CN117658330A - Sewage dephosphorization device and method for strengthening biological coupling adsorption - Google Patents
Sewage dephosphorization device and method for strengthening biological coupling adsorption Download PDFInfo
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- CN117658330A CN117658330A CN202311752287.9A CN202311752287A CN117658330A CN 117658330 A CN117658330 A CN 117658330A CN 202311752287 A CN202311752287 A CN 202311752287A CN 117658330 A CN117658330 A CN 117658330A
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- 239000010865 sewage Substances 0.000 title claims abstract description 72
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000005728 strengthening Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 223
- 238000004062 sedimentation Methods 0.000 claims abstract description 84
- 239000000523 sample Substances 0.000 claims abstract description 75
- 238000012544 monitoring process Methods 0.000 claims abstract description 60
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 46
- 229910052760 oxygen Inorganic materials 0.000 claims description 46
- 239000001301 oxygen Substances 0.000 claims description 46
- 239000010802 sludge Substances 0.000 claims description 39
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 38
- 229910052698 phosphorus Inorganic materials 0.000 claims description 38
- 239000011574 phosphorus Substances 0.000 claims description 38
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 26
- 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 23
- 238000010992 reflux Methods 0.000 claims description 19
- 230000014759 maintenance of location Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000005273 aeration Methods 0.000 claims description 10
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- 239000002351 wastewater Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- QALQXPDXOWOWLD-UHFFFAOYSA-N [N][N+]([O-])=O Chemical compound [N][N+]([O-])=O QALQXPDXOWOWLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 239000003814 drug Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 11
- 238000011001 backwashing Methods 0.000 description 10
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000007900 aqueous suspension Substances 0.000 description 3
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- 235000015097 nutrients Nutrition 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000003403 water pollutant Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- -1 hydroxyl iron phosphorus Chemical compound 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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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
- C02F3/308—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
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage dephosphorization device and a dephosphorization method for strengthening biological coupling adsorption, which relate to the technical field of sewage treatment and comprise the following steps: the water outlet of the primary sedimentation tank is respectively connected with the pre-anoxic tank and the anaerobic tank, and the water outlet end of the pre-anoxic tank is connected with the anaerobic tank; the water inlet end of the anoxic tank is connected with the anaerobic tank, the water outlet end of the anoxic tank is connected with the aerobic tank, the water outlet end of the aerobic tank is respectively connected with the bottom of the anoxic tank and the sedimentation tank, and the bottom of the sedimentation tank is connected with the pre-anoxic tank; the water inlet end of the middle water tank is connected with the water outlet end of the sedimentation tank; the bottom of the dephosphorization filtering column is connected with the middle water tank, and the top of the dephosphorization filtering column is connected with the water producing tank; the on-line monitoring system is characterized in that probes are respectively arranged in a primary sedimentation water tank, a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank, an intermediate water tank and a water production tank in the biological treatment part tank; the automatic control system is connected with the online monitoring system; the dephosphorization method reduces the cost of the medicament and avoids secondary pollution on the basis of ensuring the dephosphorization effect.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage dephosphorization device and a dephosphorization method for strengthening biological coupling adsorption.
Background
In order to further improve the water environment quality, the total phosphorus emission standard of urban sewage treatment plants in key watershed and area in China is further improved. The water pollutant emission standard (DB 11/890-2012) A standard of the urban sewage treatment plant in Beijing city requires that the total phosphorus of the effluent be less than 0.2mg/L, the main water pollutant emission limit (DB 5301/T43-2020) A standard of the urban sewage treatment plant in Kunming city requires that the total phosphorus of the effluent be less than 0.05mg/L, 12 months in 2020, and the ecological environment department issues a middle eastern lake nutrient benchmark, wherein the total phosphorus benchmark is 0.029mg/L, although the total phosphorus emission standard is becoming strict, the phosphorus content in the effluent of the water plant is still higher for the water environment, and according to the U.S. lake nutrient level evaluation standard (EPA standard), the total phosphorus exceeds 0.02mg/L to reach the water eutrophication level to form algal bloom, so that research on efficient removal of phosphorus in sewage is needed, and the phosphorus content entering the water environment is further reduced.
In order to ensure that the effluent phosphorus reaches the standard in real time, the current dephosphorization mode of the sewage plant mainly uses chemical dephosphorization, the adding amount of the dephosphorization agent exceeds 2-5 times of the theoretical value, and excessive metal salt enters a front-end biological treatment system through sludge backflow, so that the activity of phosphorus accumulating bacteria is inhibited, and the biological dephosphorization effect is further weakened, so that the dephosphorization potential of the activated sludge system is fully utilized, the operation cost and the environmental influence are reduced, and meanwhile, the sewage plant still needs to mainly use biological dephosphorization in consideration of the requirements of energy conservation and consumption reduction, and the use of the dephosphorization agent is reduced or the dephosphorization process is changed. However, in consideration of the fact that biological phosphorus removal is greatly influenced by factors such as a water inlet carbon source, anaerobic environment and the like, an adsorption phosphorus removal process needs to be added after a biological phosphorus removal system so as to ensure the stability of phosphorus in water outlet.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the sewage dephosphorization device and the dephosphorization method for strengthening the biological coupling adsorption, wherein the phosphate in the sewage is removed by the biological coupling adsorption method, any dephosphorization reagent is not additionally added in the dephosphorization process, the reagent cost is reduced on the basis of ensuring the dephosphorization effect, and the secondary pollution of metal ions to the water environment is avoided.
