Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Junya Zhang; Chen Lv; Juan Tong; Jianwei Liu; Jibao Liu; Dawei Yu; Yawei Wang; Meixue Chen; Yuansong Wei

doi:10.1016/j.biortech.2015.10.037

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Bioresour Technol. 2016 Jan:200:253-61. doi: 10.1016/j.biortech.2015.10.037. Epub 2015 Oct 19.

Authors

Junya Zhang¹, Chen Lv², Juan Tong¹, Jianwei Liu², Jibao Liu¹, Dawei Yu¹, Yawei Wang¹, Meixue Chen¹, Yuansong Wei³

Affiliations

¹ State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
³ State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: yswei@rcees.ac.cn.

PMID: 26496214
DOI: 10.1016/j.biortech.2015.10.037

Abstract

The effects of microwave pretreatment (MW) on co-digestion of food waste (FW) and sewage sludge (SS) have never been investigated. In this study, a series of mesophilic biochemical methane potential (BMP) tests were conducted to determine the optimized ratio of FW and SS based on MW, and the evolution of bacterial and archaeal community was investigated through high-throughput sequencing method. Results showed that the optimized ratio was 3:2 for co-digestion of FW and SS based on MW, and the methane production was 316.24 and 338.44mLCH4/gVSadded for MW-FW and MW-SS, respectively. The MW-SS was superior for methane production compared to MW-FW, in which accumulation of propionic acid led to the inhibition of methanogenesis. Proteiniborus and Parabacteroides were responsible for proteins and polysaccharides degradation for all, respectively, while Bacteroides only dominated in co-digestion. Methanosphaera dominated in MW-FW at the active methane production phase, while it was Methanosarcina in MW-SS and mono-SS.

Keywords: Anaerobic co-digestion; Archaeal community; Bacterial community; Food waste; Sewage sludge.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Anaerobiosis
Biotechnology
Food*
Microwaves*
Sewage* / chemistry
Sewage* / microbiology
Waste Disposal, Fluid / methods*

Substances

Sewage