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Semi-continuous feeding combined with traditional domestication improved anaerobic performance during treatment of
Fuzhi Lu1, Qiong Jiang2, Feng Qian3
1College of Life Science and Technology, Guangxi University, Nanning 530005, Guangxi, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Nanning 530005, Guangxi, China; College of Chemical and Biological Engineering, Hechi University, Hechi 546300, Guangxi, China.
Abstract:
The effects of feeding pattern were studied during anaerobic digestion of cassava stillage. Continuous feeding and semi-continuous feeding, were adopted in two internal circulation (IC) reactors (A and B, respectively). The reactors showed different performance in the anaerobic digestion process. The maximum difference, was observed for the soluble chemical oxygen demand (SCOD) removal rate and the biogas production, which were 23.2% and 95.7 L/2 d higher in reactor B than reactor A, respectively. The overall VFAs level of reactor A was higher than that of reactor B. Microbial community analyses indicated that the abundances of dominant bacteria and methanogens became higher in the reactor B than in reactor A as the digestion process progressed. Hence, semi-continuous feeding showed superior performance than continuous feeding for SCOD removal rate, biogas production, and the relative abundances of methanogens in the case of high OLR.
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