Abstract |
To understand the denitrification efficiency and microbial community shift with increasing salinity in salinity adaptation and shock loading process, nitrate (NO3--N), nitrite (NO2--N) and chemical oxygen demand (COD) removal efficiencies were monitored feeding acetate and primary sludge fermentation liquid. During adaptation process, salinity had little effect on NO3--N removal efficiency (>99.0%) with acetate-fed, while for fermentation liquid-fed, it decreased to around 97% at high salinity (>2.5%). Effluent NO2--N was lower than 0.1 mg/L, though obvious fluctuation of NO2--N was observed with fermentation liquid-fed when salinity change. During shock loading process, denitrification process all had slight decrease when the salinity abruptly increased to 5.0%. Traditional denitrifier of Thauera was the dominant genus, and a specialized microbial community of Azoarcus in salinity adaptation and Paracoccus in shock loading for denitrification showed high salinity tolerant. Meanwhile, microbial diversity was enriched with fermentation liquid-fed at high salinity condition.
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Authors | Zengshuai Zhang, Yiding Guo, Liang Guo, Fawen Hu, Yangguo Zhao, Chunji Jin, Zonglian She, Mengchun Gao, Guangce Wang |
Journal | Bioresource technology
(Bioresour Technol)
Vol. 305
Pg. 123030
(06 2020)
ISSN: 1873-2976 [Electronic] England |
PMID | 32114301
(Publication Type: Journal Article)
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Copyright | Copyright © 2020 Elsevier Ltd. All rights reserved. |