Semi-continuous feeding combined with traditional domestication improved anaerobic performance during treatment of cassava stillage

Fuzhi Lu; Qiong Jiang; Feng Qian; Quanneng Zhou; Chengjian Jiang; Peihong Shen

doi:10.1016/j.biortech.2019.121807

Semi-continuous feeding combined with traditional domestication improved anaerobic performance during treatment of cassava stillage

Bioresour Technol. 2019 Nov:291:121807. doi: 10.1016/j.biortech.2019.121807. Epub 2019 Jul 13.

Authors

Fuzhi Lu¹, Qiong Jiang², Feng Qian³, Quanneng Zhou⁴, Chengjian Jiang², Peihong Shen⁵

Affiliations

¹ College 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.
² College 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.
³ College 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; Guangxi MeiTaiXin Material Co., Ltd., Hechi 546311, Guangxi, China.
⁴ Guangxi Hengyi Bio-energy Technology Co., Ltd 530007, Guangxi, China.
⁵ College 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. Electronic address: shenpeihong@gxu.edu.cn.

PMID: 31344633
DOI: 10.1016/j.biortech.2019.121807

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.

Keywords: Anaerobic performance; Cassava stillage; Feeding pattern; IC anaerobic reactor; Microbial community structure.

MeSH terms

Anaerobiosis
Bacteria, Anaerobic
Biological Oxygen Demand Analysis
Bioreactors
Domestication
Manihot*