CN110589969B - High-efficiency stable synchronous denitrification and dephosphorization device and method for sewage treatment plant - Google Patents
High-efficiency stable synchronous denitrification and dephosphorization device and method for sewage treatment plant Download PDFInfo
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- CN110589969B CN110589969B CN201911028126.9A CN201911028126A CN110589969B CN 110589969 B CN110589969 B CN 110589969B CN 201911028126 A CN201911028126 A CN 201911028126A CN 110589969 B CN110589969 B CN 110589969B
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- 239000010865 sewage Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 28
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 122
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000004062 sedimentation Methods 0.000 claims abstract description 96
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 70
- 239000011574 phosphorus Substances 0.000 claims abstract description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 63
- 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
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 31
- 238000010992 reflux Methods 0.000 claims description 96
- 239000010802 sludge Substances 0.000 claims description 85
- 238000012544 monitoring process Methods 0.000 claims description 32
- 238000011084 recovery Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 241000894006 Bacteria Species 0.000 description 8
- 239000000706 filtrate Substances 0.000 description 6
- 239000006228 supernatant Substances 0.000 description 6
- 239000013043 chemical agent Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 235000017281 sodium acetate Nutrition 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 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
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening 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
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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 discloses a high-efficiency stable synchronous nitrogen and phosphorus removal device and method for a sewage treatment plant. The device comprises: a primary sedimentation tank, a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank, a deoxidizing tank, a secondary sedimentation tank and a control unit; the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the deoxidizing tank and the secondary sedimentation tank are respectively communicated in sequence through water outlet pipes, and the water outlet pipe of the deoxidizing tank is provided with a first flow control valve; the sewage water inlet main pipeline is communicated with the primary sedimentation tank, and the sewage water inlet pipeline is communicated with the bottom of the pre-anoxic tank through a second flow control valve and a third flow control valve; the water outlet pipe of the primary sedimentation tank is provided with a fourth flow control valve, and is respectively communicated with the bottoms of the anaerobic tank and the anoxic tank through a fifth flow control valve and a sixth flow control valve; an ORP instrument is arranged in the anaerobic tank, and a first nitrate instrument and a second nitrate instrument are respectively arranged in the anoxic tank and the deoxidizing tank. Realizes the high-efficiency utilization of the carbon source in the raw water, increases the concentration of organic matters, and improves the utilization rate of dissolved oxygen and the biological denitrification and dephosphorization effects.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-efficiency stable synchronous nitrogen and phosphorus removal device and method for a sewage treatment plant.
Background
Biological denitrification and dephosphorization needs enough carbon source and sludge age, and reasonable dissolved oxygen is controlled. In order to achieve higher nitrogen and phosphorus removal efficiency, a sewage treatment plant often increases a water inlet carbon source by canceling a primary sedimentation tank, but after canceling the primary sedimentation tank, suspended matters entering a biological tank are increased, so that the biological concentration of an aeration tank is increased, the solid load of a secondary sedimentation tank is improved, the required volume of the biological tank is increased, the utilization efficiency of dissolved oxygen is reduced, the mud leakage risk of the secondary sedimentation tank is increased, and the stability of the nitrogen and phosphorus removal process is sacrificed. Therefore, the method efficiently utilizes the carbon source in the raw water, reasonably controls the amount of suspended solids entering the biological pond, rapidly and efficiently removes the total phosphorus, and is a more efficient and stable enhanced biological denitrification and dephosphorization way.
Disclosure of Invention
The invention aims to provide a high-efficiency stable synchronous nitrogen and phosphorus removal device and method for a sewage treatment plant, which can effectively utilize a carbon source in raw water, effectively increase the concentration of organic matters and improve the utilization rate of dissolved oxygen and the stability of nitrogen and phosphorus removal.
In order to achieve the above purpose, the invention provides a high-efficiency stable synchronous denitrification and dephosphorization device for a sewage treatment plant, comprising: at least one primary sedimentation tank, a pre-anoxic tank, an anaerobic tank, an anoxic tank, at least one aerobic tank, a deoxidizing tank, a secondary sedimentation tank and a control unit;
The primary sedimentation tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the deoxidization tank are respectively provided with a water outlet pipe at the top, and the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the deoxidization tank and the secondary sedimentation tank are respectively communicated with each other in sequence through the water outlet pipes, wherein the water outlet pipe of the deoxidization tank is provided with a first flow control valve;
the sewage water inlet main pipeline is communicated with the primary sedimentation tank, and the sewage water inlet main pipeline is communicated with the bottom of the pre-anoxic tank through a second flow control valve and a third flow control valve;
the water outlet pipe of the primary sedimentation tank is provided with a fourth flow control valve, and the fourth flow control valve is respectively communicated with the bottoms of the anaerobic tank and the anoxic tank through a fifth flow control valve and a sixth flow control valve;
an ORP instrument is arranged in the anaerobic tank, and a first nitrate instrument and a second nitrate instrument are respectively arranged in the anoxic tank and the deoxidizing tank;
the first flow control valve, the second flow control valve, the third flow control valve, the fourth flow control valve, the fifth flow control valve, the sixth flow control valve, the ORP meter, the first nitrate meter and the second nitrate meter are respectively connected with the control unit;
The control unit controls the first flow control valve, the second flow control valve, the third flow control valve, the fourth flow control valve, the fifth flow control valve and the sixth flow control valve to conduct flow control according to measured values of the ORP meter, the first nitrate meter and the second nitrate meter respectively.
Optionally, the oxygen-deficient device further comprises an internal reflux pump, the internal reflux pump is connected with the control unit, the internal reflux pump is provided with a frequency converter, the water inlet end of the internal reflux pump is communicated with the oxygen-deficient tank through a seventh flow control valve, and the water outlet end of the internal reflux pump is communicated with the bottom of the oxygen-deficient tank.
Optionally, the anaerobic treatment device further comprises an external reflux pump, the external reflux pump is connected with the control unit, the external reflux pump is provided with a frequency converter, the water inlet end of the external reflux pump is communicated with the bottom of the secondary sedimentation tank through an eighth flow control valve, and the water outlet end of the external reflux pump is communicated with the pre-anoxic tank through a tenth flow control valve.
Optionally, the device further comprises a residual sludge pump, wherein the residual sludge pump is connected with the control unit, the residual sludge pump is provided with a frequency converter, the water inlet end of the residual sludge pump is communicated with the bottom of the secondary sedimentation tank through an eighth flow control valve, and the water outlet end of the residual sludge pump is communicated with the primary sedimentation tank through a ninth flow control valve.
Optionally, the device also comprises a blower, and the blower is connected with an aeration device arranged in the aerobic tank through a gas flow control valve.
Optionally, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the deoxidizing tank are respectively provided with a stirring device, and the primary sedimentation tank is internally provided with a mud scraping device.
Optionally, the device further comprises a sludge dewatering unit and a mud cake treatment unit, wherein the sludge dewatering unit is connected with the mud cake treatment unit, and the sludge dewatering unit is communicated with the bottom of the primary sedimentation tank through an eleventh flow control valve.
Optionally, the sludge dewatering system further comprises a phosphorus recovery unit, wherein the phosphorus recovery unit is connected with the sludge dewatering unit.
