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

Xiaolan Xiao, Wansheng Shi and Wenquan Ruan
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Xiaolan Xiao: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
Wansheng Shi: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
Wenquan Ruan: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China

Energies, 2019, vol. 12, issue 14, 1-13

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.

Keywords: tubular membrane; digestion performance; sludge characteristics; long-chain fatty acids; syntrophic relationship (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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