CN214167474U - Air-lift oxidation ditch film bioreactor - Google Patents
Air-lift oxidation ditch film bioreactor Download PDFInfo
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- CN214167474U CN214167474U CN202022274462.6U CN202022274462U CN214167474U CN 214167474 U CN214167474 U CN 214167474U CN 202022274462 U CN202022274462 U CN 202022274462U CN 214167474 U CN214167474 U CN 214167474U
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Abstract
The utility model provides an air-lift oxidation ditch membrane bioreactor, include: the membrane bioreactor comprises an integrated membrane box, a first oxidation ditch and a second oxidation ditch are arranged in the integrated membrane box, the first oxidation ditch and the second oxidation ditch are separated by a partition plate, membrane bioreactors are respectively arranged in the first oxidation ditch and the second oxidation ditch, and the membrane bioreactors of the first oxidation ditch and the membrane bioreactors of the second oxidation ditch are oppositely arranged; the bottom end of each membrane bioreactor is provided with a gas impeller; and opening and closing gate valves are respectively arranged on the partition plates corresponding to the membrane bioreactor. The air-lift oxidation ditch membrane bioreactor of the utility model saves the power consumption, reduces the dosage of the medicament and improves the utilization rate; the investment of equipment and facilities is reduced, the maintenance cost and the maintenance requirement in the future are reduced, and the operation and the management are convenient; and the membrane bioreactor can be cleaned on the premise of not stopping the sewage treatment work.
Description
Technical Field
The utility model relates to a sewage treatment and purification technology field especially relates to an air-lift oxidation ditch membrane bioreactor.
Background
The oxidation ditch is one of activated sludge methods in sewage treatment technology, the structure of the oxidation ditch is in a closed non-terminal ditch shape, and the oxidation ditch enables sewage and mixed liquid to circularly flow and aerate in an annular ditch through a rotary brush (or a rotary disc and other mechanical aeration equipment); some have combined underwater air diffusion devices with surface aerators or underwater air diffusion devices with underwater propellers. The aeration devices of the oxidation ditch are generally positioned, so that the dissolved oxygen concentration of the mixed liquor at the downstream of the aeration devices is higher, and the dissolved oxygen concentration gradually decreases along with the flow of water along the length of the ditch, and an obvious dissolved oxygen concentration gradient appears. An aerobic zone is formed in a zone having a high dissolved oxygen concentration, and an anoxic zone is formed in a zone having a low dissolved oxygen concentration. In the process of sewage denitrification treatment, the aerobic section oxidizes ammonia nitrogen in the sewage into nitrite and nitrate by aerobic autotrophic microorganisms (nitrification), and the anoxic section reduces the nitrite and the nitrate into nitrogen by heterotrophic microorganisms (denitrification). Therefore, the oxidation ditch process can realize nitrification and denitrification in the same structure.
The hydraulic retention time of the aerobic section and the anoxic section in the existing oxidation ditch is calculated and designed according to the quality of inlet water, the quality of outlet water, aeration equipment, plug flow equipment and the like, the speed of water flow in the oxidation ditch is relatively constant and is difficult to adjust, so that the hydraulic retention time of the aerobic section and the anoxic section in the oxidation ditch is relatively fixed. In fact, the quality of inlet water is greatly different at different time intervals every day or in different seasons every year, and the main control mode of the oxidation ditch at present is to monitor the concentration of dissolved oxygen in the oxidation ditch to control the aeration quantity of the aeration device. Although the dissolved oxygen concentration can indicate whether the aerobic section and the anoxic section meet the requirements of the optimal metabolic environment of corresponding microorganisms, the dissolved oxygen concentration cannot reflect whether the removal degree of pollutants in water meets the requirements, particularly the requirement of denitrification, and meanwhile, the hydraulic retention time of the aerobic section and the anoxic section cannot be adjusted along with the change of water quality, so that the over-aeration condition can occur, and energy is wasted; or the aeration is insufficient, and the effluent quality exceeds the standard.
