CN113044957A - Sludge-film composite sewage treatment system and method - Google Patents
Sludge-film composite sewage treatment system and method Download PDFInfo
- Publication number
- CN113044957A CN113044957A CN202110264347.7A CN202110264347A CN113044957A CN 113044957 A CN113044957 A CN 113044957A CN 202110264347 A CN202110264347 A CN 202110264347A CN 113044957 A CN113044957 A CN 113044957A
- Authority
- CN
- China
- Prior art keywords
- sludge
- denitrification
- zone
- sewage treatment
- sewage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 103
- 239000002131 composite material Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000010802 sludge Substances 0.000 claims abstract description 64
- 239000012528 membrane Substances 0.000 claims abstract description 60
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 41
- 239000011574 phosphorus Substances 0.000 claims abstract description 41
- 238000005273 aeration Methods 0.000 claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 241000894006 Bacteria Species 0.000 claims description 63
- 239000000945 filler Substances 0.000 claims description 40
- 230000001546 nitrifying effect Effects 0.000 claims description 20
- 229920000388 Polyphosphate Polymers 0.000 claims description 12
- 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 12
- 239000001205 polyphosphate Substances 0.000 claims description 12
- 235000011176 polyphosphates Nutrition 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 229910052816 inorganic phosphate Inorganic materials 0.000 claims description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 206010021143 Hypoxia Diseases 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 3
- 238000001914 filtration Methods 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 18
- 230000014759 maintenance of location Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 description 6
- 230000000813 microbial effect Effects 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 230000003834 intracellular effect Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229920002527 Glycogen Polymers 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 208000037534 Progressive hemifacial atrophy Diseases 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229940096919 glycogen Drugs 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012017 passive hemagglutination assay Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F3/02—Aerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- 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
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (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
In order to solve the problems of high construction cost, difficult maintenance and contradiction of sludge age of the existing underground sewage treatment plant, the invention provides a sludge-membrane composite sewage treatment system which comprises an AO (anaerobic-anoxic-oxic) tank, a sludge-membrane composite anoxic tank, an aeration biological filter tank and an upflow denitrification deep bed filter tank, wherein the AO tank comprises an anaerobic zone and an aerobic zone, the sludge-membrane composite anoxic tank comprises a sludge-water sedimentation zone and a denitrification zone, the effluent of the denitrification zone is guided to the aeration biological filter tank, part of the effluent of the aeration biological filter tank flows back to the sludge-water sedimentation zone, and part of the effluent is guided to the upflow denitrification deep bed filter tank. Meanwhile, the invention also discloses a sludge-membrane composite sewage treatment method. The sludge-film composite sewage treatment system provided by the invention effectively solves the problem of sludge age contradiction in the processes of phosphorus removal and nitrification, improves the nitrogen and phosphorus removal efficiency, obviously reduces the total retention time and saves the occupied area.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sludge-film composite sewage treatment system and method.
Background
With the increasing development speed of cities, urban sewage treatment plants in domestic economically-developed areas are gradually surrounded by surrounding high buildings, the adjacent situation is more and more prominent, and then the construction mode of underground sewage treatment plants is provided.
The underground sewage treatment plant has the greatest advantage of saving land resources, can effectively isolate secondary pollution such as odor, noise and the like, constructs the ground above the sewage treatment plant into an ecological landscape park, and can provide comfortable spaces for citizens such as physical education, entertainment, science popularization education and the like.
At present, the underground sewage treatment plant mostly adopts a fully underground sewage plant, and mostly adopts an AAO process and a derivative process thereof (such as an AAO + MBBR and an AAO + MBR combined process), so that each treatment unit is integrated, and compared with the traditional overground sewage treatment plant, the underground sewage treatment plant is more compact and saves the occupied area.
The full underground sewage treatment plant has large buried depth, high foundation pit excavation difficulty (the general underground excavation depth is as high as 14-16 m), complex construction and high investment and construction cost; the overhaul, maintenance and installation of the equipment are influenced to a certain extent due to the limitation of underground space; special ventilation openings are needed to ventilate the underground space, and equipment facilities are complex.