The invention also provides a high-efficiency stable reinforced nitrogen and phosphorus removal method for the sewage treatment plant, which is based on the high-efficiency stable synchronous nitrogen and phosphorus removal device for the sewage treatment plant, and comprises the following steps:
the control unit calculates the inflow load of the primary sedimentation tank based on the flow of the fourth flow control valve, and when the inflow load is larger than a load threshold value, the control unit adjusts the flow of the second flow control valve and the third flow control valve until the inflow load of the primary sedimentation tank is smaller than the load threshold value;
The control unit controls the sum of the flow rates of the fifth flow control valve and the sixth flow control valve to be equal to the flow rate of the fourth flow control valve;
when the monitored value of the ORP meter is larger than an ORP preset maximum value, the control unit controls the opening of the fifth flow control valve to be increased until the monitored value of the ORP meter is smaller than the ORP preset maximum value, if the monitored value of the ORP meter is still larger than the ORP preset maximum value after the monitored value of the fifth flow control valve reaches the system preset maximum value, the control unit controls the opening of the fifth flow control valve to be unchanged and reduces the opening of the sixth flow control valve until the monitored value of the ORP meter is smaller than the ORP preset maximum value, if the monitored value of the ORP meter is still larger than the ORP preset maximum value after the monitored value of the sixth flow control valve is reduced to the system preset minimum value, the control unit controls the opening of the sixth flow control valve to be unchanged and increases the opening of the third flow control valve, and if the opening of the third flow control valve is increased to the system preset maximum value, and the opening of the third flow control valve is still unchanged;
When the monitored value of the ORP meter is smaller than an ORP preset minimum value, the control unit controls the opening of the fifth flow control valve to be reduced until the monitored value of the ORP meter is larger than the ORP preset minimum value, if the monitored value of the ORP meter is still smaller than the ORP preset minimum value after the opening of the fifth flow control valve is smaller than the system preset minimum value, the opening of the fifth flow control valve is kept unchanged, and the opening of the sixth flow control valve is increased until the monitored value of the ORP meter is larger than the ORP preset minimum value, and if the opening of the sixth flow control valve is increased to the system preset maximum value, the monitored value of the ORP meter is still smaller than the ORP preset minimum value, and the opening of the sixth flow control valve is kept unchanged;
when the monitoring value of the first nitrate meter is larger than a first nitrate preset maximum value, if the monitoring value of the ORP meter is still larger than the ORP preset maximum value, the system state is kept unchanged;
if the monitored value of the ORP meter is smaller than the preset minimum value of the ORP, the control unit controls the opening of the second flow control valve and the opening of the third flow control valve to be increased, and when the monitored value of the first nitrate meter is still larger than the preset maximum value of the first nitrate after the opening of the second flow control valve and the third flow control valve is increased to the preset maximum value, the opening of the second flow control valve and the opening of the third flow control valve are kept unchanged;
If the monitored value of the ORP meter is between a preset minimum value and a preset maximum value, the control unit controls the opening of the second flow control valve and the third flow control valve to be increased, and the monitored value of the ORP meter is kept between the preset minimum value and the preset maximum value by adjusting the opening of the fifth flow control valve and the sixth flow control valve, and when the monitored value of the first nitrate meter is larger than the preset maximum value of the first nitrate after the opening of the second flow control valve and the third flow control valve is increased to the preset maximum value, the opening of the second flow control valve and the third flow control valve is kept unchanged;
when the monitored value of the first nitrate meter is smaller than a preset minimum value of nitrate, the control unit controls the opening degree of the sixth flow control valve to be reduced until the monitored value of the first nitrate meter is larger than the preset minimum value of nitrate, and if the monitored value of the nitrate meter is still smaller than the preset minimum value of nitrate after the opening degree of the sixth flow control valve is reduced to the preset minimum value of the system, the opening degree of the sixth flow control valve is kept unchanged.
In one example, the efficient and stable enhanced nitrogen and phosphorus removal method of the sewage treatment plant further comprises:
When the monitoring value of the second nitrate meter is larger than a nitrate preset maximum value, the control unit controls the flow of the internal reflux pump to gradually increase until the monitoring value of the second nitrate meter is smaller than the nitrate preset maximum value, and if the monitoring value of the second nitrate meter is still larger than the nitrate preset maximum value after the internal reflux ratio is increased to the set value maximum value, the control unit controls the flow of the internal reflux pump to remain unchanged and carries out alarm prompt;
when the internal reflux ratio is increased to a set value maximum value, the monitoring value of the second nitrate meter is still larger than the nitrate preset maximum value, the control unit controls the flow of the external reflux pump to be gradually increased until the monitoring value of the second nitrate meter is smaller than the nitrate preset maximum value, when the external reflux ratio is increased to a system set maximum value, the monitoring value of the second nitrate meter is still larger than the nitrate preset maximum value, and the control unit controls the flow of the external reflux pump to be unchanged and carries out alarm prompt;
wherein the internal reflux ratio is the ratio of the flow value of the seventh flow control valve to the sum of the flow values of the second flow control valve and the fourth flow control valve; the external reflux ratio is a ratio of a flow value of the tenth flow control valve to a sum of flow values of the second flow control valve and the fourth flow control valve.
The invention has the beneficial effects that:
(1) The sewage is respectively injected into the primary sedimentation tank and the pre-anoxic tank through a sewage water inlet main pipeline and a sewage water inlet pipeline, and carbon source-containing sewage is added at different points in different biochemical tanks, so that the full utilization of raw water carbon sources is realized; and adding partial raw water or primary sedimentation water in the primary sedimentation tank into the pre-anoxic tank, the anaerobic tank and the anoxic tank at different points to ensure the required carbon sources for dephosphorization and denitrification, so that the system has high-efficiency biological dephosphorization and denitrification effects.
Further, adding part of raw water and external reflux sludge into a pre-anoxic tank, adding primary sedimentation water into an anaerobic tank and an anoxic tank at different points, reasonably controlling suspended matters entering a biological tank, ensuring strict anaerobic environment and biological carbon source of the anaerobic tank, reducing the dosage of external carbon source and dephosphorization medicament, and thereby playing a high-efficiency biological dephosphorization role of the system; the flow control valves and the internal and external reflux pumps are reasonably controlled by the control unit according to the monitoring values of the ORP instrument, the first nitrate instrument and the first nitrate instrument, and finally the high-efficiency and stable synchronous denitrification and dephosphorization effect of the system is realized; and introducing the excess sludge into a primary sedimentation tank, mixing the excess sludge with the primary sedimentation sludge by using the primary sedimentation tank, realizing efficient sedimentation of the sludge, saving a sludge concentration unit, and saving a sludge pre-dewatering agent.
(2) The control unit is used for controlling the water inflow load of the primary sedimentation tank to ensure the high efficiency and stability of the primary sedimentation tank, and simultaneously, the control unit is used for analyzing the nitrate value parameter of the biochemical tank in real time, and when the nitrate value parameter exceeds the preset threshold range, the flow of the related flow control valve is regulated to keep the nitrate value within the preset threshold range, so that the high efficiency and stable synchronous denitrification and dephosphorization effect of the system is realized.
The device of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
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 structural diagram of a high-efficiency stable synchronous denitrification and dephosphorization device for a sewage treatment plant according to an embodiment of the present invention.
Fig. 2 shows a diagram of parameter index change of total nitrogen, nitrate nitrogen and ammonia nitrogen in a biological pond of a high-efficiency stable synchronous nitrogen and phosphorus removal device of a sewage treatment plant according to an embodiment of the invention.
Fig. 3 shows a biological pond extended range orthophosphate change diagram of a high-efficiency stable synchronous denitrification and dephosphorization device of a sewage treatment plant according to an embodiment of the present invention.