In order to achieve the above object, the present invention provides a sewage dephosphorization apparatus for enhancing bio-coupling adsorption, comprising:
the water outlet of the primary sedimentation tank is respectively connected with the pre-anoxic tank and the anaerobic tank, and the water outlet end of the pre-anoxic tank is connected with the water inlet end of the anaerobic tank;
the anaerobic treatment device comprises an anaerobic tank, a sedimentation tank, a pre-anoxic tank, a water inlet end of the anaerobic tank, a water outlet end of the aerobic tank, a water inlet end of the anaerobic tank, a water outlet end of the anaerobic tank, a water inlet end of the anaerobic tank, a water outlet end of the aerobic tank, a water outlet end of the sedimentation tank, a water inlet end of the anaerobic tank and a water outlet end of the sedimentation tank, wherein the bottom of the sedimentation tank is respectively connected with the anaerobic tank, and the bottom of the sedimentation tank is connected with the pre-anoxic tank;
the water inlet end of the middle water tank is connected with the water outlet end of the sedimentation tank;
the bottom of the dephosphorization filtering column is connected with the water outlet end of the middle water tank, and the top of the dephosphorization filtering column is connected with the water producing tank;
the probe is respectively arranged in the primary sedimentation water tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the intermediate water tank and the water production tank;
and the automatic control system is connected with the online monitoring system.
Optionally, the on-line monitoring system includes a mud level detection probe and a first orthophosphate on-line monitoring probe which are arranged in the primary sedimentation tank, a first DO on-line monitoring probe which is arranged in the pre-anoxic tank, a second DO on-line monitoring probe and a first nitrate nitrogen probe which are arranged in the anaerobic tank, a third DO on-line monitoring probe and a second nitrate nitrogen probe which are arranged in the anoxic tank, a fourth DO on-line monitoring probe and a first SS probe which are arranged in the aerobic tank, a second SS probe and a second orthophosphate on-line monitoring probe which are arranged in the intermediate tank, and a third SS probe and a third orthophosphate on-line monitoring probe which are arranged in the water production tank.
Optionally, stirrers are respectively arranged in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank.
Optionally, the automatic control system includes:
the first water pump is arranged on the sewage pipe between the primary sedimentation water tank and the pre-anoxic tank;
the second water pump is arranged on the sewage pipe between the primary sedimentation water tank and the anaerobic tank;
the third water pump is arranged on the sewage pipe between the aerobic tank and the anoxic tank;
the fourth water pump is arranged on the sewage pipe between the middle water tank and the dephosphorization filtering column;
a fifth water pump arranged on the water pipe between the water producing tank and the dephosphorization filtering column;
the sludge pump is arranged on the sewage pipe between the sedimentation tank and the pre-anoxic tank.
The mud pump is arranged on the bottom outer drain pipe of the sedimentation tank;
optionally, the automatic control system further comprises an aeration pump arranged in the aerobic tank.
Optionally, a backwash water outlet of the water producing tank is connected with the bottom of the dephosphorization filter column.
Optionally, the dephosphorization filtration column comprises:
the filter column shell is internally provided with a supporting layer and a filter material layer from bottom to top in sequence;
the discharge opening is arranged at the bottom of the filter column shell, and the filter column shell is also provided with a sampling opening and a pressure gauge.
The invention also provides a sewage dephosphorization method for strengthening biological coupling adsorption, which comprises the following steps of:
10% -30% of sewage in the primary sedimentation tank enters a pre-anoxic tank, and 70% -90% of sewage enters an anaerobic tank;
the hydraulic retention time in the pre-anoxic tank is controlled to be 0.5 to 1h, and the dissolved oxygen is less than 0.5mg/L;
the hydraulic retention time in the anaerobic tank is controlled to be 1.5-2.5 h, the dissolved oxygen is less than 0.2mg/L, the nitrate nitrogen content of the inlet water is less than 0.5mg/L, and the stirrer stops 8-15min at intervals of 1h when being started;
the hydraulic retention time in the anoxic tank is controlled to be 2-4 h, the dissolved oxygen is less than 0.5mg/L, the nitrate nitrogen content in the inlet water is less than 10mg/L, and the internal reflux ratio is 250-350%;
the hydraulic retention time in the aerobic tank is controlled to be 4-6 h, the dissolved oxygen is less than 5mg/L, and the internal reflux ratio is 250% -350%;
the stirring speed of the sedimentation tank is controlled to be 5-15 r/min, and the internal reflux ratio is 90-110%;
the suspension in the intermediate tank was <10mg/L.
Optionally, the thickness of a sludge layer in the primary sedimentation tank is controlled to be 50% -65%, and the height of a filter material in the dephosphorization filter column is 60% -75%.
