2009•Anhui nongye kexueRequires access
Effects of Stirring on Semi-dry Anaerobic Digestion of Pig Dung for Biogas Production
Cheng Yang
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Abstract
[Objective] The research aimed to study the effects of stirring on semi-dry anaerobic digestion of pig dung for biogas production.[Method] Stirring at 200 r/min was set during slow and recessionary phases in semi-dry batch performed at 35 ℃,to research its experimental effects in pig dung anaerobic digestion for biogas production.[Result] The results showed that COD degradative rate was 91.96 % after anaerobic digestion 45 d and biogas production rate was 0.148 ml/kg,but daily biogas yield change was large in fast-production phase.Gas production speed enhanced 1.04 ml/(min·kg),temperature rose,and pH value descended by stirring 5 min in slow-production phase.Stirring 10 min phase was better than 5,15 min for anaerobic digestion in recessionary.[Conclusion] The stirring manner of continuing 5 min and pausing 50 min in a cycle can make biogas production emit in time.