水分对木质纤维素类底物厌氧消化预处理效率的影响。
Effect of moisture on pretreatment efficiency for anaerobic digestion of lignocellulosic substrates.
机构信息
Department of Chemical Engineering, University of Barcelona, C/Martí i Franquès, No. 1, 6th Floor, 08028 Barcelona, Spain; Centre for Solid Waste Bioprocessing, Schools of Civil and Chemical Engineering, The University of Queensland, St. Lucia Campus, 4072 QLD, Australia.
Department of Chemical Engineering, University of Barcelona, C/Martí i Franquès, No. 1, 6th Floor, 08028 Barcelona, Spain; Advanced Water Management Centre, The University of Queensland, St. Lucia Campus, 4072 QLD, Australia.
出版信息
Waste Manag. 2015 Dec;46:189-96. doi: 10.1016/j.wasman.2015.08.022. Epub 2015 Aug 24.
The present study evaluates the effect of moisture in low-temperature and ultrasound pretreatment on lignocellulosic substrates anaerobic biodegradability, where brewer's spent grain was used as model substrate. Besides moisture content, low-temperature pretreatment was also evaluated in terms of temperature (60-80°C) and exposure time (12-72 h). Likewise, ultrasonication was also evaluated in terms of specific energy (1000-50,000 kJ kg TS(-1)). In addition, the effect of substrate particle size reduction by milling pretreatment was also considered. The results clearly demonstrated that substrate moisture (total solid concentration) is a significant parameter for pretreatment performance, although it has been rarely considered in pretreatment optimisation. Specifically, moisture optimisation increased the methane yield of brewer's spent grain by 6% for low-temperature pretreatment (60°C), and by 14% for ultrasound pretreatment (1000 kJ kg TS(-1)) towards the control (without pretreatment). In both pretreatments, the experimental optimum total solid concentration was 100 gTS kg(-1). Thus, lowering substrate moisture, a strategy suggested attaining energetic pretreatment feasibility, needs to be analysed as another pretreatment variable since it might have limited correlation. Finally, a preliminary energetic balance of the pretreatments under study showed that the extra methane production could not cover the energetic pretreatment expenses.
本研究评估了低温和超声预处理中水分对木质纤维素基质厌氧生物降解性的影响，其中以啤酒糟为模型基质。除了水分含量外，还评估了低温预处理的温度（60-80°C）和暴露时间（12-72 小时）。同样，还评估了超声处理的特定能量（1000-50,000 kJ kg TS(-1))。此外，还考虑了通过研磨预处理减小基质粒径的效果。结果清楚地表明，尽管在预处理优化中很少考虑，但基质水分（总固体浓度）是预处理性能的重要参数。具体而言，水分优化使啤酒糟的甲烷产量在低温预处理（60°C）下提高了 6%，在超声预处理（1000 kJ kg TS(-1)) 下提高了 14%，而对照（未经预处理）则提高了 6%。在这两种预处理中，实验最佳总固体浓度为 100 gTS kg(-1)。因此，需要分析降低底物水分这一策略，因为它可能相关性有限，这是一种实现能量预处理可行性的建议策略。最后，对所研究的预处理进行了初步的能量平衡分析，结果表明，额外的甲烷产量无法覆盖能量预处理的费用。
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