作者
Zhiyao Wang, Gaofeng Ni, Nova Maulani, Jun Xia, Haydée De Clippeleir, Shihu Hu, Zhiguo Yuan, Min Zheng
发表日期
2021/5/15
期刊
Water Research
卷号
196
页码范围
117026
出版商
Pergamon
简介
Recently, acidic (i.e. pH<5) nitrification in activated-sludge is attracting attention because it enables stable nitritation (NH4+ → NO2−), and enhances sludge reduction and stabilization. However, the key acid-tolerant ammonia oxidizers involved are poorly understood. In this study, we performed stoichiometric and kinetic characterization of a new acid-tolerant ammonia-oxidizing bacterium (AOB) belonging to gamma-proteobacterium, Candidatus Nitrosoglobus. Ca. Nitrosoglobus was cultivated in activated-sludge in a laboratory membrane bioreactor over 200 days, with a relative abundance of 55.1 ± 0.5% (indicated by 16S rRNA gene amplicon sequencing) at the time of the characterization experiments. Among all known nitrifiers, Ca. Nitrosoglobus bears the highest resistance to nitrite, low pH, and free nitrous acid (FNA). These traits define Ca. Nitrosoglobus as an adversity-strategist that tends to prosper in acidic …
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Z Wang, G Ni, N Maulani, J Xia, H De Clippeleir, S Hu… - Water Research, 2021