Journal
BIORESOURCE TECHNOLOGY
Volume 326, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124749
Keywords
Azo dye; Decolorization; Halophilic bacterial consortium; Microbial community; Salinity
Funding
- Innovative Foundation of Nanjing Institute of Technology [CKJA201907, ZKJ201908]
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Bioaugmentation with a halophilic bacterial consortium significantly improved the performance of the HA system for decolorization of azo compounds, leading to better CODMn removal and increased bacterial diversity.
The aim of this work was to study the bioaugmentation of hydrolysis acidification (HA) by a halophilic bacterial consortium. A bacterial consortium was enriched at 5% salinity, and it decolorized metanil yellow G (MYG) at salinities of 1%-15% and dye concentrations of 100-400 mg/L under static conditions. A HA system was constructed to assess the effectiveness of bioaugmentation by the halophilic bacterial consortium. The HA system showed obviously better performance for decolorization and CODMn removal and presented higher the 5-day biological oxygen demand (BOD5)/CODMn (B/C) ratio after bioaugmentation. MiSeq sequencing results indicated that the bacterial communities remarkably shifted and that the bacterial diversity was increased after bioaugmentation. Marinobacterium invaded the native microbe community and became the dominant bacterial genus in the bioaugmented HA, and it played a key role in azo dye decolorization. Therefore, bioaugmentation with a halophilic bacterial consortium improved the HA system for decolorization of azo compounds.
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