CN113860653A - Sewage treatment system and process utilizing filamentous fungi and controlling sludge bulking - Google Patents
Sewage treatment system and process utilizing filamentous fungi and controlling sludge bulking Download PDFInfo
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- CN113860653A CN113860653A CN202111256637.3A CN202111256637A CN113860653A CN 113860653 A CN113860653 A CN 113860653A CN 202111256637 A CN202111256637 A CN 202111256637A CN 113860653 A CN113860653 A CN 113860653A
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- 239000010865 sewage Substances 0.000 title claims abstract description 99
- 239000010802 sludge Substances 0.000 title claims abstract description 77
- 241000233866 Fungi Species 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000926 separation method Methods 0.000 claims abstract description 34
- 241000894006 Bacteria Species 0.000 claims abstract description 28
- 238000007872 degassing Methods 0.000 claims abstract description 28
- 238000005188 flotation Methods 0.000 claims abstract description 14
- 239000012528 membrane Substances 0.000 claims description 32
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052698 phosphorus Inorganic materials 0.000 claims description 24
- 239000011574 phosphorus Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 229910001868 water Inorganic materials 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 14
- 229910019142 PO4 Inorganic materials 0.000 claims description 14
- 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 14
- 239000010452 phosphate Substances 0.000 claims description 14
- 244000005700 microbiome Species 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 9
- 238000000108 ultra-filtration Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 230000000593 degrading effect Effects 0.000 claims description 7
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
- 229930195729 fatty acid Natural products 0.000 claims description 7
- 239000000194 fatty acid Substances 0.000 claims description 7
- 150000004665 fatty acids Chemical class 0.000 claims description 7
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 238000005276 aerator Methods 0.000 claims description 4
- 238000005374 membrane filtration Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
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- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
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- Life Sciences & Earth Sciences (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)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a sewage treatment system utilizing filamentous bacteria and controlling sludge bulking, which comprises a grating, an air flotation tank, a sludge-film mixed biological tank and a film separation system which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank, an anaerobic tank, an anoxic tank and an aerobic tank; its preparing process is also disclosed. The sewage treatment system of the invention coordinates physicochemical treatment and biological decomposition, utilizes the filamentous fungi to treat the sewage, controls the filamentous fungi in a good state, avoids sludge bulking damage caused by excessive propagation of the filamentous fungi, utilizes the degradation advantage of the filamentous fungi on pollutants, improves the treatment efficiency of each link, improves the effluent quality and the operation stability of a sewage plant, saves energy and reduces consumption.
Description
Technical Field
The invention relates to the technical field of sewage purification, in particular to a sewage treatment system and process utilizing filamentous bacteria and controlling sludge bulking.
Background
Sewage treatment plants in cold regions of China often have dry and rainless climate in winter, residents like to eat meat, and the cultivation slaughtering industry is developed. Therefore, the urban sewage generally has the characteristics of high pollutant concentration, high content of fatty substances, low water inlet temperature and the like, and the long retention time and the low reaction rate often result in too low load of the inlet water sludge in the operation of sewage plants. Sludge bulking is generally caused by filamentous bacteria, so that the sludge quality becomes light, the sludge bulking and the settling property are deteriorated, the SVI value is continuously increased, the sludge bulking is too poor in settling property to a certain degree, the secondary sedimentation tank cannot effectively separate sludge from water, and if control measures are not taken, the continuous loss of the sludge can sharply reduce the number of microorganisms in the aeration tank and cannot meet the normal requirement of decomposing organic pollutants, so that the performance of the whole system is reduced, and even the system is collapsed. Therefore, the sewage plant has the conditions of low biochemical efficiency, poor sludge settleability caused by filamentous bacterium expansion, system collapse and the like during winter operation. The current common solutions are: adding drugs to enhance the sludge sedimentation performance or directly killing filamentous fungi; inhibiting or eliminating excessive propagation of filamentous bacteria by changing the growth environment of microorganisms in the biochemical pond; the pH value, the nitrogen and phosphorus content, the dissolved oxygen content and the like are controlled, and the main purpose is to inhibit or even eliminate filamentous fungi. But the filamentous fungi are propagated in a biochemical system in a large quantity, so that the utilization rate of removing various pollutants can be improved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a municipal sewage treatment system and process suitable for cold regions, which control the sludge expansion degree, avoid the sludge expansion damage, improve the biochemical treatment efficiency by using filamentous bacteria, improve the effluent quality and the operation stability, save energy and reduce consumption.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a sewage treatment system utilizing filamentous bacteria and controlling sludge bulking comprises a grating, an air flotation tank, a sludge-film mixed biological tank and a membrane separation system which are sequentially connected; the sludge-film mixed biological pool comprises a degassing pool, an anaerobic pool, an anoxic pool and an aerobic pool. The membrane separation system can adapt to the condition of higher expansion degree of the filamentous fungi and replace a sedimentation tank in other process schemes.
