CN113880239A - Aeration power transverse internal circulation infinite AO denitrification system and process - Google Patents
Aeration power transverse internal circulation infinite AO denitrification system and process Download PDFInfo
- Publication number
- CN113880239A CN113880239A CN202111316489.XA CN202111316489A CN113880239A CN 113880239 A CN113880239 A CN 113880239A CN 202111316489 A CN202111316489 A CN 202111316489A CN 113880239 A CN113880239 A CN 113880239A
- Authority
- CN
- China
- Prior art keywords
- denitrification
- zone
- sewage
- aerobic zone
- group
- 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.)
- Granted
Links
- 238000005273 aeration Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 241001453382 Nitrosomonadales Species 0.000 claims abstract description 34
- 239000010865 sewage Substances 0.000 claims description 89
- 238000005276 aerator Methods 0.000 claims description 30
- 238000005192 partition Methods 0.000 claims description 27
- 241000894006 Bacteria Species 0.000 claims description 21
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 230000001737 promoting effect Effects 0.000 claims description 4
- 239000000370 acceptor Substances 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 3
- 241000894007 species Species 0.000 claims 1
- 239000002351 wastewater Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000001580 bacterial effect Effects 0.000 abstract description 4
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 10
- 238000009434 installation Methods 0.000 description 8
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 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
- C02F3/02—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
- C02F3/28—Anaerobic digestion processes
-
- 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)
Abstract
The application provides an aeration power transverse internal circulation infinite AO denitrification system and process. The denitrification system is provided with an anoxic zone and an aerobic zone which are connected in parallel and are communicated with each other at the top and the bottom. This application make full use of the power that aerobic zone aeration systems provided, it forms unlimited multiunit screw propulsion flow state to drive rivers in the nitrogen removal system, this aerobic zone of simultaneous control and anoxic zone in rivers velocity of flow and water conservancy dwell time, make rivers circulate between the anoxic zone of AO denitrogenation unit and aerobic zone, form stable inner loop AO operating mode, screen the dominant bacterial who cultivates into nitrogen removal system with ammonia oxidizing bacteria, thereby strengthen the shortcut nitrification-denitrification route, improve system denitrification efficiency, reduce the nitrogen removal energy consumption.
Description
Technical Field
The invention relates to a sewage treatment technology, in particular to an aeration power transverse internal circulation infinite AO denitrification system and a process.
Background
At present, the mainstream biological denitrification process of a sewage treatment plant is mostly single-stage or multi-stage AO (anoxic zone + aerobic zone), wherein the process can be divided into a front-mounted denitrification biological denitrification system and a rear-mounted denitrification biological denitrification system according to the different setting positions of the anoxic zone. In practical engineering application, a preposed biological denitrification system is mostly used. The process principle is shown in figure 1.
The mechanism by which a sewage treatment plant performs biological denitrification in a conventional manner using the system of fig. 1 is shown in fig. 2: in the aerobic zone, ammonia nitrogen is oxidized into nitrite nitrogen by ammonia oxidizing bacteria, and the nitrite nitrogen is further oxidized into nitrate nitrogen by nitrite oxidizing bacteria; in the anoxic zone, nitrate nitrogen provided by the aerobic zone is sequentially reduced into nitrite nitrogen and nitrogen gas by denitrifying bacteria by utilizing a carbon source.
From the microbial flora in the nitrification stage, the biological denitrification system of the traditional sewage treatment plant promotes Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) to form a symbiotic relationship due to the overlong single-stage O section (aerobic zone), so that the shortcut nitrification-denitrification approach is weakened, and the nitrification-denitrification approach is strengthened. Because the nitrification-denitrification nitrogen removal way consumes more carbon source, the traditional biological nitrogen removal technology has the limitations of insufficient carbon source, low total nitrogen removal rate, high operation energy consumption and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an aeration power transverse internal circulation infinite AO denitrification system and process, and the invention provides an internal circulation flow state through an AO denitrification unit and compresses a nitrification-denitrification way, thereby saving the oxygen supply energy consumption of sewage treatment, promoting ammonia oxidizing bacteria to provide a shortcut nitrification-denitrification way and reducing the total nitrogen discharge amount of tail water. The invention specifically adopts the following technical scheme.
Firstly, in order to achieve the above object, an aeration power transverse internal circulation infinite AO denitrification system is provided, which comprises at least one group of AO denitrification units, wherein the AO denitrification units are arranged between a pretreatment facility and a secondary sedimentation tank, and each group of AO denitrification units respectively comprises: the water distribution channel is connected above the anoxic zone and is used for inputting sewage from a pretreatment facility into the anoxic zone; the anoxic zone is arranged at one side of the AO denitrification unit and is used for receiving sewage distributed by the water distribution channel and/or sewage discharged by the aerobic zone in the previous group of AO denitrification units, and in the anoxic zone, denitrifying bacteria use nitrite NO 2-and nitrate NO 3-in the input sewage as electron acceptors and organic matters in the sewage as electron donors for denitrification treatment; the aerobic zone is arranged on the other side of the AO denitrification unit, is communicated with the anoxic zone, receives sewage from the anoxic zone, and provides dissolved oxygen through an aeration facility arranged in the aerobic zone, so that ammonia oxidizing bacteria AOB oxidize ammonia nitrogen NH4+ in the sewage into nitrite NO 2-by using the dissolved oxygen, nitrite oxidizing bacteria NOB oxidize nitrite NO 2-into nitrate NO 3-and nitrify the sewage; and the water outlets of the middle groups of AO denitrification units are respectively connected with the anoxic zones of the next group of AO denitrification units for sequentially discharging the sewage treated by the AO denitrification unit from the anoxic zones of the next group of AO denitrification units.
