CN114349163B - Starting method for treating domestic sewage based on A/O biological membrane-MBR process - Google Patents
Starting method for treating domestic sewage based on A/O biological membrane-MBR process Download PDFInfo
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- CN114349163B CN114349163B CN202111676830.2A CN202111676830A CN114349163B CN 114349163 B CN114349163 B CN 114349163B CN 202111676830 A CN202111676830 A CN 202111676830A CN 114349163 B CN114349163 B CN 114349163B
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Abstract
The invention discloses a method for starting treatment of domestic sewage based on an A/O (anaerobic/anoxic/oxic) biological membrane-MBR (membrane biological reactor) process. The method mainly comprises the following steps: (1) a sewage water injection stage, (2) a sludge inoculation stage, (3) a mixing stage and (4) a continuous operation stage. Compared with the prior art, the method provided by the invention has the advantages of small addition amount of sludge, small amount of residual sludge, no need of additional addition of nutrient substances, simplicity in operation, no need of long-time residence of personnel, good treatment effect and the like, and is suitable for debugging and starting the treatment of high-concentration domestic sewage in remote dispersed areas on a large scale based on the A/O biological membrane-MBR process.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a starting method for treating domestic sewage based on an A/O (anaerobic/anoxic/oxic) biological membrane-MBR (membrane bioreactor) process, which is suitable for small and miniature high-concentration domestic sewage in a dispersed area.
Background
With the improvement of the living standard of people, the water pollution problem is increasingly gaining attention. Sewage in remote decentralized areas such as expressway service areas and toll stations has a small water amount but a high pollutant concentration. In order to prevent the damage to the surrounding ecological environment, a sewage treatment device is required to be arranged.
At present, the small and miniature high-concentration domestic sewage in remote dispersed areas is mostly purified by a microbiological method. Wherein the A/O biological membrane-MBR process is a process form combining an anoxic-aerobic biological membrane process and an MBR process. The process has the characteristics of long and controllable sludge retention time, stable water quality of effluent, clear water quality, small dosage when being used for reclaimed water recycling, difficult blockage of recycling pipelines and the like, and is a common process for treating small and miniature high-concentration domestic sewage in remote dispersed areas.
The sewage treatment by the microbial method is carried out by screening and directional culture of dominant bacteria of microbial strains so that the microbial strains meet the sewage treatment requirement. Therefore, a certain start-up time is required for a new sewage treatment plant.
The existing sewage treatment equipment for the dispersed areas is mainly started by adopting two modes of a natural culture method and a sludge inoculation method. The natural culture method utilizes the microorganism carried by the sewage to culture the sludge, has the advantages of simple operation, strong pertinence of the cultured sludge to the sewage and the like, but the method has long culture period, and the effluent which does not reach the standard during the culture period can damage the surrounding ecological environment. The sludge inoculation method realizes directional culture of microorganisms by inoculating external sludge or adding microorganism strains, and has the defects of short starting time, long adaptation time of sludge and the existing water quality, need to add nutrient substances for regulation and control and the like. The operation is more complicated, the personnel residence time is longer, the material consumption is higher, the microbial strain is expensive, and the method is not suitable for the debugging work of small and miniature domestic sewage in remote scattered areas.
At present, although the A/O biological membrane-MBR process is generally applied to treating small and miniature high-concentration domestic sewage in remote dispersed areas, the problems of easy blockage of the MBR membrane, large residual sludge amount, high sludge discharge frequency, complex operation and maintenance and the like caused by too much or too little sludge inoculation amount still exist, and the development and application of the A/O biological membrane-MBR process are greatly limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a starting method for treating domestic sewage based on an A/O biological membrane-MBR process. By organically combining the advantages of the natural culture method and the sludge inoculation method, the problems of complex starting operation and poor feasibility of small and miniature high-concentration domestic sewage in remote and dispersed areas in the A/O biological membrane-MBR process treatment are effectively solved, and the method has the advantages of small sludge addition amount, no need of additional nutrient substances, simplicity in operation, good treatment effect and the like.
A method for starting treatment of domestic sewage based on an A/O (anaerobic/anoxic/oxic) biological membrane-MBR (membrane biological reactor) process is suitable for small and miniature high-concentration domestic sewage in a dispersed area, and comprises the following steps of:
(1) And (3) sewage water injection stage: filling raw sewage to be treated into an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank, and aerating for a period of time;
(2) Sludge inoculation stage: after the step (1) is finished, fresh dehydrated sludge with a certain weight is pulled from an urban domestic sewage treatment plant to serve as inoculated sludge, and the pulled dehydrated sludge is respectively added into an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank according to a certain proportion;
(3) Mixing: after the step (2) is completed, immediately starting an aerobic biological membrane tank fan, an MBR tank fan and an anoxic biological membrane tank stirrer, and operating for a period of time to fully and uniformly fill the sludge into the reaction tank as much as possible;
(4) Continuous operation phase: after the step (3) is finished, continuously feeding water to the reaction tank, continuously and periodically operating an MBR membrane suction water outlet pump, and starting an anoxic biological membrane tank stirrer, an aerobic biological membrane tank fan, an MBR tank fan and an aerobic biological membrane tank reflux pump, wherein the aerobic biological membrane tank fan and the aerobic biological membrane tank reflux pump are operated in an intermittent mode; the anoxic biological membrane tank stirrer and the MBR tank fan are operated in a continuous mode.