The sewage treatment system utilizing the filamentous fungi and controlling the sludge expansion is characterized in that a stirring paddle is arranged at the bottom of the degassing tank. The stirring paddle is used for disturbing the water body, so that bubbles in the water overflow and the deposition of particles is prevented.
The sewage treatment system utilizes the filamentous fungi and controls the sludge expansion, and a sludge return pipe and a return pump are arranged between the membrane separation system and the anaerobic tank; a sludge return pipe is arranged between the aerobic tank and the anoxic tank.
The sewage treatment system utilizes filamentous bacteria and controls sludge bulking, and the air floatation tank is connected with a PAC (polyaluminium chloride) dosing device; fixed biological fillers are arranged in the anaerobic tank, the anoxic tank and the aerobic tank; flow impellers are arranged in the anaerobic tank and the anoxic tank; an aerator is arranged at the bottom of the aerobic tank.
The sewage treatment system utilizing the filamentous fungi and controlling the sludge bulking comprises a membrane separation tank and an ultrafiltration membrane filter arranged in the membrane separation tank. And (3) preparing the ultrafiltration membrane which is conventionally used for sewage treatment and is commercially available.
The sewage treatment process adopting any one of the systems and utilizing the filamentous fungi and controlling sludge bulking is characterized by comprising the following steps of:
s1, filtering the sewage through a grid, feeding the sewage into an air floatation tank, adding PAC into the air floatation tank, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage; the grease substances in the air floatation tank are removed, so that excessive propagation of filamentous fungi can be avoided, and the expansion degree of the filamentous fungi is controlled not to be too high;
and (3) the water discharged from the S2 air floatation tank enters a sludge-film mixed biological tank: firstly, reducing dissolved oxygen in sewage by a degassing tank; then enters an anaerobic tank to generate anaerobic phosphorus release reaction; then the sewage enters an anoxic tank to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic pool for further adsorbing and degrading organic matters, carbon element compounds are oxidized into carbon dioxide and water, nitrogen elements are oxidized into nitrite nitrogen and nitrate nitrogen, phosphorus elements are oxidized into phosphate radicals, and the phosphate radicals are absorbed by phosphorus removing bacteria in aerobic microorganisms;
s3, filtering the mud-water mixture from the mud-film mixed biological pond in a membrane separation system, and directly discharging the effluent.
The sewage treatment process using filamentous fungi and controlling sludge bulking in step S2: bubbles in the sewage escape under the disturbance of a stirring paddle at the bottom of the degassing tank, and the retention time of the sewage in the degassing tank is more than or equal to 10 minutes, so that the dissolved oxygen is reduced to less than or equal to 2 mg/L.
The sewage treatment process using filamentous fungi and controlling sludge bulking in step S2: controlling the dissolved oxygen in the aerobic pool area to be 0.5-1 mg/L by reducing the aeration quantity; and the mixed sludge at the tail end of the aerobic tank flows back to the anoxic tank.