In addition, in the prior art, the membrane flux of membrane filaments in the membrane bioreactor is reduced after the membrane filaments are used for a certain time, and the membrane is required to be maintained in an online chemical membrane washing process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, not enough to prior art provides an easy operation, and equipment is few the fault rate is low, energy saving and consumption reduction, and space utilization is high, solves rural scattered domestic sewage and collects, transports a difficult problem, can realize the air lift formula oxidation ditch membrane bioreactor who handles on the spot
The utility model discloses the technical problem that solve is realized through following technical scheme:
the utility model provides an air-lift oxidation ditch membrane bioreactor, include: the membrane bioreactor comprises an integrated membrane box, a first oxidation ditch and a second oxidation ditch are arranged in the integrated membrane box, the first oxidation ditch and the second oxidation ditch are separated by a partition plate, membrane bioreactors are respectively arranged in the first oxidation ditch and the second oxidation ditch, and the membrane bioreactors of the first oxidation ditch and the membrane bioreactors of the second oxidation ditch are oppositely arranged; the bottom end of each membrane bioreactor is provided with a gas impeller; the partition board is provided with an opening-closing gate valve corresponding to the membrane bioreactor respectively; when the gate valves of the first oxidation ditch and the second oxidation ditch are opened simultaneously, the first oxidation ditch sequentially forms a first upflow aerobic zone, a first overflow anoxic zone and a first downflow anaerobic zone according to the water flow direction, and the second oxidation ditch sequentially forms a second upflow aerobic zone, a second overflow anoxic zone and a second downflow anaerobic zone according to the water flow direction through the gate valves, so that the first oxidation ditch and the second oxidation ditch form backflow; when the gate valves of the first oxidation ditch and the second oxidation ditch are closed simultaneously, the first oxidation ditch and the second oxidation ditch respectively and independently run, wherein the first oxidation ditch sequentially forms a first upflow aerobic zone, a first overflow anoxic zone and a first downflow anaerobic zone according to the water flow direction to form backflow; and the second oxidation ditch sequentially forms a second upflow aerobic zone, a second overflow anoxic zone and a second downflow anaerobic zone according to the water flow direction to form backflow.
Preferably, the membrane bioreactor comprises: the biological membrane bioreactor comprises a biological membrane group and a guide plate arranged at the top end of the membrane bioreactor, wherein the lower end of the biological membrane group is provided with an aeration tank, and the aeration tank is connected with a gas impeller.
Preferably, the method further comprises the following steps: a liquid medicine mixer arranged at the bottom end of the membrane bioreactor.
The air-lift oxidation ditch membrane bioreactor of the utility model saves the power consumption, reduces the dosage of the medicament and improves the utilization rate; the investment of equipment and facilities is reduced, the maintenance cost and the maintenance requirement in the future are reduced, and the operation and the management are convenient; and the membrane bioreactor can be cleaned on the premise of not stopping the sewage treatment work.
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a top view of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a membrane bioreactor according to an embodiment of the present invention;
FIG. 3 is a schematic view of an embodiment of the present invention;
FIG. 4 is a schematic view of the operation of the second embodiment of the gas stripping type oxidation ditch membrane bioreactor of the present invention.
Detailed Description
Example one
FIG. 1 is a top view of an embodiment of the present invention. As shown in fig. 1, the utility model provides a gas stripping type oxidation ditch membrane bioreactor, which comprises: integration membrane case 1 be provided with first oxidation ditch and second oxidation ditch in the integration membrane case, first oxidation ditch and second oxidation ditch pass through baffle 11 and separate first oxidation ditch with be provided with membrane bioreactor 12 in the second oxidation ditch respectively, and the membrane bioreactor position of first oxidation ditch and the membrane bioreactor position of second oxidation ditch sets up in opposite directions. And opening and closing gate valves 13 are respectively arranged on the partition plates 11 corresponding to the membrane bioreactor 12. Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a membrane bioreactor according to an embodiment of the present invention. As shown in FIG. 2, the membrane bioreactor 12 comprises: a biological membrane group 123 and a guide plate 124 arranged at the top end of the membrane bioreactor; the guide plate 124 and the gate valve 13 are started or closed through a gate 125; an aeration tank 126 is also arranged at the lower end of the biological membrane group 123; in addition, a gas impeller 121 and a liquid medicine mixer 122 are arranged at the bottom end of each membrane bioreactor 12, and the gas impeller 121 is connected with an aeration tank 126. The bottom of the membrane bioreactor 12 is additionally provided with the gas flow impeller 121, and gas passes through the membrane box aeration tank to make water flow disturbance upwards through the fluid mechanics principle at the position of the lower part of the closed membrane bioreactor 12, so that the membrane filament cleaning strength is enhanced, and the cleaning effect of the membrane filaments in use is effectively improved. The gas impeller 121 is used as an auxiliary device, and mainly plays a role in stirring the dead corners of the membrane bioreactor 12 in the first oxidation ditch and the second oxidation ditch, so as to prevent the sludge from settling and accumulating, and the gas supply pipeline is connected with the aeration tank 126 of the membrane bioreactor through a pipeline and regulates the gas flow through a valve.