The AAO process is a relatively classical sewage treatment technique in activated sludge, and generally comprises an anaerobic tank and an aerobic tank. Wherein, the polyphosphate accumulating bacteria in the active sludge of the anaerobic tank decomposes intracellular polyphosphate (PolyP) and releases the intracellular polyphosphate in the form of inorganic phosphate. Denitrifying bacteria (the sludge age is 3-5 d) exist in the anoxic tank, and nitrate nitrogen is converted into nitrogen to remove total nitrogen. The phosphorus accumulating bacteria (the sludge age is short and is only 3.5-7 d) in the aerobic tank excessively absorb the phosphate in the solution to synthesize Poly-p; in addition, nitrifying bacteria (the sludge age is 10-20 days) exist in the aerobic tank, mainly the ammonia nitrogen in the sewage is converted into nitrate nitrogen, and in order to improve the denitrification efficiency of the system, the effluent of the aerobic tank needs to flow back to the anaerobic tank, so that the denitrification efficiency is improved. From the analysis of biological phosphorus removal, the discharge of the phosphorus-rich sludge is the only way for realizing the phosphorus reduction of the system. If sludge is discharged untimely, intracellular glycogen is consumed by the phosphorus accumulating bacteria endogenously, storage of poly-beta-hydroxyalkanoic acid (PHAs) by the phosphorus accumulating bacteria in the anaerobic zone is influenced, phosphorus removal efficiency of a system is reduced, and even secondary release of phosphate can be caused. The generation period of the nitrifying bacteria is long, and the nitrifying bacteria are required to be controlled to be in a mud-age state to be the dominant bacteria group.
The analysis shows that the AAO system mainly has sludge age contradiction between phosphorus accumulating bacteria and nitrifying bacteria, so that nitrification and phosphorus removal are mutually restricted, and if the sludge age is too high, phosphorus removal is not facilitated, and if the sludge age is too low, growth of nitrifying bacteria is not facilitated, nitrification reaction is influenced, and further, the nitrogen removal efficiency is reduced. In order to ensure the full nitrification of the AAO system, the retention time of the aerobic tank is designed to be longer, so that the total retention time of the system is long and the occupied area is large.
In addition, a secondary sedimentation tank is usually arranged behind the aerobic tank, in order to perform sedimentation separation on the mixed liquor containing activated sludge in the aerobic tank, and then remove total phosphorus by discharging excess sludge, and in order to maintain the concentration of the activated sludge in the system, a part of the sludge needs to be returned.
Disclosure of Invention
The invention provides a sludge-membrane composite sewage treatment system and method, aiming at the problems of high construction cost, difficult maintenance and contradiction of sludge age in the treatment of the existing underground sewage plant.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the invention provides a sludge-membrane composite sewage treatment system, which comprises an AO (anaerobic-anoxic) tank, a sludge-membrane composite anoxic tank, an aeration biological filter tank and an upflow denitrification deep bed filter tank, wherein the AO tank comprises an anaerobic zone and an aerobic zone, effluent of the anaerobic zone is guided to the aerobic zone, the sludge-membrane composite anoxic tank comprises a sludge-water sedimentation zone and a denitrification zone, the denitrification zone is positioned above the sludge-water sedimentation zone, effluent of the aerobic zone is guided to the sludge-water sedimentation zone, effluent of the denitrification zone is guided to the aeration biological filter tank, part of effluent of the aeration biological filter tank flows back to the sludge-water sedimentation zone, and part of effluent of the aeration biological filter tank is guided to the upflow denitrification deep bed filter tank.
Optionally, in the AO tank, the anaerobic zone and the aerobic zone are arranged side by side, the aerobic zone is discharged from the top, and the top of the aerobic zone is discharged and is guided to the bottom of the muddy water sedimentation zone by force.
Optionally, a water distribution and sludge discharge device is arranged at the bottom of the muddy water sedimentation area, and the effluent of the aerobic area is guided to the muddy water sedimentation area through the water distribution and sludge discharge device.
Optionally, a filler zone is arranged in the denitrification zone, first fillers are filled in the filler zone, denitrifying bacteria are attached to the first fillers, and a flushing aeration system is arranged at the bottom of the filler zone.
Optionally, an aeration device and a second filler are arranged in the biological aerated filter, and nitrobacteria are attached to the second filler.
Optionally, a third filler is filled in the upward flow denitrification deep bed filter, denitrifying bacteria are attached to the third filler, and a carbon source is added to the inlet water of the upward flow denitrification deep bed filter.
Optionally, the horizontal height of the biological aerated filter is lower than that of the sludge membrane composite anoxic tank, and water flows out from the top of the denitrification region and is guided to the bottom of the biological aerated filter by gravity.
Optionally, a return pipe is connected between the outlet water of the biological aerated filter and the inlet water of the sludge membrane composite anoxic tank, and a water pump and a flow meter are arranged on the return pipe.
