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Elucidating a synergistic effect of food waste addition on the enhanced anaerobic digestion of waste activated sludge

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Abstract

Waste activated sludge (WAS) has often been anaerobically digested with other types of organic waste, expecting a synergistic enhancement. In the present work, a slight amount of food waste (FW) such that the change of the substrate concentration and the C/N ratio could be neglected was added to WAS and biological methane potential tests were performed. As the amount of FW input increased, the total amount of CH4 produced and CH4 yield increased. The calculation proved that at least 30% of the increased amount of CH4 produced was derived from WAS, clearly signalling a synergistic enhancement. Measurements of the hydrolytic extracellular protease activity and ammonia concentration support the finding of synergism in that the addition of easily biodegradable organics to WAS facilitated the degradation of protein, a major constituent of WAS. This is the first report clearly revealing a synergistic effect of FW addition on the enhanced digestion of WAS.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

    Yeo-Myeong Yun & Hang-Sik Shin

  2. Microbial Ecology Laboratory, Microbiology, School of Natural Sciences and Ryan Institute, National University of Ireland, Galway, Ireland

    Si-Kyung Cho

  3. Department of Environmental Engineering, Chonbuk National University, 567, Baekje-daero, deokjin-gu, Jeonju, Jeonbuk, 561-756, Korea

    Hyun-Woo Kim

  4. Center for Water Resource Cycle Research, Korea Institute of Science and Technology, P. O. Box 131, Cheongryang, Seoul, 130-650, Korea

    Kyung-Won Jung

  5. Biomass and Waste Energy Laboratory, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon, 305-343, Korea

    Dong-Hoon Kim

Authors
  1. Yeo-Myeong Yun
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  2. Si-Kyung Cho
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  3. Hyun-Woo Kim
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  4. Kyung-Won Jung
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  5. Hang-Sik Shin
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  6. Dong-Hoon Kim
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Yun, YM., Cho, SK., Kim, HW. et al. Elucidating a synergistic effect of food waste addition on the enhanced anaerobic digestion of waste activated sludge. Korean J. Chem. Eng. 32, 1542–1546 (2015). https://doi.org/10.1007/s11814-014-0271-4

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  • DOI: https://doi.org/10.1007/s11814-014-0271-4

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