Strategy of controlling the volumetric loading rate to promote hydrogen-production performance in a mesophilic-kitchen-waste fermentor and the microbial ecology analyses
2011
Li, Shiue-Lin | Lin, Jian-Sheng | Wang, Yu-Hsuan | Lee, Ze-Kun | Kuo, Shih-Chiang | Tseng, I-Cheng | Cheng, Sheng-Shung
The kitchen waste was chosen as a high solid (42gL⁻¹ of volatile suspended solid, VSS) and high organic (107gL⁻¹ of chemical oxygen demand) feedstock for operating a 3-L mesophilic fermentor. The greatest specific hydrogen production rate ( [Formula: see text] ) was observed in Stage 3 as 3.4L-H₂L⁻¹day⁻¹ with a volumetric loading rate (VLR) of 100g-CODL⁻¹day⁻¹; the highest hydrogen yield was observed in Stage 2 as 96mL-H₂g⁻¹ of influent VSS with a VLR of 46g-CODL⁻¹day⁻¹. In Stages 1 (with a VLR of 27g-CODL⁻¹) and 2, the sum of Butyrivibriofibrisolvens and Clostridiumproteoclasticum is dominant, but in Stage 3, Olsenellagenomosp, became dominant and constituted 44% of the entire population. The dependence of VLR and [Formula: see text] could be regressed as a linear equation of [Formula: see text] .
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