Exposure to polystyrene nanoplastic leads to inhibition of anaerobic digestion system

In this study, impacts of nanoplastic on the pure and mixed anaerobic digestion systems were investigated. Results showed the growth and metabolism of Acetobacteroides hydrogenigenes were partly inhibited by nanoplastic existed in the pure anaerobic digestion system. The anaerobic digestion of sewag...

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Bibliographic Details
Published in:The Science of the total environment 2018-06, Vol.625, p.64-70
Main Authors: Fu, Shan-Fei, Ding, Jian-Nan, Zhang, Yun, Li, Yi-Fei, Zhu, Rong, Yuan, Xian-Zheng, Zou, Hua
Format: Article
Language:English
Subjects:
Anaerobic digestion
Microbial community structure
Nanoplastic
Sewage sludge
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Summary:In this study, impacts of nanoplastic on the pure and mixed anaerobic digestion systems were investigated. Results showed the growth and metabolism of Acetobacteroides hydrogenigenes were partly inhibited by nanoplastic existed in the pure anaerobic digestion system. The anaerobic digestion of sewage sludge was also obviously inhibited by nanoplastic existed in the mixed anaerobic digestion system. Both the methane yield and methane production rate of the mixed anaerobic digestion system showed negative correlation with the nanoplastic concentration. Compared with anaerobic digestion system without nanoplastic, methane yield and maximum daily methane yield at the nanoplastic concentration of 0.2g/L decreased for 14.4% and 40.7%, respectively. In addition, the start-up of mixed anaerobic digestion system was prolonged by addition of nanoplastic. Microbial community structure analysis indicated the microbial community structures were also affected by nanoplastic existed in the system. At the nanoplastic concentration of 0.2g/L, the relative abundances of family Cloacamonaceae, Porphyromonadaceae, Anaerolinaceae and Gracilibacteraceae decreased partly. Conversely, the relative abundances of family Anaerolinaceae, Clostridiaceae, Geobacteraceae, Dethiosulfovibrionaceae and Desulfobulbaceae improved partly. [Display omitted] •Impacts of nanoplastic on anaerobic digestion system was investigated•Exposure to nanoplastic leads to inhibition of anaerobic digestion system•The inhibitory effect was positive correlation with nonaplastic's concentration•Different microorganism showed unequal response to nanoplastic
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2017.12.158