| China's water resources are strained,water use efficiency is not high,water resources waste is very serious,at the same time,poor water resources management has also caused the loss of water resources and pollution.It is one of the important measures to solve the problem of urban water shortage and realize the sustainable development of the society by the effective treatment and reuse of municipal sewage.Due to the traditional Anoxic-aerobic Activated Sludge Process and Membrane Bioreactor are water resource technology efficient and feasible,the organic combination of the research will two,using anaerobic aerobic membrane bioreactor(Anoxic-Aerobic Membrane Bioreactor,hereinafter referred to as A/O-MBR)combination of typical artificial sewage treatment technology configuration,in order to achieve”the city effluent meet the miscellaneous water quality of city sewage regeneration"(GBT18920-2002)requirements.Due to the traditional Anoxic-aerobic Activated Sludge Process and Membrane Bioreactor are efficient and feasible technology to implement the utilization of sewage.this research is a more effective combination of both,using anaerobic-Aerobic Membrane Bioreactor(Anoxic-Aerobic be Bioreactor,hereafter referred to as the A/O MBR)combination process to dispose the typical artificial configuration sewage water in order to make the output water of the test meet the requirements of the urban sewage recycling city miscellaneous water water quality(GBT18920-2002).The aim of this study is exploring the removal efficiency on COD,ammonia nitrogen,total nitrogen,total phosphorus in the sewage and shows feasibility of this test process;To explore and optimize the influence factors on the operation effect and the best running conditions;To clean the ceramic plate menmberane be used in this test effectively.The experiment research shows that:under the condition of no discharge of excess sludge,when the condition of mixed liquor solids of 4000-5200 mg/L,the temperature of 20 to 25?,PH value between 6.5 to 8.5,DO of 2.5-3.5 mg/L in aerobic area,DO to 0-0.5 mg/L in anoxic period,reflux ratio was 200%,removal efficiency of the process in the best situation,The average value of COD,ammonia nitrogen,total nitrogen,total phosphorus in output water is 47.19 mg/L,2.40 mg/L,5.00 mg/L,2.10 mg/L,the average removal rate were 89.86%,91.26%,87.27%,59.56%,ceramic plate membrane in experimental system plays an important role on COD removal,but to the nitrogen and phosphorus removal effect is relatively weak.When the above operation parameters unchanged,putting the powder activated carbon which the particle diameter of them is 100to 150 mesh into the system,COD and ammonia nitrogen removal efficiency improved,the average index of water were dropped to 28.14 mg/L,1.01 mg/L,the average removal rate increased by 4.25 and 4.58%respectively,but for the influence of total nitrogen and total phosphorus is relatively weak.In addition,ceramic plate membrane used in this experiment has the high capability of mechanical strength and corrosion resistance in terms of the prevention and control of membrane fouling and cleaning regeneration,all of them take advantage in the respects of controlling and cleaning of the contaminative membrane,in the process,the main pollutant on the ceramic membrane is the biofilms and other organic substance formed by microorganism and colloidal substance,using alkaline detergent or strong oxidizer combined with physical cleaning methods is the best way to clean the contaminative membrane,through the experiment proved that the put the polluted membrane into 0.1 mol/L sodium hydroxide solution or 1:20 sodium hypochlorite solution 12 h,at the same time,after using a soft brush or sponge to wipe the surface of the diaphragm,membrane fouling was removed effectively,the rate of membrane flux recovered more than 96%.The results shows that the output water quality of the typical sewage disposed by A/O MBR process is favorable,stable and it also can satisfy the urban sewage recycling city miscellaneous water quality(GBT18920-2002),ceramic plate membrane has high mechanical strength,better interception capacity and ability of regeneration and recycling all above makes the system has A good application prospect.This paper provides certain theoretical basis and practical application and has guiding and reference significance. |
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