title: Analysis of the impact of reflux ratio on coupled partial nitrification-anammox for co-treatment of mature landfill leachate and domestic wastewater.
abstract: A combined system of anaerobic-aerobic techniques was used for deep co-treatment of mature landfill leachate and domestic sewage, mixed at a ratio of 1:5, through partial nitrification-anammox. While ensuring synchronous removal of organic matter and nitrogen, we investigated changes in several factors under different reflux ratios (0%, 100% and 300%). High nitrification efficiency and a relatively high accumulation rate of NO2(-)-N were achieved, the latter through selective inhibition of bacteria by free ammonia. The results indicated that maintaining the reflux ratio within an optimum range contributes to the enrichment of anammox bacteria. In this study, the optimum ratio, which permitted the highest removal rates of chemical oxygen demand (COD), NH4(+)-N, and total nitrogen, was 300%. The COD level in the anammox reactor (ANAOR) decreased to lower than 70 mg/L, resulting in no inhibitory effect on anammox and maximum enrichment of bacteria.
authors.affiliation: Beijing Institute of Petrochemical Technology, Beijing 102617, China; State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Lina
authors.initials: L
authors.lastname: Wu
authors.affiliation: Laboratory of Water Systems Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Lieyu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Beijing Institute of Petrochemical Technology, Beijing 102617, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Shi
authors.affiliation: Beijing Institute of Petrochemical Technology, Beijing 102617, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: pyz@bipt.edu.cn.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000641:Ammonia / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis; D012722:Sewage / Q000032:analysis; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000641:Ammonia; D009584:Nitrogen; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Anammox; Anoxic/aerobic; Domestic wastewater; Mature landfill leachate; Partial nitrification