期刊
BIORESOURCE TECHNOLOGY
卷 360, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127567
关键词
Phenanthrene; Methane; Microbial community; Extracellular polymeric substances; Functional genes
资金
- National Key R&D Program of China [2019YFC1906304]
- National Natural Science Foundation of China [21777121]
- Key R&D Plan of Anhui Province [202104g01020010]
This study investigated the effects of polycyclic aromatic hydrocarbons (PAHs) on the anaerobic co-digestion of waste activated sludge and food waste. The study found that four different PAHs, especially phenanthrene, had positive contributions to methane production. Mechanism exploration revealed improvements in acidogenesis, acetogenesis, and methanogenesis in the presence of phenanthrene, with the most significant improvement seen in acetotrophic methanogenesis.
Polycyclic aromatic hydrocarbons (PAHs) have been reported to influence acetic acid production during anaerobic treatment. However, investigations of the impacts of PAHs on the anaerobic co-digestion of waste activated sludge and food waste are limited. Therefore, the effects of PAHs on anaerobic co-digestion were explored in this study. Four kinds of PAHs all exhibited positive contributions to methane production, especially phenanthrene. Mechanism exploration revealed that acidogenesis, acetogenesis, and methanogenesis were improved in the presence of phenanthrene, and acetotrophic methanogenesis had the greatest improvement with 69.4%. Dominant bacteria and archaea related to acetic acid and methane accumulation were changed by phenanthrene. Moreover, extracellular polymeric substances, coenzyme F420, and McrA gene copy number were promoted by phenanthrene, which was beneficial for the generation of acetic acid and methane. Overall, this study provides new insights into the role of organic pollutants in the anaerobic co-digestion of solid wastes.
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