Optionally, the aerobic tank is divided into a front area, a middle area and a rear area, wherein the dissolved oxygen in the front area is controlled to be 3-5 mg/L, the dissolved oxygen in the middle area is controlled to be 2-3 mg/L, and the dissolved oxygen in the rear area is controlled to be 0-1 mg/L.
The invention provides a sewage dephosphorization device and a dephosphorization method for strengthening biological coupling adsorption, which have the beneficial effects that:
(1) The dephosphorization device can fully exert the biological dephosphorization potential of the sewage plant, improve the microbial activity, save 20% -30% of medicament compared with the traditional treatment method, and does not generate chemical sludge;
(2) The dephosphorization filter column in the dephosphorization device can realize the efficient deep removal of phosphorus, the orthophosphate of the yielding water is less than 0.02mg/L, the water quality reaches the surface III water, and the risk of water environment algal bloom can be obviously reduced;
(3) The method for removing phosphorus couples biological phosphorus removal with adsorption phosphorus removal for the first time, and realizes zero addition of the medicament when effluent reaches the limit low phosphorus concentration;
(4) The dephosphorization method has high automation degree and simple and convenient operation, and can be applied to upgrading and reconstruction of newly-built or reconstructed sewage plants and regenerated water plants.
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 structural diagram of a sewage dephosphorization apparatus with enhanced bio-coupling adsorption according to an embodiment of the present invention.
Fig. 2 shows a graph of the change in water phosphate in and out of a wastewater dephosphorization apparatus with enhanced bio-coupling adsorption according to an embodiment of the invention.
Fig. 3 shows a graph of the variation of the water inlet and outlet suspended solids of a wastewater dephosphorization apparatus with enhanced bio-coupling adsorption 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 sedimentation tank; 7. an intermediate water tank; 8. a dephosphorization filter column; 9. a water producing tank; 10. a mud level detection probe; 11. a first orthophosphate online monitoring probe; 12. a second orthophosphate online monitoring probe; 13. a third orthophosphate online monitoring probe; 14. a first DO online monitoring probe; 15. a second DO online monitoring probe; 16. a third DO online monitoring probe; 17. a fourth DO online monitoring probe; 18. a first nitrate nitrogen probe; 19. a second nitrate nitrogen probe; 20. a first SS probe; 21. a second SS probe; 22. a third SS probe; 23. a stirrer; 24. a first water pump; 25. a second water pump; 26. a third water pump; 27. a fourth water pump; 28. a fifth water pump; 29. a sludge pump; 30. a mud pump; 31. and (5) an aeration pump.
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 sewage dephosphorization device for strengthening biological coupling adsorption, which comprises:
the water outlet of the primary sedimentation tank is respectively connected with the pre-anoxic tank and the anaerobic tank, and the water outlet end of the pre-anoxic tank is connected with the water inlet end of the anaerobic tank;
the water inlet end of the anoxic tank is connected with the water outlet end of the anaerobic tank, the water outlet end of the anoxic tank is connected with the water inlet end of the aerobic tank, the water outlet end of the aerobic tank is respectively connected with the bottom of the anoxic tank and the sedimentation tank, and the bottom of the sedimentation tank is connected with the pre-anoxic tank;
the water inlet end of the middle water tank is connected with the water outlet end of the sedimentation tank;
the bottom of the dephosphorization filtering column is connected with the water outlet end of the middle water tank, and the top of the dephosphorization filtering column is connected with the water producing tank;
the on-line monitoring system is characterized in that probes are respectively arranged in the primary sedimentation water tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the intermediate water tank and the water production tank;
and the automatic control system is connected with the on-line monitoring system.
Specifically, the dephosphorization device comprises two parts of a biological treatment module and a materialization treatment module, wherein the biological treatment method is an activated sludge process, the process is an improved AAO process, and the biological treatment device comprises a primary sedimentation tank, a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a stirring device, an aeration device, an online monitoring system and an automatic control system; the physical and chemical treatment method is that the dephosphorization filter material is adsorbed and filtered, and the treatment device comprises an intermediate water tank, a dephosphorization filter column, a water production tank for backwashing, an online monitoring system and an automatic control system.
