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Two step process for volatile fatty acid production from brewery spent grain: hydrolysis and direct acidogenic fermentation using anaerobic granular sludge
Process Biochemistry ( IF 3.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.procbio.2020.10.011
Juan Castilla-Archilla , Stefano Papirio , Piet N.L. Lens

Abstract Brewery spent grain (BSG) is an industrial waste stream with large potential for biorefining purposes. This work evaluated the production of volatile fatty acids (VFAs) by a two-step process using BSG as renewable feedstock by combining a single direct hydrolysis step (without removing the acid or potential inhibiting compounds) with an acidogenic fermentation step of the carbohydrate rich leachate. For the first step, a thermal diluted acid hydrolysis was carried (20 min at 121 °C), using eighteen different combinations in terms of total solid (TS) of BSG (4, 7 and 10 % w/w) and H2SO4 (0.0, 0.5, 1.0, 1.5, 2.0 and 3.0 % v/v). The 7.0 % TS of BSG and 1.5 % of H2SO4 combination was the most efficient in terms of total carbohydrate recovery (0.44 g of total carbohydrates per gram of TS). For the second step, an acidogenic batch fermentation of the hydrolysate was performed using anaerobic granular sludge at five different pH conditions (uncontrolled pH from an initial pH 7.0, and constant pH controlled at 4.5, 5.0, 6.0 and 8.0). The highest VFAs concentration was obtained at pH 6.0 and reached 16.89 (± 1.33) g COD/L, composed of mainly (99.5–99.8 %) acetate and butyrate.

中文翻译:

从啤酒废粮中生产挥发性脂肪酸的两步法:使用厌氧颗粒污泥水解和直接产酸发酵

摘要 啤酒厂废谷物 (BSG) 是一种工业废物流,具有用于生物精炼的巨大潜力。这项工作通过将单一的直接水解步骤(不去除酸或潜在抑制化合物)与富含碳水化合物的浸出液的产酸发酵步骤相结合,使用 BSG 作为可再生原料,通过两步法评估了挥发性脂肪酸 (VFA) 的生产。 . 对于第一步,进行热稀酸水解(121 °C 下 20 分钟),使用 BSG(4、7 和 10% w/w)和 H2SO4(0.0 、0.5、1.0、1.5、2.0 和 3.0% v/v)。7.0% TS 的 BSG 和 1.5% 的 H2SO4 组合在总碳水化合物回收方面最有效(每克 TS 有 0.44 克总碳水化合物)。对于第二步,水解产物的产酸分批发酵是使用厌氧颗粒污泥在五种不同的 pH 条件下进行的(初始 pH 为 7.0 的不受控制的 pH,以及控制在 4.5、5.0、6.0 和 8.0 的恒定 pH)。最高 VFA 浓度在 pH 6.0 时获得,达到 16.89 (± 1.33) g COD/L,主要由 (99.5–99.8%) 乙酸盐和丁酸盐组成。
更新日期:2021-01-01
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