Optionally, the system for aeration-powered horizontal internal circulation infinite AO denitrification as described in any one of the above, wherein the aeration facility is disposed at the bottom of the aerobic zone, and comprises: and each aerator respectively releases micro bubbles upwards from the bottom of the aerobic zone, and the bubbles upwards push the sewage to enable the sewage to transversely enter the anoxic zone at the top of the aerobic zone.
Optionally, the aeration-powered transverse-inner-circulation infinite AO denitrification system as described in any one of the above, wherein the diameter of the micro-bubbles released by the aerator at the bottom of the aerobic zone is between 0.5 mm and 2 mm.
Optionally, the system for aeration-powered transverse-inner-circulation infinite AO denitrification comprises a plurality of aerators, wherein each aerator is uniformly laid at the bottom of the aerobic zone, the aerators are communicated with each other through aeration pipelines, and the top ends of the aeration pipelines extend to a position above the sewage level along the side wall of the aerobic zone and are connected with an air supply device arranged at the top of the side wall of the aerobic zone.
Optionally, the aeration-powered horizontal internal circulation infinite AO denitrification system as described in any one of the above, wherein each group of AO denitrification units is provided with a partition between the anoxic zone and the aerobic zone, the bottom of the partition is provided with an intra-unit exchange channel, the intra-unit exchange channel communicates the anoxic zone and the aerobic zone, and in each group of AO denitrification units, sewage enters the aerobic zone from the anoxic zone through the intra-unit exchange channel.
Optionally, the aeration-powered horizontal internal circulation infinite AO denitrification system as described above, wherein the water distribution channel is disposed at a top of a sidewall of the anoxic zone, a water inlet is disposed at a bottom of the water distribution channel, sewage discharged from the pretreatment facility is injected into the anoxic zone from the water inlet at the bottom of the water distribution channel, and the sewage flows downward in the anoxic zone and enters the aerobic zone through an intra-unit exchange channel laterally disposed at the bottom; the water flow transversely entering the bottom of the aerobic zone is superposed with the vertical water flow pushed by the micro-bubbles of the aerator to form a spiral propulsion flow state.
Optionally, the system comprises an aeration-powered horizontal internal circulation infinite AO denitrification system, wherein water flow in an anoxic zone of each group of AO denitrification units flows from top to bottom, and then enters an aerobic zone on the opposite side of a partition plate of the group of AO denitrification units through an exchange channel in the unit; in the process that water flow in the aerobic zone of each group of AO denitrification units is pushed to the top of the liquid level by bubbles released by the aerator from bottom to top, water inflow in the exchange channel in the unit pushes the water flow to horizontally flow along the length direction of the AO denitrification unit pool, and then the water flow transversely crosses the partition plate at the top of the aerobic zone and overflows to the anoxic zone at the opposite side of the partition plate of the AO denitrification unit group.
Optionally, the aeration-powered horizontal internal circulation infinite AO denitrification system as described in any one of the above, wherein in each group of AO denitrification units, sewage is circulated back and forth between the anoxic zone and the aerobic zone, and each group of AO denitrification units respectively screen ammonia oxidizing bacteria into dominant bacteria in each group of AO denitrification units under the working condition of aerobic-anoxic back and forth circulation.
Meanwhile, in order to achieve the above purpose, the invention also provides an aeration power transverse internal circulation infinite AO denitrification process, which uses the system as described in any one of the above and executes the following steps: injecting sewage into a water distribution channel of each group of AO denitrification units, enabling the sewage in each group of AO denitrification units to flow from top to bottom through a water inlet, and then transversely entering the bottom of an aerobic zone in each group of AO denitrification units through an intra-unit exchange channel; adjusting the aeration intensity of an aerator at the bottom of the aerobic zone, keeping the ascending speed and the retention time of the sewage in the aerobic zone from bottom to top within the required range for promoting short-cut nitrification, pushing the sewage in each group of AO denitrification units from bottom to top to the top of the liquid level by bubbles released by the aerator, and then transversely crossing the partition plate to overflow into the anoxic zone at the opposite side of the partition plate of the group of AO denitrification units; and thirdly, after the ammonia oxidizing bacteria are screened into dominant strains in each group of AO denitrification units, opening water outlets according to a preset flow rate, and sequentially discharging the sewage treated by the AO denitrification units of the group to an anoxic zone or a secondary sedimentation tank of the next group of AO denitrification units.
Optionally, in the third step of the aeration-powered horizontal internal circulation infinite AO denitrification process, the aerobic zone 3 and the anoxic zone 2 between two adjacent groups of AO denitrification units receive and treat sewage through the water outlet and/or the water inlet arranged therebetween.
