Unraveling the impact of nanoscale zero-valent iron on the nitrogen removal performance and microbial community of anammox sludge
Bioreactors
Sewage
Nitrogen
Iron
Denitrification
Anaerobiosis
Oxidation-Reduction
01 natural sciences
6. Clean water
0105 earth and related environmental sciences
DOI:
10.1016/j.biortech.2017.07.049
Publication Date:
2017-07-11T05:06:13Z
AUTHORS (7)
ABSTRACT
Given the increasing use of nanoscale zero-valent iron (NZVI) particles for environmental remediation and wastewater treatment, their potential impact on anaerobic ammonium oxidation (anammox) bacteria was investigated in this study using anammox sludge. Batch assays showed that NZVI concentrations up to 200mgL-1 did not affect anammox activity, reactive oxygen species production, and cell membrane integrity. The nitrogen removal efficiency of the continuous-flow reactor fluctuated in the presence of 20 or 50mgL-1 NZVI, but it could return to normal over time, even at 200mgL-1 NZVI. 16S rDNA-based high-throughput sequencing indicated that although the presence of 10, 20, 50, and 200mgL-1 NZVI to some extent affected microbial composition, the anammox bacteria (Candidatus Kuenenia) never lost its dominance. The abundance of gene families that are related to the assimilation and utilization of iron was down-regulated in response to the stress of high-level NZVI.
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