The dephosphorization device is characterized in that a water inlet and a sludge outlet are formed in a primary sedimentation tank, sewage enters the primary sedimentation tank through a pipeline, sludge exists in the primary sedimentation tank, organic matters (VFAs) are produced by anaerobic fermentation of the sludge, a carbon source of a subsequent anaerobic tank is supplemented, biological dephosphorization is enhanced, a tee joint is arranged at a water outlet of the primary sedimentation tank, the sewage is split by the tee joint, one part of sewage enters a pre-anoxic tank, and the other part of sewage enters the anaerobic tank; the sewage with the primary sedimentation tank is discharged into the pre-anoxic tank, and the activated sludge pumped by the sedimentation tank is mixed with the sewage to remove nitrate nitrogen and dissolved oxygen in the sludge, so that the defect of a transmission AAO process is overcome, the influence on the subsequent biological anaerobic phosphorus release is reduced, and the biological phosphorus removal effect is enhanced; the pre-anoxic tank is communicated with the anaerobic tank, the activated sludge flowing in from the pre-anoxic tank is mixed with the sewage flowing in from the primary sedimentation tank, and an anaerobic phosphorus release process occurs, so that the hydrolysis of polyphosphate and the synthesis of cell energy storage substance PHB are realized, and the biological phosphorus removal effect is enhanced; the anoxic tank is communicated with the anaerobic tank, and also receives activated sludge pumped by the aerobic tank, and the content of nitrate nitrogen and dissolved oxygen in water entering the anoxic tank are changed by adjusting the internal reflux ratio, so that denitrification, denitrification and dephosphorization are realized; the aerobic tank is communicated with the anoxic tank, an aerobic phosphorus absorption reaction mainly occurs in the aerobic tank, sludge at the tail end of the aerobic tank can flow back to the water inlet end of the anoxic tank through the water pump for denitrification and dephosphorization of the anoxic tank, and the influence of the reflux at the tail end of the aerobic tank on denitrification and dephosphorization of the anoxic tank is reduced; the sewage in the aerobic tank enters a sedimentation tank for mud-water separation to remove granular phosphorus, supernatant fluid in the sedimentation tank flows into an intermediate water tank through gravity without additionally adding a water pump, a part of sediment sludge at the bottom of the sedimentation tank flows back into a pre-anoxic tank to supplement activated sludge required by the whole biological tank, and the rest sludge is discharged through a sludge discharge pump; the supernatant in the sedimentation tank is discharged into an intermediate water tank, further sedimentation is realized in the intermediate water tank, suspended matters entering the dephosphorization filter column are placed too high, the upper part of the intermediate water tank is connected with a water outlet of the sedimentation tank, the middle part of the intermediate water tank is connected with a water inlet of the dephosphorization filter column through a water pump, a drain opening is arranged at the bottom of the intermediate water tank, and when the suspended matters are higher than a set value, the drain opening can be opened to discharge settled particles; the process of lower inlet and upper outlet is carried out in the dephosphorization filter column, so that the influence of air resistance can be avoided; the water producing tank is connected with the top of the dephosphorization filter column and is used for storing the effluent of the dephosphorization filter column, meanwhile, the water of the water producing tank is also used as backwash water of the dephosphorization filter column, and a drain hole is also formed in the bottom of the water producing tank and is used for draining periodically, so that the influence of impurity accumulation on the quality of backwash water is avoided. The online monitoring system mainly comprises an online monitoring probe for orthophosphate, dissolved oxygen, nitrate nitrogen and suspended matters, a signal transmission module, a display screen and the like, wherein the online monitoring probe for orthophosphate is distributed in the primary sedimentation water tank, the middle water tank and the water production tank and is used for monitoring the dephosphorization effect of the biological treatment device and the dephosphorization filter column; the dissolved oxygen on-line monitoring probes are distributed in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank and are used for monitoring the change of the dissolved oxygen in the biological tank in real time; the nitrate nitrogen probes are distributed in the anaerobic tank and the anoxic tank and are used for monitoring the change of the nitrate nitrogen concentration, so that the internal reflux ratio can be adjusted in time; the suspended matter probe is positioned in the aerobic tank, the middle water tank and the water producing tank and is used for monitoring the sludge concentration and dissolved oxygen change in the tank, so that the sludge discharge and the backwashing of the filter column can be adjusted in time; the automatic control system is connected with the on-line monitoring system, the aeration pump, the water pump, the sludge pump and the dephosphorization filter column backwashing system and is used for realizing the real-time adjustment of dissolved oxygen, automatic sludge discharge and flow control of the biological treatment system and controlling the flow and backwashing time of filter column backwashing water and backwashing gas.
Optionally, the on-line monitoring system includes a mud level detection probe and a first orthophosphate on-line monitoring probe disposed in the primary settling tank, a first DO on-line monitoring probe disposed in the pre-anoxic tank, a second DO on-line monitoring probe and a first nitronitrogen probe disposed in the anaerobic tank, a third DO on-line monitoring probe and a second nitronitrogen probe disposed in the anoxic tank, a fourth DO on-line monitoring probe and a first SS probe disposed in the aerobic tank, a second SS probe and a second orthophosphate on-line monitoring probe disposed in the intermediate tank, and a third SS probe and a third orthophosphate on-line monitoring probe disposed in the water production tank.
Specifically, the thickness of a sludge layer and the index of dissolved oxygen in the primary sedimentation tank are required to be controlled, the thickness of the sludge in the primary sedimentation tank is controlled to be 50% -65%, and when the thickness is too high, a sludge discharge valve of the tank is required to be opened; the dissolved oxygen is required to be controlled in the pre-anoxic tank, so that the dissolved oxygen is ensured to be less than 0.5mg/L; controlling indexes of dissolved oxygen and nitrate nitrogen in an anaerobic tank to enable the dissolved oxygen to be smaller than 0.2mg/L and the nitrate nitrogen to be smaller than 0.5mg/L; the indexes of dissolved oxygen and nitrate nitrogen are controlled in the anoxic tank, so that the dissolved oxygen is less than 0.5mg/L and the nitrate nitrogen is less than 10mg/L; performing zone control on dissolved oxygen indexes in an aerobic tank; the intermediate and product tanks require control of suspended and orthophosphate indicators.