Advantageous effects
The denitrification system is provided with an anoxic zone and an aerobic zone which are connected in parallel and are communicated with each other at the top and the bottom. The utility model provides a power that aerobic zone aeration systems provided is fully utilized to drive the interior rivers of intaking of aerobic zone and form unlimited multiunit spiral propulsion flow state in denitrification system. Therefore, the flow velocity and the hydraulic retention time of water flow in the aerobic zone and the anoxic zone can be adjusted and controlled through the water inlet, the water outlet flow and the aeration size, and the water flow circulates between the anoxic zone and the aerobic zone of each group of AO denitrification units through the arrangement of the water inlet direction and the arrangement of the separation structure between the two zones to form a stable internal circulation AO working condition flow state. The AO working condition formed by the cyclic reciprocation between the anoxic zone and the aerobic zone is utilized to compress a nitrification-denitrification nitrogen removal way, so that the screening of ammonia oxidizing bacteria is promoted, the shortcut nitrification-denitrification working condition is formed, and the ammonia oxidizing bacteria are screened and cultured to become dominant strains of a nitrogen removal system, so that the shortcut nitrification-denitrification way is enhanced, and the nitrogen removal efficiency of the system is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art multistage pre-anoxic AO denitrification process;
FIG. 2 is a schematic diagram of the nitrification-denitrification and shortcut nitrification-denitrification processes employed in FIG. 1;
FIG. 3 is a schematic diagram of an aerated powered transverse internal recycle infinite AO denitrification process as provided herein;
FIG. 4 is a schematic diagram of the unit structure of the aeration power transverse internal circulation infinite AO denitrification system provided by the present application;
FIG. 5 is a schematic diagram of the short-cut nitrification-denitrification process employed in the present application.
In the drawings, 1 denotes a distribution channel; 11 denotes a canal inlet; 2 represents an anoxic zone; 21 denotes an intra-cell switching channel; 3 denotes an aerobic zone; 31 denotes an aeration pipe; and 32 denotes an aerator.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.
The meaning of "inside and outside" in the present invention means that the direction from the side wall of each group of AO denitrification units to the sewage contained therein is inside, and vice versa; and not as a specific limitation on the mechanism of the device of the present invention.
The terms "left and right" in the present invention mean that the setting direction of the water distribution channel in each group of AO denitrification units is left and the setting position of the aerobic zone is right when the user is facing the aeration power transverse internal circulation infinite AO denitrification system provided by the present application, and are not specific limitations on the mechanism of the apparatus of the present invention.
The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.
The meaning of "up and down" in the present invention means that when a user is facing the aeration power transverse internal circulation infinite AO denitrification system provided by the present application, the direction from the aerator to the water distribution channel is up, otherwise, it is down, and not specifically limiting the mechanism of the apparatus of the present invention.
FIG. 3 is a schematic diagram of an aeration-powered transverse internal circulation infinite AO denitrification system according to the present invention, which eliminates the anoxic zone and nitrification liquid reflux at the front end of the conventional A/O process, adds a gallery in the aerobic zone along the tank length direction to form the anoxic zone, communicates the anoxic zone and the aerobic zone at the top and bottom, and performs the following treatment steps on sewage by arranging at least one set of AO denitrification units in parallel between the pretreatment facility and the secondary sedimentation tank of a sewage treatment plant:
injecting sewage into each group of AO denitrification units, enabling the sewage in the anoxic zone 2 of each group of AO denitrification units to flow from top to bottom, and then entering the bottom of the aerobic zone 3 of the AO denitrification units through an intra-unit exchange channel 21 at the bottom;
secondly, adjusting the aeration intensity in the aerobic zone 3, keeping the ascending speed and the retention time of the sewage in the aerobic zone 3 from bottom to top in a range required for promoting the shortcut nitrification by bubbles input by aeration, pushing the sewage in each group of AO denitrification units from bottom to top to the top of the liquid level by the bubbles released by the aerator 32, and then transversely crossing the partition plates to overflow into the anoxic zone 2 at the opposite side of the partition plates of the group of AO denitrification units;
and thirdly, after the ammonia oxidizing bacteria are screened into dominant strains in each group of AO denitrification units, opening a water outlet according to a preset flow rate, sequentially discharging the sewage treated by the AO denitrification units of the group to the anoxic zone 2 of the next group of AO denitrification units, and discharging the sewage treated by the whole system into a secondary sedimentation tank through the anoxic zone 2 of the last group of AO denitrification units.
In the above system, in order to ensure that each group of AO denitrification units can screen and culture ammonia oxidizing bacteria into the dominant bacteria in the unit, the present application may specifically set each group of AO denitrification units to respectively include the following components as shown in fig. 4:
a water distribution channel which is arranged at the edge of one side of the AO denitrification unit tank body and is connected above the anoxic zone 2, and a water inlet is generally arranged at the bottom of the water distribution channel and is used for inputting sewage from pretreatment facilities such as a coarse grid, a fine grid, a sand basin, a primary sedimentation tank and the like into the anoxic zone 2 according to the water distribution requirement;
the anoxic zone 2 is arranged at one side of the AO denitrification unit and is used for receiving sewage distributed by the water distribution channel and/or receiving sewage discharged by the aerobic zones in the AO denitrification unit through an opening on the side wall of the anoxic zone 2, and in the anoxic zone 2, denitrifying bacteria are used for carrying out denitrification treatment by taking nitrite NO 2-and nitrate NO 3-in the sewage input by the aerobic zone 3 or a pretreatment facility as electron acceptors and taking organic matters in the sewage as electron donors;
the aerobic zone 3 is arranged on the other side of the AO denitrification unit, is communicated with the anoxic zone 2, is used for receiving sewage of the anoxic zone 2 in the same AO denitrification unit, and provides dissolved oxygen through an aeration facility arranged in the aerobic zone 3, so that ammonia oxidizing bacteria AOB in the aerobic zone can oxidize ammonia nitrogen NH4+ in the sewage into nitrite NO 2-by using the dissolved oxygen, and nitrite oxidizing bacteria NOB can oxidize nitrite NO 2-into nitrate NO 3-to carry out nitration treatment on the sewage;
and the water outlets of the AO denitrification units in the middle of the system can be respectively and directly communicated to the anoxic zone of the next AO denitrification unit group, so that the sewage treated by the unit can be provided to the next stage, and the circulating water treatment of each stage of unit is realized to adapt to the treatment scale and site requirements of different sewage plants.
