Abstract
Effect of organic loading rate (OLR) on the continuous biological H2 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. H2 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, H2 production increased with OLR at the range of 7.1–21.4gCOD/ld, and reached the maximum H2 production of 2.6l/d. However, the H2 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.
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