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Gao, Yueshu; Wang, Xupeng; Li, Jialun; Lee, Chew Tin; Ong, Pei Ying; Zhang, Zhenjia; Li, Chunjie
Bioresource technology, 02/2020, Letnik: 297Journal Article
Display omitted •Immobilized microbial granules improved salinity tolerance.•High ammonia removal (92%) was achieved at salinity up to 35.0 g/L.•Nitrite oxidation bacteria was depressed at salinity above 15.0 g/L.•Microbial community structure was shifted as salinity increased.•Nitrosomonas sp. and Nitrospira sp. were the dominant genera. The novel immobilized microbial granules (IMG) shows a significant effect of nitrification for freshwater aquaculture. However, there is lack of evaluation study on the performance of nitrification at high salinity due to the concentration of recycled water or seawater utilization. A laboratory scale moving bed bioreactor (MBBR) with IMG was tested on recycled synthetic aquaculture wastewater for the nitrification at 2.5 mg/L NH3-N daily. The results indicated that IMG showed a high salinity tolerance and effectively converted ammonia to nitrate up to 92% at high salinity of 35.0 g/L NaCl. As salinity increased from near zero to 35.0 g/L, the microbial activity of nitrite oxidation bacteria (NOB) in the IMG decreased by 86.32%. The microbial community analysis indicated that salinity significantly influenced the community structure. It was found that Nitrosomonas sp. and Nitrospira sp. were the dominant genera for ammonia oxidation bacteria (AOB) and NOB respectively at different salinity levels.
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