In each AO denitrogenation unit of the system of this application, through the cyclic reciprocation between the AO section and overcome the operating mode that makes Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) form the symbiotic relation because of that single-stage aerobic zone overlength formed, can avoid weakening the shortcut nitrification-denitrification route because of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) symbiotic operating mode in this application, on the contrary, this application can be through the cyclic reciprocation between the AO section and strengthen the nitrification-denitrification denitrogenation route, improve system denitrification efficiency, reduce the denitrogenation energy consumption. The above-mentioned AO denitrification unit oxidizes ammonia nitrogen to nitrite nitrogen (NO2-N) by ammonia oxidizing bacteria in sewage in an aerobic zone, then nitrite oxidizing bacteria oxidizes nitrite nitrogen (NO2-N) to nitrate nitrogen, and the nitrate nitrogen is gradually reduced to nitrite nitrogen (NO2-N) and nitrogen (N2) by denitrifying bacteria in an anoxic zone under conventional techniques. Because the spiral propulsion flow state formed by aeration promotes the circulation speed of the water body between the aerobic area and the anaerobic area, so that the water body is circulated between the aerobic area and the anaerobic area in the AO denitrification unit of the application in a reciprocating manner, the application can cultivate ammonia oxidizing bacteria into dominant bacteria in sewage through the circulation process, and stably control the biochemical pool into a short-cut nitrification denitrification mode by performing full-process nitrification and denitrification from the beginning through the dominant bacteria. Under the short-cut nitrification and denitrification state, the nitrate nitrogen ratio in the pool can be greatly reduced, the denitrification efficiency of the system can be effectively improved through dominant strains, and the denitrification energy consumption is reduced.
According to the generation cycle of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) in this system there is comparatively obvious difference, can be through the oxygenation intensity of control aerobic zone, the flow ratio of water inlet and delivery port between the adjustment unit creates the living environment that is more suitable for ammonia oxidizing bacteria, thereby in lower dissolved oxygen concentration, for example in 0.9-1.2mg/L environment, with nitration process control in the nitrite nitrogen stage, carry out the denitrification under the oxygen deficiency condition afterwards, strengthen the short distance nitrification-denitrification process that figure 5 shows, thereby compare in traditional full process nitrification denitrification denitrogenation technology with the dominant bacterial that ammonia oxidizing bacteria cultivates into the nitrogen removal system: saving oxygen supply by about 25 percent, reducing denitrification energy consumption, saving carbon sources required by denitrification, improving TN removal rate and reducing sludge generation by 50 percent under the condition of a certain C/N ratio, shortening reaction time and reducing the tank volume required by nitrification and denitrification.
Further, in order to guarantee that the generated micro-bubbles of aeration in the aerobic zone can more evenly promote the circulation of water flow upwards in the tank, the present application prefers to set up the aeration facility in the bottom of aerobic zone 3, evenly lay a plurality of aerators 32 in the 3 bottoms of tank in the aerobic zone through aeration pipeline bottom intercommunication, communicate air feeder to carry aeration gas to each aerator 32 through aeration pipeline 31 top in order to upwards release the micro-bubbles through each aerator of laying in 3 bottoms of tank in the aerobic zone respectively, upwards promote sewage upflow by the micro-bubbles, set up rivers and upwards flow along with the bubbles promptly, make sewage transversely have aerobic zone to outwards spill over and get into 2 realization unit inner loop in the anoxic zone in the unit at the top in aerobic zone 3. Because the water distribution channel constantly advances to the denitrification system in water intake, promote rivers and advance along the long direction in pond, from this application can be in good oxygen district, through the rivers that transversely get into by good oxygen district bottom of the pool and the vertical rivers that aerator 32 micro-bubbles promoted superpose mutually, through the horizontal rivers of the reciprocal vertical rivers stack edge pond length direction of circulation, form the screw propulsion flow state jointly, promote to form the short distance in the pond and nitrify the denitrification operating mode, with improvement municipal sewage treatment plant denitrogenation efficiency, reduce biochemical pond pool volume, reduce denitrogenation energy consumption and medicine consumption.
The water flow circulation power is provided for the infinite AO denitrification system by driving the water flow to flow upwards through the bubbles in the aerobic zone. The vertical flow rate of the water flow is different under different aeration intensities. In a preferable implementation mode, the diameter of the micro bubbles released by the aerator 32 can be controlled to be 0.5-2 mm, so that the sewage can be oxygenated. Generally, the biochemical tank can adopt a micropore aerator to realize the process. The bubble that micropore aerator released is about 1mm, can satisfy this application to aeration intensity and vertical water velocity's requirement.
In order to facilitate the installation, maintenance and maintenance of the air supply device, the top end of the aeration pipeline 31 connected with each aerator 32 preferably extends upwards to be above the sewage level along the side wall of the aerobic zone 3 and is connected with the air supply device arranged at the top of the side wall of the aerobic zone 3.
