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Effects of High Sludge Cycle Frequency on Performance and Syntrophic Metabolism of Anaerobic Membrane Bioreactor for Treating High-Lipid Kitchen Waste Slurry

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  • Xiaolan Xiao

    (School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
    Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China)

  • Wansheng Shi

    (School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
    Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China)

  • Wenquan Ruan

    (School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
    Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China)

Abstract

The performance and syntrophic metabolism of the Anaerobic Membrane Bio-reactor (AnMBR) treating high-lipid kitchen waste slurry under different sludge cycle frequencies were investigated in this study. When the sludge cycle frequencies were 3.6 cycles/h, 9.0 cycles/h and 14.4 cycles/h, the obtained Organic Loading Rates (OLRs) were 10.3 kg-COD/m 3 d, 12.4 kg-COD/m 3 d and 18.1 kg-COD/m 3 d, while the corresponding biogas productions were 190 L/d, 310 L/d and 520 L/d. Moreover, with an increase of sludge cycle frequency, the Chemical Oxygen Demand (COD) removal efficiency improved from 86.2% to 90.4% and 96.3%. Additionally, the higher sludge cycle frequency did not break up the sludge flocs and further affect the syntrophic degradation of the toxic Long-Chain Fatty Acids (LCFAs). Conversely, the higher sludge cycle frequency enhanced LCFA degradation and decreased LCFA accumulation. Meanwhile, under higher sludge cycle frequencies, the abundance of syntrophic Methanobacterium , Syntrophomonas and Clostridium increased and favored the syntrophic metabolism of LCFAs.

Suggested Citation

  • Xiaolan Xiao & Wansheng Shi & Wenquan Ruan, 2019. "Effects of High Sludge Cycle Frequency on Performance and Syntrophic Metabolism of Anaerobic Membrane Bioreactor for Treating High-Lipid Kitchen Waste Slurry," Energies, MDPI, vol. 12(14), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2673-:d:247716
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    References listed on IDEAS

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    1. Cirne, D.G. & Paloumet, X. & Björnsson, L. & Alves, M.M. & Mattiasson, B., 2007. "Anaerobic digestion of lipid-rich waste—Effects of lipid concentration," Renewable Energy, Elsevier, vol. 32(6), pages 965-975.
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