The performance and microbial community of activated sludge from a sequencing batch reactor (SBR) were investigated under long-term exposure of magnetic FeO nanoparticles (FeO NPs). The COD removal showed a slight decrease at 5-60mg/L FeO NPs compared to 0mg/L FeO NPs, whereas the NH-N removal had no obvious variation at 0-60mg/L FeO NPs. It was found that 10-60mg/L FeO NPs improved the denitrification process and phosphorus removal of activated sludge. The microbial enzymatic activities of activated sludge could be affected by FeO NPs, which had similar variation trends to the nitrogen and phosphorus removal rates of activated sludge. The reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release demonstrated that FeO NPs led to the toxicity to activated sludge and destroyed the integrity of microbial cytomembrane. High throughput sequencing indicated that FeO NPs could obviously affect the microbial richness and diversity of activated sludge.
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| http://dx.doi.org/10.1016/j.biortech.2016.11.130 | DOI Listing |
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