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| Anaerobic co-digestion of rice straw after alkali pretreatment with pig manure |
| Received:October 31, 2017 |
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| KeyWord:alkali pretreatment;rice straw;pig manure;anaerobic co-digestion |
| Author Name | Affiliation | E-mail | | FU Jia-qi | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | | | XIA Song | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | xiasongsummer212@163.com | | CHEN Xiao-ping | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | | | FU Yin-xuan | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | | | YAN Heng | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | | | WU Jiu-jiu | Insititute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China | |
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| Abstract: |
| Rice straw was pretreated with different concentrations of NaOH before anaerobic co-digestion with pig manure to study the impact of alkali pretreatment on methane production efficiency. The weight and enzymatic hydrolysis saccharification of pretreated and untreated rice straw were determined. When rice straw was pretreated by 1.5%(W/V) NaOH, the reducing sugar content was as high as 71.6 mg·g-1 rice straw. The scanning electron microscope(SEM) results showed that NaOH pretreatment could loosen the structure of rice straw and cell wall, enlarge specific surface area and increase its bioavailability. The Fourier transform infrared spectroscopy and thermogravimetry results showed that the structure characteristics of rice straw were changed after NaOH pretreatment and the contents of lignin and semicellulose were changed. The methane producing characteristics of anaerobic co-digestion of pretreated rice straw with pig manure were analyzed by automatic methane potential test system Ⅱ. The highest methane production was 327.10 mL·g-1 VS and achieved under 1.5%(W/V) NaOH pretreatment, which was much higher than that of untreated group(P<0.01). The methane production of co-digestion of rice straw after 1.5%(W/V) NaOH pretreatment with pig manure was 340.95 mL·g-1 VS, which was increased by 25.24%(P<0.01) and 4.23%(P<0.05) compared with untreated group and with single pretreated rice straw digestion. 1.5% NaOH pretreatment could effectively improve the rice straw fiber structure and improve methane production efficiency of anaerobic co-digestion with pig manure. |
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