The sewage treatment process using filamentous fungi and controlling sludge bulking in step S3: the filtration is ultrafiltration membrane filtration; and returning the sludge generated by filtering to the anaerobic tank.
The expansion state of the filamentous fungi can be controlled by controlling the concentration of dissolved oxygen when the sewage plant normally operates, and the filamentous fungi are easy to propagate when the dissolved oxygen in the aerobic tank is lower than 1mg/L under proper temperature and water inlet pollutant concentration; when the dissolved oxygen is increased to 3mg/L, the filamentous fungi are not easy to propagate. The sludge is easy to expand when the temperature is lower, and when the water temperature is higher than 15 ℃, the activity of various microorganisms in the biochemical pool is better, so that better pollutant removal effect can be achieved without the help of filamentous bacterium expansion; since the filamentous fungi are not easy to propagate at higher temperature, the system and the process of the invention are suitable for being used at low temperature in winter. When the water temperature is lower than 15 ℃, the sewage plant starts to control the sludge expansion state, properly reduces the sludge load and reduces the dissolved oxygen of the aerobic section (the dissolved oxygen in most areas of the aerobic tank is controlled to be 0.5-1 mg/L).
The method for reducing the sludge load comprises the following steps: sludge load is the ratio of the amount of influent contaminant to the amount of activated sludge. The sludge load can be reduced by increasing the concentration of the activated sludge (reducing the sludge discharge);
reducing dissolved oxygen in an aerobic section: by reducing the aeration rate.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a sewage treatment system and a process utilizing filamentous fungi and controlling sludge bulking, which coordinate physicochemical treatment and biological decomposition to control the sludge bulking degree and simultaneously utilize the filamentous fungi to improve the biochemical treatment efficiency.
The invention utilizes the filamentous fungi to treat the sewage, and controls the filamentous fungi to be in a good state (the number of the microscopic filamentous fungi is approximately equal to that of the common activated sludge flocs, and the sludge sedimentation ratio SV30 is about 90) so as to play a role. When the number of the filamentous fungi in the biochemical pond is large, the nitrogen and phosphorus removal efficiency is higher, the total nitrogen concentration of the effluent of the biochemical pond can be reduced to about 10mg/L, and the total phosphorus concentration of the effluent of the biochemical pond can be reduced to about 0.5 mg/L; the efficiency of capturing pollutants is high, the concentration of suspended matters in the effluent of the biochemical tank can be reduced to about 10mg/L, and the effluent quality is good; meanwhile, due to the reduction of aeration, the energy consumption is reduced by about 5 percent. The activated sludge filamentous bacteria has the characteristics of poor settleability during expansion, and the traditional secondary sedimentation tank is difficult to use, so the sludge-water separation method adopts a membrane separation mode, and is different from the traditional sludge-membrane mixing method. In addition, because the filamentous fungi in the aeration tank easily form biological foam, the MBBR mobile biological filler cannot be used in the process of the invention, and only the fixed filler can be used.
The invention relates to a municipal sewage plant, which replaces a primary sedimentation tank with an air floatation tank, more effectively removes lipid substances, can also remove fine suspended matters, and is provided with a degassing tank to ensure the anaerobic environment of a biochemical tank.
Drawings
FIG. 1 is a schematic view of a sewage treatment system using filamentous fungi and controlling sludge bulking according to the present invention, in which: 1-a grid; 2-an air floatation tank; 3-degassing pool; 4-an anaerobic tank; 5-anoxic pond; 6-an aerobic tank; 7-a membrane separation system;
FIG. 2 is a schematic view showing the process of sewage treatment using filamentous fungi and controlling sludge bulking according to the present invention.
