Nitrification recovery behavior by bio-accelerators in copper-inhibited activated sludge system.
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.
['Wang|Yue|Y|', 'Zhao|Yingxin|Y|', 'Ji|Min|M|', 'Zhai|Hongyan|H|']
D064751:Ammonium Compounds D001224:Aspartic Acid D019149:Bioreactors D001710:Biotin D003300:Copper D003583:Cytokinins D058465:Nitrification D012722:Sewage D014874:Water Pollutants, Chemical D018508:Water Purification
Nitrification Recovery Bio-accelerator Activated sludge Copper inhibition