The working principle is as follows:
FIG. 3 is a schematic view of the operation of the embodiment of the present invention. As shown in fig. 3, when the gate valves 13 of the first oxidation ditch and the second oxidation ditch are opened simultaneously, the first oxidation ditch forms a first upflow aerobic zone, a first overflow anoxic zone and a first downflow anaerobic zone in sequence according to the water flow direction, and the gate valves are opened and closed to form a second upflow aerobic zone, a second overflow anoxic zone and a second downflow anaerobic zone in sequence according to the water flow direction in the second oxidation ditch, so that the first oxidation ditch and the second oxidation ditch form backflow.
Further, the gas-water mixed solution forms a first upflow aerobic zone at the upper side of the membrane box, the sewage is sequentially pushed to the first overflow anoxic zone and the first downflow anaerobic zone by the guiding action of the guide plate 124 of the membrane bioreactor 12, and then flows to the second oxidation ditch through the opening-closing gate valve 13 at the second oxidation ditch (because the membrane bioreactor 12 of the second oxidation ditch also plays a drainage role in the closed ascending state of the gas-water mixed solution), and at the moment, the same sewage flow circulation effect (from the upflow aerobic zone to the overflow anoxic zone to the downflow anaerobic zone) is achieved in the second oxidation ditch zone and the first oxidation ditch zone, so that the purpose of the whole sewage circulation of the first oxidation ditch and the second oxidation ditch is achieved.
It should be noted that, the liquid levels of the first oxidation ditch and the second oxidation ditch reach the calibration position, the aeration scrubbing of the membrane bioreactor 12 forms a liquid level difference as the power of backflow and plug flow by adjusting the air quantity of the aeration tank 126 (the liquid level in the area rises under the action of atmospheric pressure and the principle of gravity acceleration in the first oxidation ditch and the second oxidation ditch due to bottom aeration, so as to realize regional high liquid level), the liquid level difference and the flow rate of sewage circulation in the tank are determined by the aeration quantity and the height adjustment of the partition board arranged between the first oxidation ditch and the second oxidation ditch, the upflow area of the membrane bioreactor 12 is used as an aerobic area, the overflow area is used as an anoxic area, and the overflow area automatically flows to the downflow area, namely the mixed liquid anoxic area, so that the plug flow device and the backflow pump are saved.
Example two
In the prior art, the condition that the membrane flux is reduced can appear after membrane filaments in the membrane bioreactor are used for a certain time, and the maintenance of an online chemical membrane washing is needed at this time. In the embodiment, the membrane bioreactor can be cleaned on the premise of not stopping the sewage treatment work.
FIG. 4 is a schematic view of the operation of the second embodiment of the gas stripping type oxidation ditch membrane bioreactor of the present invention. As shown in FIG. 4, the present embodiment has the same structure as the first stripping type oxidation ditch membrane bioreactor, except that: when the gate valves 13 of the first oxidation ditch and the second oxidation ditch are closed simultaneously, the first oxidation ditch or the second oxidation ditch sequentially forms a first upflow aerobic zone or a second upflow aerobic zone, a first overflow anoxic zone or a second overflow anoxic zone, and a first downflow anaerobic zone or a second downflow anaerobic zone according to the water flow direction to form backflow.