Fig. 4 shows a comparison diagram of total phosphorus parameters of effluent of a high-efficiency stable synchronous nitrogen and phosphorus removal device of a sewage treatment plant according to an embodiment of the invention.
Fig. 5 shows a comparison chart of the dosing rate of a dephosphorizing agent of a high-efficiency stable synchronous denitrification and dephosphorizing device of a sewage treatment plant according to an embodiment of the invention.
Reference numerals illustrate:
1. a primary sedimentation tank; 2. a pre-anoxic tank; 3. an anaerobic tank; 4. an anoxic tank; 5. an aerobic tank; 6. a deoxidizing pool; 7. a secondary sedimentation tank; 8. a control unit; 9. an ORP meter; 10. a second nitrate meter; 11. an internal reflux pump; 12. a frequency converter; 13. an external reflux pump; 14. a stirring device; 15. a mud scraping device; 16. a second flow control valve; 17. a fourth flow control valve; 18. a third flow control valve; 19. a fifth flow control valve; 20. a sixth flow control valve; 21. a blower; 22. a first gas flow control valve; 23. a second gas flow control valve; 24. a third gas flow control valve; 25. an aeration device; 26. a seventh flow control valve; 27. a first flow control valve; 28. an eighth flow control valve; 29. a tenth flow control valve; 30. a residual sludge pump; 31. a first nitrate meter; 32. a ninth flow control valve; 33. an eleventh flow control valve; 34. a sludge dewatering system; 35. a phosphorus recovery system; 36. a mud cake treatment system; 37. phosphorus recovery subsequent systems; 38. the supernatant fluid is discharged from the pipeline.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are illustrated in the drawings, 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.
A 2 The flora of the/O biological denitrification and dephosphorization system mainly comprises nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria. In the aerobic section, nitrifying bacteria convert ammonia nitrogen in sewage into nitrate through biological nitrification; in the anoxic section, the denitrifying bacteria convert nitrate brought by reflux into nitrogen through biological denitrification and escape into the atmosphere, so as to achieve the aim of denitrification; in the anaerobic section, phosphorus is released by the phosphorus accumulating bacteria, and easily degradable organic matters such as low-grade fatty acid and the like are absorbed; in the aerobic section, the phosphorus accumulating bacteria can absorb phosphorus in excess and remove the phosphorus through the discharge of the residual sludge. The invention belongs to a high-efficiency stable synchronous nitrogen and phosphorus removal device and method for a sewage treatment plant, in particular to A 2 An auxiliary device and a method for efficiently utilizing a carbon source in raw water, controlling the quantity of suspended solids entering a biological pond, reducing the dosage of an external carbon source and a dephosphorization reagent and improving the utilization rate of dissolved oxygen and the stability of denitrification and dephosphorization in the sewage treatment technology of an O process.
Fig. 1 is a schematic structural view showing an efficient and stable synchronous nitrogen and phosphorus removal apparatus for a sewage treatment plant according to an embodiment of the present invention, as shown in fig. 1, comprising: at least one primary sedimentation tank 1, a pre-anoxic tank 2, an anaerobic tank 3, an anoxic tank 4, at least one aerobic tank 5, a deoxidizing tank 6, a secondary sedimentation tank 7 and a control unit 8;
the top parts of the primary sedimentation tank 1, the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5 and the deoxidization tank 6 are respectively provided with water outlet pipes, the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5 and the deoxidization tank 6 as well as the secondary sedimentation tank 7 are respectively communicated in sequence through the water outlet pipes, wherein the water outlet pipe of the deoxidization tank 6 is provided with a first flow control valve 27;
the sewage water inlet main pipeline is communicated with the primary sedimentation tank 1, and the sewage water inlet branch pipeline is communicated with the bottom of the pre-anoxic tank 2 through a second flow control valve 16 and a third flow control valve 18;
the water outlet pipe of the primary sedimentation tank 1 is provided with a fourth flow control valve 17, and the fourth flow control valve 17 is respectively communicated with the bottoms of the anaerobic tank 3 and the anoxic tank 4 through a fifth flow control valve 19 and a sixth flow control valve 20;
an ORP instrument 9 is arranged in the anaerobic tank 3, and a first nitrate instrument 31 and a second nitrate instrument 10 are respectively arranged in the anoxic tank 4 and the deoxidizing tank 6;
The first flow control valve 27, the second flow control valve 16, the third flow control valve 18, the fourth flow control valve 17, the fifth flow control valve 19, the sixth flow control valve 20, the ORP meter 9, the first nitrate meter 31 and the second nitrate meter 10 are respectively connected with the control unit 8;
the control unit 8 controls the first flow rate control valve 27, the second flow rate control valve 16, the third flow rate control valve 18, the fourth flow rate control valve 17, the fifth flow rate control valve 19, and the sixth flow rate control valve 20 based on the measurement values of the ORP meter 9, the first nitrate meter 31, and the second nitrate meter 10, respectively.
Specifically, the sewage is respectively injected into the primary sedimentation tank 1 and the pre-anoxic tank 2 through a sewage water inlet main pipeline and a sewage water inlet pipeline, and carbon source-containing sewage is added at different points in different biochemical tanks, so that the full utilization of raw water carbon sources is realized; adding partial raw water or primary sedimentation water in the primary sedimentation tank 1 into the pre-anoxic tank 2, the anaerobic tank 3 and the anoxic tank 4 at different points to ensure the required carbon sources for dephosphorization and denitrification, so that the system has high-efficiency biological dephosphorization and denitrification effects; adding part of raw water into a pre-anoxic tank, adding primary sedimentation water into an anaerobic tank 3 and an anoxic tank 4 at different points, reasonably controlling suspended matters entering a biological tank, and ensuring strict anaerobic environment and biological carbon source of the anaerobic tank 3 so as to play a role in high-efficiency biological dephosphorization of a system; the flow of each flow control valve is reasonably controlled by the control unit 8 according to the monitoring values of the ORP instrument 9, the first nitrate instrument 31 and the second nitrate instrument 10, and finally the high-efficiency and stable synchronous denitrification and dephosphorization effect of the system is realized.
Further, referring to fig. 1, in this embodiment, there are a plurality of primary sedimentation tanks 1, and the plurality of primary sedimentation tanks 1 are sequentially connected; the number of the aerobic tanks 5 is three, the three aerobic tanks 5 are sequentially communicated, wherein the bottoms of the first aerobic tank 5 and the second aerobic tank 5 are communicated, the upper parts of the second aerobic tank 5 and the third aerobic tank 5 are communicated, the ORP meter 9 is arranged at the tail end in the anaerobic tank 3, and the first nitrate meter 31 and the second nitrate meter 10 are respectively arranged at the tail ends in the anoxic tank 4 and the deoxidizing tank 6. And the heights of the water outlet pipes of the primary sedimentation tank 1, the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5 and the deoxidization tank 6 are sequentially reduced, sewage is treated step by step in an overflow mode among a plurality of biochemical tanks, and the sewage purifying effect is improved while the sewage backmixing of different biochemical tanks is prevented. The control unit 8 in this embodiment is a controller provided with a CPU, the ORP meter 9 is an existing ORP online tester technology, and is used for monitoring the temperature, PH value, and oxidizing and reducing properties of the water in the anaerobic tank 3, so as to reflect the anaerobic environment in the anaerobic tank 3, and the first nitrate meter 31 and the second nitrate meter 10 are existing online nitrate monitors, and are used for monitoring the nitrate content in the water.