Optionally, the AO pond, the sludge membrane composite anoxic pond, the biological aerated filter and the upflow denitrification deep bed filter all adopt a modular structure with a steel structure.
On the other hand, the invention provides a sludge-membrane composite sewage treatment method, which adopts the sludge-membrane composite sewage treatment system and comprises the following treatment steps:
introducing sewage into an anaerobic zone of an AO pool, decomposing polyphosphate by phosphorus accumulating bacteria under anaerobic condition, releasing in the form of inorganic phosphate, introducing the sewage treated in the anaerobic zone into an aerobic zone, and excessively absorbing phosphate in solution by the phosphorus accumulating bacteria to form phosphorus-containing sludge under aerobic condition;
the sewage treated by the AO pool is led into a mud-water sedimentation area of a mud-film composite anoxic pool, the phosphorus-containing sludge is settled under the action of gravity and is periodically discharged to remove total phosphorus, the sewage rises to a denitrification area, the denitrification area is controlled under an anoxic environment, denitrification treatment is carried out on the sewage by denitrifying bacteria, nitrate nitrogen in the sewage is converted into nitrogen to be removed, and denitrification is realized;
introducing the sewage treated by the sludge-film composite anoxic tank into the aeration biological filter, converting ammonia nitrogen in the sewage into nitrate nitrogen by nitrifying bacteria in the aeration biological filter, and refluxing part of nitrified liquid treated by the aeration biological filter to the sludge-film composite anoxic tank for denitrification treatment;
introducing the nitrified liquid treated by the biological aerated filter into an upward flow denitrification deep bed filter, performing denitrification treatment on the sewage by virtue of denitrifying bacteria, converting nitrate nitrogen in the sewage into nitrogen and removing the nitrogen, thereby realizing denitrification. Meanwhile, SS and TP in the sewage can be removed by physical interception of the filter material, and the effluent is further ensured to be discharged up to the standard.
According to the sludge-membrane composite sewage treatment system provided by the invention, an AO pool is adopted to carry out activated sludge dephosphorization, so that phosphorus accumulating bacteria in the AO pool become dominant strains, and meanwhile, a sludge-membrane composite anoxic pool comprising a sludge-water settling area and a denitrification area is designed, wherein the sludge-water settling area is used for settling phosphorus-containing sludge, and finally, the purpose of removing total phosphorus is achieved by discharging residual sludge, a biological membrane with dominant denitrifying bacteria is formed in the denitrification area and is used for carrying out denitrification treatment, the denitrification process and the phosphorus removal process are separated in different subareas, meanwhile, an aeration biological filter is arranged behind the sludge-membrane composite anoxic pool to form a biological membrane with dominant nitrifying bacteria for carrying out nitrification treatment, nitrified liquid after the nitrification treatment flows back to the sludge-membrane composite anoxic pool to strengthen the denitrification process, the denitrification effect is improved, and aiming at the high discharge standard of sewage, an upflow denitrification deep bed filter is arranged behind the aeration biological filter, the SS, TP and TN effluent can be further ensured to be discharged after reaching the standard, and a carbon source is added at the water inlet end of the upflow denitrification deep bed filter, so that a biological film with dominant denitrifying bacteria can be cultured on the filler, and the deep denitrification is realized. The sludge-membrane composite sewage treatment system fully utilizes the advantages of an activated sludge method and a biofilm method, completely separates the treatment systems of phosphorus accumulating bacteria, nitrifying bacteria and denitrifying bacteria, is convenient for controlling the treatment units of different dominant bacteria, keeps the sludge age requirement, and effectively solves the problem of sludge age contradiction in the processes of phosphorus removal and nitrification; meanwhile, the fixed bed biofilm method is utilized to culture nitrifying and denitrifying bacteria, the condition that microorganisms are discharged and lost along with sludge in the activated sludge method does not exist, the microbial biomass per unit volume is large, and the denitrification efficiency is higher. In addition, the aerobic zone of the AO pool of the sludge-film composite sewage treatment system mainly absorbs phosphorus, and the nitration reaction is mainly finished in the aeration biological filter, so that the retention time of the aerobic zone of the AO pool is shortened. Because the aeration biological filter and the upward flow deep bed filter belong to the biofilm process, the retention time is only one tenth to one fifth of that of the traditional activated sludge process, the retention time of the sludge-film composite sewage treatment system is short, and the occupied area is obviously saved.