Optionally, stirrers are respectively arranged in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank.
Specifically, a variable-frequency stirrer is arranged in the biological treatment part tank and used for ensuring uniform mixing of muddy water, the rotating speed of the stirrer is adjustable within the range of 150-300 r/min, the stirring speed is not too fast, liquid splashing is prevented, meanwhile, the stirring speed is not too slow, and muddy water layering is prevented.
Optionally, the automatic control system comprises:
the first water pump is arranged on the sewage pipe between the primary sedimentation water tank and the pre-anoxic tank;
the second water pump is arranged on the sewage pipe between the primary sedimentation water tank and the anaerobic tank;
the third water pump is arranged on the sewage pipe between the aerobic tank and the anoxic tank;
the fourth water pump is arranged on the sewage pipe between the middle water tank and the dephosphorization filtering column;
the fifth water pump is arranged on the water pipe between the water producing tank and the dephosphorization filtering column;
the sludge pump is arranged on the sewage pipe between the sedimentation tank and the pre-anoxic tank.
The mud pump is arranged on the bottom outer drain pipe of the sedimentation tank;
optionally, the automatic control system further comprises an aeration pump arranged in the aerobic tank.
Specifically, an aeration pump, a water pump and a sludge pump are arranged for realizing the real-time regulation of dissolved oxygen, automatic sludge discharge and flow control of a biological treatment system, and simultaneously controlling the flow and backwash time of backwash water and backwash gas of a dephosphorization filter column.
Optionally, a backwash water outlet of the water producing tank is connected with the bottom of the dephosphorization filter column.
Optionally, the dephosphorization filtration column comprises:
the filter column shell is internally provided with a supporting layer and a filter material layer from bottom to top in sequence;
the discharge opening is arranged at the bottom of the filter column shell, and the filter column shell is also provided with a sampling opening and a pressure gauge.
Specifically, as the dephosphorization filter column is of a structure of lower inlet and upper outlet, after the water filtered in the dephosphorization filter column enters the water production tank, the water can be sent back to the dephosphorization filter column again through the back flushing water outlet, and thus the water sent back can realize the cleaning of the dephosphorization filter column; the filtering effect of the phosphorus filtering column can be relieved in real time through the sampling port and the pressure gauge, and accumulated impurities can be discharged through the discharge port, so that the quality of backwash water is guaranteed.
In one embodiment, the supporting layer adopts a filter brick or a stainless steel filter screen, and the lower part of the dephosphorization filter column is provided with a pressure gauge for monitoring the pressure in the filter column shell in real time.
The invention also provides a sewage dephosphorization method for strengthening biological coupling adsorption, which comprises the following steps of:
10% -30% of sewage in the primary sedimentation tank enters a pre-anoxic tank, and 70% -90% of sewage enters an anaerobic tank;
the hydraulic retention time in the pre-anoxic tank is controlled to be 0.5 to 1h, and the dissolved oxygen is less than 0.5mg/L;
the hydraulic retention time in the anaerobic tank is controlled to be 1.5-2.5 h, the dissolved oxygen is less than 0.2mg/L, the nitrate nitrogen content of the inlet water is less than 0.5mg/L, and the stirrer stops 8-15min at intervals of 1h when being started;
the hydraulic retention time in the anoxic tank is controlled to be 2-4 h, the dissolved oxygen is less than 0.5mg/L, the nitrate nitrogen content in the inlet water is less than 10mg/L, and the internal reflux ratio is 250-350%;
the hydraulic retention time in the aerobic tank is controlled to be 4-6 h, the dissolved oxygen is less than 5mg/L, and the internal reflux ratio is 250% -350%;
the stirring speed of the sedimentation tank is controlled to be 5-15 r/min, and the internal reflux ratio is 90-110%;
the suspension in the intermediate tank was <10mg/L.
Optionally, the thickness of a sludge layer in the primary sedimentation tank is controlled to be 50% -65%, and the height of a filter material in the dephosphorization filter column is 60% -75%, so that the influence of air resistance is avoided.
Optionally, the aerobic tank is divided into a front area, a middle area and a rear area, wherein the dissolved oxygen in the front area is controlled to be 3-5 mg/L, the dissolved oxygen in the middle area is controlled to be 2-3 mg/L, and the dissolved oxygen in the rear area is controlled to be 0-1 mg/L.
Specifically, the primary sedimentation tank divides sewage through a tee joint, wherein 10% -30% of sewage enters a pre-anoxic tank through a variable frequency water pump, 70% -90% of sewage enters an anaerobic tank, and accurate distribution of a water inlet carbon source is realized; setting a stirrer in the anaerobic tank, increasing the phosphorus release time of the anaerobic tank through starting and stopping the stirrer, and solving the problem of insufficient residence time of the anaerobic tank of the sewage plant, strengthening biological phosphorus removal, controlling the stirrer to intermittently stop for 8-15min every 1h when the stirrer is started, and then starting continuously and repeating the steps; the aerobic tank is divided into a front area, a middle area and a rear area, the dissolved oxygen in each area is distributed in a gradient manner, the influence of the reflux at the tail end of the aerobic tank on denitrification and dephosphorization of the anoxic tank is reduced, and the flow of the dissolved oxygen through an aeration pump is automatically regulated; the stirrer in the sedimentation tank is used for accelerating the sedimentation of the sludge, ensuring the uniform sludge discharge concentration, controlling the stirring speed within the range of 5-15 r/min, and automatically regulating the sludge discharge amount of the sedimentation tank through the sludge concentration of the aerobic tank; the intermediate water tank is required to monitor suspended matters, when the suspended matters are higher than 10mg/L, a bottom emptying port is required to be opened, and settled particulate matters in the intermediate water tank are discharged, so that the suspended matters are reduced.