In this embodiment, the anaerobic treatment device further comprises an internal reflux pump 11, the internal reflux pump 11 is connected with the control unit 8, the internal reflux pump 11 is provided with a frequency converter 12, the water inlet end of the internal reflux pump 11 is communicated with the deoxidization tank 6 through a seventh flow control valve 26, and the water outlet end of the internal reflux pump 11 is communicated with the bottom of the anoxic tank 4.
Specifically, nitrate in the deoxidizing pool 6 is conveyed back to the anoxic pool 4 through the internal reflux pump 11, and in the anoxic pool 4, denitrifying bacteria convert nitrate brought by reflux into nitrogen gas through biological denitrification and escape into the atmosphere, so that the aim of denitrification is fulfilled.
In this embodiment, the anaerobic treatment device further comprises an external reflux pump 13, the external reflux pump 13 is connected with the control unit 8, the external reflux pump 13 is provided with a frequency converter 12, the water inlet end of the external reflux pump 13 is communicated with the bottom of the secondary sedimentation tank 7 through an eighth flow control valve 28, and the water outlet end of the external reflux pump 13 is communicated with the pre-anoxic tank 2 through a tenth flow control valve 29.
Specifically, part of raw water and external reflux sludge are added into the pre-anoxic tank 2, primary sedimentation water is added into the anaerobic tank 3 and the anoxic tank 4 in a separated point manner, suspended matters entering the biological tank are reasonably controlled, the strict anaerobic environment and biological carbon source of the anaerobic tank 3 are ensured, the dosage of the external carbon source and the dephosphorization medicament is reduced, and therefore the efficient biological dephosphorization effect of the system is exerted.
Further, in the prior art, the surplus sludge is generally returned to the anaerobic tank, and because the sludge returned from the outside contains dissolved oxygen, the anaerobic environment of the anaerobic tank is influenced, so that the surplus sludge is returned to the pre-anoxic tank 2 in the scheme, the influence of the dissolved oxygen in the surplus sludge on the anaerobic environment in the anaerobic tank 3 can be effectively avoided, and the strict anaerobic environment of the anaerobic tank 3 is ensured.
In one example, the secondary sedimentation tank further comprises a residual sludge pump 30, wherein the water inlet end of the residual sludge pump 30 is communicated with the bottom of the secondary sedimentation tank 7 through an eighth flow control valve 28, and the water outlet end of the residual sludge pump 30 is communicated with the primary sedimentation tank 1 through a ninth flow control valve 32.
Specifically, part of the excess sludge in the secondary sedimentation tank 7 is conveyed back to the primary sedimentation tank 1 through the excess sludge pump 30, the excess sludge and the original sludge are fully mixed in the primary sedimentation tank 1, biological phosphorus release is carried out on a sludge layer, high-concentration phosphorus-containing filtrate is produced through rapid dehydration, biological phosphorus release is facilitated in the primary sedimentation tank 1 due to good anaerobic conditions after the primary sedimentation tank 1 and the excess sludge are mixed, then the conventional struvite stone method can be utilized for high-efficiency recovery, the biological phosphorus removal effect is enhanced, no chemical agent or little chemical agent is required to be added in a biological section, and the purposes of saving the chemical agent and effectively recovering phosphorus resources are achieved.
Further, introducing excess sludge into the primary sedimentation tank 1, mixing the excess sludge with the primary sedimentation sludge by using the primary sedimentation tank 1, realizing efficient sedimentation of the sludge, and saving a sludge concentration unit; meanwhile, as the two types of sludge are fully mixed in the primary sedimentation tank 1, the fluctuation range of the water content of the mixed sludge conveyed to the sludge dewatering system 34 is small, the dewatering stability and the dewatering agent saving amount are improved; in addition, the primary sedimentation sludge and the residual sludge are mixed, the biological phosphorus release is facilitated in the primary sedimentation tank under better anaerobic conditions, and the dewatered filtrate is collected after sludge dewatering for high-concentration phosphorus recovery, so that the high-efficiency phosphorus removal of the whole process is realized.
In this embodiment, the aeration device further comprises a blower 21, and the blower 21 is connected with an aeration device 25 arranged in the aerobic tank 5 through a gas flow control valve.
Specifically, referring to fig. 1, an aeration device 25 is respectively provided in each of the three aerobic tanks 5, oxygen in the aerobic tank 5 is increased by supplying air by a blower 21, and the blower 21 is respectively connected with a third gas flow control valve 24 and three aeration devices 25 through a first gas flow control valve 22, a second gas flow control valve 23.
In the embodiment, a stirring device 14 is respectively arranged in the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5 and the deoxidizing tank 6, and a mud scraping device 15 is arranged in the primary sedimentation tank 1.
Specifically, the stirring device 14 is used for improving the reaction effect, and the mud scraping device 15 is used for scraping the mud in the primary sedimentation tank 1 into a mud bucket.
In this embodiment, the sludge dewatering device further comprises a sludge dewatering unit and a sludge cake treatment unit, wherein the sludge dewatering unit is connected with the sludge cake treatment unit, and the sludge dewatering unit is communicated with the bottom of the primary sedimentation tank 1 through an eleventh flow control valve 33. The device also comprises a phosphorus recovery unit, wherein the phosphorus recovery unit is connected with the sludge dewatering unit.
Specifically, the sludge dewatering unit, the sludge cake processing unit and the phosphorus recovery unit in the present embodiment are an existing sludge dewatering system 34, a sludge cake processing system 36 and a phosphorus recovery system 35, respectively, and the sludge dewatering system 34 is communicated with the primary sedimentation tank 1 through an eleventh flow control valve 33; the filtrate pipeline of the sludge dewatering system 34 is connected with a phosphorus recovery system 35, and the phosphorus recovery system 35 is connected with a supernatant discharge pipeline 38 and a phosphorus recovery subsequent system 37; a mud cake processing system 36 is connected to the mud dewatering system 34 by a mud discharge line.
Each flow control valve in this embodiment is an existing electric valve with a flowmeter, and the electric valve can adjust the size of the passing water flow of the valve according to the control signal of the control unit 8, so as to control the water flow.