Drawings
FIG. 1 is a schematic structural diagram of a sludge-membrane composite sewage treatment system provided by the invention.
The reference numbers in the drawings of the specification are as follows:
1. a building body; 2. an AO cell; 21. an anaerobic zone; 22. an aerobic zone; 3. a mud film composite anoxic pond; 31. a muddy water settling area; 32. a denitrification region; 33. flushing the aeration system; 34. a water distribution and sludge discharge device; 4. an aeration biological filter; 5. an upward flow denitrification deep bed filter; 6. a water pump; 7. a flow meter; 8. a lighting system; 9. a ventilation system; 10. a green belt.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a sludge-membrane composite sewage treatment system, which includes an AO tank 2, a sludge-membrane composite anoxic tank 3, a biological aerated filter tank 4, and an upflow denitrification deep bed filter tank 5, wherein the AO tank 2 includes an anaerobic zone 21 and an aerobic zone 22, effluent of the anaerobic zone 21 is directed to the aerobic zone 22, the sludge-membrane composite anoxic tank 3 includes a sludge-water settling zone 31 and a denitrification zone 32, the denitrification zone 32 is located above the sludge-water settling zone 31, effluent of the aerobic zone 22 is directed to the sludge-water settling zone 31, effluent of the denitrification zone 32 is directed to the biological aerated filter tank 4, and effluent of the biological aerated filter tank 4 partially flows back to the sludge-water settling zone 31 and partially is directed to the upflow denitrification deep bed filter tank 5.
The sludge-membrane composite sewage treatment system adopts an AO pool 2 to remove phosphorus from activated sludge, so that phosphorus accumulating bacteria in the AO pool 2 become dominant bacteria, and designs a sludge-membrane composite anoxic pool 3 comprising a sludge-water settling area 31 and a denitrification area 32, wherein the sludge-water settling area 31 is used for settling phosphorus-containing sludge, and finally the purpose of removing total phosphorus is achieved by discharging residual sludge, a biological membrane with dominant denitrifying bacteria is formed in the denitrification area 32 and is used for carrying out denitrification treatment, the denitrification process and the phosphorus removal process are separated in different subareas, meanwhile, an aeration biological tank 4 is arranged behind the sludge-membrane composite anoxic pool 3 to form a biological membrane with dominant nitrifying bacteria for carrying out nitrification treatment, and nitrified liquid after the nitrification treatment flows back to the sludge-membrane composite anoxic pool 3 to strengthen the denitrification process, so as to improve the denitrification effect and aim at the high discharge standard of a sewage treatment plant, an upflow denitrification deep bed filter 5 is arranged behind the aeration biological filter 4, which can further ensure that the SS, TP and TN effluent reach the discharge standard, and a carbon source is added at the water inlet end of the upflow denitrification deep bed filter 5, so that a biological film with dominant denitrifying bacteria can be cultured on the filler, and the deep denitrification is realized. The sludge-membrane composite sewage treatment system fully utilizes the advantages of an activated sludge method and a biofilm method, completely separates the treatment systems of phosphorus accumulating bacteria, nitrifying bacteria and denitrifying bacteria, is convenient for controlling the treatment units of different dominant bacteria, keeps the sludge age requirement, and effectively solves the problem of sludge age contradiction in the processes of phosphorus removal and nitrification; meanwhile, the fixed bed biofilm method is utilized to culture nitrifying and denitrifying bacteria, the condition that microorganisms are discharged and lost along with sludge in the activated sludge method does not exist, the microbial biomass per unit volume is large, and the denitrification efficiency is higher. In addition, the aerobic zone 22 of the AO pool 2 of the sludge-film composite sewage treatment system mainly finishes the absorption of phosphorus, and the nitration reaction is mainly finished in the biological aerated filter 3, thereby shortening the retention time of the aerobic zone of the AO pool 2. Because the aeration biological filter 3 and the upward flow deep bed filter 5 both belong to the biofilm process, the retention time is only one tenth to one fifth of that of the traditional activated sludge process, the retention time of the sludge-film composite sewage treatment system is short, and the occupied area is obviously saved.
In one embodiment, the anaerobic zone 21 and the aerobic zone 22 are arranged side by side in the AO-pond 2, the aerobic zone 22 is top effluent, and the top effluent of the aerobic zone 22 is gravity guided to the bottom of the sludge-water settling zone 31.
