Process stability and microbial response of anaerobic membrane bioreactor treating high-strength kitchen waste slurry under different organic loading rates

2017 ◽  
Vol 121 ◽  
pp. 35-43 ◽  
Author(s):  
Xiaolan Xiao ◽  
Wansheng Shi ◽  
Zhenxing Huang ◽  
Wenquan Ruan ◽  
Hengfeng Miao ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
High Strength ◽  
Organic Loading ◽  
Process Stability ◽  
Kitchen Waste ◽  
Loading Rates ◽  
Anaerobic Membrane Bioreactor ◽  
Microbial Response

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

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2673 ◽  
Author(s):  
Xiaolan Xiao ◽  
Wansheng Shi ◽  
Wenquan Ruan
Keyword(s):  
Membrane Bioreactor ◽  
Oxygen Demand ◽  
Long Chain Fatty Acids ◽  
Organic Loading ◽  
Kitchen Waste ◽  
Cycle Frequency ◽  
Sludge Flocs ◽  
Loading Rates ◽  
High Lipid ◽  
Syntrophic Degradation

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/m3d, 12.4 kg-COD/m3d and 18.1 kg-COD/m3d, 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.

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