Bio-pretreatment promote hydrolysis and acidification of oilseed rape straw: Roles of fermentation broth and micro-oxygen.,Bioresource Technology

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Bio-pretreatment promote hydrolysis and acidification of oilseed rape straw: Roles of fermentation broth and micro-oxygen.
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.biortech.2020.123272
Chuqiao Wang ₁ , Jiajie Zhang ₁ , Fengping Hu ₁ , Shuai Zhang ₂ , Ji Lu ₃ , Shuai Liu ₄

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Oilseed rape straw (ORS) is capable of producing renewable energy. However, cellulose, hemicellulose and lignin are intertwined together in ORS, which makes it difficult for anaerobic digestion (AD). Hence, pretreatment is the key factor in reducing the rate-limiting step of AD. This study reports that the pretreatment combined fermentation broth and micro-oxygen could enhance the degradation of ORS. The maximum biodegradation ratios of cellulose, hemicellulose, and lignin (CHL) were 20.6%, 18.1%, and 24.7%, respectively, at 120 mL/gVS/d oxygen load. The maximum volatile fatty acids and soluble chemical oxygen demand of hydrolysis and acidification of the pretreated groups were significantly higher than that of the control groups. Microorganisms in the fermentation broth at micro-aerobic conditions led to the reduction of CHL content, and altered the structure of ORS. The fermentation broth bio-pretreatment could effectively decrease the functional groups related to lignin.

中文翻译：

生物预处理可促进油菜籽秸秆的水解和酸化：发酵液和微氧气的作用。

油菜籽秸秆（ORS）能够产生可再生能源。但是，纤维素，半纤维素和木质素在ORS中相互缠绕在一起，这使得厌氧消化（AD）变得困难。因此，预处理是减少AD限速步骤的关键因素。这项研究报告表明，将发酵液和微氧联合进行预处理可以增强ORS的降解。在120 mL / gVS / d的氧气负荷下，纤维素，半纤维素和木质素（CHL）的最大生物降解率分别为20.6％，18.1％和24.7％。预处理组水解和酸化的最大挥发性脂肪酸和可溶性化学需氧量显着高于对照组。在有氧条件下发酵液中的微生物导致CHL含量降低，并改变了ORS的结构。发酵液的生物预处理可以有效降低木质素相关的官能团。

更新日期：2020-03-30

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