Effect of Hydraulic Retention Time on Mixed Anaerobic Fermentation of Cow Manure and Cabbage Tail
Biogas production by anaerobic fermentation is an effective means to treat organic wastes.Cow manure is a common agricultural waste.Due to the high hydraulic retention time(HRT)required to degrade a large number of refractory components during anaerobic fermentation,the fermentation efficiency is low.The mixed fermentation with cabbage tail which is easy to degrade can effectively increase methane production,and the efficiency of methane fermentation can be improved by reducing HRT.In this study,a fully mixed reactor(CSTR)was used to simulate the operation of biogas engineering fermenter,and the effect of HRT(25,20,15,10,8,5 d)on the mixed anaerobic fermentation of cow manure and tail vegetable was investigated for the first time.The results showed that when HRT was 25 days,the highest methane yield was 185 mL·g-1,and the reduction of HRT resulted in a significant decrease in methane yield.When HRT decreased to 5 days,the reactor operation failed due to the accumulation of volatile organic acids.When the limiting HRT of the system is 8 d,the maximum methane yield of the system is 0.86 L·(L·d)-1.The research results can provide a reference for coordinating methane yield and volumetric methane yield in practical biogas engineering,so as to select the appropriate HRT.
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