[Anaerobic sequencing batch reactor for the digestion of thermo-hydrolyzed sludge under thermophilic and mesophilic conditions].

Parallel laboratory experiments were conducted to investigate the performance of thermophilic and mesophilic anaerobic sequencing batch reactor (ASBR) for the digestion of thermo-hydrolyzed sewage sludge. The average total COD (TCOD) removal rates of thermophilic, mesophilic ASBR at 10-day HRT and 5.42 kg/(m3 x d) TCOD loading rate were 56.20% and 61.66%, and the biogas production rates of TCOD in feeding sludge were 199 and 219 mL/g, respectively. ASBR has the unique capability of maintaining high-solid content and keeping a high solid retention time (SRT). The average SRT of thermophilic, mesophilic ASBR were 30 and 37d, respectively. Compared to mesophilic ASBR, thermophilic ASBR show considerably fewer microbial morphologies and lower methane-production, which might result in a relatively lower treatment efficiency in thermophilic ASBR than that in mesophilic ASBR.