New insight into the enhanced high solid AD performance of dewatered sludge by thermal hydrolysis: specific organic matter degradation and taxonomic, functional and metabolic patterns of microbes
Two lab scale high solid anaerobic digesters fed with untreated sludge (R1) and thermally hydrolyzed sludge (R2) were operated to investigate the influence of thermal hydrolysis on the degradation of specific MOCs,the taxonomic and functional dynamics of microbiomes,as well as their correlation with metabolic pathway during high solid AD of dewatered sludge.R2 was found to have better running performance with enhanced biogas yield (+45.7%),and VS reduction (+41.3%) which was mainly attributed to the enhanced biodegradation of protein (49.0 %) and hemicelluloses (25.0 %).Referring to the reason of this augmentation,the enhanced solubilization of dewatered sludge caused by thermal hydrolysis resulted in the different taxonomic dynamics of bacteria (hydrolysis,acidogenesis and acetogenesis) instead of archeae (methanogenesis) in digester.And the pre-treated dewatered sludge was more appropriate for both bacteria and archaea to grow with an order of magnitude more in population.Along with the changed microbial community in R2 compared to R1,there was significant increase in relative abundance of functional genes involved in amino acid,carbohydrate metabolism and methanogenesis.
High solid AD dewatered sludge thermal hydrolysis organic matters microbes function genes
Sisi Chen Ning Li Bin Dong Xiaohu Dai
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
137-145
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）