Study On SBR Simultaneous Nitrogen And Phosphorus Removal Effect And Influence Factors

In recent years,China’s social development is very rapid,and towns are getting bigger,so as the emissions of urban sewage;there are some disadvantages of existing urban sewage plant,such as backward technology,device configuration and process control deficiencies,etc.Therefore,the nitrogen and phosphorus in the effluent water is excessive and the energy consumption is always high,etc.SBR process is a sequencing batch activated sludge process,which has been the preferred process of the small town sewage and industrial wastewater treatment.How to adjust the operating parameters,change the operating mode to improve water quality and reduce operating costs on the basis of the original process has long-term significance for improving the water environment and sustainable development.Denitrifying phosphorus removal bacteria(DPB)has both denitrification and phosphorus removal effect,and denitrification and phosphorus removal resolved the COD competition issues between PAOs and denitrifying bacteria,which can effectively remove phosphorus in wastewater,while reducing the amount of aeration,reduce sludge production.In order to achieve denitrification and phosphorus removal in SBR process,the tests include anaerobic/aerobic/anoxic/aerobic SBR sync nitrogen and phosphorus removal system startup,after the start,research the factors affecting the SBR system,and research the treatment effect of SBR system for campus life area sewage.The test shows that under the condition of water temperature is 21～25 ℃,pH value 6.9～7.1,COD concentration is 200～300mg/L,NH4+-N concentration is 40～50mg/L,concentration of TP is 5～6mg/L,after anaerobic/aerobic running and alternating anaerobic/aerobic/anoxic/aerobic two-phase alternating running domestication,successful completed the startup of SBR reactor.The effluent COD,NH4+-N,TP concentrations were 19.97mg/L,0.60mg/L,0.20mg/L,achieving A standard in "urban sewage treatment plant pollutant discharge standard"(GB18918-2002).The best hydraulic cycle dwell time is obtained:inlet 10min,anaerobic 120min,aerobic 120min,anaerobic 30min,anaerobic 30min,precipitation 60min,drainage 10min,standby 100min.Study on temperature,aeration rate,effect of the influent pH value and COD concentration of influent nitrogen and phosphorus removal in SBR system is conduct.When the temperature under 18℃,system processing efficiency decreases with the temperature decreasing.System can run stably and has strong ability of nitrogen and phosphorus removal rate when 23 and 28 degrees;aeration rate 0.15m3/h,treatment effect is the best,NH4+-N,TP removal rate reach 99%,92%;the influent pH value 7.0～7.5,the removal rate of TP is best,up to 90～92%;when the concentration of COD is 200～300mg/L,organic carbon source can be fully used by phosphorus accumulating bacteria,while inlet COD concentration is 500mg/L,COD and TP removal rate decreased.The optimal temperature is 23℃,aeration is 0.15m3/h,influent pH value 7.0～7.5,COD concentration of influent 200～300mg/L,under stable running of the system,the effluent COD,NH4+-N,TP concentrations were 6.43mg/L,0.41 mg/L,0.15mg/L,achieving A standard in"urban sewage treatment plant pollutant discharge standard"(GB 18918-2002).Campus living area sewage directly effluents into the SBR reactor after standing pretreatment processing,COD,TN,TP removal rates were 66%,54%,17%,the COD,TN,TP removal rate reached 88%,82%,91%by adjusting the amount of aeration and adding sodium acetate raw water,the treatment effect SBR system was significantly improved,and the sewage colors and SS can be effectively reduce.Anaerobic/aerobic/anoxic/aerobic SBR simultaneous nitrogen and phosphorus removal system,can realize the denitrifying phosphorus removal,save the agitation and aeration time,reduce energy consumption 17%,can achieve better treatment effect in treatment of campus sewage,providing the basis for the upgrade and application of SBR technology.