Abstract: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.