Inhibition of anaerobic digestion by dissolved lignin derived from alkaline pre-treatment of an aquatic macrophyte
Inhibition of anaerobic digestion by dissolved lignin derived from alkaline pre-treatment of an aquatic macrophyte
复制标题
DOI：
10.1016/j.cej.2016.11.076
复制
发表时间：
2017-03-01
影响因子：
15.1
通讯作者：
Toda, Tatsuki
中科院分区：
文献类型：
--
作者：
Koyama, Mitsuhiko;Yamamoto, Shuichi;Toda, Tatsuki
化学预处理脱木质素可提高木质纤维素生物质的厌氧消化率，但其副产物可能抑制消化过程。本文研究了溶解木质素对厌氧消化过程中产甲烷、产酸和水解三个步骤的抑制作用。溶解的木质素提取富含木质素的水生植物，厌氧毒性试验进行了分批模式下溶解的木质素浓度为0，0.5，1.0，2.5，和5.0克L-1的中温条件下。在产甲烷和产酸活性中，分别观察到对对照的高达15%和10%的轻微减少，在溶解的木质素浓度为5.0 g L-1。相比之下，水解效率在溶解的木质素浓度为1.0 g L-1时相对于对照下降了25%，并且在溶解的木质素浓度为5.0 g L-1时相对于对照下降了35%。这些结果表明，纤维素的酶促水解是厌氧消化过程中最容易受到溶解的木质素抑制的步骤。(C)© 2016 Elsevier B. V.版权所有。
Delignification by chemical pre-treatment improves the anaerobic digestibility of lignocellulosic biomass, but the by-products can potentially inhibit the digestion process. The present study investigates the inhibitory effect of dissolved lignin on three steps of anaerobic digestion: methanogenesis, acidogenesis, and hydrolysis. Dissolved lignin was extracted from a lignin-rich aquatic macrophyte, and anaerobic toxicity tests were performed in batch mode at dissolved lignin concentrations of 0, 0.5, 1.0, 2.5, and 5.0 g L-1 under mesophilic conditions. Minor reductions of up to 15% and 10% against the control were observed in methanogenic and acidogenic activities, respectively, at a dissolved lignin concentration of 5.0 g L-1. By contrast, hydrolysis efficiency dropped by 25% against the control at a dissolved lignin concentration of 1.0 g L-1 and dropped by 35% against the control at a dissolved lignin concentration of 5.0 g L-1. These results suggest that enzymatic hydrolysis of cellulose is the step that is most susceptible to inhibition by dissolved lignin in the anaerobic digestion process. (C) 2016 Elsevier B.V. All rights reserved.