The invention relates to a high-efficiency stable reinforced nitrogen and phosphorus removal method for a sewage treatment plant, which is based on the high-efficiency stable synchronous nitrogen and phosphorus removal device for the sewage treatment plant, and comprises the following steps:
the control unit 8 calculates the inflow load of the primary sedimentation tank 1 based on the water quality and water quantity data collected by the control unit in real time and the flow rate of the fourth flow control valve 17, and when the inflow load is larger than the load threshold value, the control unit 8 adjusts the flow rates of the second flow control valve 16 and the third flow control valve 18 until the inflow load of the primary sedimentation tank 1 is smaller than the load threshold value;
the control unit 8 controls the sum of the flow rates of the fifth flow control valve 19 and the sixth flow control valve 20 to be equal to the flow rate of the fourth flow control valve 17; the sum of the flow rates of the second flow control valve 16 and the fourth flow control valve 17 is equal to the total inflow of the system;
when the monitored value of the ORP meter 9 is larger than the preset maximum value of ORP, the control unit 8 controls the opening of the fifth flow control valve 19 to increase until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the opening of the fifth flow control valve 19 reaches the preset maximum value of ORP, the state of the fifth flow control valve 19 is kept unchanged to be properly reduced until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the sixth flow control valve 20 is reduced to the preset minimum value of ORP, the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the state of the sixth flow control valve 20 is reduced to be the preset minimum value of ORP, the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged to be properly increased, and signals of the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged to be input to the control unit;
When the monitored value of the ORP meter 9 is smaller than the ORP preset minimum value, the control unit 8 controls the opening of the fifth flow control valve 19 to decrease until the monitored value of the ORP meter 9 is larger than the ORP preset minimum value, if the monitored value of the ORP meter is still smaller than the ORP preset minimum value after the opening of the fifth flow control valve 19 is smaller than the system preset minimum value, the state of the fifth flow control valve 19 is kept unchanged, the opening of the sixth flow control valve 20 is properly increased until the monitored value of the ORP meter is larger than the ORP preset minimum value, and if the monitored value of the ORP meter is still smaller than the ORP preset minimum value after the opening of the sixth flow control valve 20 is increased to the system preset maximum value, the state of the sixth flow control valve 20 is kept unchanged, and the opening and flow signals of the control valves are transmitted to the control unit;
when the monitoring value of the first nitrate meter 31 is larger than the preset maximum value of the first nitrate, the control unit 8 analyzes the detection signal of the ORP meter 9 and the opening and flow information of each control valve, and if the monitoring value of the ORP meter 9 is still in a state larger than the preset maximum value of the ORP, the system keeps the original state unchanged and the opening and flow signals of each control valve are transmitted to the control unit in real time; if the monitored value of the ORP meter 9 is smaller than the ORP preset minimum value state, the opening of the second flow control valve 16 and the third flow control valve 18 are properly increased, and when the monitored value of the first nitrate meter 31 is still larger than the first nitrate preset maximum value after the opening of the second flow control valve 16 and the third flow control valve 18 is increased to the preset maximum value, the state of the second flow control valve 16 and the third flow control valve 18 is kept unchanged, and the opening and the flow signals of the control valves are transmitted to the control unit in real time; if the monitored value of the ORP meter 9 is between the preset minimum value and the maximum value, the opening of the second flow control valve 16 and the third flow control valve 18 are properly increased, the monitored value of the ORP meter 9 is kept between the preset minimum value and the maximum value by adjusting the opening of the fifth flow control valve 19 and the sixth flow control valve 20, when the monitored value of the first nitrate meter 31 is larger than the preset maximum value of the first nitrate after the opening of the second flow control valve 16 and the third flow control valve 18 is increased to the preset maximum value, the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged, and the opening and the flow signals of the control valves are transmitted to a control unit;
When the monitored value of the first nitrate meter 31 is smaller than the preset minimum value of nitrate, the control unit 8 controls the flow of the sixth flow control valve 20 to decrease until the monitored value of the first nitrate meter is larger than the preset minimum value of nitrate, and if the monitored value of the first nitrate meter is still smaller than the preset minimum value of nitrate after the monitored value of the sixth flow control valve 20 is decreased to the preset minimum value of nitrate, the state of the sixth flow control valve 20 is kept unchanged.
The sewage treatment method further comprises the following steps: when the monitoring value of the second nitrate meter 10 is larger than the preset maximum value of nitrate, the control unit 8 controls the flow of the internal reflux pump 11 to gradually increase until the monitoring value of the second nitrate meter 10 is smaller than the preset maximum value of nitrate, and if the monitoring value of the second nitrate meter 10 is still larger than the preset maximum value of nitrate after the internal reflux ratio is increased to the set value maximum value, the control unit 8 controls the flow of the internal reflux pump 11 to remain unchanged and carries out alarm prompt;
when the internal reflux ratio is increased to the set value maximum value, the flow of the external reflux pump 13 is controlled by the control unit 8 to be gradually increased until the monitored value of the external reflux pump 13 is smaller than the nitrate preset maximum value, when the internal reflux ratio is increased to the system set maximum value, the monitored value of the external reflux pump 10 is still larger than the nitrate preset maximum value, the flow of the external reflux pump 13 is controlled by the control unit 8 to be unchanged, and alarm prompt is carried out;
Wherein the internal reflux ratio is the ratio of the flow value of the seventh flow control valve 26 to the sum of the flow values of the second flow control valve 16 and the fourth flow control valve 17; the external reflux ratio is a ratio of the flow rate value of the tenth flow rate control valve 29 to the sum of the flow rate values of the second flow rate control valve 16 and the fourth flow rate control valve 17.
Specifically, the sewage treatment method comprises the following specific steps:
1) The control unit 8 collects water quality and water quantity data and fourth flow control valve 17 data in real time based on the control unit, controls the second flow control valve 16 and the fourth flow control valve 17 to work at set values, calculates the load of the primary sedimentation tank 1 in real time by collecting the water quality and water quantity data and the fourth flow control valve 17 flow in real time, and if the surface hydraulic load of the primary sedimentation tank 1 is found to exceed the set values (the set value takes the range of 1.5-5 m) 3 After the excess water amount value is analyzed by the control unit 8 according to an internal logic algorithm, and the second flow control valve 16 and the third flow control valve 18 on the water inlet branch pipe are controlled to be opened to the excess water amount value so as to ensure that the water inlet load of the primary sedimentation tank 1 is smaller than a set maximum value, thereby ensuring the efficient and stable operation of the primary sedimentation tank 1, and recovering the operation of the systems according to the original set values when the load of the primary sedimentation tank 1 is operated within the set value range;
2) The control unit 8 controls the following systems to normally operate according to the set values, after the key parameters of the systems change the original set values, the control unit 8 analyzes the related parameters in the systems in real time, and after the key parameters in the systems recover the original set values, the control unit 8 controls the systems to recover the operation states of the original set values.
