Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment
Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment
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通过等离子体辅助预处理改善小麦秸秆的厌氧消化
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Schmidt
中科院分区：
文献类型：
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作者：
S. Heiske;Nadja Schultz;Nadja Schultz;F. Leipold;J. Schmidt
木质纤维素生物质的等离子体辅助预处理（PAP）已被证明是分解木质素并因此促进微生物接近纤维素和半纤维素的有效方法。在本研究中，PAP的适用性，以提高生物转化小麦秸秆甲烷进行了测试。在嗜热分批实验中，甲烷产率高达366 mL/g挥发性固体（VS），占产率增加45%。PAP后未检测到常见的木质素衍生的抑制剂如5-羟甲基糠醛（5-HMF）和糠醛，但毒性测试在较高的底物浓度下导致较低的甲烷产率，表明存在其他未鉴定的抑制剂。然而，在一个连续的实验室规模的沼气反应器实验中，稳定的共消化牛粪与20%PAP麦秸被证明，而没有迹象表明对厌氧消化过程中的不利影响进行了观察。在将预处理的小麦秸秆引入反应器后，挥发性脂肪酸浓度保持低且稳定，而气体产量增加。在共消化中，PAP小麦秸秆以343 mL CH 4/gVS的平均产率转化。
Plasma-assisted pretreatment (PAP) of lignocellulosic biomass has been shown to be an efficient method to decompose lignin and consequently facilitate microbial access to cellulose and hemicellulose. In the present study, PAP was tested for its suitability to enhance bioconversion of wheat straw to methane. In thermophilic batch experiments, methane yields of up to 366 mL/g volatile solids (VSs) were achieved, accounting for a yield increase of 45%. Common lignin-derived inhibitors like 5-hydroxymethylfurfural (5-HMF) and furfural were not detected after PAP, but toxicity test resulted in lower methane yields at higher substrate concentrations, indicating the presence of other unidentified inhibitors. However, in a continuous lab-scale biogas reactor experiment, stable codigestion of cattle manure with 20% PAP wheat straw was demonstrated, while no signs of adverse effects on the anaerobic digestion process were observed. After the introduction of the pretreated wheat straw to the reactor, volatile fatty acid concentrations remained low and stable, while gas production increased. In co-digestion, the PAP wheat straw was converted at an average yield of 343 mL CH4/gVS.