Abstract
To improve the gas production ability, relatively low cost H3PO4 was chosen as the pretreating agent in this study. Rice straws were pretreated by four different weight percentages (2%, 4%, 6% and 8%) of H3PO4 retting for seven days in an biochemical incubator at (25±1) °C, and the effects with different conditions of H3PO4 pretreatment on anaerobic digestion of rice straws for variation of components and anaerobic digestion performance (under temperature of (35±1) °C) were studied. The results showed that the peak value of biogas production was attained on the 1st day for using 6% H3PO4 pretreatment on rice straw, which is 2284 mL. The test daily methane content of different pretreatment conditions mainly ranges from 3.8% to 43.1%, with the highest recorded at the 12th day of the 2% H3PO4- treated rice straw. The cumulative biogas production of 6% H3PO4 pretreatment was the highest, about 16 474 mL.
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