Detailed Description
comprises a grid 1, an air flotation tank 2, a mud-film mixed biological tank and a film separation system 7 which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic tank 6; the bottom of the degassing pool 3 is provided with a stirring paddle; a sludge return pipe and a return pump are arranged between the membrane separation system 7 and the anaerobic tank 4; a sludge return pipe is arranged between the aerobic tank 6 and the anoxic tank 5; the air floatation tank 2 is connected with a PAC dosing device; fixed biological fillers are arranged in the anaerobic tank 4, the anoxic tank 5 and the aerobic tank 6; flow impellers are arranged in the anaerobic tank 4 and the anoxic tank 5; an aerator is arranged at the bottom of the aerobic tank 6; the membrane separation system 7 comprises a membrane separation tank and an ultrafiltration membrane filter arranged in the membrane separation tank.
Example 2: a sewage treatment system utilizing filamentous fungi and controlling sludge bulking:
comprises a grid 1, an air flotation tank 2, a mud-film mixed biological tank and a film separation system 7 which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic tank 6.
Example 3: a sewage treatment system utilizing filamentous fungi and controlling sludge bulking:
comprises a grid 1, an air flotation tank 2, a mud-film mixed biological tank and a film separation system 7 which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic tank 6; the bottom of the degassing pool 3 is provided with a stirring paddle; a sludge return pipe and a return pump are arranged between the membrane separation system 7 and the anaerobic tank 4; a sludge return pipe is arranged between the aerobic tank 6 and the anoxic tank 5.
Example 4: a sewage treatment system utilizing filamentous fungi and controlling sludge bulking:
comprises a grid 1, an air flotation tank 2, a mud-film mixed biological tank and a film separation system 7 which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic tank 6; the air floatation tank 2 is connected with a PAC dosing device; fixed biological fillers are arranged in the anaerobic tank 4, the anoxic tank 5 and the aerobic tank 6; flow impellers are arranged in the anaerobic tank 4 and the anoxic tank 5; an aerator is arranged at the bottom of the aerobic tank 6.
Example 5: a sewage treatment system utilizing filamentous fungi and controlling sludge bulking:
comprises a grid 1, an air flotation tank 2, a mud-film mixed biological tank and a film separation system 7 which are connected in sequence; the sludge-film mixed biological tank comprises a degassing tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic tank 6; the membrane separation system 7 comprises a membrane separation tank and an ultrafiltration membrane filter arranged in the membrane separation tank.
Example 6: a sewage treatment process utilizing filamentous fungi and controlling sludge bulking comprises the following steps:
s1, filtering the sewage through a grid 1, feeding the sewage into an air floatation tank 2, adding PAC into the air floatation tank 2, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank 2 enters a sludge-film mixed biological tank: firstly, reducing dissolved oxygen in sewage through a degassing pool 3; then enters an anaerobic tank 4 to generate anaerobic phosphorus release reaction; then enters an anoxic tank 5 to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic pool 6 for further adsorbing and degrading organic matters, carbon element compounds are oxidized into carbon dioxide and water, nitrogen elements are oxidized into nitrite nitrogen and nitrate nitrogen, phosphorus elements are oxidized into phosphate radicals, and the phosphate radicals are absorbed by phosphorus removing bacteria in aerobic microorganisms;
s3, filtering the mud-water mixture from the mud-film mixed biological pond in a membrane separation system 7, and directly discharging the effluent.
Example 7: a sewage treatment process utilizing filamentous fungi and controlling sludge bulking comprises the following steps:
s1, filtering the sewage through a grid 1, feeding the sewage into an air floatation tank 2, adding PAC into the air floatation tank 2, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank 2 enters a sludge-film mixed biological tank: bubbles in the sewage escape under the disturbance of a stirring paddle at the bottom of the degassing tank 3, and the sewage stays in the degassing tank 3 for 10-20 minutes to reduce the dissolved oxygen to 2 mg/L; then enters an anaerobic tank 4 to generate anaerobic phosphorus release reaction; then enters an anoxic tank 5 to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic tank 6 for further adsorbing and degrading organic matters, and the dissolved oxygen in the area of the aerobic tank 6 is controlled to be 1.0mg/L by reducing the aeration amount; oxidizing carbon element compounds into carbon dioxide and water, oxidizing nitrogen elements into nitrite nitrogen and nitrate nitrogen, oxidizing phosphorus elements into phosphate radicals, and simultaneously absorbing the phosphate radicals by utilizing phosphorus removing bacteria in aerobic microorganisms; the mixed sludge at the tail end of the aerobic tank 6 flows back to the anoxic tank 5;
s3, enabling the mud-water mixture from the mud-film mixed biological pool to enter a membrane separation system 7 for ultrafiltration membrane filtration, and directly discharging the effluent; the sludge generated by the filtration flows back to the anaerobic tank 4.
