Journal
BIORESOURCE TECHNOLOGY
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124497
Keywords
Enrichment; Waste sewage sludge; Cellulose; Methane production; Microbial communities
Funding
- Sichuan Science and Technology Program [2018SZ0283, 2020YFH0021]
- Agricultural Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences (CAAS-ASTIP-2016-BIOMA)
- Japan Science and Technology Agency [JPMJAS2004]
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Enrichment of waste sewage sludge without carboxymethylcellulose (CMC) addition was found to be more beneficial for promoting anaerobic digestion (AD) of cellulose, leading to higher methane production and increased anaerobic biodegradation of cellulose compared to enriched sludge with CMC addition.
Low ability of waste sewage sludge to degrade cellulose is observed due to its less cellulolytic bacteria content. The enrichment of sewage sludge in the absence or presence of carboxymethylcellulose (CMC) was conducted to improve anaerobic digestion (AD) of cellulose in this study. Compared to initial sewage sludge (IS), enriched sludge without CMC addition (ES) displayed 69.81% higher CH4 yield and about 1.7-fold greater anaerobic biodegradation of cellulose. In particular, bacterial and archaeal diversities in samples inoculated with ES were significantly altered, with Ruminiclostridium and Methanobacterium as the predominant genera. Enriched sludge with CMC addition (ESC) displayed enhanced methane production at initial cellulose fermentation but showed no distinct difference compared with the control after incubation 24 days. These findings suggest that enrichment of waste sewage sludge without CMC addition is more beneficial for promoting AD of cellulose, providing a novel insight for efficient energy utilization of lignocellulosic wastes.
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