title: Nitrification recovery behavior by bio-accelerators in copper-inhibited activated sludge system.
abstract: Copper (Cu) is a toxic heavy metal which can cause inhibitory effects on nitrification process in biological wastewater treatment systems. However, few studies have done to dose accelerators into Cu-inhibited activated sludge system to promote bioactivity recovery of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB). In this study, four ingredients of bio-accelerators were developed and dosed in five parallel SBRs. The effluent NH4(+)-N, NO2(-)-N and NO3(-)-N concentrations, specific oxygen uptake rate (SOUR), and Cu distribution were investigated to assess the bioactivity recovery effects. Results showed that, among biotin, L-aspartic acid and cytokinin, L-aspartic acid was the most effective for the fast bioactivity recovery of nitrifying bacteria. The combination of these three substances was optimum and Cu-inhibited activated sludge system could be 100% recovered in 8 days. The bio-accelerators proposed in this study can be potentially applied in the emergency treatment in biological wastewater treatment systems.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Tianjin Engineering Center of Urban River Eco-Purification Technology, Tianjin 300072, China. Electronic address: yingxinzhao@tju.edu.cn.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Tianjin Engineering Center of Urban River Eco-Purification Technology, Tianjin 300072, China.
authors.forename: Min
authors.initials: M
authors.lastname: Ji
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Tianjin Engineering Center of Urban River Eco-Purification Technology, Tianjin 300072, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Zhai
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D001224:Aspartic Acid / Q000494:pharmacology*; D019149:Bioreactors / Q000382:microbiology; D001710:Biotin / Q000494:pharmacology*; D003300:Copper / Q000378:metabolism / Q000494:pharmacology*; D003583:Cytokinins / Q000494:pharmacology*; D058465:Nitrification / Q000187:drug effects / Q000502:physiology; D012722:Sewage / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism; D018508:Water Purification / Q000379:methods
chemical_list: D064751:Ammonium Compounds; D003583:Cytokinins; D012722:Sewage; D014874:Water Pollutants, Chemical; D001224:Aspartic Acid; D001710:Biotin; D003300:Copper
keywords: Activated sludge; Bio-accelerator; Copper inhibition; Nitrification; Recovery