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Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion

Author

Listed:
  • Mekdimu Mezemir Damtie

    (Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul 04763, Korea
    These authors equally contributed to this work.)

  • Jingyeong Shin

    (Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul 04763, Korea
    These authors equally contributed to this work.)

  • Hyun Min Jang

    (Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 54896, Korea)

  • Young Mo Kim

    (Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul 04763, Korea)

Abstract

A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 °C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 °C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 °C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.

Suggested Citation

  • Mekdimu Mezemir Damtie & Jingyeong Shin & Hyun Min Jang & Young Mo Kim, 2020. "Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion," Energies, MDPI, vol. 13(17), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4547-:d:407693
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    References listed on IDEAS

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    1. Zhang, Yi & Kang, Xihui & Wang, Zhongming & Kong, Xiaoying & Li, Lianhua & Sun, Yongming & Zhu, Shunni & Feng, Siran & Luo, Xinjian & Lv, Pengmei, 2018. "Enhancement of the energy yield from microalgae via enzymatic pretreatment and anaerobic co-digestion," Energy, Elsevier, vol. 164(C), pages 400-407.
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    Cited by:

    1. Jinming Liu & Changhao Zeng & Na Wang & Jianfei Shi & Bo Zhang & Changyu Liu & Yong Sun, 2021. "Rapid Biochemical Methane Potential Evaluation of Anaerobic Co-Digestion Feedstocks Based on Near Infrared Spectroscopy and Chemometrics," Energies, MDPI, vol. 14(5), pages 1-17, March.

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