Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment

S. Heiske, Nadja Schultz-Jensen, Nadja Schultz-Jensen, F. Leipold, J. Schmidt
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引用次数: 34

Abstract

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.
血浆辅助预处理改善小麦秸秆厌氧消化
等离子体辅助预处理(PAP)木质纤维素生物质已被证明是一种有效的方法来分解木质素,从而促进微生物获得纤维素和半纤维素。在本研究中,试验了PAP对促进麦秸转化为甲烷的适宜性。在嗜热间歇实验中,甲烷产率达到366 mL/g挥发性固体(VSs),产率提高了45%。PAP未检测到常见的木质素衍生抑制剂,如5-羟甲基糠醛(5-HMF)和糠醛,但毒性试验结果表明,在较高的底物浓度下,甲烷产率较低,表明存在其他未知的抑制剂。然而,在连续的实验室规模的沼气反应器实验中,牛粪与20% PAP麦秸稳定共消化,而没有观察到对厌氧消化过程产生不利影响的迹象。将预处理过的麦秸引入反应器后,挥发性脂肪酸浓度保持较低且稳定,产气量增加。在共消化过程中,PAP麦秸的平均CH4产量为343 mL /gVS。
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