Rice straw (RS) is one of abundant agricultural waste for biogas production in China. However, the low carbon-methane conversion rate limits its wide application due to the low degradation rate of RS during fermentation. This study investigated the effect of acclimatized paddy soil microorganisms using swine wastewater on degradation of RS before anaerobic digestion. The total organic carbon, reducing sugar and NH4+-N content of paddy soil + RS + swine wastewater (PRS) (653.50 mg/L) was higher than that of other groups after 19 days. The carboxymethyl cellulose activity (4.01 IU), cellulose/lignin ratio (5.25) and the degradation rate of lignin (51.96%) in PRS were higher than those of other groups. The Firmicutes (21.02%), Chloroflexi (12.48%), Proteobacteria (20.92%), and Bacteroidetes (25.78%) were the main fermentation phyla in PRS during acclimatization. These results indicated that the acclimatized paddy soil microorganisms using swine wastewater (SW) could degrade RS more efficiently.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 21878139); the Key Research and Development Program of Jiangxi Province in China (2020BAB203012 and 20181BBF60026); The research project of State Key Laboratory of Food Science and Technology, Nanchang University in China (Project No. SKLF-ZZB-201915); Postdoctoral Project of Jiangxi Province in China (2020RC08).
- Paddy soil
- Rice straw
- Swine wastewater
PubMed: MeSH publication types
- Journal Article