title: Effect of nitrate recycling ratio on simultaneous biological nutrient removal in a novel anaerobic/anoxic/oxic (A2/O)-biological aerated filter (BAF) system.
abstract: A novel system integrating anaerobic/anoxic/oxic (A(2)/O) and biological aerated filter (BAF), which could solve the sludge retention time (SRT) conflicting problem between nitrifiers and polyphosphate accumulating organisms (PAOs) by shortening SRT for PAOs in A(2)/O and lengthening SRT for nitrifiers in BAF, was investigated in this study. Various nitrate recycling ratios (100%, 200%, 300% and 400%) were applied to a lab-scaled A(2)/O-BAF system to detect the simultaneous biological nitrogen and phosphorus removal performance while treating real domestic wastewater with low carbon to nitrogen (C/N) ratio. The concentrations of chemical oxygen demand (COD), NH(4)(+)-N and total phosphorus (TP) in the effluent were less than 50.0, 0.5 and 0.5mg/L, respectively, throughout the experiments. The removal efficiencies of total nitrogen (TN) were 64.9%, 77.0%, 82.0% and 87.0%, under respective nitrate recycling ratios (increasing from 100% to 400%). By contrast, nitrate recycling ratios had neglectable effect on the removal efficiencies of COD and NH(4)(+)-N.
authors: Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
authors: Yongzhi
authors: Y
authors: Chen
authors: Chengyao
authors: C
authors: Peng
authors: Jianhua
authors: J
authors: Wang
authors: Liu
authors: L
authors: Ye
authors: Liangchang
authors: L
authors: Zhang
authors: Yongzhen
authors: Y
authors: Peng
mesh_terms: D005374:Filtration / Q000295:instrumentation*; D009566:Nitrates / Q000378:metabolism*; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D012722:Sewage; D014873:Water Pollutants / Q000302:isolation & purification*
chemical_list: D009566:Nitrates; D012722:Sewage; D014873:Water Pollutants; D010758:Phosphorus; D009584:Nitrogen