초록
<P><B>Highlights</B></P><P>► Up-flow anaerobic reactor (UAR) is a promising reactor for biohydrogen production from pretreated rice straw. ► Organic loading rate showed significant influence on overall H<SUB>2</SUB> yield, carbohydrate and COD conversion. ► H<SUB>2</SUB> yield was 95.5, 117 and 107.1mmol/d at OLR of 7.1, 21.4 and 26gCOD/ld, respectively. ► The carbohydrate removal increased from 57.8% to 82% when the OLR was increased from 7.1 to 26gCOD/ld.</P> <P><B>Abstract</B></P><P>Effect of organic loading rate (OLR) on the continuous biological H<SUB>2</SUB> production from pretreated rice straw waste using a mesophilic up-flow anaerobic reactor (UAR) was investigated for 140d. OLR was varied from 7.1 to 26gCOD/ld. H<SUB>2</SUB> yield was significantly increased from 95.5 to 117mmol/d, when OLR was largely increased from 7.1 to 21.4gCOD/ld, respectively. However, further increase in OLR up to 26gCOD/ld, showed a decreasing trend to 107.1mmol/d. Likewise, H<SUB>2</SUB> production increased with OLR at the range of 7.1–21.4gCOD/ld, and reached the maximum H<SUB>2</SUB> production of 2.6l/d. However, the H<SUB>2</SUB> production started to decrease with the further increase of OLR, and dropped to 2.2l/d at OLR of 26gCOD/ld. The COD and carbohydrate removal efficiency were over 70% and 80% at OLRs of 7.1–21.4gCOD/ld, and decreased thereafter.</P>