The dissolved oxygen in the anaerobic zone 21 is less than 0.2mg/L (anaerobic condition), the polyphosphate in the activated sludge hydrolyzes ATP in the body to form ADP and energy, and meanwhile, intracellular polyphosphate (PolyP) is decomposed and released out in the form of inorganic phosphate; the dissolved oxygen of the aerobic zone 22 is 1.5-2.5 mg/L, as the sludge age of the phosphorus-accumulating bacteria is short, dominant strains of the phosphorus-accumulating bacteria can be formed in the aerobic zone 22 by controlling the sludge discharge amount, the phosphorus-accumulating bacteria can complete the reproduction and metabolism by utilizing the energy generated by oxidizing PHB stored in a decomposition body, ADP obtains the energy and can be used for synthesizing ATP, and meanwhile, the phosphorus-accumulating bacteria excessively absorb phosphate in a solution to synthesize Poly-p.
In an embodiment, a water distribution and sludge discharge device 34 is disposed at the bottom of the sludge-water settling area 31, and the effluent of the aerobic area 22 is guided to the sludge-water settling area 31 through the water distribution and sludge discharge device 34.
The water distribution and sludge discharge device 34 is used for guiding the effluent of the aerobic zone 22 to the sludge-water settling zone 31, and is also used for discharging the sludge in the sludge-water settling zone 31 at regular time, so as to avoid the pollution of the denitrification region 32 caused by the over-high content of the sludge in the sludge-water settling zone 31.
In one embodiment, the denitrification region 32 is provided with a filler region filled with a first filler to which denitrifying bacteria are attached, and the bottom of the filler region is provided with a flushing aeration system 33.
The first filler in the filler district provides the attachment site for the denitrifying bacteria, controls the filler district is in the oxygen deficiency state to make the denitrifying bacteria be in the microbial film is formed on first filler surface, and sewage is through the filler district, and the denitrifying bacteria in the microbial film turns into nitrogen gas with the nitrate nitrogen in the sewage, improves denitrification nitrogen removal efficiency, and simultaneously, the quality of water behind muddy water settlement district 31 is cleaner, still contains certain tiny floc, can be held back by the filler in filler district.
The flushing aeration system 33 is used for removing the sludge intercepted on the surface of the first filler and the aged microbial film, and rapidly recovering the interception effect and the denitrification efficiency of the first filler.
Preferably, the first filler is selected from volcanic rock or ceramsite fillers.
In an embodiment, an aeration device and a second filler are arranged in the biological aerated filter 4, nitrifying bacteria are attached to the second filler, dominant strains of the nitrifying bacteria are formed in the biological aerated filter 4 by controlling the discharge ratio and the oxygen condition of sludge, so that sewage is nitrified, nitrified liquid after nitrification can partially flow back to the sludge-membrane composite anoxic tank 3 to strengthen denitrification, and partially flow to the upflow denitrification deep bed to conduct denitrification, so that the treatment conditions of the sludge-membrane composite sewage treatment system are fully utilized, the retention time required by sewage treatment is reduced, the treatment load of the subsequent upflow denitrification deep bed can be effectively reduced, the equipment volume can be reduced, and the space utilization efficiency can be improved.
Preferably, the second filler is selected from volcanic rock or ceramsite filter materials.
In one embodiment, the upflow denitrification deep bed filter 5 is filled with a third filler, denitrifying bacteria are attached to the third filler, and the influent water of the upflow denitrification deep bed filter 5 needs an external carbon source.
The upward flow denitrification deep bed filter 5 is used for denitrification treatment.
Preferably, the third filler is selected from a quartz sand filter.
The third packing forms a filter bed that can further hold up SS (suspended matter) and TP.
It should be noted that the "carbon source is added to the influent water of the upward flow denitrification deep bed filter 5" is a means that can be selectively added, and is only used when the total nitrogen content of the effluent water of the biological aerated filter 4 is higher than the discharge standard, so as to improve the denitrification efficiency of denitrifying bacteria and ensure that the effluent water can reach the discharge standard.
In one embodiment, the level of the biological aerated filter 4 is lower than that of the sludge membrane composite anoxic tank 3, and the water flows out from the top of the denitrification region 32 and is guided to the bottom of the biological aerated filter 4 by gravity.
By setting the relative heights of the biological aerated filter 4 and the sludge membrane composite anoxic tank 3, the sewage can be promoted to flow in different devices by fully utilizing gravity, so that the use of a pump is reduced, and the energy consumption of a system is reduced.
In one embodiment, a return pipe is connected between the outlet water of the biological aerated filter 4 and the inlet water of the sludge membrane composite anoxic tank 3, and a water pump 6 and a flow meter 7 are arranged on the return pipe.
