The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated at different silica nanoparticles (SiO NPs) concentrations. SiO NPs concentration at 5-30mg/L had a slight inhibitory impact on the nitrogen and COD removals, whereas the phosphorus removal was obviously inhibited at 30mg/L SiO NPs. The rates of nitrification, nitrite reduction and phosphorus removal decreased with the increase of SiO NPs concentration. The nitrate reduction rate decreased at less than 5mg/L SiO NPs and subsequently showed an increase at 10-30mg/L SiO NPs. The organic matter, nitrogen and phosphorus removal rates had similar varying tendencies to the corresponding microbial enzymatic activities under SiO NPs stress. Some SiO NPs were firstly absorbed on sludge surface and subsequently entered the interior of the microbial cells, which could exert the biological toxicity to activated sludge. The microbial community showed some obvious variations under SiO NPs stress.
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| http://dx.doi.org/10.1016/j.biortech.2017.09.018 | DOI Listing |
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