3) The control unit 8 controls the fifth flow control valve 19 and the sixth flow control valve 20 to stably operate at respective set values, and distributes one system flow with the change of the other system flow of the electric valve and the flowmeter, so that the sum of the flow values of the two is equal to the flow value of the fourth flow control valve 17;
4) The control unit 8 monitors the ORP meter 9 data in real time, and if the value of the ORP meter 9 runs within a set value range (the minimum and maximum set value ranges of ORP are-200 mV to 50 mV), the control unit 8 controls the flow of the fifth flow control valve 19 to be unchanged;
5) When the monitored value of the ORP meter 9 is larger than the preset maximum value of ORP, the control unit 8 controls the opening of the fifth flow control valve 19 to increase until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the opening of the fifth flow control valve 19 reaches the preset maximum value of ORP, the state of the fifth flow control valve 19 is kept unchanged to be properly reduced until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the sixth flow control valve 20 is reduced to the preset minimum value of ORP, the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the state of the sixth flow control valve 20 is reduced to be the preset minimum value of ORP, the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged to be properly increased, and signals of the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged to be input to the control unit;
6) When the monitored value of the ORP meter 9 is smaller than the ORP preset minimum value, the control unit 8 controls the opening of the fifth flow control valve 19 to decrease until the monitored value of the ORP meter 9 is larger than the ORP preset minimum value, if the monitored value of the ORP meter is still smaller than the ORP preset minimum value after the opening of the fifth flow control valve 19 is smaller than the system preset minimum value, the state of the fifth flow control valve 19 is kept unchanged, the opening of the sixth flow control valve 20 is properly increased until the monitored value of the ORP meter is larger than the ORP preset minimum value, and if the monitored value of the ORP meter is still smaller than the ORP preset minimum value after the opening of the sixth flow control valve 20 is increased to the system preset maximum value, the state of the sixth flow control valve 20 is kept unchanged, and the opening and flow signals of the control valves are transmitted to the control unit;
7) The control unit 8 controls the sixth flow control valve 20 to stably operate at a set flow value, and performs intake water quality analysis in real time and detects and monitors the data of the first nitrate meter 31. If the analysis results in insufficient carbon source in the inflow water, adding a proper amount of carbon source into the anoxic zone to perform denitrification; if the carbon source in the water is sufficient or the carbon source in the water is insufficient but sufficient carbon source is added, if the nitrate data value runs within the set value range (the minimum and maximum value ranges are set by the first nitrate meter 31 to be 0-10 mg/L), the control unit 8 controls the flow of the sixth flow control valve 20 to be unchanged;
8) When the monitoring value of the first nitrate meter 31 is larger than the preset maximum value of the first nitrate, the control unit 8 analyzes the detection signal of the ORP meter 9 and the opening and flow information of each control valve, and if the monitoring value of the ORP meter 9 is still in a state larger than the preset maximum value of the ORP, the system keeps the original state unchanged and the opening and flow signals of each control valve are transmitted to the control unit in real time; if the monitored value of the ORP meter 9 is smaller than the ORP preset minimum value state, the opening of the second flow control valve 16 and the third flow control valve 18 are properly increased, and when the monitored value of the first nitrate meter 31 is still larger than the first nitrate preset maximum value after the opening of the second flow control valve 16 and the third flow control valve 18 is increased to the preset maximum value, the state of the second flow control valve 16 and the third flow control valve 18 is kept unchanged, and the opening and the flow signals of the control valves are transmitted to the control unit in real time; if the monitored value of the ORP meter 9 is between the preset minimum value and the maximum value, the opening of the second flow control valve 16 and the third flow control valve 18 are properly increased, the monitored value of the ORP meter 9 is kept between the preset minimum value and the maximum value by adjusting the opening of the fifth flow control valve 19 and the sixth flow control valve 20, when the monitored value of the first nitrate meter 31 is larger than the preset maximum value of the first nitrate after the opening of the second flow control valve 16 and the third flow control valve 18 is increased to the preset maximum value, the states of the second flow control valve 16 and the third flow control valve 18 are kept unchanged, and the opening and the flow signals of the control valves are transmitted to a control unit;
9) When the data value of the first nitrate meter 31 is smaller than the set minimum value, the control unit 8 controls the flow of the sixth flow control valve 20 to decrease until the value is larger than the set minimum value, and if the flow of the sixth flow control valve 20 is reduced to the system set minimum value and still does not meet the set value requirement, the state is maintained.
10 The control unit 8 monitors the data of the second nitrate meter 10, the parameters of the internal reflux seventh flow control valve 26 and the parameters of the internal reflux pump 11 in real time and controls the normal operation of the internal reflux seventh flow control valve and the internal reflux pump at a set value. The seventh flow control valve 26 flow value divided by the sum of the second flow control valve 16 and fourth flow control valve 17 system flow is the process system internal reflux ratio. When the value of the second nitrate meter 10 is larger than 15mg/L, the control unit 8 controls the flow of the internal reflux pump 11 to gradually increase, and when the internal reflux ratio is increased to the set value maximum value (the set minimum and maximum value ranges are 80-300%), the nitrate value of the discharged water is still larger than 15mg/L, the control unit 8 controls the flow of the internal reflux pump 11 to remain unchanged, and the control unit 8 carries out alarm prompt;
11 The control unit 8 monitors the second nitrate meter 10 data, the external reflux eighth flow control valve 28 parameters, and the external reflux pump 13 parameters in real time. The tenth flow control valve 29 flow value divided by the sum of the second flow control valve 16 and fourth flow control valve 17 system flow is the process system external reflux ratio. The control unit 8 adjusts the flow of the external reflux pump 13 to enable the external reflux ratio to run at a set value, when the value of the second nitrate meter 10 is larger than 15mg/L and the internal reflux ratio is increased to the maximum set value of the system, the control unit 8 controls the flow of the external reflux pump 13 to gradually increase, when the external reflux ratio is increased to the maximum set value of the system (the range of the set minimum and maximum values is 50-250%), the nitrate value of the outlet water is still larger than 15mg/L, the control unit 8 controls the flow of the external reflux pump 13 to remain unchanged, and alarm prompt is carried out in the control unit 8;
12 The control unit 8 controls the eleventh flow control valve 33 to discharge the residual and primary sludge mixed to the sludge dewatering system 34 by setting the residence time (the range of the setting value is 4-72 h) and the discharge amount of the residual and primary sludge, the dewatered sludge cake is discharged to the sludge dewatering system through the sludge cake treatment system 36, the sludge dewatering filtrate flows into the phosphorus recovery system 35 for phosphorus recovery, the recovered supernatant is discharged through the supernatant discharge pipeline 38, and the recovered substance is subjected to corresponding treatment through the phosphorus recovery subsequent system 37;
the steps 1-11 are repeated to realize the biological denitrification and dephosphorization treatment of the sewage by the high-efficiency stable synchronous denitrification and dephosphorization device of the sewage treatment plant.
The high-efficiency stable synchronous nitrogen and phosphorus removal device and the nitrogen and phosphorus removal method of the sewage treatment plant of the embodiment are carried out at 100 ten thousand meters 3 And/d, the regeneration water treatment plant is applied. The hydraulic retention time of the primary sedimentation tank 1 is 1.5 to 3.5 hours, the hydraulic retention time ranges of the pre-anoxic zone, the anaerobic zone, the anoxic zone and the aerobic zone are respectively 0.3 to 0.8 hour, 0.1 to 0.5 hour, 1.2 to 2.8 hours and 7 to 9 hours, the internal reflux ratio ranges from 80 percent to 350 percent, the external reflux range ranges from 60 percent to 150 percent, and the dosage rate of the external carbon source (sodium acetate) is 20 to 60mg/L when the carbon source of the inflow water is insufficient.
