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Total-solids-controlled microbial response and volatile fatty acids production in sludge and chicken manure
Daojing Zeng1, Mengsha Ma1, Xiao Huang2
1Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Abstract:
With the aim of exploring the association between microbial response and volatile fatty acids (VFAs) production in sludge and chicken manure co-fermentation with total solids (TS) controlled, four fermentation experimental groups (TS = 20, 40, 60, and 80 g/L) were established in this study. The results demonstrated that the yield of VFAs reached the peak (530.08 mg COD/g VSS) at the 40 g-TS group. For microbial characteristics, Firmicutes, Bacteroidota, Spirochaetota, and Proteobacteria were the main dominant phyla in each experimental group. Meanwhile, it could be proven that the enrichment of functional strains had a significant effect on the production and accumulation of VFAs at the 40 g-TS group through α analysis and microbial community structure analysis. In addition, Bacteroidota was predicted to be the main producer of VFAs in the experimental co-fermentation systems through the Faprotax function prediction. This study revealed the effects of different TS concentrations on microbial communities in sludge and chicken manure co-fermentation, and investigated the relationship between microbial community and VFAs production.
