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Characteristics of Mixed Fermentation by Alternanthera Philoxeroides and Corn Stalk for Biogas Production
Abstract:
In order to alleviate the shortage of raw materials in rural household biogas production and promote utilization of the formidable alien invasive species-alternanthera philoxeroides, mixed fermentation by alternanthera philoxeroides and corn stalk was designed and the performance was investigated in separated and different dry matter ratios (18.33, 6.25 and 3.46) treatments, by batch model at (35±1)°C.Results indicated that, the best biogas production appeared in the treatment of dry matter ratio of 6.25 when total solid (TS) loading of raw material was 8% and inoculating amount of biogas slurry was 20%, with TS and volatile solid (VS) biogas yields, and methane content of 325.74±5.11 mL/g, 456.06±4.87 mL/g and 60.56±1.23 %, respectively. Highly significant positive correlations (p˂0.01) were found between degradation rate of VS and four indexes such as average daily biogas yield, TS biogas yield, VS biogas yield and rate of change of total organic carbon (TOC) of fermentation liquid, while positive correlation between degradation rate of VS and methane content, and negative correlation between it and rate of change of volatile fatty acid (VFA), were not significant (p>0.05). Mixed fermentation by alternanthera philoxeroides and corn stalk could improve biogas production and achieve the gas peak in advance, therefore it had good feasibility.
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208-214
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September 2013
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© 2013 Trans Tech Publications Ltd. All Rights Reserved
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