system, and the other part of water is directly discharged or enters the subsequent advanced treatment;
the other part of sludge at the bottom of the secondary sedimentation tank enters the sludge fermentation tank and the sludge anaerobic digestion tank through a discharge pipe, supernatant in the sludge fermentation tank and the sludge anaerobic digestion tank is discharged into the side-stream pure biological membrane treatment system, and the side-stream pure biological membrane treatment system also introduces water in a first water outlet pipe into a part through a water outlet pipe branch pipe.
The invention provides a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestive juice, which has the beneficial effects that:
1. remarkably saving aeration quantity, and converting 1gNH4 by using nitrification and denitrification process based on activated sludge process in traditional municipal sewage treatment plant + - N theoretically consumes 4.57gO 2 The side flow treatment of the system can finish partial anaerobic ammonia oxidation autotrophic denitrification, so that a certain proportion of ammonia nitrogen is not required to be converted into nitrate nitrogen through the process aeration of a main flow area, and the theoretical consumption is 2.29-4.57gO 2 The aeration energy consumption of the sewage treatment plant can be effectively reduced;
2. the carbon source adding amount is saved, and 1gNO is removed by the traditional nitrification and denitrification process 3 - N theoretically should provide 2.86gCOD, and the side stream treatment process of the system realizes partial anaerobic ammoxidation autotrophic denitrification, so that a certain proportion of nitrate nitrogen can be converted into nitrogen without carbon source, and simultaneously the nitrate nitrogen is converted into nitrogen without carbon source in the reduction process, and the corresponding carbon source saved can be further used for removing total nitrogen in the main stream area, so that the system removes 1gNH4 + - N can theoretically provide lower carbon source quantity, when the organic matters in raw water are less, compared with the traditional nitrification and denitrification process, the carbon source adding quantity is remarkably saved, if the organic matters in raw water reach a certain range, even no carbon source is needed to be added, meanwhile, part of sludge provides an internal carbon source through fermentation, and the carbon source can be fully utilized;
3. the excess sludge yield is low, the system reaction process is partial autotrophic denitrification, the sludge yield is effectively reduced, and the sludge disposal cost is reduced. Meanwhile, part of the surplus sludge is utilized by fermentation, and the other part of the surplus sludge is subjected to anaerobic digestion to realize energy recovery, so that the whole sludge realizes the diversified utilization of a self system, the surplus sludge amount is effectively reduced, and the double-carbon target is realized;
4. autotrophic denitrification in the lateral flow region is strong in robustness, the system combines a partial anaerobic ammonia oxidation process based on short-cut denitrification coupling of the lateral flow, the biological film effectively maintains anaerobic ammonia oxidation bacteria, the shock resistance is good, the lateral flow region has the advantage of higher temperature, and the process is strong in robustness;
5. the autotrophic nitrogen removal contribution of the main flow area of the system is improved, the anaerobic ammonia oxidation nitrogen removal can be efficiently realized in the side flow area, the biological film can continuously fall off in the metabolic process, the proportion of the autotrophic nitrogen removal can be enhanced after the falling biological film enters the main flow area, and the autotrophic nitrogen removal capacity of the main flow area is improved;
6. the method has the advantages of saving the occupied area, along with strong engineering applicability, simple upgrading and reconstruction in the built water plant, easy implementation of system management operation and easy popularization and application.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 shows a schematic diagram of a system for simultaneous denitrification and dephosphorization of side-stream pure biofilm PD/A enhanced municipal sewage and sludge digestion solution in accordance with an embodiment of the invention.
Reference numerals illustrate:
1. a primary sedimentation tank; 2. a second water outlet pipe; 3. an anaerobic zone; 4. an anoxic zone; 5. an aerobic zone; 6. a secondary sedimentation tank; 7. a nitrifying liquid return pipe; 8. a sludge return pipe; 9. a first water outlet pipe; 10. a discharge pipe; 11. a sludge fermentation tank; 12. a sludge anaerobic digestion tank; 13. a water outlet pipe branch pipe; 14. a side stream pure biofilm treatment system; 15. a carrier biofilm; 16. the side stream zone passes through a return line.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestive juice, which comprises the following steps:
the main flow area is provided with a first water outlet pipe and a secondary sedimentation tank, and the water outlet end of the secondary sedimentation tank is connected with the first water outlet pipe;
the sludge treatment area comprises a sludge fermentation tank and a sludge anaerobic digestion tank, and the bottom of the secondary sedimentation tank is respectively connected with the sludge fermentation tank and the sludge anaerobic digestion tank;
and the side flow area is connected with the supernatant outlets of the sludge fermentation tank and the sludge anaerobic digestion tank, is also connected with a first water outlet pipe, and is connected with the main flow area through a water return pipe.
