期刊
BIORESOURCE TECHNOLOGY
卷 250, 期 -, 页码 265-272出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.053
关键词
Anammox; Maghemite nanoparticles; Sludge; High-throughput sequencing; Nitrogen removal
资金
- Science and Technology Development Program of Hangzhou [20170533B09]
- Natural Science Foundation of China [51578204]
Magnetic nanoparticles (NPs) have been widely applied in environmental remediation, biomass immobilization and wastewater treatment, but their potential impact on anaerobic ammonium oxidation (anammox) biomass remains unknown. In this study, the short-term and long-term impacts of maghemite NPs (MHNPs) on the flocculent sludge wasted from a high-rate anammox reactor were investigated. Batch assays showed that the presence of MHNPs up to 200 mg L-1 did not affect anammox activity, reactive oxygen species production, or cell membrane integrity. Moreover, long-term addition of 1-200 mg L-1 MHNPs had no adverse effects on reactor performance. Notably, the specific anammox activity, the abundance of hydrazine synthase structural genes and the content of extracellular polymeric substance were increased with elevated MHNP concentrations. Meanwhile, the community structure was shifted to higher abundance of Candidatus Kuenenia indicated by high-throughput sequencing. Therefore, MHNPs could be applied to enhance anammox flocculent sludge due to their favorable biocompatibility.
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