The water pump 6 is used for driving the nitrified liquid in the return pipe to flow back, and the flow meter 7 is used for monitoring the flow of the return pipe so as to control the water outlet reflux quantity of the biological aerated filter 4.
In one embodiment, the AO pool 2, the sludge-membrane composite anoxic pool 3, the biological aerated filter 4 and the upflow denitrification deep bed filter 5 all adopt a modular structure of a steel structure, and have the advantages of short construction period and convenience in installation.
Another embodiment of the present invention provides a sludge-membrane composite sewage treatment method, which adopts the above sludge-membrane composite sewage treatment system, and comprises the following treatment steps:
introducing sewage into an anaerobic zone 21 of an AO pool 2, decomposing polyphosphate by polyphosphate accumulating bacteria under anaerobic conditions, releasing in the form of inorganic phosphate, introducing the sewage treated in the anaerobic zone 21 into an aerobic zone 22, and excessively absorbing phosphate in solution by the polyphosphate accumulating bacteria to form phosphorus-containing sludge under aerobic conditions;
the sewage treated by the AO pool 2 is led into a muddy water sedimentation area 31 of the mud film composite anoxic pool 3, the phosphorus-containing sludge is settled under the action of gravity and is periodically discharged, so that the total phosphorus is removed, the sewage rises to a denitrification area 32, the denitrification area 32 is controlled under an anoxic environment, denitrification treatment is carried out on the sewage by denitrifying bacteria, nitrate nitrogen in the sewage is converted into nitrogen to be removed, and the denitrification is realized;
the sewage treated by the sludge membrane composite anoxic tank 3 is led into the aeration biological filter tank 4, the nitrifying bacteria in the aeration biological filter tank 4 convert ammonia nitrogen in the sewage into nitrate nitrogen, and part of nitrifying liquid treated by the aeration biological filter tank 4 flows back to the sludge membrane composite anoxic tank 3 for denitrification treatment;
the nitrifying liquid treated by the biological aerated filter 4 is led into an upward flow denitrification deep bed filter 5, denitrification treatment is carried out on the sewage by denitrifying bacteria, nitrate nitrogen in the sewage is converted into nitrogen to be removed, and denitrification is realized. Meanwhile, SS and TP in the sewage can be removed by physical interception of the filter material, and the effluent is further ensured to be discharged up to the standard. Through practical verification, the sludge-film composite sewage treatment method has good effect when used for sewage treatment, and the effluent quality is superior to the first-class A standard of pollutant discharge Standard of urban sewage treatment plant (GB 18918-. As shown in fig. 1, another embodiment of the present invention provides a semi-underground sewage treatment plant, which includes a building 1 exposed above the ground, an underground space sinking below the ground, and the sludge-membrane composite sewage treatment system, wherein the building 1 is located above the underground space, and the building 1 and the underground space surround to form a sewage treatment space for accommodating the sludge-membrane composite sewage treatment system.
The semi-underground sewage treatment plant adopting the sludge-film composite sewage treatment method has the advantages of short total retention time, small occupied area, capability of realizing full-automatic control, convenience in daily maintenance, simplicity in management and operation, low investment cost, low operation and maintenance cost and the like.
In one embodiment, the side wall of the building body 1 is provided with a lighting system 8 and a ventilation system 9, the top of the building body 1 is covered with soil to build a leisure and entertainment place, and the building body is fused with surrounding landscapes to build an ecological landscape park for surrounding residents to enjoy leisure and entertainment. The periphery of the building body 1 is provided with a green belt 10.
The leisure and entertainment places comprise ecological landscape parks, stadiums and the like.
The building 1 is partially positioned on the ground, so that natural light can be effectively utilized for illumination, and compared with a full underground sewage treatment plant, the power consumption can be saved by 5-10%; the ventilation system 9 is designed around the sewage plant, so that ventilation is simple, and special complicated equipment is not required; in addition, the fire safety design requirement is low. Therefore, the sludge-film composite sewage treatment system and the method are applied to the semi-underground sewage treatment plant, the occupied area is small, the construction cost is obviously reduced compared with that of the underground sewage treatment plant adopting the traditional AAO and derivative process thereof, and the advantages are obvious.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a compound sewage treatment system of mud membrane, its characterized in that, includes AO pond, the compound oxygen deficiency pond of mud membrane, bological aerated filter and the deep bed filtering pond of upflow denitrification, the AO pond includes anaerobic zone and aerobic zone, the play water direction in anaerobic zone extremely the aerobic zone, the compound oxygen deficiency pond of mud membrane includes muddy water settlement zone and denitrification district, denitrification district is located the top in muddy water settlement zone, the play water direction in aerobic zone extremely muddy water settlement zone, the play water direction in denitrification district extremely the bological aerated filter, the play water part of bological aerated filter flow back to muddy water settlement zone, the part direction go up the deep bed filtering pond of upflow denitrification.