Preferably, the duration of the aeration period of step (1) is preferably from 8 to 24 hours.
Further, the dehydrated sludge obtained in the step (2) is obtained from non-medicated dehydrated sludge obtained by filter pressing of a sludge press filter of a municipal sewage treatment plant; the certain weight is the weight of the sludge calculated according to the effective volume of the aerobic biological membrane tank and the MBR tank multiplied by the unit addition amount; the unit adding amount is preferably 2-5kg of dehydrated sludge per unit effective volume; the fresh dewatered sludge is dewatered sludge generated by an internal pressure filter within 30 minutes; the sludge adding ratio is preferably 1 in an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank: 4:1.
preferably, in the step (3), the aerobic biomembrane pool fan, the MBR pool fan and the anoxic biomembrane pool stirrer are operated for a period of time of 1-2 hours.
Preferably, in the step (4), the unit cycle operation mode of the MBR membrane suction water outlet pump is that the operation is stopped for 1 minute for 3 minutes, and the suction water outlet flow is matched with the water inlet flow; the intermittent operation start-stop time ratio of the fan of the aerobic biological film pool is (1-4): 1, the ratio of aeration air quantity to water inflow is 15:1, a step of; the intermittent operation start-stop time ratio of the reflux pump of the aerobic biomembrane pool is (1-2): 1, and the reflux ratio is 200% -400%.
Compared with the prior art, the starting method for treating the small and miniature high-concentration domestic sewage in the remote dispersed area based on the A/O biological membrane-MBR process has the advantages that:
1) According to the invention, the natural culture method is organically combined with the sludge inoculation method, the advantages of strong pertinence of the sludge cultured by the natural culture method to the sewage and short starting time of the sludge inoculation method are fully utilized, and the problems of long reaction sludge domestication time, difficult starting and the like of sewage treatment equipment in remote dispersed areas are solved;
2) The method has the advantages of less sludge addition amount in the starting process, no need of adding nutrient substances, convenient operation, low material consumption, no need of long-time residence of personnel, and suitability for debugging and starting large-scale water treatment equipment in remote decentralized areas;
3) According to the invention, by balancing the growth rate and the aerobic digestion rate of the sludge in the MBR tank, the residual sludge amount generated by the process is small, the sludge discharge period is long, the problems of MBR membrane blockage, high sludge discharge frequency, complex operation and maintenance and the like caused by too much or too little sludge amount in the A/O biological membrane-MBR process tank are effectively solved, and the stable operation of small and miniature high-concentration domestic sewage treatment equipment in remote dispersed areas is facilitated.
Drawings
FIG. 1 is a flowchart of a start-up mode of the present invention.
FIG. 2 is a schematic diagram of an A/O biofilm-MBR sewage treatment device.
In the figure, a 1-regulating tank, a 2-A/O biological membrane-MBR process tank, a 3-water inlet pump, a 4-anoxic biological membrane tank stirrer, a 5-anoxic biological membrane tank, a 6-aerobic biological membrane tank, a 7-biological filler, an 8-aerobic biological membrane tank reflux pump, a 9-MBR tank, a 10-MBR membrane component, an 11-MBR membrane suction water pump, a 12-first flowmeter, a 13-second flowmeter, a 14-aerobic biological membrane tank fan and a 15-MBR tank fan.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following describes in detail the method for starting domestic sewage provided by the present invention with reference to the examples. The following examples are only illustrative of the present invention and are not intended to limit the scope of the invention.
Example 1
The invention is applied to treat sewage in a certain high-speed service area, and the water quality condition of the sewage is as follows: COD value is 403+ -100 mg/L, ammonia nitrogen concentration is 150+ -20 mg/L. The treatment process adopts an A/O biological membrane-MBR process, and the effective volume of the aerobic biological membrane tank and the MBR tank is 75m 3 。
1) And (3) sewage water injection stage: and filling the aerobic biological membrane tank, the anoxic biological membrane tank and the MBR tank with domestic sewage raw water in the service area regulating tank, starting an aeration device, and aerating the aerobic biological membrane tank and the MBR tank for 24 hours.
2) Sludge inoculation stage: after the step (1) is finished, adding 4kg of dehydrated sludge into each unit effective volume tank body, and pulling 300kg of non-medicated fresh dehydrated sludge which is filtered by a sludge filter press of a municipal sewage plant as seed sludge of reaction equipment. Dewatering sludge according to the following ratio of 1:4:1, 50kg,200kg and 50kg of dehydrated sludge are respectively added into the anoxic biological membrane tank, the aerobic biological membrane tank and the MBR tank according to the adding proportion.
3) Mixing: after the step (2) is completed, an aerobic biological membrane pool fan, an MBR pool fan and an anoxic biological membrane pool stirrer are started, and the operation is carried out for 2 hours.