Under other realization modes, in order to separate an anoxic zone and an aerobic zone in the pond of each AO denitrification unit, a layer of partition plate can be arranged in the pond of the AO denitrification unit along the length direction of the pond in the mode shown in figure 4, an in-unit exchange channel 21 is formed by utilizing the bottom of the partition plate, and the anoxic zone 2 and the aerobic zone 3 are communicated through the in-unit exchange channel 21, so that in the group of AO denitrification units, sewage can enter the aerobic zone 3 from the anoxic zone 2 through the in-unit exchange channel 21 at the bottom of the pond.
From this, the usable baffle of water distribution channel provides the support thereby to set up in the 2 top edges in anoxic zone of AO denitrogenation unit cell body one side on the cell wall top of the opposite anoxic zone 2, and water distribution channel bottom can set up the water inlet in order to pour into the anoxic zone with the sewage that the facility discharged in advance from top to bottom for sewage flows down in anoxic zone 2, gets into aerobic zone 3 through the interior exchange channel 21 of unit that the bottom transversely set up. The outer side of the water distribution channel can be arranged at the top of the aerobic zone of the adjacent AO denitrification unit by supporting the top of the opposite pond wall by the partition plate, and an installation channel with a sealed channel bottom is arranged at the top of the aerobic zone of the adjacent AO denitrification unit, so that an installation space of a gas supply device is provided for the aerobic zones of the adjacent AO denitrification units. The upper part of the side wall of the installation channel can be provided with an opening, and the opening is connected with an aeration pipeline 31 to convey the gas of the gas supply device to each aerator 32 to realize the aeration of the water body in the aerobic zone.
The intra-unit exchange channel 21 inside the AO denitrification unit can be realized by a water flow exchange through hole arranged at the bottom of the partition plate. Water body exchange between adjacent AO denitrification units can be realized through a water inlet and a water outlet which are arranged on the side wall of the tank body. The arrangement positions and the arrangement modes of the water inlet and the water outlet on the side part of the tank wall are not particularly limited, and the water exchange through holes are similar to the water flow exchange through holes on the bottom of the partition plate and only need to be provided with water body exchange channels. Generally, the partition plates and the distribution channels 1 may be respectively disposed at both sides of the anoxic zone 2 along the length direction of the anoxic zone 2, and the water inlets and the in-cell exchange channels 21 may be respectively arranged in plural along the length or width direction of the anoxic zone 2. Therefore, water body exchange is realized between two adjacent groups of AO denitrification units through the sequential cascade of the water outlets and/or water inlets arranged in the tank walls of the two AO denitrification units, and the water body exchange is realized through the in-unit exchange channel 21 arranged at the bottom of the partition plate between the aerobic zone 3 and the anoxic zone 2 in the same AO denitrification unit. The liquid level height in the anoxic zone and the aerobic zone is higher than the top of the partition plate so as to facilitate the circulation of sewage in the unit, and the height of the water inlet at the bottom of the water distribution channel is lower than the liquid level height of the anoxic zone so as to avoid bubbles mixed in the downward flowing process of sewage. The water distribution channel 1 and the installation channel providing the installation space of the air supply device can be arranged on the pool wall back to back between two adjacent units, so that the bottoms of the water distribution channel 1 and the installation channel are all positioned below the liquid level, the aeration pipeline 31 is connected through an opening arranged on the side wall of the installation channel, the height of the opening exceeds the liquid level, and a sealing device can be arranged to prevent water flow from splashing to influence the operation of the equipment.
Under some preferred implementation modes, the flow velocity and the flow rate of the water body can be adjusted by arranging the regulating valves at the positions of the water inlet and the water outlet, so that the short-cut nitrification and denitrification working condition is better promoted, and the ammonia oxidizing bacteria are screened into the dominant bacteria in each group of AO denitrification units more quickly.
In each group of AO denitrification units, water flow in the anoxic zone 2 is firstly input from a water inlet at the bottom of the water distribution channel and a water inlet at the side part of the anoxic zone pool wall, flows from top to bottom in the anoxic zone, and then transversely enters the aerobic zone 3 at the opposite side of the partition plate of the group of AO denitrification units through an exchange channel 21 at the bottom of the unit; the water flow in the aerobic zone 3 is pushed to the top of the liquid level by the bubbles released by the aerator 32 from bottom to top, and in the process, the water flow is pushed to horizontally flow along the rectangle of the AO denitrification unit pool by the water inlet in the exchange channel 21 in the unit, finally transversely crosses the partition plate at the top of the aerobic zone to overflow and return to the anoxic zone 2 at the opposite side of the partition plate of the AO denitrification unit group to form an infinite group of spiral propelling flow state, or part of water is discharged to the anoxic zone of the next unit through the water outlet at the side wall of the aerobic zone pool body or is discharged to the secondary sedimentation pool through the water outlet at the side part of the pool body of the last AO denitrification unit group according to the water discharge proportion and the hydraulic retention time. In each group of AO denitrification units, sewage circulates back and forth between an anoxic zone 2 and an aerobic zone 3, under the working condition of aerobic-anoxic-back circulation, ammonia nitrogen in a water body is oxidized into nitrite nitrogen by ammonia oxidizing bacteria AOB in the aerobic zone, short-range nitrification of the ammonia nitrogen is realized, organic matters in the sewage are utilized to perform denitrification in the anoxic zone after water flow reaches the top of the aerobic zone and transversely enters the anoxic zone, short-range denitrification is realized by setting the flow velocity of the water flow and the hydraulic retention time, and the circulation is repeated in such a way, and the ammonia oxidizing bacteria are respectively screened as dominant strains in the units in each group of AO denitrification units. From this, after screening ammonia oxidizing bacteria for the dominant bacterial in each group AO denitrogenation unit, the system of this application can open the delivery port according to predetermineeing the velocity of flow, and the anoxic zone 2 drainage of a set of AO denitrogenation unit is gone down to step by step in proper order through each AO denitrogenation unit delivery port, gets rid of to the secondary sedimentation pond row through the delivery port of last one-level AO denitrogenation unit until sewage, accomplishes the denitrogenation of this system to sewage and handles.
