Identification of the bacterial community of a pilot-scale thermophilic aerobic bioreactor treating sewage sludge
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- Identification of the bacterial community of a pilot-scale thermophilic aerobic bioreactor treating sewage sludge
- Kim, Young Mo; Cho, Hyun Uk; Park, Ki Young; Park, Hongkeun; Cho, Kyung Hwa
- 16S rRNA gene sequence; Bacterial community; Sewage sludge; Sludge reduction; Thermophilic aerobic digestion
- Issue Date
- ELSEVIER SCI LTD
- INTERNATIONAL BIODETERIORATION & BIODEGRADATION, v.92, no., pp.66 - 70
- The goal of this study was to investigate the bacterial community associated with a pilot-scale thermophilic aerobic digestion (TAD) reactor treating sewage sludge. The digestion system removed up to approximately 30% of volatile solids (VS); VS and total solids (TS) decreased from 38.4 to 26.9g/L and from 51.2 to 43.8g/L, respectively, and the ratio of VS/TS declined from 75.4% to 62.8%. Coincident with the thermal reduction of sludge, 16S rRNA clone library data showed that a significant shift occurred in the bacterial community composition with the selection of the Firmicutes and Deinococcus-Thermus families as well as a marked decrease in the relative abundance of a large part of bacterial taxa such as Proteobacteria. A unique bacterial community in the TAD reactor developed resulting from specific environmental pressures such as thermal stress. A predominance of thermophilic bacteria belonging to Bacillus sp., Geobacillus sp., Thermaerobacter sp. and Thermus thermophilus sp. suggest their putative roles for potentially high thermophilic degradation of sewage sludge.
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