4) Continuous operation phase: after the step (3) is finished, continuously feeding water into the reaction tank, wherein the water feeding amount is the average flow of the sewage actually generated in the daily service area; the membrane suction water outlet pump continuously operates according to an operation period of 3 minutes and 1 minute of stopping operation, and regulates and controls the water outlet flow and the water inlet flow of the membrane so that the water outlet flow is the same as the water inlet flow; starting an anoxic tank stirrer and an MBR tank fan and continuously running; starting an aerobic biomembrane pool fan, and adjusting the ratio of the air quantity and the water inflow of an aerobic biomembrane Chi Fengji to 15:1, stopping the intermittent operation in a 30-minute operation mode according to the operation for 60 minutes. And starting a reflux pump of the aerobic biomembrane pool, stopping running intermittently and continuously in a running mode of 60 minutes according to running for 60 minutes, and adjusting the reflux ratio to be 200 percent. After 12 days of operation, the ammonia nitrogen in the system effluent is reduced from 150+/-20 mg/L to 4.2+/-1.2 mg/L, and the COD is reduced from 403+/-100 mg/L to below 45+/-5 mg/L, which marks the successful start of the A/O biological membrane-MBR process.
While the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the present invention shall also be considered as the scope of the present invention.
Claims (5)
1. The method for starting the treatment of the domestic sewage based on the A/O biological membrane-MBR technology is suitable for small and miniature high-concentration domestic sewage in a dispersed area, and is characterized by comprising the following steps of:
(1) And (3) sewage water injection stage: filling raw sewage to be treated into an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank, and aerating for a period of time;
(2) Sludge inoculation stage: after the step (1) is finished, fresh dehydrated sludge with a certain weight is pulled from an urban domestic sewage treatment plant to serve as inoculated sludge, and the pulled dehydrated sludge is respectively added into an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank according to a certain proportion;
(3) Mixing: after the step (2) is completed, immediately starting an aerobic biological membrane tank fan, an MBR tank fan and an anoxic biological membrane tank stirrer, and operating for a period of time to fully and uniformly fill the sludge into the reaction tank as much as possible;
(4) Continuous operation phase: after the step (3) is finished, continuously feeding water to the reaction tank, continuously and periodically operating an MBR membrane suction water outlet pump, and starting an anoxic biological membrane tank stirrer, an aerobic biological membrane tank fan, an MBR tank fan and an aerobic biological membrane tank reflux pump, wherein the aerobic biological membrane tank fan and the aerobic biological membrane tank reflux pump are operated in an intermittent mode; the anoxic biological membrane tank stirrer and the MBR tank fan are operated in a continuous mode.
2. The method for starting up the treatment of domestic sewage based on the a/O biofilm-MBR process according to claim 1, wherein the duration of the aeration period in the step (1) is preferably 8-24 hours.
3. The method for starting treatment of domestic sewage based on an a/O biofilm-MBR process according to claim 2, wherein the dewatered sludge of step (2) is obtained from non-medicated dewatered sludge press-filtered by a sludge press filter of a municipal domestic sewage treatment plant; the certain weight is the weight of the sludge calculated according to the effective volume of the aerobic biological membrane tank and the MBR tank multiplied by the unit addition amount; the unit adding amount is preferably 2-5kg of dehydrated sludge per unit effective volume; the fresh dewatered sludge is dewatered sludge generated by an internal pressure filter within 30 minutes; the sludge adding ratio is preferably 1 in an anoxic biological membrane tank, an aerobic biological membrane tank and an MBR tank: 4:1.
4. the method for starting up the treatment of domestic sewage based on the a/O biofilm-MBR process according to claim 3, wherein the aerobic biofilm tank fan, the MBR tank fan and the anoxic biofilm tank agitator in the step (3) are operated for a period of time of 1 to 2 hours.
5. The method for starting the treatment of domestic sewage based on the A/O biological membrane-MBR process according to claim 4, wherein in the step (4), the unit cycle operation mode of the MBR membrane suction water outlet pump is 3 minutes of operation and 1 minute of operation, and the suction water outlet flow is matched with the water inlet flow; the intermittent operation start-stop time ratio of the fan of the aerobic biological film pool is (1-4): 1, the ratio of aeration air quantity to water inflow is 15:1, a step of; the intermittent operation start-stop time ratio of the reflux pump of the aerobic biomembrane pool is (1-2): 1, and the reflux ratio is 200% -400%.
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| WO2008093287A1 (en) * | 2007-01-30 | 2008-08-07 | Water Research Commission | Treatment of wastewaters using dual-stage membrane bioreactors |
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Patent Citations (8)
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| WO2008093287A1 (en) * | 2007-01-30 | 2008-08-07 | Water Research Commission | Treatment of wastewaters using dual-stage membrane bioreactors |
| JP2013000664A (en) * | 2011-06-17 | 2013-01-07 | Kubota Corp | Method for starting membrane separation active sludge treatment device, and sewage treatment device |
| CN104787888A (en) * | 2015-04-03 | 2015-07-22 | 兰州交通大学 | BAF (biological aerated filter) and sewage treatment method using same |
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