Journal
BIORESOURCE TECHNOLOGY
Volume 313, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123652
Keywords
Metanil Yellow; Azo dye; Decolorization; Microbial community; Soluble microbial products; Salinity
Funding
- National Natural Science Foundation of China [31600091, 51608257, 31770152, 31400094, 31800098]
- special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control [18K01ESPCT]
- Innovative Foundation of Nanjing Institute of Technology [CKJA201907]
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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.
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