Example 8: a sewage treatment process utilizing filamentous fungi and controlling sludge bulking comprises the following steps:
s1, filtering the sewage through a grid 1, feeding the sewage into an air floatation tank 2, adding PAC into the air floatation tank 2, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank 2 enters a sludge-film mixed biological tank: bubbles in the sewage escape under the disturbance of a stirring paddle at the bottom of the degassing tank 3, and the sewage stays in the degassing tank 3 for 30-40 minutes to reduce the dissolved oxygen to below 1 mg/L; then enters an anaerobic tank 4 to generate anaerobic phosphorus release reaction; then enters an anoxic tank 5 to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic tank 6 for further adsorbing and degrading organic matters, and the dissolved oxygen in the area of the aerobic tank 6 is controlled to be 0.5mg/L by reducing the aeration amount; oxidizing carbon element compounds into carbon dioxide and water, oxidizing nitrogen elements into nitrite nitrogen and nitrate nitrogen, oxidizing phosphorus elements into phosphate radicals, and simultaneously absorbing the phosphate radicals by utilizing phosphorus removing bacteria in aerobic microorganisms; the mixed sludge at the tail end of the aerobic tank 6 flows back to the anoxic tank 5;
s3, filtering the mud-water mixture from the mud-film mixed biological pond in a membrane separation system 7, and directly discharging the effluent.
Example 9: a sewage treatment process utilizing filamentous fungi and controlling sludge bulking comprises the following steps:
s1, filtering the sewage through a grid 1, feeding the sewage into an air floatation tank 2, adding PAC into the air floatation tank 2, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank 2 enters a sludge-film mixed biological tank: bubbles in the sewage escape under the disturbance of a stirring paddle at the bottom of the degassing tank 3, and the sewage stays in the degassing tank 3 for 30 minutes to reduce the dissolved oxygen to 1-2 mg/L; then enters an anaerobic tank 4 to generate anaerobic phosphorus release reaction; then enters an anoxic tank 5 to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic pool 6 for further adsorbing and degrading organic matters, carbon element compounds are oxidized into carbon dioxide and water, nitrogen elements are oxidized into nitrite nitrogen and nitrate nitrogen, phosphorus elements are oxidized into phosphate radicals, and the phosphate radicals are absorbed by phosphorus removing bacteria in aerobic microorganisms;
s3, enabling the mud-water mixture from the mud-film mixed biological pool to enter a membrane separation system 7 for ultrafiltration membrane filtration, and directly discharging the effluent; the sludge generated by the filtration flows back to the anaerobic tank 4.
Example 10: a sewage treatment process utilizing filamentous fungi and controlling sludge bulking comprises the following steps:
s1, filtering the sewage through a grid 1, feeding the sewage into an air floatation tank 2, adding PAC into the air floatation tank 2, and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank 2 enters a sludge-film mixed biological tank: firstly, reducing dissolved oxygen in sewage through a degassing pool 3; then enters an anaerobic tank 4 to generate anaerobic phosphorus release reaction; then enters an anoxic tank 5 to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic tank 6 for further adsorbing and degrading organic matters, and the dissolved oxygen in the area of the aerobic tank 6 is controlled to be 0.8mg/L by reducing the aeration amount; oxidizing carbon element compounds into carbon dioxide and water, oxidizing nitrogen elements into nitrite nitrogen and nitrate nitrogen, oxidizing phosphorus elements into phosphate radicals, and simultaneously absorbing the phosphate radicals by utilizing phosphorus removing bacteria in aerobic microorganisms; the mixed sludge at the tail end of the aerobic tank 6 flows back to the anoxic tank 5;
s3, filtering the mud-water mixture from the mud-film mixed biological pond in a membrane separation system 7, and directly discharging the effluent.
