کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4996788 | 1368274 | 2017 | 8 صفحه PDF | دانلود رایگان |
- SiO2 NPs inhibited nitrifying rate and nitrite reduction rate of activated sludge.
- SPUR and SPRR decreased with the increase of SiO2 NPs from 0 to 30Â mg/L.
- Nitrogen and phosphorus removal rates were related to microbial enzymatic activity.
- SiO2 NPs promoted the ROS production and LDH release of activated sludge.
- SiO2 NPs affected the microbial richness and diversity of activated sludge.
The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated at different silica nanoparticles (SiO2 NPs) concentrations. SiO2 NPs concentration at 5-30Â mg/L had a slight inhibitory impact on the nitrogen and COD removals, whereas the phosphorus removal was obviously inhibited at 30Â mg/L SiO2 NPs. The rates of nitrification, nitrite reduction and phosphorus removal decreased with the increase of SiO2 NPs concentration. The nitrate reduction rate decreased at less than 5Â mg/L SiO2 NPs and subsequently showed an increase at 10-30Â mg/L SiO2 NPs. The organic matter, nitrogen and phosphorus removal rates had similar varying tendencies to the corresponding microbial enzymatic activities under SiO2 NPs stress. Some SiO2 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 SiO2 NPs stress.
Journal: Bioresource Technology - Volume 245, Part A, December 2017, Pages 673-680