Specifically, the system regulation and control method is that sewage is treated through a main flow area, part of sludge at the bottom of a secondary sedimentation tank is sent to a sludge fermentation tank and a sludge anaerobic digestion tank in a sludge treatment area, supernatant liquid generated by the sludge fermentation tank and the sludge anaerobic digestion tank enters a side flow area and is converged with part of effluent in a first water outlet pipe into a side flow pure biological membrane treatment system, a reaction matrix is provided for short-range denitrification coupling anaerobic ammonia oxidation, and effluent of the side flow pure biological membrane treatment system is sent back to the anaerobic area again.
Optionally, the main flow area comprises a primary sedimentation tank, an anaerobic area, an anoxic area and an aerobic area, the bottom of the secondary sedimentation tank is connected with the anaerobic area through a sludge return pipe, and the tail end of the aerobic area is connected with the anoxic area through a nitrifying liquid return pipe.
Specifically, a primary sedimentation tank, an anaerobic zone, an anoxic zone, an aerobic zone and a secondary sedimentation tank are sequentially arranged in a main flow zone, sewage entering the primary sedimentation tank needs to be treated through several or all structures in an inlet well, an adjusting tank, an outlet grid, a fine grid and a sand basin in sequence, wherein the anaerobic zone is provided with a sewage discharge after the primary sedimentation tank treatment, residual sludge at the bottom of the secondary sedimentation tank is returned to the anaerobic zone through a sludge return pipe, and effluent of a side-flow pure biological membrane treatment system is returned to the anaerobic zone to perform anaerobic phosphorus release reaction in the anaerobic zone; the anaerobic zone is provided with an anaerobic zone, and the sewage treated by the anaerobic zone is discharged into the anoxic zone; the aerobic zone and the secondary sedimentation tank only flow in sewage treated by the previous working procedure.
In one embodiment, the main flow region may also be configured to resemble or modify a plug flow process, such as an A/O, multi-stage A/O, AOA, UCT process, or the like.
Optionally, the lateral flow zone comprises a lateral flow pure biological membrane treatment system, and a carrier biological membrane is arranged in the lateral flow pure biological membrane treatment system, and the filling ratio of the carrier biological membrane is less than 66.7%.
Specifically, a carrier easy to form a biological film is required to be arranged in the side-stream pure biological film treatment system, so that an anoxic microenvironment is provided for denitrification functional microorganisms, and the synergistic growth of denitrifying bacteria and anaerobic ammonia oxidizing bacteria is facilitated; the biofilm filling ratio of the side-stream pure biofilm treatment system is less than 66.7%, and the carrier can be an anaerobic ammonia oxidation carrier which is already cultured, a denitrification carrier which is already cultured, or a blank filler carrier in an easy fluidization mode.
Optionally, the reflux ratio of the sludge reflux pipe is 50% -100%, the reflux ratio of the nitrifying liquid reflux pipe is 75% -200%, the total hydraulic retention time of the main flow area is 8-17h, the hydraulic retention time of the aerobic area is 5-9h, and the dissolved oxygen at the tail end of the aerobic area is 1-3mg/L.
Optionally, the system regulation method comprises:
the sewage treated by the primary sedimentation tank enters an anaerobic zone through a second water outlet pipe, the ammonia nitrogen concentration of the inlet water is 20-75mg/L, the carbon nitrogen ratio is 1.5-6, and the anaerobic zone also introduces a part of sludge at the bottom of the secondary sedimentation tank through a sludge return pipe;
the sewage treated in the anaerobic zone enters an anoxic zone, and the aerobic zone discharges nitrifying liquid into the anoxic zone through a nitrifying liquid return pipe, wherein the concentration of nitrate nitrogen in the nitrifying liquid is 5-14mg/L;
the sewage treated by the anoxic zone enters an aerobic zone for aerobic reaction;
the sewage treated in the aerobic zone enters a secondary sedimentation tank for mud-water separation, a part of water at the water outlet end of the secondary sedimentation tank enters a side flow pure biological membrane treatment system, and the other part of water is directly discharged or enters subsequent advanced treatment;
the other part of sludge at the bottom of the secondary sedimentation tank enters the sludge fermentation tank and the sludge anaerobic digestion tank through a discharge pipe, supernatant fluid in the sludge fermentation tank and the sludge anaerobic digestion tank is discharged into a side-stream pure biological membrane treatment system, and the side-stream pure biological membrane treatment system also introduces water in a first water outlet pipe into a part through a water outlet pipe branch pipe.
