Butyric Acid Fermentation during Ensiling of Wilted Maize Stover for Efficient Methane Production,ACS Sustainable Chemistry & Engineering

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Butyric Acid Fermentation during Ensiling of Wilted Maize Stover for Efficient Methane Production
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-09 , DOI: 10.1021/acssuschemeng.0c00633
Xian Cui ₁ , Hui Sun ₁ , Mostafa Sobhi ₁ , Xinxin Ju ₂ , Jianbin Guo ₁ , Renjie Dong _{1,

3}

Affiliation

The performance of conventional processes for ensiling crop residues for biogas production is usually enhanced with lactic acid fermentation to reduce organic matter (OM) loss. In this study, butyric acid fermentation in the ensiling process of wilted maize stover (WMS) with glucose was directly and indirectly enhanced with Clostridium tyrobutyricum (Glu-CT) and CaCO₃ (Glu-CaCO₃), respectively. The effect of butyric acid fermentation and lactic acid fermentation during ensiling on the subsequent biogas production was investigated. Butyric acid fermentation was successfully enhanced in the Glu-CaCO₃ treatment but not in the Glu-CT treatment. Analysis of storage performance and microbial activity revealed that enhanced butyric acid fermentation triggered synergetic acid hydrolysis and enzymolysis during ensiling and increased the biodegradability of the WMS. The specific methane yield (methane yield_measured) and methane yield_orig (corrected with storage loss) of the 60 d of ensiled WMS in the Glu-CaCO₃ treatment increased by 20.1% and 10.4%, respectively, compared to the values on day 0, which were significantly higher than that of WMS subjected to lactic acid treatment (P < 0.05). The trade-off between OM loss and increased methane yield was positive when the butyric acid fermentation was enhanced during ensiling. Hence, the criteria for conventional ensiling of WMS for biogas production could be reconsidered.

中文翻译：

枯萎玉米秸秆堆存期间的丁酸发酵可有效生产甲烷

乳酸发酵可减少有机物（OM）的损失，通常可以提高农作物残留物用于沼气生产的常规工艺的性能。在这项研究中，丁酸梭菌（Glu-CT）和CaCO ₃（Glu-CaCO ₃）分别直接和间接地增强了在枯萎的玉米秸秆（WMS）包裹过程中丁酸的发酵。研究了青贮过程中丁酸发酵和乳酸发酵对后续沼气生产的影响。在Glu-CaCO _3中成功增强了丁酸发酵治疗，但不在Glu-CT治疗中。对贮藏性能和微生物活性的分析表明，增强的丁酸发酵在青贮过程中触发了协同酸的水解和酶解，并提高了WMS的生物降解能力。与第0天相比，在Glu-CaCO ₃处理中60 d Wsiled WMS的比甲烷产率（_测得的甲烷产_率）和甲烷产率_orig（经存储损失校正）分别增加了20.1％和10.4％。，显着高于乳酸处理的WMS（P<0.05）。当青贮过程中丁酸发酵增强时，OM损失和甲烷产量增加之间的权衡是正的。因此，可以重新考虑用于沼气生产的WMS常规包装标准。

更新日期：2020-04-09

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