Article

Biohydrogen production from cattle wastewater by enriched anaerobic mixed consortia: influence of fermentation temperature and pH.

College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, PR China.
Journal of Bioscience and Bioengineering (impact factor: 1.79). 08/2008; 106(1):80-7. DOI:10.1263/jbb.106.80 pp.80-7
Source: PubMed

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.

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Keywords

319 ml H2/g chemical oxygen demand
 
bacterial growth
 
Bu/Ac
 
butyrate formation
 
butyrate/acetate ratio
 
cattle wastewater
 
chicken manure compost
 
concentrations
 
cow dung compost
 
fermentative hydrogen
 
H2 production
 
higher cumulative H2 production
 
hydrogen production
 
hydrogen yield
 
maximum H2 yield
 
modified Gompertz model
 
natural mixed microflora seed source
 
optimal temperature
 
Sewage sludge
 
similar production trend
 

Gui-lan Tang