Effect of salinity on removal performance in hydrolysis acidification reactors treating textile wastewater. (October 2020)

• Record Type: Journal Article
• Authors: Guo, Guang; Tian, Fang; Zhang, Liping; Ding, Keqiang; Yang, Feng; Hu, Zhixin; Liu, Chong; Sun, Yanmei; Wang, Shiwei
• Is Part Of: Bioresource technology. Volume 313(2020)
• Publication Date: 2020-10
• Subjects: Metanil Yellow -- Azo dye -- Decolorization -- Microbial community -- Soluble microbial products -- Salinity; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123652
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Hydrolysis acidification reactor exhibited high decolorization rate at high salinity. High salinity significantly increased EPS, SMP and VFAs. The biodegradability of the synthetic textile wastewater was increased. The effect of salinity on the bacterial consortium during HA was analyzed. Abstract: Hydrolysis acidification (HA) is a classical method for synthetic textile wastewater treatment. However, the salinity effect on the functional mechanism of the microorganisms carrying out HA has rarely been researched. In the present study, the salinity effect on the dye removal efficiency was investigated, and the soluble microbial products (SMP), extracellular polymeric substances (EPS), and microbial community were analyzed at different salinities. The dye and COD removal rates in the HA reactor decreased with increasing salinity. Volatile fatty acids (VFAs) accumulated. The remarkable increases in SMP and EPS were found at high salinity, mainly because more polysaccharides were synthesized than protein. In addition, sequencing analysis showed that high salinity altered the microbial community structure, and Lactococcus, Raoultella and Enterococcus were the decolorizing bacteria at high salinity. This work will improve the understanding of the influence of salinity on the removal efficiency and microbial community during HA.