Examples
As shown in fig. 1 to 3, the present invention provides a sewage dephosphorization apparatus for enhancing bio-coupling adsorption, comprising:
the water outlet of the primary sedimentation tank 1 is respectively connected with the pre-anoxic tank 2 and the anaerobic tank 3, and the water outlet end of the pre-anoxic tank 2 is connected with the water inlet end of the anaerobic tank 3;
the water inlet end of the anoxic tank 4 is connected with the water outlet end of the anaerobic tank 3, the water outlet end of the anoxic tank 4 is connected with the water inlet end of the aerobic tank 5, the water outlet end of the aerobic tank 5 is respectively connected with the bottom of the anoxic tank 4 and the sedimentation tank 6, and the bottom of the sedimentation tank 6 is connected with the pre-anoxic tank 2;
the water inlet end of the middle water tank 7 is connected with the water outlet end of the sedimentation tank 6;
the bottom of the dephosphorization filtering column 8 is connected with the water outlet end of the middle water tank 7, and the top of the dephosphorization filtering column 8 is connected with the water producing tank 9;
the on-line monitoring system is characterized in that probes are respectively arranged in the primary sedimentation tank 1, the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, the aerobic tank 5, the intermediate tank 7 and the water production tank 9;
and the automatic control system is connected with the on-line monitoring system.
In the present embodiment, the on-line monitoring system includes a mud level detection probe 10 and a first orthophosphate on-line monitoring probe 11 provided in the preliminary sedimentation tank 1, a first DO on-line monitoring probe 14 provided in the pre-anoxic tank 2, a second DO on-line monitoring probe 15 and a first nitrate nitrogen probe 18 provided in the anaerobic tank 3, a third DO on-line monitoring probe 16 and a second nitrate nitrogen probe 19 provided in the anoxic tank 4, a fourth DO on-line monitoring probe 17 and a first SS probe 20 provided in the aerobic tank 5, a second SS probe 21 and a second orthophosphate on-line monitoring probe 12 provided in the intermediate tank 7, a third SS probe 22 and a third orthophosphate on-line monitoring probe 13 provided in the water production tank 9.
In the present embodiment, agitators 23 are provided in the pre-anoxic tank 2, the anaerobic tank 3, the anoxic tank 4, and the aerobic tank 5, respectively.
In this embodiment, the automatic control system includes:
a first water pump 24 disposed on the sewage pipe between the primary settling tank 1 and the pre-anoxic tank 2;
a second water pump 25 provided on the sewage pipe between the primary sedimentation tank 1 and the anaerobic tank 3;
a third water pump 26 arranged on the sewage pipe between the aerobic tank 5 and the anoxic tank 4;
a fourth water pump 27 arranged on the sewage pipe between the intermediate water tank 7 and the dephosphorization filter column 8;
a fifth water pump 28 arranged on the water pipe between the water producing tank 9 and the dephosphorization filtering column 8;
a sludge pump 29 is provided on the sewage pipe between the sedimentation tank 6 and the pre-anoxic tank 2.
A sludge pump 30 arranged on the bottom outer drain pipe of the sedimentation tank 6;
in this embodiment, the automatic control system further includes an aeration pump 31 provided in the aerobic tank 5.
In the embodiment, a backwash water outlet of the water producing tank 9 is connected with the bottom of the dephosphorization filter column 8.
In this embodiment, the dephosphorization filtration column 8 comprises:
the filter column shell is internally provided with a supporting layer and a filter material layer from bottom to top in sequence;
the discharge opening is arranged at the bottom of the filter column shell, and the filter column shell is also provided with a sampling opening and a pressure gauge.
The invention also provides a sewage dephosphorization method for strengthening biological coupling adsorption, which comprises the following steps of:
10% -30% of sewage in the primary sedimentation tank 1 enters the pre-anoxic tank 2, and 70% -90% of sewage enters the anaerobic tank 3;
the hydraulic retention time in the pre-anoxic tank 2 is controlled to be 0.5-1 h, and the dissolved oxygen is less than 0.5mg/L;
the water retention time in the anaerobic tank 3 is controlled to be 1.5-2.5 h, the dissolved oxygen is less than 0.2mg/L, the nitrate nitrogen content of the inlet water is less than 0.5mg/L, and the stirrer stops 8-15min at intervals of 1h when being started;
the retention time of the water force in the anoxic tank 4 is controlled to be 2-4 h, the dissolved oxygen is less than 0.5mg/L, the nitrate nitrogen content of the inlet water is less than 10mg/L, and the internal reflux ratio is 250-350%;
the water retention time in the aerobic tank 5 is controlled to be 4-6 h, the dissolved oxygen is less than 5mg/L, and the internal reflux ratio is 250% -350%;
the stirring speed of the sedimentation tank 6 is controlled to be 5-15 r/min, and the internal reflux ratio is 90-110%;
the suspension in the intermediate tank 7 is <10mg/L.