2. The sludge-membrane composite sewage treatment system as claimed in claim 1 wherein in the AO-pool, the anaerobic zone and the aerobic zone are arranged side by side, the aerobic zone is top effluent, the top effluent of the aerobic zone is gravity-guided to the bottom of the sludge-water settling zone.
3. The sludge-membrane composite sewage treatment system as claimed in claim 1, wherein the bottom of the sludge-water settling zone is provided with a water distribution sludge discharge device, and the effluent of the aerobic zone is guided to the sludge-water settling zone through the water distribution sludge discharge device.
4. The sludge-membrane composite sewage treatment system as claimed in claim 1, wherein the denitrification region is provided with a filler region, the filler region is filled with a first filler, denitrifying bacteria are attached to the first filler, and the bottom of the filler region is provided with a flushing aeration system.
5. The sludge-membrane composite sewage treatment system according to claim 1 wherein an aeration device and a second filler are arranged in the biological aerated filter, and nitrifying bacteria are attached to the second filler.
6. The sludge-membrane composite sewage treatment system of claim 1 wherein the upflow denitrification deep bed filter is filled with a third filler, denitrifying bacteria are attached to the third filler, and a carbon source is added to the influent water of the upflow denitrification deep bed filter.
7. The sludge-membrane composite sewage treatment system as claimed in claim 1, wherein the level of the biological aerated filter is lower than that of the sludge-membrane composite anoxic tank, and the top of the denitrification region is drained and guided to the bottom of the biological aerated filter by gravity.
8. The sludge-membrane composite sewage treatment system as claimed in claim 1, wherein a return pipe is connected between the outlet water of the biological aerated filter and the inlet water of the sludge-membrane composite anoxic tank, and a water pump and a flowmeter are arranged on the return pipe.
9. The sludge-membrane composite sewage treatment system according to claim 1 wherein the AO tank, the sludge-membrane composite anoxic tank, the biological aerated filter and the upflow denitrification deep bed filter are all of a modular structure of steel structure.
10. The sludge-membrane composite sewage treatment method is characterized in that the sludge-membrane composite sewage treatment system according to any one of claims 1 to 9 is adopted, and the sludge-membrane composite sewage treatment method comprises the following treatment steps:
introducing sewage into an anaerobic zone of an AO pool, decomposing polyphosphate by phosphorus accumulating bacteria under anaerobic condition, releasing in the form of inorganic phosphate, introducing the sewage treated in the anaerobic zone into an aerobic zone, and excessively absorbing phosphate in solution by the phosphorus accumulating bacteria to form phosphorus-containing sludge under aerobic condition;
the sewage treated by the AO pool is led into a mud-water sedimentation area of a mud-film composite anoxic pool, the phosphorus-containing sludge is settled under the action of gravity and is periodically discharged to remove total phosphorus, the sewage rises to a denitrification area, the denitrification area is controlled under an anoxic environment, denitrification treatment is carried out on the sewage by denitrifying bacteria, nitrate nitrogen in the sewage is converted into nitrogen to be removed, and denitrification is realized;
introducing the sewage treated by the sludge-film composite anoxic tank into the aeration biological filter, converting ammonia nitrogen in the sewage into nitrate nitrogen by nitrifying bacteria in the aeration biological filter, and refluxing part of nitrified liquid treated by the aeration biological filter to the sludge-film composite anoxic tank for denitrification treatment;
nitrifying liquid treated by the biological aerated filter is led into the upward flow denitrification deep bed filter, denitrification treatment is carried out on sewage by virtue of denitrifying bacteria, nitrate nitrogen in the sewage is converted into nitrogen to be removed, the denitrification effect is realized, and meanwhile SS and TP in the sewage can be removed by the physical interception effect of a filter material, so that the effluent is further ensured to be discharged up to the standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110264347.7A CN113044957A (en) | 2021-03-11 | 2021-03-11 | Sludge-film composite sewage treatment system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110264347.7A CN113044957A (en) | 2021-03-11 | 2021-03-11 | Sludge-film composite sewage treatment system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113044957A true CN113044957A (en) | 2021-06-29 |