In the system, each AO denitrification unit can be cascaded step by step through a water inlet and a water outlet of the tank wall, and sewage input of each group of AO denitrification units is respectively scheduled through a water distribution channel, so that each group of AO denitrification units can realize relatively independent and cyclic reciprocating AO treatment working conditions in a parallel connection mode. The application can flexibly adjust the number of the AO denitrification units according to sewage treatment requirements and site requirements, and the internal circulation times and the internal circulation period of each group of AO denitrification units, thereby flexibly setting the AO denitrification working condition. In engineering application, the traditional biological denitrification system can only form a fixed single-stage or multi-stage AO denitrification working condition generally according to the structural arrangement of a biochemical pool, and the invention can form an infinite plurality of AO denitrification working conditions in the same denitrification system by setting the internal circulation state of an AO denitrification unit. The unit inner loop mode that this application adopted can be favorable to improving system's denitrogenation efficiency, and more does benefit to the flexibility and sets up the denitrogenation system.
The invention fully utilizes the power provided by the aeration system to drive water flow to form an infinite number of spiral propulsion flow states in the biochemical pool, controls the rising flow rate and the hydraulic retention time of the water flow in the aerobic zone, and utilizes the AO working condition of the cyclic reciprocation formed by each unit in the system to realize the screening of ammonia oxidizing bacteria, thereby forming the short-cut nitrification and denitrification working condition.
Therefore, under the same treatment capacity, compared with the traditional AO denitrification system aiming at urban sewage, the aeration power horizontal internal circulation infinite AO denitrification process provided by the application can control the aeration intensity (determining a proper air-water ratio and an aeration form), the water flow rising speed and the retention time in the aerobic zone so as to meet the process parameters required by short-range nitrification, prevent nitrite nitrogen from being further oxidized into nitrate nitrogen as far as possible, and circulate the nitrite nitrogen into the anoxic zone to complete the short-range denitrification. In addition, the system of this application still can be through controlling the sludge age, by AO alternate operation's environment help restrain nitrous acid oxidizing bacteria's growth, make activated sludge under unlimited a plurality of cyclic reciprocating's AO operating mode, screen ammonia oxidizing bacteria into biological nitrogen removal system's dominant bacterial, thereby further strengthen short distance nitrification denitrification, with the characteristics of utilizing short distance nitrification denitrification lower oxygen consumption rate, higher COD conversion rate and shorter reaction duration, show improvement nitrogen removal rate, make municipal sewage denitrogenation efficiency reach earth's surface level IV class (TN is less than or equal to 12mg/L), reduce denitrogenation system operation energy consumption and activated sludge output, reduce the required pond volume of denitrogenation, reduce engineering cost. The wireless AO circulation denitrogenation technology that this application provided can have showing effect to the processing ability of the submerged sewage of stock sewage treatment plant.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (10)
1. The utility model provides an unlimited AO denitrogenation system of aeration power horizontal inner loop which characterized in that, includes at least a set of AO denitrogenation unit, AO denitrogenation unit sets up between preliminary treatment facility and two heavy ponds, and each group AO denitrogenation unit is equallyd divide and is included respectively:
the water distribution channel is connected above the anoxic zone (2) and is used for inputting sewage from a pretreatment facility into the anoxic zone (2);
the anoxic zone (2) is arranged at one side of the AO denitrification unit and is used for receiving sewage distributed by the water distribution channel and/or sewage discharged by the aerobic zone in the previous group of AO denitrification units, and in the anoxic zone (2), denitrifying bacteria use nitrite (NO2-) and nitrate (NO3-) in input sewage as electron acceptors and organic matters in the sewage as electron donors for denitrification treatment;
the aerobic zone (3) is arranged at the other side of the AO denitrification unit, is communicated with the anoxic zone (2), receives sewage from the anoxic zone (2), provides dissolved oxygen through an aeration facility arranged in the aerobic zone (3), enables Ammonia Oxidizing Bacteria (AOB) to oxidize ammonia nitrogen (NH4+) in the sewage into nitrite (NO2-), enables Nitrite Oxidizing Bacteria (NOB) to oxidize the nitrite (NO2-) into nitrate (NO3-), and conducts nitrification treatment on the sewage;
and the water outlets are arranged in the aerobic areas (3) of the AO denitrification units, wherein the water outlets of the last group of AO denitrification units are connected with a secondary sedimentation tank and used for discharging sewage treated by each group of AO denitrification units to the secondary sedimentation tank after the ammonia oxidizing bacteria are screened into dominant bacteria in each group of AO denitrification units, and the water outlets of the middle groups of AO denitrification units are respectively connected with the anoxic areas of the next group of AO denitrification units.