In the embodiment, the thickness of a sludge layer in the primary sedimentation tank 1 is controlled to be 50% -65%, and the height of a filter material in the dephosphorization filter column 8 accounts for 60% -75%.
In the embodiment, the aerobic tank 5 is divided into a front zone, a middle zone and a rear zone, wherein the dissolved oxygen in the front zone is controlled to be 3-5 mg/L, the dissolved oxygen in the middle zone is controlled to be 2-3 mg/L, and the dissolved oxygen in the rear zone is controlled to be 0-1 mg/L.
In conclusion, the sewage dephosphorization device is applied to a sewage treatment plant, actual inflow water is used as a water source for strengthening the biological coupling adsorption dephosphorization device, the authenticity of test data is ensured, continuous inflow water is adopted in the device, and the dephosphorization effect of the device is monitored in real time; the effective volume of the biological treatment device is 360L, the biological treatment device consists of a pre-anoxic tank 2, an anaerobic tank 3, an anoxic tank 4 and an aerobic tank 5, the volume ratio of each process section is 1:2:2:5, sectional water inflow is adopted, the water inflow is 1m3/d,30% of raw water enters the pre-anoxic tank 2, 70% of raw water enters the anaerobic tank 3, each grid of reaction tank contains a stirrer 23, the hydraulic retention time of the device is 10h, the mud age is 16d, the internal reflux ratio is 250%, the external reflux ratio is 100%, and the aeration quantity, the reflux ratio and the mud discharge are automatically regulated by an automatic control system; the whole phosphorus removal filter column with the adsorption function is 1.5m high, the diameter of a filter column shell is 15cm, the upper part of a supporting layer is 1.2m high, an independently developed PARMTM hydroxyl iron phosphorus removal filter material is used, the filling height is 0.8m, the saturated adsorption capacity of phosphate of the filter material is 25mg/g, the empty bed residence time (EBCT) of the filter column is 20min, the normal operation pool pressure is 8kPa, when the pool pressure is increased to 12kPa or the water suspension of the filter column is increased to 3mg/L, an automatic control system starts a backwashing program, a three-step backwashing method of air washing, air washing and water washing is adopted, the backwashing time is 40min, the water phosphate can be reduced to below 0.02mg/L after backwashing, and the suspended matters are less than 1mg/L; and (3) monitoring phosphate data in real time in the running process of the whole device, drawing a curve by taking a 24-hour mean value, and analyzing the continuous running effect. The result of continuous operation for 30 days shows that under the condition that the inlet orthophosphate is 3.7mg/L, the outlet water of the biological treatment system is about 0.4mg/L, the stability of the outlet orthophosphate of the filter column is less than 0.05mg/L, the dephosphorization efficiency is as high as 99%, and under the condition that the inlet water suspension of the filter column is about 25mg/L, the outlet water suspension can achieve <1mg/L, the specific data are shown in figures 2 and 3, the device is stable in operation, the backwashing frequency of the filter column is lower, about 1 time/week, and the energy consumption is greatly reduced.
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 (10)
1. A sewage dephosphorization device for strengthening biological coupling adsorption, which is characterized by comprising:
the water outlet of the primary sedimentation tank is respectively connected with the pre-anoxic tank and the anaerobic tank, and the water outlet end of the pre-anoxic tank is connected with the water inlet end of the anaerobic tank;
the anaerobic treatment device comprises an anaerobic tank, a sedimentation tank, a pre-anoxic tank, a water inlet end of the anaerobic tank, a water outlet end of the aerobic tank, a water inlet end of the anaerobic tank, a water outlet end of the anaerobic tank, a water inlet end of the anaerobic tank, a water outlet end of the aerobic tank, a water outlet end of the sedimentation tank, a water inlet end of the anaerobic tank and a water outlet end of the sedimentation tank, wherein the bottom of the sedimentation tank is respectively connected with the anaerobic tank, and the bottom of the sedimentation tank is connected with the pre-anoxic tank;
the water inlet end of the middle water tank is connected with the water outlet end of the sedimentation tank;
the bottom of the dephosphorization filtering column is connected with the water outlet end of the middle water tank, and the top of the dephosphorization filtering column is connected with the water producing tank;
the probe is respectively arranged in the primary sedimentation water tank, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank, the intermediate water tank and the water production tank;
and the automatic control system is connected with the online monitoring system.
2. The enhanced bio-coupled adsorption wastewater dephosphorization apparatus of claim 1, wherein the on-line monitoring system comprises a mud level detection probe and a first orthophosphate on-line monitoring probe disposed in the primary settling tank, a first DO on-line monitoring probe disposed in the pre-anoxic tank, a second DO on-line monitoring probe and a first nitronitrogen probe disposed in the anaerobic tank, a third DO on-line monitoring probe and a second nitronitrogen probe disposed in the anoxic tank, a fourth DO on-line monitoring probe and a first SS probe disposed in the aerobic tank, a second SS probe and a second orthophosphate on-line monitoring probe disposed in the intermediate tank, and a third SS probe and a third orthophosphate on-line monitoring probe disposed in the water production tank.