Family
ID=76511485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110264347.7A Pending CN113044957A (en) | 2021-03-11 | 2021-03-11 | Sludge-film composite sewage treatment system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113044957A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565998A (en) * | 2003-06-17 | 2005-01-19 | 上海市政工程设计研究院 | Activated sludge and biomembrane combined biological denitrification and dephosphorization treatment process |
| CN101591065A (en) * | 2008-05-27 | 2009-12-02 | 宋乾武 | Sewage double-biomembrane deep treatment technology |
| CN105293698A (en) * | 2014-08-01 | 2016-02-03 | 蒋华 | Domestic sewage treatment method |
| CN108675451A (en) * | 2018-05-14 | 2018-10-19 | 北京工业大学 | The apparatus and method of continuous flow AO-BCO-DEAMOX advanced nitrogen dephosphorization |
-
2021
- 2021-03-11 CN CN202110264347.7A patent/CN113044957A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565998A (en) * | 2003-06-17 | 2005-01-19 | 上海市政工程设计研究院 | Activated sludge and biomembrane combined biological denitrification and dephosphorization treatment process |
| CN101591065A (en) * | 2008-05-27 | 2009-12-02 | 宋乾武 | Sewage double-biomembrane deep treatment technology |
| CN105293698A (en) * | 2014-08-01 | 2016-02-03 | 蒋华 | Domestic sewage treatment method |
| CN108675451A (en) * | 2018-05-14 | 2018-10-19 | 北京工业大学 | The apparatus and method of continuous flow AO-BCO-DEAMOX advanced nitrogen dephosphorization |
Non-Patent Citations (2)
| Title |
|---|
| 吴忆宁等: "《基础环境化学工程原理》", 30 June 2017, 哈尔滨工业大学出版社 * |
| 陈春光等: "《城市给水排水工程》", 31 October 2017, 西南交通大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100545103C (en) | Active sludge-biomembrane compounding integral sewage treating method and device thereof | |
| CN103936233B (en) | Artificial swamp sewage disposal denitrification process Nitrous Oxide reduces discharging Controlling System | |
| CN102775025B (en) | Municipal life wastewater treatment system with high efficiency and low energy consumption | |
| CN103936148B (en) | A kind of constant discharging varying duty SVBR sewage treatment process | |
| CN101857344B (en) | Method for treating domestic sewage by applying light ceramic suspended filler moving bed | |
| CN101575157B (en) | Method and system for treating sewage through composite tidal current artificial marsh | |
| CN204824550U (en) | A device for rural domestic sewage treatment | |
| CN103435155B (en) | Low-energy and intelligent three-dimensional ecological self-refluxing circulation nitrification method and apparatus | |
| CN107055754A (en) | A kind of circulation Zero-valent Iron biofilter of intensive treatment domestic sewage in rural areas | |
| CN102557330A (en) | An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater | |
| CN100418904C (en) | Vertical current and horizontal current integrated composite artificial wetland treatment method for treating urban sewage | |
| CN105084650A (en) | Microaeration circulation integrated sewage biological ecological processing system and method | |
| CN113321369A (en) | Tidal flow artificial wetland capable of simultaneously removing nitrogen and phosphorus | |
| CN104556378A (en) | Integrated treatment system for rural domestic sewage and process of system | |
| CN107216004B (en) | Domestic sewage treatment system and method | |
| CN204529593U (en) | A kind of integrated reacting device of domestic sewage in rural areas | |
| CN211338961U (en) | Sewage treatment device adopting down-flow type anaerobic biological filter combined process | |
| CN103435156A (en) | Low-energy and intelligent three-dimensional ecological external circulation nitrification method and apparatus | |
| CN109502917B (en) | Household buried unpowered integrated composite biological sewage treatment device and technology | |
| CN111253001A (en) | Domestic sewage treatment device and treatment method thereof | |
| CN103435157A (en) | Low-energy and intelligent three-dimensional ecological internal circulation nitrification method and apparatus | |
| CN2616530Y (en) | Micro-power domestic sewage treatment integrating apparatus | |
| CN102617002B (en) | Method for treating dispersed domestic sewage | |
| CN110451723B (en) | Mixed filler fluidization pool coupling constructed wetland sewage advanced treatment unit | |
| CN211111559U (en) | Be applied to rural sewage treatment's water treatment facilities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210629 |