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| Effects of MC1 pretreatment on hydrolysis characteristics and methane production efficiency of soybean straw |
| Received:April 20, 2020 |
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| KeyWord:composite microbial system MC1;soybean straw;microbial pretreatment;anaerobic digestion;dynamic property |
| Author Name | Affiliation | E-mail | | CAO Yan-zhuan | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | ZHANG Hai-bo | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | SU Wan | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | CHENG Hong-yan | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | YAN Shuang-dui | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | BU Yu-shan | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | CUI Zong-jun | College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China | | | LI Jia-jia | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | aepi_ljj@126.com |
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| Abstract: |
| To improve the performance of anaerobic fermentation of soybean straw, sterilized straw(SS)and unsterilized straw(NSS)were pretreated by MC1, and the effects of pretreatment time on hydrolysis characteristics and methane production efficiency were studied. The results showed that MC1 could effectively degrade soybean straw. After 12 days of pretreatment, the degradation rates of cellulose and lignin were 41.71% and 29.92%, respectively, significantly higher than that of NSS(P<0.05). The VFAs content of the SS pretreatment system(2.18 g·L-1)was significantly higher than that of the NSS system(1.52 g·L-1)(P<0.05). Acetic acid was the primary VFA product in the pretreatment system, and the ratio of acetic acid and VFAs was higher than 72.41%(SS)and 56.23%(NSS), respectively. The cumulative methane yield of SS and NSS after a 3-day pretreatment increased by 36.86% and 34.27%, respectively, compared to untreated soybean straw. The maximum methane production rates of SS and NSS were 21.69 mL·d-1·g-1 VS and 17.44 mL·d-1·g-1 VS, respectively, indicating that MC1 pretreatment effectively improves the anaerobic fermentation performance of soybean straw. |
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