Effect of temperature on anaerobic fermentative hydrogen gas production from feedlot cattle manure using mixed microflora |
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Authors: | Brandon H Gilroyed Chi Chang Angus Chu Xiying Hao |
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Affiliation: | 1. Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Ave South, Lethbridge, Alberta T1J 4B1, Canada;2. Department of Civil Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada |
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Abstract: | Hydrogen production from the anaerobic fermentation of feedlot cattle manure was examined in batch cultures over a temperature range from 36 to 60 °C at a pH of 5.2. The amount of hydrogen produced increased with temperature to a maximum of 65 L H2 kg TS−1 at 52 °C. At temperatures > 52 °C, acetate was the main volatile fatty acid (VFA) accumulated, while at <52 °C butyrate accumulated the most. Formate was detected in the 56 and 60 °C treatments but was absent in all others. Thermophilic conditions resulted in the highest hydrogen production rates, with maximum hydrogen production occurring 52 °C. Changing incubation temperature by small (4 °C) increments up or down from 52 °C resulted in changes in the metabolic flux (conversion of substrate to VFA and gaseous products) of the anaerobic digestion system. These findings indicate that the hydrogen production potential of anaerobic systems utilizing heat treated cattle manure as inoculum is affected greatly by incubation temperature. |
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Keywords: | Hydrogen production Fermentation Cattle manure |
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