초록
Anaerobic biodegradation of rice straw wastes for H<SUB>2</SUB> production via mesophillic up-flow anaerobic staged reactor (UASR) was investigated. Two batch experiments were carried out. The 1st experiment was conducted to assess the effect of pre-acidification process on H<SUB>2</SUB> production rate (R<SUB>m</SUB>). The results showed that the maximum R<SUB>m</SUB> of 136.64mlH<SUB>2</SUB>/h was achieved for pre-acidified (0.72%) rice straw waste, which was approximately 28.64-fold greater than that in untreated rice straw. The H<SUB>2</SUB> content in the biogas was 52.0% and there was no significant methane observed in this study. The pre-acidified rice straw was used for subsequent experiments concerning the influences of environmental factors such as pH, contact time, and substrate concentration on H<SUB>2</SUB> yield (HY). Trends indicate that both high and low-end pH is unfavorable and substrate concentration of 30 g COD/l and contact time of 30 h is recommended for H<SUB>2</SUB> production from pre-acidified rice straw.