`热水解对污泥高温厌氧消化产气及群落结构的影响

Effect of THP on Gas Production Performance and Microbial Community Structure of Excess Sludge with Thermophilic Anaerobic Digestion Treatment

针对剩余污泥厌氧消化效率及产气量低的问题,采用热水解(THP)技术对剩余污泥进行预处理,然后进行55℃高温厌氧消化,考察对产气性能及微生物群落结构的影响。THP预处理可以有效提高剩余污泥高温厌氧消化的产气性能,在反应时间为16 d时,厌氧消化总产气量增加了39.14%;反应时间为8 d时,厌氧消化产气量提高了36.36%。经THP预处理后,厌氧消化系统功能微生物的多样性略有下降,群落的丰富度指数由未经THP预处理的2.32降为1.81;但系统微生物的群落组成及优势微生物的数量均发生了明显变化,群落结构的变化是厌氧消化产气量增加的微生物学基础。

Release of organic matter in excess sludge cells is one of the major bottlenecks in limit- ing the anaerobic digestion efficiency. THP （Thermal Hydrolysis Pretreatment） technology was used as pretreatment process, followed by 55℃ thermophilic anaerobic digestion, to investigate the effect of THP on biogas production and microbial community structure. The results showed that THP pretreatment could effectively improve the sludge biogas production performance of thermophilic anaerobic digestion. The to- tal gas production increased by 36.36% and 39.14% respectively when the reaction time was 8 days and 16 days. After pretreatment of THP, functional microbial diversity of anaerobic digestion system de- creased slightly. The community abundance index decreased from 2.32 to 1.81, but the number of spe- cies composition and dominant microbial communities had changed significantly. The change of communi- ty structure was the microbiology basis of anaerobic digestion gas production increased.