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Effects of extracellular polymeric substances and microbial community on the anti-scouribility of sewer sediment

Meng, Daizong, Wu, Jun, Chen, Keli, Li, Huaizheng, Jin, Wei, Shu, Shuzhen, Zhang, Jin
The Science of the total environment 2019 v.687 pp. 494-504
Bacteroidetes, Firmicutes, Gram-positive bacteria, cellulose, microbial communities, pollution, polymers, proteins, sediments, sewer systems, shear stress, storms, China
Sewer sediment is the main source of overflow pollution, and the anti-scouribility of sewer sediment directly determines the amount of the discharged contaminants. In this study, sewer sediments of different depths were collected from combined and storm sewers in Shanghai, China. The anti-scouribility, represented by the shear stress of each layer of sewer sediment, was detected in situ. The microbial community and extracellular polymeric substances (EPS), including carbohydrates and proteins present in the sewer sediments were characterized. The results indicated that the distribution of the anti-scouribility of sewer sediment is regulated. There were positive correlations between the content of EPS, proteins, and carbohydrates, and the anti-scouribility of sediments (Pearson Corr. = 0.604, sig. = 0.219; Pearson Corr. = 0.623, sig. = 0.234; Pearson Corr. = 0.727, sig. = 0.359, respectively). Furthermore, the microbial community had a positive influence on anti-scouribility. In particular, the gram-positive bacterial phyla of Bacteroidetes and Firmicutes may be important and influential for the improvement of anti-scouribility of sediment owing to their production of cellulose.