1) The control unit 8 monitors the data of the fourth flow control valve 17 in real time and controls the flow of the electric valve and the flowmeter system (16) to be 10 ten thousand m 3 And calculating the actual water inflow load of the primary sedimentation tank 1 in real time by the water inflow quality and water amount data and the flow of the fourth flow control valve 17, and finding that the surface hydraulic load of the primary sedimentation tank 1 does not exceed the set value (the set value range is 1.5-5 m) 3 V.. Square meter h)), the second flow control valve 16 is maintained to operate at a set point (accounting for the total inlet water flow)10% of the amount);
2) The control unit 8 monitors the data of the ORP instrument 9 in real time, the data value of the ORP instrument 9 is normally changed within the range of a set value (-200 mV-50 mV), and the control unit 8 controls the flow of the fourth flow control valve 17 to be 90 ten thousand m 3 /d；
3) The control unit 8 performs water quality analysis in real time, detects and monitors data of the first nitrate meter 31, analyzes and obtains insufficient carbon source in the water, and adds a proper amount of carbon source (the sodium acetate dosage rate is 20-60 mg/L) in the anoxic zone to perform full denitrification;
4) The nitrate data value operates in the set value range under the normal operation condition of insufficient carbon source of the inflow water and sufficient carbon source of the addition (the range of the minimum value and the maximum value set by the first nitrate meter 31 is 0-10 mg/L), and the control unit 8 controls the flow rates of the fifth flow control valve 19 and the sixth flow control valve 20 to be unchanged;
5) The control unit 8 monitors the monitoring data of the second nitrate meter 10, the parameters of the internal reflux seventh flow control valve 26 and the parameters of the internal reflux pump 11 in real time and controls the internal reflux pump to normally operate at a set value. In the normal operation process, the value of the second nitrate meter 10 is smaller than 15mg/L, and the control unit 8 controls the flow range of the internal reflux pump 11 to be 80-300% of the internal reflux ratio;
6) The control unit 8 monitors the data of the second nitrate meter 10, the parameters of the external reflux eighth flow control valve 28 and the parameters of the external reflux pump 13 in real time. In the normal operation process, the numerical value of the second nitrate meter 10 is smaller than 15mg/L, and the control unit 8 adjusts the flow of the external reflux pump 13 to enable the external reflux ratio to operate within the range of 50-200%;
7) The control unit 8 controls the eleventh flow control valve 33 to discharge the residual and primary mixed sludge to the sludge dewatering system 34 by setting the residence time of the residual and primary mixed sludge to 4-24 hours, the dewatered sludge cake is discharged to the sludge dewatering system through the sludge cake treatment system 36, the sludge dewatering filtrate flows into the phosphorus recovery system 35 for phosphorus recovery, the recovered supernatant is discharged through the supernatant discharge pipeline 38, and the recovered substance is correspondingly treated through the phosphorus recovery subsequent system 37;
8) Through a period of actual operation, the system analyzes the change trend of total nitrogen, nitrate nitrogen and ammonia nitrogen in the delay of the biological pool of the high-efficiency denitrification and dephosphorization system, and the trend is shown in figure 2. The biological pond is additionally provided with the pre-anoxic pond 2, the anoxic section of the biological pond is additionally provided with the internal reflux facility, the total nitrogen of the effluent of the biological pond can be reduced to about 15mg/l, which is reduced by more than 20 percent compared with the total nitrogen of the effluent of the original system, the adding amount of an external carbon source required by the subsequent denitrification is reduced, and the denitrification energy consumption of the system is reduced by 25 percent.
9) The change trend of the extended orthophosphate of the biological pond in the high-efficiency stable synchronous nitrogen and phosphorus removal device of the sewage treatment plant is shown in figure 3, 90% of raw water enters the anaerobic pond 3 after passing through the primary sedimentation pond 1, a carbon source is provided for biological phosphorus release, and the anaerobic pond 3 has obvious phosphorus release effect. The water outlet end of the biological pond is used for assisting chemical dephosphorization, and the water quality of the effluent is stable.
10 The efficient and stable synchronous nitrogen and phosphorus removal device (2018) of the sewage treatment plant is respectively shown in fig. 4 and 5 compared with the dephosphorization effect and the medicament dosing rate of the prior process (2016 and 2017). Compared with the prior sewage treatment system, the total phosphorus value of the effluent is reduced by more than 25%, and meanwhile, the biological phosphorus removal capacity of the system is enhanced due to the additionally arranged pre-anoxic tank 2.
The high-efficiency stable synchronous nitrogen and phosphorus removal device and method for the sewage treatment plant fully utilize carbon sources in sewage, enhance the denitrification effect of the system by adopting a sewage multipoint adding mode, reduce the total nitrogen of the effluent of the original system by more than 20%, reduce the adding amount of the additional carbon sources required by the subsequent denitrification, and reduce the denitrification energy consumption of the system by 25%; through the mode of multi-point adding of sewage, a strict anaerobic environment of the system is ensured, a good dephosphorization environment is provided for biological dephosphorization microorganisms, the total phosphorus of effluent is reduced by more than 25%, and meanwhile, the dephosphorization medicament is saved by more than 30%; fully mixing the excess sludge and the primary sludge in a primary sedimentation tank, biologically releasing phosphorus in a sludge layer, rapidly dehydrating to generate high-concentration phosphorus-containing filtrate, efficiently recovering by using the existing struvite method, strengthening the biological phosphorus removal effect, adding no or little chemical agent in a biological section, and simultaneously saving the agent and effectively recovering phosphorus resources; the system does not need the whole series of water cut-off in the transformation process, has little influence on production in the transformation process, small transformation engineering quantity, short construction period and stable water yielding up to the standard, and rapidly improves the water environment.
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 (4)
1. The utility model provides a synchronous nitrogen and phosphorus removal device of sewage treatment plant high efficiency stability which characterized in that includes: at least one primary sedimentation tank, a pre-anoxic tank, an anaerobic tank, an anoxic tank, at least one aerobic tank, a deoxidizing tank, a secondary sedimentation tank and a control unit;
the primary sedimentation tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the deoxidization tank are respectively provided with a water outlet pipe at the top, and the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the deoxidization tank and the secondary sedimentation tank are respectively communicated with each other in sequence through the water outlet pipes, wherein the water outlet pipe of the deoxidization tank is provided with a first flow control valve;
the sewage water inlet main pipeline is communicated with the primary sedimentation tank, and the sewage water inlet main pipeline is communicated with the bottom of the pre-anoxic tank through a second flow control valve and a third flow control valve;
The water outlet pipe of the primary sedimentation tank is provided with a fourth flow control valve, and the fourth flow control valve is respectively communicated with the bottoms of the anaerobic tank and the anoxic tank through a fifth flow control valve and a sixth flow control valve;
an ORP instrument is arranged in the anaerobic tank, and a first nitrate instrument and a second nitrate instrument are respectively arranged in the anoxic tank and the deoxidizing tank;
the first flow control valve, the second flow control valve, the third flow control valve, the fourth flow control valve, the fifth flow control valve, the sixth flow control valve, the ORP meter, the first nitrate meter and the second nitrate meter are respectively connected with the control unit;
the control unit controls the first flow control valve, the second flow control valve, the third flow control valve, the fourth flow control valve, the fifth flow control valve and the sixth flow control valve to perform flow control according to the measured values of the ORP meter, the first nitrate meter and the second nitrate meter respectively;
the device comprises a primary sedimentation tank, a secondary sedimentation tank, a control unit, a sludge dewatering unit, a sludge cake treatment unit, a phosphorus recovery unit, a residual sludge pump, a sludge dewatering unit, a sludge cake treatment unit, a phosphorus recovery unit and a water inlet end of the residual sludge pump, wherein the residual sludge pump is connected with the control unit; the sludge dewatering unit is connected with the mud cake treatment unit and is communicated with the bottom of the primary sedimentation tank through an eleventh flow control valve; the phosphorus recovery unit is connected with the sludge dewatering unit;
The internal reflux pump is connected with the control unit, the water inlet end of the internal reflux pump is communicated with the deoxidization pool through a seventh flow control valve, and the water outlet end of the internal reflux pump is communicated with the bottom of the anoxic pool; the external reflux pump is connected with the control unit, the water inlet end of the external reflux pump is communicated with the bottom of the secondary sedimentation tank through an eighth flow control valve, and the water outlet end of the external reflux pump is communicated with the pre-anoxic tank through a tenth flow control valve.
2. The efficient and stable synchronous nitrogen and phosphorus removal device for a sewage treatment plant according to claim 1, further comprising a blower, wherein the blower is connected with an aeration device arranged in the aerobic tank through a gas flow control valve.
3. The efficient and stable synchronous nitrogen and phosphorus removal device for the sewage treatment plant according to claim 1, wherein a stirring device is respectively arranged in the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the deoxidization tank, and a mud scraping device is arranged in the primary sedimentation tank.
