| Summary: | 碩士 === 逢甲大學 === 化學工程學所 === 100 === Hydrogen energy is clean and recognized as an ideal alternative energy in the future. Biohydrogen production is clean and promising bioenergy because hydrogen can be produced from biomass or organic wastes via fermentation. To reduce the medium cost for more commercially viable H2 production, beverage factory wastewater was used as feedstock to produce H2 via dark fermentation.
First, The CSTR reactors were operated by three waste beverages (juice drink, Coca-cola and Slurpee) under HRT 8 h. The results showed that the better HPR and HPE were 0.916 mol/L/d and 47.9%, when Coca-cola was in use.
Then the CSTR reactors were operated at various substrate concentration (20、25、30 and 40 g TS/L) to investigate the performance of hydrogen production at various HRTs (8、6 and 4 h). The results showed that the best HPE occurred at 25 g TS/L and HRT 6 h, giving a HPE of 51.2%. It is important to maintain a appropriate operation condition in order to biological hydrogen production.
Cell washout is a common phenomenon in traditional CSTR systems when they are operated at a low HRT (≦4 h), resulting in a severe decrease in H2 production efficiency. To enhance H2 production efficiency, an agitated granular sludge bed (AGSB) developed from our laboratory was used to produce H2 from waste beverages. For AGSB system, the effect of addition of powdered activated carbon (PAC) on bioreactor start-up was first investigated. The results show that when the reactor was started up at HRT = 4 h, PAC addition was favorable for reactor start up with an improved sludge granulation and H2 production efficiency.
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