2. An aerated powered transverse internal recycle infinite AO denitrification system as in claim 1 wherein the aeration means is located at the bottom of the aerobic zone (3) comprising: and the aerators (32) respectively release micro bubbles upwards from the bottom of the aerobic zone (3), and the bubbles push the sewage upwards so that the sewage transversely enters the anoxic zone (2) at the top of the aerobic zone (3).
3. An aerated powered transverse internal recycle infinite AO denitrification system as in claim 2 wherein the micro bubbles released by the aerator (32) at the bottom of the aerobic section (3) have a diameter between 0.5 and 2 mm.
4. An aeration-powered transverse internal circulation infinite AO denitrification system as defined in claim 2 wherein each of said aerators (32) is uniformly laid on the bottom of the aerobic zone (3), each of said aerators (32) is interconnected by an aeration conduit (31), the top of said aeration conduit (31) extends above the sewage level along the side wall of the aerobic zone (3) and is connected to a gas supply means disposed on the top of the side wall of the aerobic zone (3).
5. An aeration-powered transverse internal circulation infinite AO denitrification system according to claim 2 wherein each set of AO denitrification units is provided with a partition between the anoxic zone (2) and the aerobic zone (3), the bottom of the partition is provided with an intra-unit exchange channel (21), the intra-unit exchange channel (21) communicates the anoxic zone (2) and the aerobic zone (3), and in each set of AO denitrification units, sewage enters the aerobic zone (3) from the anoxic zone (2) through the intra-unit exchange channel (21).
6. An aeration-powered transverse internal circulation infinite AO denitrification system as defined in claim 5 wherein the top of the side wall of the anoxic zone (2) is provided with the water distribution channel (1), the bottom of the water distribution channel is provided with a water inlet, sewage discharged from the pretreatment facility is injected into the anoxic zone (2) from the water inlet at the bottom of the water distribution channel (1), the sewage flows downwards in the anoxic zone (2) and enters the aerobic zone (3) through the bottom transversely arranged intra-unit exchange channel (21);
the water flow transversely entering the bottom of the aerobic zone (3) is superposed with the vertical water flow pushed by the micro-bubbles of the aerator (32) to form a spiral propulsion flow state.
7. An aerated powered transverse internal recycle infinite AO denitrification system as in claim 6 wherein each group of AO denitrification units has its water stream flowing from top to bottom in the anoxic zone (2) and then transversely through the intra-unit exchange channels (21) into the aerobic zone (3) on the opposite side of the partition of the group of AO denitrification units; in the process that water flow in the aerobic zone (3) of each group of AO denitrification units is pushed to the top of the liquid level by bubbles released by the aerator (32) from bottom to top, water flow is pushed to horizontally flow along the length direction of the AO denitrification unit pool by water inflow in the exchange channel (21) in the unit, and then the water flow transversely crosses the partition plate at the top of the aerobic zone and overflows into the anoxic zone (2) at the opposite side of the partition plate of the AO denitrification unit in the group.
8. An aerated powered transverse internal recycle infinite AO denitrification system as in claim 6 wherein in each AO denitrification unit set, wastewater is recycled between the anoxic zone (2) and the aerobic zone (3) and each AO denitrification unit set screens ammonia oxidizing bacteria as dominant species in each AO denitrification unit set under the operating conditions of the aerobic and anoxic recycle cycle.
9. An aerated powered transverse internal recycle infinite AO denitrogenation process, characterized by the use of a system according to any of claims 1 to 8, performing the following steps:
firstly, injecting sewage into a water distribution channel (1) of each group of AO denitrification units, enabling the sewage in each group of AO denitrification units to flow from top to bottom through a water inlet, and then transversely entering the bottom of an aerobic zone (3) in each group of AO denitrification units through an intra-unit exchange channel (21);
secondly, adjusting the aeration intensity of an aerator (32) at the bottom of the aerobic zone (3), keeping the ascending speed and the retention time of the sewage from bottom to top in the aerobic zone (3) within the required range for promoting short-cut nitrification, pushing the sewage in each group of AO denitrification units from bottom to top to the top of the liquid level by bubbles released by the aerator (32), and then transversely crossing the partition plates to overflow into the anoxic zone (2) at the opposite side of the partition plates of the group of AO denitrification units;
and thirdly, after the ammonia oxidizing bacteria are screened into dominant strains in each group of AO denitrification units, opening water outlets according to a preset flow rate, and sequentially discharging the sewage treated by the AO denitrification units of the group to an anoxic zone (2) or a secondary sedimentation tank of the next group of AO denitrification units.
