不同含固率和接种比对尾菜厌氧消化的影响

Effects of Total Solids Content and Inoculation Ratio on Anaerobic Digestion of Vegetable Waste

文章通过尾菜中温批式厌氧消化实验,研究不同含固率(4%,8%)和接种比(RI/S=0.8,1.0,1.2)对尾菜厌氧消化产气特性的影响。结果表明,累计甲烷产量随含固率的提高而增加,随接种比的提高而降低,在含固率为8%,接种比为0.8时,累计甲烷产量最大,达到253.81 mL·g^-1VS。含固率一定时,接种比越高,越有利于缩短厌氧消化周期,但会降低累计甲烷产量;接种比一定时,含固率越高,产甲烷延滞期越长,累计甲烷产量越高。厌氧消化第9天各处理组均开始出现不同程度的丙酸积累现象,含固率为8%,接种比为0.8时,丙酸浓度最高可达1981.522 mg·L^-1。含固率越低,接种比越高,越有利于丙酸降解。厌氧消化第33天时,各处理组丙酸全部被转化利用。

To investigate the effects of different total solids content(4%,8%)and inoculation ratio(RI/S=0.8,1.0,1.2)on the mesophilic anaerobic digestion of vegetable waste,batch experiments were conducted.Results showed that the cumulative methane yield increased with the increase of the total solids content and decreased with the increase of the inoculation ratio.The cumulative methane yield was the highest when the solids content was 8%and the inoculation ratio was 0.8,reaching 253.81 mL·g^-1VS.It was observed that,when the solids content was fixed,the higher the inoculation ratio,the shorter the anaerobic digestion cycle,but the lower the cumulative methane production.And under a certain inoculation ratio,the higher the solids content,the longer the prolonged methane production period and the higher the cumulative methane production.On the 9th day of anaerobic digestion,propionic acid accumulation began to occur in all treatment groups.The propionic acid concentration reached up to 1981.522 mg·L^-1 when the solid content was 8%and the inoculation ratio was 0.8.The lower the solids content,the higher the inoculation ratio,the better propionic acid degradation.On the 33rd day of anaerobic digestion,all propionic acid in each treatment group was converted.