Title of article :
Enhanced nutrient removal in three types of step feeding process from municipal wastewater
Author/Authors :
Peng، نويسنده , , Yongzhen and Ge، نويسنده , , Shijian، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
An anoxic/oxic step feeding process was improved to enhance nutrient removal by reconfiguring the process into (1) anaerobic/anoxic/oxic step feeding process or (2) modified University of Capetown (UCT) step feeding process. Enhanced nitrogen and phosphorus removal and optimized organics utilization were obtained simultaneously in the modified UCT type with both internal and sludge recycle ratios of 75% as well as anaerobic/anoxic/oxic volume ratio of 1:3:6. Specifically, the UCT configuration and optimized operational conditions lead to the enrichment of denitrifying phosphorus removal microorganisms and achieved improved anaerobic P-release and anoxic P-uptake activities, which were beneficial to the denitrifying phosphorus removal activities and removal efficiencies. Due to high mixed liquor suspended solid and uneven distributed dissolved oxygen, 35% of total nitrogen was eliminated through simultaneous nitrification and denitrification process in aerobic zones. Moreover, 62 ± 6% of influent chemical oxygen demands was involved in the denitrification or phosphorus release processes.
Keywords :
UCT , Simultaneous nitrification and denitrification , Step feeding , Denitrifying phosphorus removal , phosphorus uptake
Journal title :
Bioresource Technology
Journal title :
Bioresource Technology