Specifically, the sewage entering the main flow area flows out from the second water outlet pipe and then is subjected to continuous flow A 2 According to the/O process, the bottom sludge entering the front end of the anaerobic zone is returned except for the secondary sedimentation tank, all effluent in the side-stream pure biological membrane treatment system is returned to the front end of the anaerobic zone, a part of biological membranes naturally fall off along with growth and enrichment in the side-stream pure biological membrane treatment system, and anaerobic ammonia oxidizing bacteria contained in the fallen biological membranes can be supplemented into the main flow process, so that autotrophic nitrogen removal in the main flow zone is enhanced, and the treatment of sewage with low carbon nitrogen ratio is facilitated: the phosphorus accumulating bacteria synthesizes internal carbon source PHAs by utilizing volatile fatty acid VFAs in raw water to reduce the C/N ratio and release phosphorus to the outside of cells; the nitrogen nitrate can also be used for heterotrophic denitrification by utilizing a carbon source in raw water, namely, the process of reducing the nitrogen nitrate to nitrogen. The sewage treated in the anaerobic zone enters the anoxic zone, and the nitrifying liquid is discharged from a nitrifying liquid backflow pipe, wherein the nitrifying liquid backflow ratio is controlled to be 75% -200%, the nitrifying liquid also contains nitrate nitrogen, the concentration of the nitrate nitrogen is 5-15mg/L, and the nitrate nitrogen in the anoxic zone utilizes a carbon source in the sewage to carry out heterotrophic denitrification and denitrification, so that the process of reducing the nitrate nitrogen to nitrogen is realized. In the aerobic zone, only sewage treated in the anoxic zone enters for aerobic reaction, on one hand, phosphorus accumulating bacteria takes oxygen as an electron acceptor and PHAs as an electron donor, aerobic phosphorus absorption is carried out for removing, the phosphorus concentration of the effluent is below 0.5mg/L, and the phosphorus concentration is equal to the carbon-nitrogen ratioWhen the concentration of phosphorus is too low, the concentration of phosphorus is controlled below 0.8mg/L, and the phosphorus is removed by chemical phosphorus removal; residual organic matters can be removed by aeration, and the COD concentration of the effluent is lower than 50mg/L; on the other hand, the full nitration reaction is carried out, the nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen under the aerobic condition, and the ammonia nitrogen concentration in the effluent is lower than 1.0mg/L. And sewage treated in the aerobic zone only enters the secondary sedimentation tank, mud-water separation is carried out in the secondary sedimentation tank, a part of sludge precipitated to the bottom is returned to the anaerobic zone through a sludge return pipe, the reflux ratio is controlled to be 50% -100%, the other part of sewage is respectively sent to the sludge fermentation tank and the sludge anaerobic digestion tank through a discharge pipe, a part of effluent generated after precipitation in the secondary sedimentation tank enters the subsequent advanced treatment or is directly discharged, and the other part of effluent directly enters the side-stream pure biological membrane treatment system. The sludge fermentation tank and the sludge anaerobic digestion tank are discharged from the bottom of the secondary sedimentation tank, and the two tanks are treated to generate supernatant liquid which is collected into a side-stream pure biological membrane treatment system. The side-stream pure biological membrane treatment system is a continuous flow process, and the nitrate nitrogen is subjected to heterotrophic denitrification by utilizing a carbon source of anaerobic sludge fermentation, namely, the process of reducing the nitrate nitrogen into nitrogen; meanwhile, short-range denitrification occurs under the environment with low C/N ratio to generate nitrite nitrogen, and anaerobic ammonia oxidation bacteria on a carrier in the lateral flow pure biological membrane treatment system utilize ammonia nitrogen and nitrite nitrogen to perform anaerobic ammonia oxidation denitrification.