Specifically, when the gate valve 13 is opened and closed simultaneously, the first oxidation ditch or the second oxidation ditch forms the form of independent process operation at the moment; the gas-water mixed liquor formed by the aeration tank 126 in the membrane bioreactor 12 flows upwards to the aerobic zone of the overflow anoxic zone, then flows downwards to the tail end of the oxidation ditch, and forms the independent water area circulation of the first oxidation ditch or the second oxidation ditch under the principle of reaction force.
In this embodiment, a group of high-differential-pressure-value optimum is cleaned on line without producing water, the gate valves 13 for opening and closing the first oxidation ditch and the second oxidation ditch are closed, so that the first oxidation ditch or the second oxidation ditch form an independent area, and the chemicals are injected into the biological membrane sheet set 123 through the chemical liquid mixer 122, so as to achieve the purpose of cleaning membrane filaments on line and improving membrane flux. When the first oxidation ditch or the second oxidation ditch is in on-line membrane washing operation, the second oxidation ditch or the first oxidation ditch can normally run, and the running environment is that the membrane bioreactor 12 scrubs and aerates to form a liquid level difference as the power of backflow and plug flow to form independent area circulation so as to realize the purpose of normal production and running of the first oxidation ditch or the second oxidation ditch.
The air-lift oxidation ditch membrane bioreactor of the utility model saves the power consumption, reduces the dosage of the medicament and improves the utilization rate; the investment of equipment and facilities is reduced, the maintenance cost and the maintenance requirement in the future are reduced, and the operation and the management are convenient; and the membrane bioreactor can be cleaned on the premise of not stopping the sewage treatment work.
Claims (3)
1. An air-stripping oxidation ditch membrane bioreactor, comprising: the membrane bioreactor comprises an integrated membrane box, a first oxidation ditch and a second oxidation ditch are arranged in the integrated membrane box, the first oxidation ditch and the second oxidation ditch are separated by a partition plate, membrane bioreactors are respectively arranged in the first oxidation ditch and the second oxidation ditch, and the membrane bioreactors of the first oxidation ditch and the membrane bioreactors of the second oxidation ditch are oppositely arranged; the bottom end of each membrane bioreactor is provided with a gas impeller;
the partition board is provided with an opening-closing gate valve corresponding to the membrane bioreactor respectively;
when the gate valves of the first oxidation ditch and the second oxidation ditch are opened simultaneously, the first oxidation ditch sequentially forms a first upflow aerobic zone, a first overflow anoxic zone and a first downflow anaerobic zone according to the water flow direction, and the second oxidation ditch sequentially forms a second upflow aerobic zone, a second overflow anoxic zone and a second downflow anaerobic zone according to the water flow direction through the gate valves, so that the first oxidation ditch and the second oxidation ditch form backflow;
when the gate valves of the first oxidation ditch and the second oxidation ditch are closed simultaneously, the first oxidation ditch and the second oxidation ditch respectively and independently run, wherein the first oxidation ditch sequentially comprises a first upflow aerobic zone, a first overflow anoxic zone and a first downflow anaerobic zone according to the water flow direction and forms backflow; the second oxidation ditch is sequentially provided with a second upflow aerobic zone, a second overflow anoxic zone and a second downflow anaerobic zone according to the water flow direction and forms reflux.
2. The air-lift oxidation ditch membrane bioreactor of claim 1, wherein the membrane bioreactor comprises: the biological membrane bioreactor comprises a biological membrane group and a guide plate arranged at the top end of the membrane bioreactor, wherein the lower end of the biological membrane group is provided with an aeration tank, and the aeration tank is connected with a gas impeller.
3. The air-stripping oxidation ditch membrane bioreactor of claim 1, further comprising: a liquid medicine mixer arranged at the bottom end of the membrane bioreactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022274462.6U CN214167474U (en) | 2020-10-13 | 2020-10-13 | Air-lift oxidation ditch film bioreactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022274462.6U CN214167474U (en) | 2020-10-13 | 2020-10-13 | Air-lift oxidation ditch film bioreactor |
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| Publication Number | Publication Date |
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| CN214167474U true CN214167474U (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022274462.6U Active CN214167474U (en) | 2020-10-13 | 2020-10-13 | Air-lift oxidation ditch film bioreactor |
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| CN (1) | CN214167474U (en) |
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- 2020-10-13 CN CN202022274462.6U patent/CN214167474U/en active Active
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