3. The apparatus for removing phosphorus from sewage by enhanced bio-coupling adsorption according to claim 1, wherein agitators are provided in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank, respectively.
4. The enhanced bio-coupled adsorption wastewater dephosphorization apparatus of claim 1, wherein said automated control system comprises:
the first water pump is arranged on the sewage pipe between the primary sedimentation water tank and the pre-anoxic tank;
the second water pump is arranged on the sewage pipe between the primary sedimentation water tank and the anaerobic tank;
the third water pump is arranged on the sewage pipe between the aerobic tank and the anoxic tank;
the fourth water pump is arranged on the sewage pipe between the middle water tank and the dephosphorization filtering column;
a fifth water pump arranged on the water pipe between the water producing tank and the dephosphorization filtering column;
the sludge pump is arranged on the sewage pipe between the sedimentation tank and the pre-anoxic tank.
The mud pump is arranged on the bottom outer drain pipe of the sedimentation tank.
5. The enhanced bio-coupled adsorption wastewater dephosphorization apparatus of claim 1, wherein said automated control system further comprises an aeration pump disposed in said aerobic tank.
6. The apparatus for removing phosphorus from wastewater by enhanced bio-coupling adsorption according to claim 1, wherein a backwash water outlet of the water producing tank is connected to a bottom of the phosphorus removal filter column.
7. The enhanced bio-coupled adsorption wastewater dephosphorization apparatus of claim 1, wherein the dephosphorization filtration column comprises:
the filter column shell is internally provided with a supporting layer and a filter material layer from bottom to top in sequence;
the discharge opening is arranged at the bottom of the filter column shell, and the filter column shell is also provided with a sampling opening and a pressure gauge.
8. A method for removing phosphorus from sewage by enhanced bio-coupling adsorption, using the apparatus for removing phosphorus from sewage by enhanced bio-coupling adsorption according to any one of claims 1 to 7, comprising:
10% -30% of sewage in the primary sedimentation tank enters a pre-anoxic tank, and 70% -90% of sewage enters an anaerobic tank;
the hydraulic retention time in the pre-anoxic tank is controlled to be 0.5 to 1h, and the dissolved oxygen is less than 0.5mg/L;
the hydraulic retention time in the anaerobic tank is controlled to be 1.5-2.5 h, the dissolved oxygen is less than 0.2mg/L, the nitrate nitrogen content of the inlet water is less than 0.5mg/L, and the stirrer stops 8-15min at intervals of 1h when being started;
the hydraulic retention time in the anoxic tank is controlled to be 2-4 h, the dissolved oxygen is less than 0.5mg/L, the nitrate nitrogen content in the inlet water is less than 10mg/L, and the internal reflux ratio is 250-350%;
the hydraulic retention time in the aerobic tank is controlled to be 4-6 h, the dissolved oxygen is less than 5mg/L, and the internal reflux ratio is 250% -350%;
the stirring speed of the sedimentation tank is controlled to be 5-15 r/min, and the internal reflux ratio is 90-110%;
the suspension in the intermediate tank was <10mg/L.
9. The method for removing phosphorus from sewage by intensified biological coupling adsorption according to claim 8, wherein the thickness of the sludge layer in the primary sedimentation tank is controlled to be 50% -65%, and the height of the filter material in the phosphorus removal filter column is 60% -75%.
10. The method for removing phosphorus from sewage by enhanced bio-coupling adsorption according to claim 8, wherein the aerobic tank is divided into a front zone, a middle zone and a rear zone, the dissolved oxygen in the front zone is controlled to be 3-5 mg/L, the dissolved oxygen in the middle zone is controlled to be 2-3 mg/L, and the dissolved oxygen in the rear zone is controlled to be 0-1 mg/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082492A (en) * | 2017-04-27 | 2017-08-22 | 东南大学 | A kind of low consumption continuous stream domestic sewage treatment reactor and nitrogen phosphorus efficiency minimizing technology |
| CN111925077A (en) * | 2020-09-09 | 2020-11-13 | 北京涞澈科技发展有限公司 | Distributed domestic sewage integrated treatment system and process |
| CN115057534A (en) * | 2022-07-27 | 2022-09-16 | 中国市政工程华北设计研究总院有限公司 | Low-carbon sewage nitrogen and phosphorus removal system and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082492A (en) * | 2017-04-27 | 2017-08-22 | 东南大学 | A kind of low consumption continuous stream domestic sewage treatment reactor and nitrogen phosphorus efficiency minimizing technology |
| CN111925077A (en) * | 2020-09-09 | 2020-11-13 | 北京涞澈科技发展有限公司 | Distributed domestic sewage integrated treatment system and process |
| CN115057534A (en) * | 2022-07-27 | 2022-09-16 | 中国市政工程华北设计研究总院有限公司 | Low-carbon sewage nitrogen and phosphorus removal system and process |
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