Claims (9)
1. A sewage treatment system utilizing filamentous fungi and controlling sludge bulking is characterized in that: comprises a grid (1), an air flotation tank (2), a mud-film mixed biological tank and a film separation system (7) which are connected in sequence; the mud-film mixed biological pool comprises a degassing pool (3), an anaerobic pool (4), an anoxic pool (5) and an aerobic pool (6).
2. The sewage treatment system using filamentous bacteria and controlling sludge bulking according to claim 1, wherein: and a stirring paddle is arranged at the bottom of the degassing pool (3).
3. The sewage treatment system using filamentous bacteria and controlling sludge bulking according to claim 1, wherein: a sludge return pipe and a return pump are arranged between the membrane separation system (7) and the anaerobic tank (4); a sludge return pipe is arranged between the aerobic tank (6) and the anoxic tank (5).
4. The sewage treatment system using filamentous bacteria and controlling sludge bulking according to claim 1, wherein: the air floatation tank (2) is connected with a PAC dosing device; fixed biological fillers are arranged in the anaerobic tank (4), the anoxic tank (5) and the aerobic tank (6); flow impellers are arranged in the anaerobic tank (4) and the anoxic tank (5); an aerator is arranged at the bottom of the aerobic tank (6).
5. The sewage treatment system using filamentous bacteria and controlling sludge bulking according to claim 1, wherein: the membrane separation system (7) comprises a membrane separation pool and an ultrafiltration membrane filter arranged in the membrane separation pool.
6. A sewage treatment process using filamentous fungi and controlling sludge bulking using the system according to any one of claims 1 to 5, comprising the steps of:
s1, filtering the sewage through a grid (1), feeding the sewage into an air floatation tank (2), adding PAC into the air floatation tank (2), and removing grease substances containing higher fatty acid and fine insoluble substances in the sewage;
and (2) the effluent of the S2 air flotation tank (2) enters a sludge-film mixed biological tank: firstly, reducing dissolved oxygen in sewage through a degassing pool (3); then enters an anaerobic tank (4) to generate anaerobic phosphorus release reaction; then enters an anoxic tank (5) to adsorb and degrade organic matters, so that nitrite nitrogen and nitrate nitrogen in the sewage are generated under the action of denitrifying bacteria to be released; then the sewage enters an aerobic pool (6) for further adsorbing and degrading organic matters, carbon element compounds are oxidized into carbon dioxide and water, nitrogen elements are oxidized into nitrite nitrogen and nitrate nitrogen, phosphorus elements are oxidized into phosphate radicals, and the phosphate radicals are absorbed by phosphorus removing bacteria in aerobic microorganisms;
s3, filtering the mud-water mixture from the mud-film mixed biological pond in a membrane separation system (7), and directly discharging the effluent.
7. The process for sewage treatment with filamentous fungi and sludge bulking control according to claim 6, wherein in step S2: bubbles in the sewage escape under the disturbance of a stirring paddle at the bottom of the degassing tank (3), and the retention time of the sewage in the degassing tank is more than or equal to 10 minutes, so that the dissolved oxygen is reduced to less than or equal to 2 mg/L.
8. The process for sewage treatment with filamentous fungi and sludge bulking control according to claim 6, wherein in step S2: the aeration quantity is reduced to control the dissolved oxygen in the area of the aerobic tank (6) to be 0.5-1 mg/L; and the mixed sludge at the tail end of the aerobic tank (6) flows back to the anoxic tank (5).
9. The process for sewage treatment with filamentous fungi and sludge bulking control according to claim 6, wherein in step S3: the filtration is ultrafiltration membrane filtration; the sludge generated by filtering flows back to the anaerobic tank (4).
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