Denitrifying phosphorus removal in a step-feed CAST with alternating anoxic-oxic operational strategy

查看全文 作　　者：MA [1]Juan;PENG [1]Yongzhen;WANG [1]Shuying;WANG [1]Li;LIU [2]Yangt;MA [2]Ningpin

机构地区：[1]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.;[2]China Water Holdings Private Limited, 28 Kaki Bukit Crescent, Kaki Bukit Techpark I S416259, 416259, Singpore.

出　　处：《Journal of Environmental Sciences》索引2009年第21卷第9期,共6页

基　　金：supported by the Environment and Water Industry Development Scheme of Singapore-The Process Control and Enhanced Biological Nutrient Removal of CSBR Process (No. EDB S07/1-53974082);the National Key Technologies R&D Program of China during the Eleventh Five-year Plan Period (No. 2006BAC19B03);the Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission (No. PXM2008-014204-050843);the Funding Project by Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (No. PHR20090502) 摘　　要：A bench-scale cyclic activated sludge technology(CAST) was operated to study the biological phosphorus removal performance and a series of batch tests was carried out to demonstrate the accumulation of denitrifying polyphosphate-accumulating organisms(DNPAOs) in CAST system.Under all operating conditions,step-feed CAST with enough carbon sources in influent had the highest nitrogen and phosphorus removal effciency as well as good sludge settling performance.The average removal rate of COD,NH4+-N,PO43--P and total nitrogen(TN) was 88.2%,98.7%,97.5% and 92.1%,respectively.The average sludge volume index(SVI) was 133 mL/g.The optimum anaerobic/aerobic/anoxic(AOA) conditions for the cultivation of DNPAOs could be achieved by alternating anoxic/oxic operational strategy,thus a significant denitrifying phosphorus removal occurred in step-feed CAST.The denitrification of NOx--N completed quickly due to step-feed operation and enough carbon sources,which could enhance phosphorus release and further phosphorus uptake capability of the system.Batch tests also proved that polyphosphate-accumulating organisms(PAOs) in the step-feed process had strong denitrifying phosphorus removal capacity.Both nitrate and nitrite could be used as electron acceptors in denitrifying phosphorus removal.Low COD supply with step-feed operation strategy would favor DNPAOs accumulation. 关键词：污泥沉降性能反硝化除磷脱氮除磷聚磷酸盐饲料加工厌氧/好氧活性污泥工艺污泥容积指数

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Denitrifying phosphorus removal in a step-feed CAST with alternating anoxic-oxic operational strategy

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