高温碱间歇式处理对互花米草厌氧发酵特性的影响

以互花米草为原料,采用中温(35±1)℃批式发酵的方式,考察了NaOH高温碱间歇式处理对互花米草厌氧消化过程的影响.结果表明,互花米草一次发酵至产气停止,单位TS产气量为263mL/g,发酵过程中出现酸化现象, pH值最低为5.17.二次发酵原料为一次发酵后的固体残余物,主要组分为可分解有机物以及一些难分解有机物,过程中未出现酸化现象, pH值经短暂下降后很快稳定在7.5左右,累积产气量在一次发酵的基础上提高了46%.互花米草单位TS产气量为383mL/g.消化液中有机酸乙酸含量最大,丙酸和丁酸含量相当.

Effect of intermittent treatment with hot-NaOH solution on anaerobic digestion of spartina alterniflora

The effect of intermittent NaOH solution treatment on anaerobic digestion of Spartina alterniflora was studied by batch experiments at (35±1)℃. The rate of gas production during the first anaerobic digestion process was 263mL/g, and acidification was observed. To improve the gas yield of anaerobic digestion of Spartina alterniflora, hot-NaOH solution was applied to the fermented Spartina alterniflora, which was then subjected to secondary anaerobic digestion. The results showed that the rates of gas production in the second anaerobic digestion were found to be 120mL/g .In comparison with the first anaerobic digestion process, the gas production further improved by 46% upon intermittent NaOH solution treatment. Acetic acid accounts for a large proportion in the fermented liquid while propionic and butyric acid were equivalent. The present study demonstrates that enhanced gas production could be achieved using the intermittent NaOH solution treatment.