title: Improvement of nutrient removal by optimizing the volume ratio of anoxic to aerobic zone in AAO-BAF system.
abstract: A two-sludge system, combining anaerobic/anoxic/aerobic process with biological aerated filter (AAO-BAF), is used to treat domestic wastewater with low COD/N ratio (around 3.6). The volume ratio of anoxic to aerobic zone (Vano/Vaer) of the AAO reactor gradually increased from 2:5 to 6:1, during which the nutrient removal was improved. However, phosphorous removal began to deteriorate noticeably while Vano/Vaer increased to 7:0. The favorable Vano/Vaer was between 2.5:1 and 6:1. When Vano/Vaer was 6:1, the average removal efficiencies of COD, TN and PO4(3-) were 89±4%, 83±3% and 99±1%, respectively. This study suggested the AAO-BAF system could achieve efficient nitrogen and phosphorous removal with limited carbon source.
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: zhangweitang@yahoo.com.
authors.forename: Weitang
authors.initials: W
authors.lastname: Zhang
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.forename: Nanqi
authors.initials: N
authors.lastname: Ren
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Liu
authors.forename: Yongzhi
authors.initials: Y
authors.lastname: Chen
mesh_terms: D019149:Bioreactors; D005374:Filtration / Q000295:instrumentation; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: AAO; BAF; COD/N ratio; Denitrifying phosphorus removal; Domestic wastewater