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Characterization of sludge reduction and bacterial community dynamics in a pilot-scale multi-stage digester system with prolonged sludge retention time

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Abstract

Sludge reduction performance and bacterial community dynamics in a pilot-scale multi-stage digester system with prolonged sludge retention time were characterized. Throughout the operation period of 281 days, the total loading sludge and the total digested sludge were 4700 and 3300 kg-MLSS. After 114 days of operation, the residual MLSS (RMLSS) in the reactors for sludge treatment was maintained at 18–25 kg-RMLSS m−3, and the sludge reduction efficiency achieved 95% under the F/M ratio (kg-loading MLSS kg-RMLSS−1) of less than 0.018. Also, among the sludge components, both fixed suspended solids and volatile suspended solids were reduced. Based on the sludge reduction performance and the RNA-based bacterial community characteristics, the combined action of the maintenance metabolism, lysis–cryptic growth, and particulate inorganic matter is proposed as the sludge reduction mechanism in the multi-stage sludge treatment process.

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Acknowledgements

This research was supported by the Global Eco Technology Company (Incheon, Republic of Korea).

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Authors and Affiliations

  1. Department of Environmental Science and Engineering, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Republic of Korea

    Jeonghee Yun & Kyung-Suk Cho

  2. Department of Forest Products and Biotechnology, Kookmin University, Seoul, 02707, Republic of Korea

    Jeonghee Yun

  3. Department of Chemical Engineering, Soongsil University, Seoul, 06978, Republic of Korea

    Hee-Wook Ryu

  4. Global Eco Technology Co., LTD, Inchon, 23054, Republic of Korea

    Hyung Pan Kim

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  1. Jeonghee Yun
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Yun, J., Ryu, HW., Kim, H.P. et al. Characterization of sludge reduction and bacterial community dynamics in a pilot-scale multi-stage digester system with prolonged sludge retention time. Bioprocess Biosyst Eng 43, 1171–1183 (2020). https://doi.org/10.1007/s00449-020-02312-w

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  • DOI: https://doi.org/10.1007/s00449-020-02312-w

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