Examples
As shown in FIG. 1, the invention provides a system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestive juice, which comprises the following steps:
the main flow area is provided with a first water outlet pipe 9 and a secondary sedimentation tank 6, and the water outlet end of the secondary sedimentation tank 6 is connected with the first water outlet pipe 9;
the sludge treatment area comprises a sludge fermentation tank 11 and a sludge anaerobic digestion tank 12, and the bottom of the secondary sedimentation tank 5 is respectively connected with the sludge fermentation tank 11 and the sludge anaerobic digestion tank 12;
the side flow area is connected with the supernatant outlets of the sludge fermentation tank 11 and the sludge anaerobic digestion tank 12, is also connected with the first water outlet pipe 9, and is connected with the main flow area through a water return pipe 16.
In the embodiment, the main flow area comprises a primary sedimentation tank 1, an anaerobic area 3, an anoxic area 4 and an aerobic area 5, the bottom of the secondary sedimentation tank 6 is connected with the anaerobic area 3 through a sludge return pipe 8, and the tail end of the aerobic area 5 is connected with the anoxic area 4 through a nitrifying liquid return pipe 7.
In this embodiment, the lateral flow zone comprises a lateral flow pure biological membrane treatment system 14, and a carrier biological membrane 15 is arranged in the lateral flow pure biological membrane treatment system 14, and the filling ratio of the carrier biological membrane 15 is less than 66.7%.
In the embodiment, the reflux ratio of the sludge reflux pipe 8 is 50-100%, the reflux ratio of the nitrifying liquid reflux pipe 7 is 75-200%, the total hydraulic retention time of the main flow area is 8-17h, the hydraulic retention time of the aerobic area is 5-9h, and the dissolved oxygen at the tail end of the aerobic area is 1-3mg/L.
In this embodiment, the system regulation method includes:
the sewage treated by the primary sedimentation tank 1 enters an anaerobic zone 3 through a second water outlet pipe 2, the ammonia nitrogen concentration of the inlet water is 20-75mg/L, the carbon nitrogen ratio is 1.5-6, and the anaerobic zone 3 also introduces a part of sludge at the bottom of the secondary sedimentation tank 6 through a sludge return pipe 8;
the sewage treated in the anaerobic zone 3 enters the anoxic zone 4, the aerobic zone 5 discharges nitrifying liquid into the anoxic zone 4 through a nitrifying liquid return pipe 7, and the concentration of nitrate nitrogen in the nitrifying liquid is 5-14mg/L;
the sewage treated in the anoxic zone 4 enters an aerobic zone 5 for aerobic reaction;
the sewage treated in the aerobic zone 5 enters a secondary sedimentation tank 6 for mud-water separation, a part of water at the water outlet end of the secondary sedimentation tank 6 enters a side flow pure biological membrane treatment system 14, and the other part of water is directly discharged or enters subsequent advanced treatment;
another part of sludge at the bottom of the secondary sedimentation tank 6 enters a sludge fermentation tank 11 and a sludge anaerobic digestion tank 12 through a discharge pipe 10, supernatant liquid in the sludge fermentation tank 11 and the sludge anaerobic digestion tank 12 is discharged into a side-stream pure biological film treatment system 14, and the side-stream pure biological film treatment system 14 also introduces a part of water in the first water outlet pipe 9 through a water outlet pipe branch pipe 13.
In conclusion, the system is started, activated sludge of a traditional sewage treatment plant is inoculated and added into a main flow area, so that the concentration of the sludge is 1600-6000 mg/L, and the sludge sequentially passes through an anaerobic area 3, an anoxic area 3 and an aerobic area 5, so that a basic environment is provided for denitrifying microorganisms, and the growth of denitrifying bacteria, nitrifying bacteria, phosphorus accumulating bacteria and the like is facilitated; the side-stream pure biological film treatment system 14 is inoculated with an anaerobic ammonia oxidation biological film which is a polyethylene filler biological film with the diameter of 25mm, and when the inoculation condition is not met, a blank biological film carrier can be added, and the film is gradually hung along with the operation of the system; the reflux ratio of the sludge reflux pipe 8 is controlled to be 50% -125%, and the dissolved oxygen concentration of the aerobic zone is controlled to be 1.0-3.0 mg/L, so that the purpose of completing nitrification can be ensured. Supernatant fluid of the sludge fermentation tank 11 and the sludge anaerobic digestion tank and water discharged from a main flow area in a water outlet pipe branch pipe 13 are fed into a side flow pure biological membrane treatment system 14, and flow rate and proportion of the two types of water are adjusted according to the mixed water quality, such as COD/NO control 3 - -N is between 2.0 and 5.0, NO 3 - -N/NH 4 + -N is between 1.0 and 3.0. The hydraulic retention time of the side-stream pure biological membrane treatment system 14 is controlled to be 2-15 h. Thus, after the whole system operates stably, NH is fed in 4 + When the concentration of the-N is 40mg/L and the COD/TN of the inlet water is 4, the concentration of the COD of the outlet water is 20-50 mg/L and the concentration of the NH 4 + The concentration of the-N is 0-1 mg/L, NO 3 - The concentration of N is 4-8 mg/L, and the concentration of TN is 5-10 mg/L.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (5)
