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KMID : 0545120110210070746
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Journal of Microbiology and Biotechnology
2011 Volume.21 No. 7 p.746 ~ p.752
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Enhancing the Anaerobic Digestion of Corn Stalks Using Composite Microbial Pretreatment
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Xufeng Yuan
Peipei Li
Hui Wang
Xiaofen Wang
Xu Cheng
Zongjun Cui
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Abstract
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A composite microbial system (XDC-2) was used to pretreat and hydrolyze corn stalk to enhance anaerobic digestion. The results of pretreatment indicated that sCOD concentrations of hydrolysate were highest (8,233 mg/l) at the fifth day. XDC-2 efficiently degraded the corn stalk by nearly 45%, decreasing the cellulose content by 22.7% and the hemicellulose content by 74.1%. Total levels of volatile products peaked on the fifth day. The six major compounds present were ethanol (0.29 g/l), acetic acid (0.55 g/l), 1,2-ethanediol (0.49 g/l), propionic acid (0.15 g/l), butyric acid (0.22 g/l), and glycerine (2.48 g/l). The results of anaerobic digestion showed that corn stalks treated by XDC-2 produced 68.3% more total biogas and 87.9% more total methane than untreated controls. The technical digestion time for the treated corn stalks was 35.7% shorter than without treatment. The composite microbial system pretreatment could be a cost-effective and environmentally friendly microbial method for efficient biological conversion of corn stalk into bioenergy.
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KEYWORD
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composite microbial system, biogas, pretreatment, hydrolysate, anaerobic digestion
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