Biohydrogen Production from Cattle Wastewater by Enriched Anaerobic Mixed Consortia : Influence of Fermentation Temperature and pH(ENVIRONMENTAL BIOTECNOLOGY)

概要

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Experiments were conducted to select a natural mixed microflora seed source and investigate the effect of temperature and pH on fermentative hydrogen (H_2) production from cattle wastewater by sewage sludge. Sewage sludge was shown to have higher cumulative H_2 production than other inoculum collected from cow dung compost, chicken manure compost, and river sludge. Experimental results show that H_2 production from cattle wastewater was significantly affected by both pH and temperature of the culture. The maximum H_2 yield was obtained at pH 5.5. H_2 yield and the ratio of butyrate/acetate (Bu/Ac) followed a similar production trend, suggesting that butyrate formation might favor H_2 production. The optimal temperature for H_2 production from cattle wastewater was 45℃ with peak values of H_2 production (368 ml), hydrogen yield of 319 ml H_2/g chemical oxygen demand (COD) consumed, and butyrate/acetate ratio of 1.43. Presence of ethanol and propionic acid indicated decreased hydrogen production; their concentrations were also affected by pH and temperature. A modified Gompertz model adequately described H_2 production and bacterial growth.
社団法人日本生物工学会の論文
2008-07-25