초록
<P><B>Abstract</B></P> <P>The effect of hydrothermal pretreatment (HTP) and alkaline thermal pretreatment (TA) at mild temperature in the solid state was comparatively studied, through the analysis of physicochemical properties of rice straw and its biogas production during anaerobic digestion. The results indicated that TA visibly increased the biogas yield from HTP. The accumulative biogas production of volatile solids was the highest for TA3 up to 411.1 mL/g VS, in which increased 24.04% compared to control. Therefore, the use of TA is more favorable to improve biogas production rates of anaerobic fermentation with rice straw than HTP, however, the additives of calcium hydroxide are too high, but it is not conducive to promoting the biogas yield of rice straw. The best additives amount of Ca (OH)<SUB>2</SUB> was 2% to consider the cost of pretreatment with straw. The research results provide technical support for pretreatment of anaerobic fermentation of lingo-cellulosic materials such as straw.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of TA pretreatment on the biogas production rate of straw was more obvious than that of HTP. </LI> <LI> The cumulative gas production rate was the highest (411.1 mL / g) for the 5% calcium hydroxide group. </LI> <LI> The appropriate addition of 2% calcium hydroxide in TA pretreatment group was more economically from the point of view of engineering application. </LI> </UL> </P>