1. A system regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced urban sewage and sludge digestion liquid is characterized in that the system comprises:
the main flow area is internally provided with a first water outlet pipe (9) and a secondary sedimentation tank (6), and the water outlet end of the secondary sedimentation tank (6) is connected with the first water outlet pipe (9);
the sludge treatment area comprises a sludge fermentation tank (11) and a sludge anaerobic digestion tank (12), and the bottom of the secondary sedimentation tank (5) is respectively connected with the sludge fermentation tank (11) and the sludge anaerobic digestion tank (12);
the side flow area is connected with supernatant outlets of the sludge fermentation tank (11) and the sludge anaerobic digestion tank (12), the side flow area is also connected with the first water outlet pipe (9), and the side flow area is connected with the main flow area through a water return pipe (16).
2. The system control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A intensified municipal sewage and sludge digestion liquid according to claim 1, wherein the main stream area comprises a primary sedimentation tank (1), an anaerobic area (3), an anoxic area (4) and an aerobic area (5), the bottom of the secondary sedimentation tank (6) is connected with the anaerobic area (3) through a sludge return pipe (8), and the tail end of the aerobic area (5) is connected with the anoxic area (4) through a nitrifying liquid return pipe (7).
3. The system control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestion solution according to claim 2, wherein the side-stream area comprises a side-stream pure biological film treatment system (14), a carrier biological film (15) is arranged in the side-stream pure biological film treatment system (14), and the filling ratio of the carrier biological film (15) is less than 66.7%.
4. The system control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A intensified municipal sewage and sludge digestion liquid according to claim 3, wherein the reflux ratio of the sludge reflux pipe (8) is 50% -100%, the reflux ratio of the nitrifying liquid reflux pipe (7) is 75% -200%, the total hydraulic retention time of the main stream area is 8-17h, the hydraulic retention time of the aerobic area is 5-9h, and the dissolved oxygen at the tail end of the aerobic area is 1-3mg/L.
5. The system control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A enhanced municipal sewage and sludge digestion solution according to claim 4, wherein the system control method comprises the following steps:
the sewage treated by the primary sedimentation tank (1) enters an anaerobic zone (3) through a second water outlet pipe (2), the ammonia nitrogen concentration of the inlet water is 20-75mg/L, the carbon nitrogen ratio is 1.5-6, and the anaerobic zone (3) also introduces part of sludge at the bottom of the secondary sedimentation tank (6) through a sludge return pipe (8);
the sewage treated by the anaerobic zone (3) enters the anoxic zone (4), the aerobic zone (5) discharges nitrifying liquid into the anoxic zone (4) through a nitrifying liquid return pipe (7), and the concentration of nitrate nitrogen in the nitrifying liquid is 5-14mg/L;
the sewage treated by the anoxic zone (4) enters the aerobic zone (5) for aerobic reaction;
the sewage treated by the aerobic zone (5) enters the secondary sedimentation tank (6) for mud-water separation, one part of water at the water outlet end of the secondary sedimentation tank (6) enters the side-stream pure biological membrane treatment system (14), and the other part of water is directly discharged or enters the subsequent advanced treatment;
the other part of sludge at the bottom of the secondary sedimentation tank (6) enters the sludge fermentation tank (11) and the sludge anaerobic digestion tank (12) through a discharge pipe (10), supernatant in the sludge fermentation tank (11) and the sludge anaerobic digestion tank (12) is discharged into the side-stream pure biological membrane treatment system (14), and the side-stream pure biological membrane treatment system (14) also introduces water in a first water outlet pipe (9) into a part through a water outlet pipe branch pipe (13).
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| CN202311754029.4A CN117585814A (en) | 2023-12-19 | 2023-12-19 | System regulation and control method for synchronous denitrification and dephosphorization of side-stream pure biological film PD/A reinforced municipal sewage and sludge digestion liquid |
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