4. A method for high-efficiency stable enhanced nitrogen and phosphorus removal of a sewage treatment plant, based on the high-efficiency stable synchronous nitrogen and phosphorus removal device of the sewage treatment plant as claimed in any one of claims 1 to 3, characterized in that the method comprises the following steps:
1) The control unit controls the second flow control valve and the fourth flow control valve to work at a set value based on the water quality and water quantity data collected in real time and the fourth flow control valve data, calculates the load of the primary sedimentation tank in real time through collecting the water quality and water quantity data and the fourth flow control valve flow in real time, analyzes the excess water quantity value according to an internal logic algorithm if the hydraulic load on the surface of the primary sedimentation tank exceeds the set value, and controls the second flow control valve and the third flow control valve on the water inlet branch pipe to be opened to the excess water quantity value so as to ensure that the water inlet load of the primary sedimentation tank is smaller than the set maximum value, thereby ensuring the efficient and stable work of the primary sedimentation tank, and recovering the operation of the systems according to the original set value when the load of the primary sedimentation tank is operated within the set value range;
2) The control unit controls the following systems to normally operate according to the set values, after the key parameters of the systems change the original set values, the control unit analyzes the related parameters in the systems in real time, and after the key parameters in the systems recover the original set values, the control unit controls the systems to recover the operation states of the original set values;
3) The control unit controls the fifth flow control valve and the sixth flow control valve to stably operate at the set values respectively, and distributes the other system flow along with the change of the system flow of one electric valve and the flowmeter, so that the sum of the flow values of the two is equal to the flow value of the fourth flow control valve;
4) The control unit monitors ORP meter data in real time, and if the ORP meter value runs within a set value range, the control unit controls the flow of the fifth flow control valve to be unchanged;
5) When the monitored value of the ORP meter is larger than the preset maximum value of ORP, the control unit controls the opening of the fifth flow control valve to be increased until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the opening of the fifth flow control valve reaches the preset maximum value of system, the state of the fifth flow control valve is kept unchanged and properly reduced until the monitored value of the ORP meter is smaller than the preset maximum value of ORP, if the monitored value of the ORP meter is still larger than the preset maximum value of ORP after the opening of the sixth flow control valve is reduced to the preset minimum value of system, the state of the sixth flow control valve is kept unchanged and the opening of the second flow control valve and the third flow control valve are properly increased, and when the monitored values of the opening of the second flow control valve and the third flow control valve are still larger than the preset maximum value of ORP, the states of the second flow control valve and the third flow control valve are kept unchanged, and the opening signals of the second flow control valve and the third flow control valve are input into the flow control unit in real time;
6) When the monitoring value of the ORP meter is smaller than the ORP preset minimum value, the control unit controls the opening of the fifth flow control valve to be reduced until the monitoring value of the ORP meter is larger than the ORP preset minimum value, if the opening of the fifth flow control valve is smaller than the system preset minimum value, the monitoring value of the ORP meter is still smaller than the ORP preset minimum value, the state of the fifth flow control valve is kept unchanged, the opening of the sixth flow control valve is properly increased until the monitoring value of the ORP meter is larger than the ORP preset minimum value, and if the opening of the sixth flow control valve is increased to the system preset maximum value, the monitoring value of the ORP meter is still smaller than the ORP preset minimum value, the state of the sixth flow control valve is kept unchanged, and the opening and flow signals of the control valves are transmitted to the control unit;
7) The control unit controls the sixth flow control valve to stably operate at a set flow value, and performs water quality analysis in real time and detects and monitors the data of the first nitrate meter; if the analysis results in insufficient carbon source in the inflow water, adding a proper amount of carbon source into the anoxic zone to perform denitrification; if the nitrate data value runs within the set value range under the condition that the carbon source in the water is sufficient or the carbon source in the water is insufficient but sufficient carbon source is added, the control unit controls the flow of the sixth flow control valve to be unchanged;
8) When the monitoring value of the first nitrate meter is larger than the preset maximum value of the first nitrate, the control unit analyzes the detection signal of the ORP meter and the opening and flow information of each control valve, and if the monitoring value of the ORP meter is still in a state larger than the preset maximum value of the ORP, the system keeps unchanged in the original state and transmits the opening and flow signals of each control valve to the control unit in real time; if the monitoring value of the ORP meter is smaller than the ORP preset minimum value state, the opening of the second flow control valve and the opening of the third flow control valve are properly increased, and when the monitoring value of the first nitrate meter is still larger than the first nitrate preset maximum value after the opening of the second flow control valve and the third flow control valve are increased to the preset maximum value, the states of the second flow control valve and the third flow control valve are kept unchanged, and the opening of each control valve and flow signals are transmitted to a control unit in real time; if the ORP meter monitoring value is between the preset minimum value and the maximum value, properly increasing the opening of the second flow control valve and the third flow control valve, keeping the ORP meter monitoring value between the preset minimum value and the maximum value by adjusting the opening of the fifth flow control valve and the sixth flow control valve, and when the monitoring value of the first nitrate meter is larger than the preset maximum value after the opening of the second flow control valve and the third flow control valve is increased to the preset maximum value, keeping the states of the second flow control valve and the third flow control valve unchanged and transmitting the opening and the flow signals of the control valves to a control unit;
9) When the data value of the first nitrate meter is smaller than the set minimum value, the control unit controls the flow of the sixth flow control valve to be reduced until the value is larger than the set minimum value, and if the flow of the sixth flow control valve is reduced to the system set minimum value and still does not meet the set value requirement, the state of the sixth flow control valve is maintained;
10 The control unit monitors the data of the second nitrate meter, the parameters of the seventh flow control valve and the parameters of the internal reflux pump in real time and controls the second nitrate meter to normally operate at a set value; dividing the seventh flow control valve flow value by the sum of the second flow control valve and the fourth flow control valve flow value to be the internal reflux ratio of the process system; when the value of the second nitrate meter is larger than the maximum set value, the control unit controls the flow of the internal reflux pump to gradually increase, and when the nitrate value of the effluent is still larger than the maximum set value after the internal reflux ratio is increased to the maximum set value, the control unit controls the flow of the internal reflux pump to be unchanged and carries out alarm prompt in the control unit;
11 The control unit monitors the data of the second nitrate meter, the parameters of the eighth flow control valve and the parameters of the external reflux pump in real time; dividing the tenth flow control valve flow value by the sum of the second flow control valve and the fourth flow control valve flow value to be the external reflux ratio of the process system; the control unit adjusts the flow of the external reflux pump to enable the external reflux ratio to run at a set value, when the value of the second nitrate meter is larger than a maximum set value and the internal reflux ratio is increased to the maximum set value of the system, the control unit controls the flow of the external reflux pump to be gradually increased, when the value of the external reflux ratio is increased to the maximum set value of the system, the nitrate value of the discharged water is still larger than the maximum set value, the control unit controls the flow of the external reflux pump to be unchanged, and alarm prompt is carried out in the control unit;
And (3) repeating the steps 1) to 11), and realizing the biological denitrification and dephosphorization treatment of the sewage by the high-efficiency stable synchronous denitrification and dephosphorization device of the sewage treatment plant.
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| CN111689660A (en) * | 2020-07-16 | 2020-09-22 | 北京城市排水集团有限责任公司 | Sewage treatment method and device |
| CN112939224B (en) * | 2021-02-01 | 2022-05-17 | 联合环境技术(天津)有限公司 | Method for adjusting biological nitrogen and phosphorus removal by using concentration gradient |
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