title: Biohydrogen production from cattle wastewater by enriched anaerobic mixed consortia: influence of fermentation temperature and pH.
abstract: Experiments were conducted to select a natural mixed microflora seed source and investigate the effect of temperature and pH on fermentative hydrogen (H2) production from cattle wastewater by sewage sludge. Sewage sludge was shown to have higher cumulative H2 production than other inoculum collected from cow dung compost, chicken manure compost, and river sludge. Experimental results show that H2 production from cattle wastewater was significantly affected by both pH and temperature of the culture. The maximum H2 yield was obtained at pH 5.5. H2 yield and the ratio of butyrate/acetate (Bu/Ac) followed a similar production trend, suggesting that butyrate formation might favor H2 production. The optimal temperature for H2 production from cattle wastewater was 45 degrees C with peak values of H2 production (368 ml), hydrogen yield of 319 ml H2/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 H2 production and bacterial growth.
authors.affiliation: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, PR China.
authors.forename: Gui-Lan
authors.initials: GL
authors.lastname: Tang
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Zhen-Jun
authors.initials: ZJ
authors.lastname: Sun
authors.forename: Qin-Qing
authors.initials: QQ
authors.lastname: Tang
authors.forename: Chun-Hao
authors.initials: CH
authors.lastname: Yan
authors.forename: Guang-Qing
authors.initials: GQ
authors.lastname: Liu
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D001711:Biotransformation; D002417:Cattle / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D018920:Coculture Techniques; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control*; D013696:Temperature; D014873:Water Pollutants / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
chemical_list: D007220:Industrial Waste; D014873:Water Pollutants; D006859:Hydrogen