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Effects of Stepwise Temperature Shifts in Anaerobic Digestion for Treating Municipal Wastewater Sludge: A Genomic Study

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  • Gede Adi Wiguna Sudiartha

    (Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 755-8611, Japan
    Environmental Engineering Study Program, Faculty of Engineering, Udayana University, Bali 80361, Indonesia)

  • Tsuyoshi Imai

    (Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 755-8611, Japan)

  • Yung-Tse Hung

    (Department of Civil and Environmental Engineering, Cleveland State University, FH 112, 2121 Euclid Ave, Cleveland, OH 44115, USA)

Abstract

In wastewater treatment plants (WWTP), anaerobic digester (AD) units are commonly operated under mesophilic and thermophilic conditions. In some cases, during the dry season, maintaining a stable temperature in the digester requires additional power to operate a conditioning system. Without proper conditioning systems, methanogens are vulnerable to temperature shifts. This study investigated the effects of temperature shifts on CH 4 gas production and microbial diversity during anaerobic digestion of anaerobic sewage sludge using a metagenomic approach. The research was conducted in lab-scale AD under stepwise upshifted temperature from 42 to 48 °C. The results showed that significant methanogen population reduction during the temperature shift affected the CH 4 production. With 70 days of incubation each, CH 4 production decreased from 4.55 L·g −1 -chemical oxygen demand (COD) at 42 °C with methanogen/total population (M·TP −1 ) ratio of 0.041 to 1.52 L·g −1 COD (M·TP −1 ratio 0.027) and then to 0.94 L·g −1 COD ( M·TP −1 ratio 0.026) after the temperature was shifted to 45 °C and 48 °C, respectively. Methanosaeta was the most prevalent methanogen during the thermal change. This finding suggests that the Methanosaeta genus was a thermotolerant archaea. Anaerobaculum , Fervidobacterium, and Tepidanaerobacter were bacterial genera and grew well in shifted-up temperatures, implying heat-resistant characteristics.

Suggested Citation

  • Gede Adi Wiguna Sudiartha & Tsuyoshi Imai & Yung-Tse Hung, 2022. "Effects of Stepwise Temperature Shifts in Anaerobic Digestion for Treating Municipal Wastewater Sludge: A Genomic Study," IJERPH, MDPI, vol. 19(9), pages 1-18, May.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:9:p:5728-:d:810925
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    References listed on IDEAS

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    1. Mirmasoumi, Siamak & Ebrahimi, Sirous & Saray, Rahim Khoshbakhti, 2018. "Enhancement of biogas production from sewage sludge in a wastewater treatment plant: Evaluation of pretreatment techniques and co-digestion under mesophilic and thermophilic conditions," Energy, Elsevier, vol. 157(C), pages 707-717.
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