Research on specific methanogenic activity of circulate biogas slurry in anaerobic fermentation system
厌氧发酵系统中回流沼液的产甲烷活性研究

In order to obtain the reasonable sludge circulation period, specific methanogenic activity of biogas slurry produced by two-stage anaerobic fermentation system was studied. Methanogenic activities were measured according to different days (0~5 days) stored in storage tanks of biogas slurry, and he maximum specific methanogenic activity, which was determined by batch tests, was used as the index measuring methanogenic activity of anaerobic sludge. The results indicated that specific methanogenic activity of discharging biogas slurry differed in different periods of time, and the methanogenic activity reached the maximum when biogas slurry was set for 2 days. The second day for the biogas slurry entering into storage tanks is the reasonable circulation period of sludge discharged from two-stage anaerobic fermentation system.It will provide a theoretic basis for sludge circulation process mixed by online activated sludge and the optimal period activated sludge of storage tanks.