CN114349163A - Starting method for treating domestic sewage based on A/O (anaerobic/anoxic/oxic) biomembrane-MBR (membrane bioreactor) process - Google Patents
Starting method for treating domestic sewage based on A/O (anaerobic/anoxic/oxic) biomembrane-MBR (membrane bioreactor) process Download PDFInfo
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Abstract
The invention discloses a starting method for treating domestic sewage based on an A/O (anoxic/oxic) biomembrane-MBR (membrane bioreactor) 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 less sludge addition amount, less excess sludge amount, no need of extra addition of nutrient substances, simple operation, no need of long-time personnel stationing, good treatment effect and the like, and is suitable for debugging and starting of large-scale treatment of high-concentration domestic sewage based on the A/O biomembrane-MBR process in remote and decentralized areas.
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 (anoxic/oxic) biomembrane-MBR (membrane bioreactor) process, which is suitable for small and miniature high-concentration domestic sewage in a decentralized region.
Background
With the improvement of the living standard of people, the problem of water pollution is increasingly paid attention to by people. Although the amount of sewage in remote dispersed areas such as expressway service areas and toll stations is small, the concentration of pollutants is high. In order to prevent the damage to the surrounding ecological environment, a sewage treatment device is required to be arranged.
At present, the micro domestic sewage with high concentration in remote dispersion areas is mostly purified by a microbiological method. Wherein, the A/O biomembrane-MBR process is a process form combining an anoxic-aerobic biomembrane process and an MBR process. The process has the characteristics of long and controllable sludge retention time, stable effluent quality, clear water quality, small dosage, difficult blockage of a reuse pipeline and the like when the process is used for reusing reclaimed water, and is a common process for treating small and miniature high-concentration domestic sewage in remote dispersion areas.
The sewage treatment by the microbiological method needs to carry out screening and directional culture on 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 apparatus.
The microorganism starting of the existing sewage treatment equipment used in the decentralized region mostly adopts two modes of a natural culture method and a sludge inoculation method. The natural culture method utilizes the microorganisms carried by the sewage to carry out sludge culture, has the advantages of simple operation, strong pertinence of the cultured sludge to the sewage and the like, but 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 the directional culture of microorganisms by inoculating external sludge or adding microbial strains, has short starting time, but has the defects of longer adaptation time of the sludge to the existing water quality, need of adding nutrient substances for regulation and control and the like. The operation is complex, the personnel staying period is long, the material consumption is high, the price of microbial strains is high, and the method is not suitable for the debugging work of the micro domestic sewage in remote dispersion areas.
At present, although the A/O biomembrane-MBR process is generally applied to the treatment of small and miniature high-concentration domestic sewage in remote and dispersed areas, the problems of easy blockage of an 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 due to long starting time still exist, and the development and the application of the A/O biomembrane-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 (anoxic/oxic) biomembrane-MBR (membrane bioreactor) process. By organically combining the respective advantages of the natural culture method and the sludge inoculation method, the problems of complex starting operation and poor feasibility of the A/O biomembrane-MBR process for treating the small and miniature high-concentration domestic sewage in remote and dispersed areas are effectively solved, and the method has the advantages of small sludge adding amount, no need of adding additional nutrient substances, simple operation, good treatment effect and the like.
A starting method for treating domestic sewage based on an A/O biomembrane-MBR process is suitable for small and miniature high-concentration domestic sewage in a dispersion area, and comprises the following steps:
(1) a sewage water injection stage: filling the anoxic biomembrane pond, the aerobic biomembrane pond and the MBR pond with raw sewage to be treated, and aerating for a period of time;
(2) a sludge inoculation stage: after the step (1) is finished, conveying fresh dewatered sludge with a certain weight from an urban domestic sewage treatment plant as inoculation sludge, and respectively adding the conveyed dewatered sludge into an anoxic biomembrane pond, an aerobic biomembrane pond and an MBR pond according to a certain proportion;
(3) and (3) mixing: after the step (2) is finished, immediately starting an aerobic biomembrane pond fan, an MBR pond fan and an anoxic biomembrane pond stirrer and running for a period of time to fully and uniformly fill the sludge in the reaction pond as far as possible;
(4) a continuous operation stage: after the step (3) is finished, continuously feeding water into the reaction tank, continuously and periodically operating an MBR membrane suction water outlet pump, and starting an anoxic biomembrane tank stirrer, an aerobic biomembrane tank fan, an MBR tank fan and an aerobic biomembrane tank reflux pump, wherein the aerobic biomembrane tank fan and the aerobic biomembrane tank reflux pump operate in an intermittent manner; the anoxic biomembrane pond stirrer and the MBR pond fan operate in a continuous mode.