10. An aerated powered transverse internal recycle infinite AO denitrogenation process according to claim 9 wherein in the third step the aerobic (3) and anoxic (2) zones between two adjacent sets of AO denitrogenation units are circulating sewage through water outlet and/or water inlet arranged in between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316489.XA CN113880239B (en) | 2021-11-08 | 2021-11-08 | Aeration power horizontal internal circulation infinite AO denitrification system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316489.XA CN113880239B (en) | 2021-11-08 | 2021-11-08 | Aeration power horizontal internal circulation infinite AO denitrification system and process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113880239A true CN113880239A (en) | 2022-01-04 |
| CN113880239B CN113880239B (en) | 2023-12-22 |
Family
ID=79017558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111316489.XA Active CN113880239B (en) | 2021-11-08 | 2021-11-08 | Aeration power horizontal internal circulation infinite AO denitrification system and process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113880239B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116534988A (en) * | 2023-07-06 | 2023-08-04 | 山东纯江环境科技有限公司 | Process for removing nitrate nitrogen from surface water |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202246337U (en) * | 2011-10-08 | 2012-05-30 | 王全勇 | Multistage synchronous denitrifying efficient biological denitrification system |
| CN104528934A (en) * | 2014-12-04 | 2015-04-22 | 浙江清华长三角研究院 | Shortcut nitrification-denitrification membrane bioreactor and sewage treatment technology thereof |
| CN106430575A (en) * | 2016-06-04 | 2017-02-22 | 北京工业大学 | Method for realizing shortcut nitrification and denitrification nitrogen removal by oxidation ditch segmental water-feeding process |
| CN110615530A (en) * | 2019-09-05 | 2019-12-27 | 中国市政工程中南设计研究总院有限公司 | High-efficiency energy-saving multi-mode enhanced denitrification sewage treatment system |
| CN112645449A (en) * | 2020-12-12 | 2021-04-13 | 北京工业大学 | Device and method for enhancing nitrogen and phosphorus removal by combining multistage AO short-cut denitrification coupling Anammox with sludge hydrolysis acidification |
-
2021
- 2021-11-08 CN CN202111316489.XA patent/CN113880239B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202246337U (en) * | 2011-10-08 | 2012-05-30 | 王全勇 | Multistage synchronous denitrifying efficient biological denitrification system |
| CN104528934A (en) * | 2014-12-04 | 2015-04-22 | 浙江清华长三角研究院 | Shortcut nitrification-denitrification membrane bioreactor and sewage treatment technology thereof |
| CN106430575A (en) * | 2016-06-04 | 2017-02-22 | 北京工业大学 | Method for realizing shortcut nitrification and denitrification nitrogen removal by oxidation ditch segmental water-feeding process |
| CN110615530A (en) * | 2019-09-05 | 2019-12-27 | 中国市政工程中南设计研究总院有限公司 | High-efficiency energy-saving multi-mode enhanced denitrification sewage treatment system |
| CN112645449A (en) * | 2020-12-12 | 2021-04-13 | 北京工业大学 | Device and method for enhancing nitrogen and phosphorus removal by combining multistage AO short-cut denitrification coupling Anammox with sludge hydrolysis acidification |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116534988A (en) * | 2023-07-06 | 2023-08-04 | 山东纯江环境科技有限公司 | Process for removing nitrate nitrogen from surface water |
| CN116534988B (en) * | 2023-07-06 | 2023-09-26 | 山东纯江环境科技有限公司 | Process for removing nitrate nitrogen from surface water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113880239B (en) | 2023-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021036458A1 (en) | Efficient self-circulation biological denitrification device and working method therefor | |
| CN104528934B (en) | Short-cut nitrification-denitrification denitrogenation membrane bioreactor and sewage treatment process thereof | |
| CN102180543B (en) | Highly-efficient stable bio-doubling sewage treatment device | |
| CN104512963B (en) | A kind of multistage simultaneous nitrification-denitrification biofilm system denitrogenation method of integral type and device | |
| CN205258127U (en) | Circulatory flow loop type multistage sludge -biofilm intergrowth combined type bioreactor | |
| CN201990538U (en) | Saprobia treatment pond | |
| CN106315853A (en) | Oxidation ditch membrane bioreactor, wastewater treatment process and application thereof | |
| CN202246337U (en) | Multistage synchronous denitrifying efficient biological denitrification system | |
| CN206970300U (en) | Nitrification liquid reflux and biological reaction pool for biological reaction pool | |
| CN105036332B (en) | One kind alternating internal circulation biological filter sewage-treatment plant and its application method | |
| CN114751518B (en) | Alternate aerobic-anaerobic integrated biological treatment device, method and application | |
| CN101823814A (en) | Method and system of integrated denitrifying phosphorus and nitrogen removal | |
| CN109368782A (en) | One kind strengthening continuous flow process sewerage short-cut nitration method and system based on effluent SBR | |
| CN114516683A (en) | Multi-process sewage nitrogen and phosphorus removal system and method based on aeration unpowered backflow | |
| CN101628775B (en) | Improved Carrousel oxidation ditch | |
| CN113880239B (en) | Aeration power horizontal internal circulation infinite AO denitrification system and process | |
| CN110171904A (en) | Based on continuous flow AAO dephosphorization and part denitrogenation series hybrid fixed biofilm activated sludge autotrophic denitrification device and method | |
| CN112607862A (en) | Multistage AO sewage biochemical treatment process | |
| CN109354167B (en) | Fast starting method of high-efficiency autotrophic nitrogen removal system based on MBBR | |
| CN204298147U (en) | The multistage SND nitrogen rejection facility of a kind of integral type | |
| CN207313242U (en) | A kind of split reflux declines oxygen denitrification reactor | |
| CN216191394U (en) | Aeration power transverse internal circulation infinite AO denitrification system | |
| CN201999827U (en) | High-efficiency stable sewage treatment device with bio-doubling process | |
| CN209668887U (en) | One kind being based on New oxidation ditch associated with MABR-MBR | |
| CN109354171B (en) | High-efficiency autotrophic nitrogen removal system based on MBBR and operation method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |