Journal
BIORESOURCE TECHNOLOGY
Volume 323, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124588
Keywords
Waste activated sludge; Anaerobic fermentation; Volatile fatty acids; Bisphenol A; Metagenome
Funding
- National Key Research and Development Program of China [2019YFD1100203]
- National Natural Science Foundation of China [21777121]
- Postgraduate Research &Practice Innovation Program of Jiangsu Province [SJCX20_0939]
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The research found that BPA can promote the accumulation of VFAs in anaerobic fermentation, increasing the production of VFAs and acetic acid. BPA reduces the microorganisms that consume VFAs, increases those that produce VFAs, and enhances the gene expression of enzymes related to certain metabolic pathways.
Bisphenol A (BPA), a typical persistent organic pollutant in waste activated sludge, was chosen to explore its influence on the accumulation of volatile fatty acids (VFAs), which is an important raw material, during anaerobic fermentation. BPA in the range of 0-200 mg/kg dry sludge was beneficial to VFAs production, from 1564 mg chemical oxygen demand (COD)/L in the control to 2095 mg COD/L with 50 mg/kg BPA; the acetic acid yield was 563 and 1010 mg COD/L with 0 and 50 mg/kg BPA, respectively. The abundance of microorganisms that can consume VFAs was reduced and those responsible for producing VFAs was increased by BPA. Homologous genes of related enzymes in the pathways for amino acid metabolism, fatty acid biosynthesis, ABC transporters and quorum sensing were enhanced in the presence of BPA. The abundance of carbohydrate-active enzymes increased with BPA when compared with the control, benefitting VFAs production.
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