Preferably, the duration of the period of aeration in step (1) is preferably 8 to 24 hours.
Further, the dehydrated sludge obtained in the step (2) is obtained from non-medicated dehydrated sludge which is filter-pressed by a sludge filter press of an urban domestic sewage treatment plant; the certain weight is the weight of the sludge calculated by multiplying the effective volumes of the aerobic biomembrane tank and the MBR tank by the unit addition amount; the unit adding amount is preferably that 2-5kg of dewatered sludge is added per unit effective volume; the fresh dehydrated sludge is dehydrated sludge generated by a filter press within 30 minutes; the sludge adding proportion is preferably 1 in an anoxic biomembrane pond, an aerobic biomembrane pond and an MBR pond: 4: 1.
preferably, the duration of the period of time that the aerobic biological membrane tank fan, the MBR tank fan and the anoxic biological membrane tank stirrer in the step (3) operate for a period of time is 1-2 hours.
Preferably, the unit period operation mode of the MBR membrane suction water outlet pump in the step (4) is that the MBR membrane suction water outlet pump is stopped for 1 minute after 3 minutes of operation, and the suction water outlet flow rate is matched with the water inlet flow rate; the on-off time ratio of the intermittent operation of the aerobic biomembrane pool fan is (1-4): 1, the ratio of aeration air volume to water inflow is 15: 1; the on-off time ratio of the intermittent operation of the reflux pump of the aerobic biomembrane pool is (1-2): 1, the reflux ratio is 200-400%.
Compared with the prior art, the starting method for treating the small-sized high-concentration domestic sewage in the remote dispersion area based on the A/O biomembrane-MBR process has the advantages that:
1) the invention organically combines the natural culture method with the sludge inoculation method, fully utilizes the advantages of stronger sewage pertinence of the sludge cultured by the natural culture method and short starting time of the sludge inoculation method, and solves the problems of long acclimation time of the sludge in the sewage treatment equipment reaction in remote dispersed areas, difficult starting and the like;
2) the invention 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 standing and guard of personnel, and suitability for debugging and starting of large-scale water treatment equipment in remote dispersion areas;
3) the invention balances the growth rate and the aerobic digestion rate of the sludge in the MBR tank, so that the amount of the excess sludge 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 in the A/O biomembrane-MBR process tank are effectively solved, and the stable operation of small and miniature high-concentration domestic sewage treatment equipment in remote decentralized areas is facilitated.
Drawings
FIG. 1 is a flow chart of the start-up mode of the present invention.
FIG. 2 is a schematic view of an A/O biofilm-MBR sewage treatment unit.
In the figure, 1-an adjusting tank, 2-A/O biomembrane-MBR process tank, 3-water inlet pump, 4-anoxic biomembrane tank stirrer, 5-anoxic biomembrane tank, 6-aerobic biomembrane tank, 7-biological filler, 8-aerobic biomembrane tank reflux pump, 9-MBR tank, 10-MBR membrane component, 11-MBR membrane suction water pump, 12-first flowmeter, 13-second flowmeter, 14-aerobic biomembrane tank fan and 15-MBR tank fan.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the method for starting domestic sewage provided by the present invention is described in detail below with reference to the following examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
The invention is applied to treat the sewage in a high-speed service area, and the water quality condition of the sewage is as follows: the COD value is 403 +/-100 mg/L, and the ammonia nitrogen concentration is 150 +/-20 mg/L. The treatment process adopts an A/O biomembrane-MBR process, and the effective volumes of the aerobic biomembrane tank and the MBR tank are 75m3。
1) A sewage water injection stage: and (3) filling the aerobic biomembrane pond, the anoxic biomembrane pond and the MBR pond with domestic sewage raw water in the service area regulating pond, starting an aeration device, and aerating the aerobic biomembrane pond and the MBR pond for 24 hours.
2) A sludge inoculation stage: after the step (1) is finished, according to the calculation of adding 4kg of dehydrated sludge into each unit of effective volume of the tank body, pulling and transporting 300kg of fresh dehydrated sludge which is not added with the drugs and is subjected to filter pressing by a sludge filter press of the municipal sewage treatment plant as seed sludge of reaction equipment. The dewatered sludge is treated according to the following steps of 1: 4: the adding proportion of 1 is that 50kg, 200kg and 50kg of dewatered sludge are respectively added into the anoxic biomembrane pond, the aerobic biomembrane pond and the MBR pond.
3) And (3) mixing: and (3) after the step (2) is finished, opening the aerobic biomembrane pond fan, the MBR pond fan and the anoxic biomembrane pond stirrer, and working for 2 hours.
4) A continuous operation stage: 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 amount actually generated in the service area every day; the membrane pumping water outlet pump is stopped for 1 minute according to 3 minutes of operation and continuously operated in an operation period, and the water outlet flow and the water inlet flow of the membrane are regulated and controlled to be the same as the water inlet flow; starting an anoxic tank stirrer and an MBR tank fan and continuously operating; starting the aerobic biomembrane pool fan, and adjusting the air quantity and water inflow ratio of the aerobic biomembrane pool fan to be 15: 1, the operation is intermittently carried out according to the mode of operating for 60 minutes and stopping operating for 30 minutes. Starting a reflux pump of the aerobic biomembrane pond, intermittently and continuously operating in a 60-minute operation mode after operating for 60 minutes, and adjusting the reflux ratio to 200%. After 12 days of operation, the ammonia nitrogen in the effluent of the system is reduced to 4.2 +/-1.2 mg/L from 150 +/-20 mg/L, and the COD is reduced to below 45 +/-5 mg/L from 403 +/-100 mg/L, which marks the successful start of the A/O biomembrane-MBR process.
The present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit and scope of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. A starting method for treating domestic sewage based on an A/O biomembrane-MBR process is suitable for small and miniature high-concentration domestic sewage in a dispersion area, and is characterized by comprising the following steps:
(1) a sewage water injection stage: filling the anoxic biomembrane pond, the aerobic biomembrane pond and the MBR pond with raw sewage to be treated, and aerating for a period of time;
(2) a sludge inoculation stage: after the step (1) is finished, conveying fresh dewatered sludge with a certain weight from an urban domestic sewage treatment plant as inoculation sludge, and respectively adding the conveyed dewatered sludge into an anoxic biomembrane pond, an aerobic biomembrane pond and an MBR pond according to a certain proportion;
(3) and (3) mixing: after the step (2) is finished, immediately starting an aerobic biomembrane pond fan, an MBR pond fan and an anoxic biomembrane pond stirrer and running for a period of time to fully and uniformly fill the sludge in the reaction pond as far as possible;
(4) a continuous operation stage: after the step (3) is finished, continuously feeding water into the reaction tank, continuously and periodically operating an MBR membrane suction water outlet pump, and starting an anoxic biomembrane tank stirrer, an aerobic biomembrane tank fan, an MBR tank fan and an aerobic biomembrane tank reflux pump, wherein the aerobic biomembrane tank fan and the aerobic biomembrane tank reflux pump operate in an intermittent manner; the anoxic biomembrane pond stirrer and the MBR pond fan operate in a continuous mode.
2. The start-up method for treating domestic sewage based on the A/O biofilm-MBR process according to claim 1, wherein the aeration in the step (1) is performed for a period of time preferably 8-24 hours.
3. The start-up method for treating domestic sewage based on the A/O biofilm-MBR process according to claim 2, wherein the dehydrated sludge in the step (2) is obtained from non-medicated dehydrated sludge which is filter-pressed by a sludge filter press of a municipal domestic sewage treatment plant; the certain weight is the weight of the sludge calculated by multiplying the effective volumes of the aerobic biomembrane tank and the MBR tank by the unit addition amount; the unit adding amount is preferably that 2-5kg of dewatered sludge is added per unit effective volume; the fresh dehydrated sludge is dehydrated sludge generated by a filter press within 30 minutes; the sludge adding proportion is preferably 1 in an anoxic biomembrane pond, an aerobic biomembrane pond and an MBR pond: 4: 1.
4. the starting method for treating domestic sewage based on the A/O biofilm-MBR process according to claim 3, wherein the period of time for which the aerobic biofilm tank fan, the MBR tank fan and the anoxic biofilm tank stirrer are operated in step (3) is 1-2 hours.
5. The starting method for treating the domestic sewage based on the A/O biomembrane-MBR process according to claim 4, wherein the unit period operation mode of the MBR membrane suction water outlet pump in the step (4) is 3 minutes of operation and 1 minute of stop, and the suction water outlet flow rate is matched with the water inlet flow rate; the on-off time ratio of the intermittent operation of the aerobic biomembrane pool fan is (1-4): 1, the ratio of aeration air volume to water inflow is 15: 1; the on-off time ratio of the intermittent operation of the reflux pump of the aerobic biomembrane pool is (1-2): 1, the reflux ratio is 200-400%.
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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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