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首页> 外文期刊>Energy Conversion & Management >Municipal solid waste as a suitable substrate for butanol production as an advanced biofuel
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Municipal solid waste as a suitable substrate for butanol production as an advanced biofuel

机译：市政固体废物是丁醇生产中用作高级生物燃料的合适基质

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The biodegradable fraction of municipal solid waste (BMSW), dominantly composed of starchy and lignocellulosic materials, has high potential to be used for liquid biofuel production. Hot water or dilute acid treatment at high temperature was utilized for the solubilization or hydrolysis of the starch fraction and pretreatment of the lignocellulosic fraction. The treatment liquor, which was rich in sugars and starch, was evaluated for acetone, butanol, and ethanol (ABE) production by Clostridium acetobutylicum, and it was found that phenolic compounds, especially tannins, critically inhibited the butanol production. To improve ABE production, the extraction of phenolic compounds prior to hot water or dilute acid treatment was evaluated. Among the evaluated extractants, i.e., acetone, ethanol, butanol, and water, ethanol showed the highest amount of tannin extraction, resulting in an 87% reduction in tannin content. Dilute acid treatment of the ethanol extracted BMSW at 140 degrees C for 60 min resulted in a liquor containing 23 g/L glucose and 41 g/L soluble starch, which was fermented to the highest ABE concentration of 17 g/L with productivity of 0.24 g/L/h. The fermentation of liquor obtained by dilute acid treatment of butanol, acetone, and water-extracted BMSW was accompanied by 9, 6, and 4 g/L ABE production. Even by hot water treatment, the liquor obtained from ethanol extracted BMSW was fermented to the highest ABE concentration of 8 g/L. In addition to the liquor, the pretreated lignocellulosic material was subjected to enzymatic hydrolysis and ABE fermentation, leading to production of 5-6 g/L ABE. This process resulted in the production of 83.9 g butanol, 36.6 g acetone, and 20.8 g ethanol from each kg of BMSW. Moreover, the co-production of ethanol by ABE fermentation reduced concerns about organic extractor loss in the extraction process, which was inescapable in the tannin extraction process.
机译：城市固体废物（BMSW）的可生物降解部分主要由淀粉和木质纤维素材料组成，具有用于液体生物燃料生产的高潜力。将高温下的热水或稀酸处理用于淀粉级分的增溶或水解以及木质纤维素级分的预处理。通过丙酮丁醇梭菌评估了富含糖和淀粉的处理液的丙酮，丁醇和乙醇（ABE）的产生，发现酚类化合物（尤其是单宁酸）严重抑制了丁醇的产生。为了提高ABE的产量，对热水或稀酸处理之前酚类化合物的萃取进行了评估。在所评估的萃取剂（即丙酮，乙醇，丁醇和水）中，乙醇显示出最高的单宁提取率，单宁含量降低了87％。在140摄氏度下对乙醇萃取的BMSW进行稀酸处理60分钟，得到的酒中含有23 g / L葡萄糖和41 g / L可溶性淀粉，将其发酵至最高ABE浓度为17 g / L，生产率为0.24克/升/小时通过丁醇，丙酮和水萃取的BMSW的稀酸处理获得的酒的发酵伴随有9、6和4 g / L ABE的生产。甚至通过热水处理，将从乙醇萃取的BMSW中获得的液体发酵至最高ABE浓度为8 g / L。除液体外，对预处理的木质纤维素材料进行酶水解和ABE发酵，从而产生5-6 g / L ABE。此过程导致每千克BMSW产生83.9 g丁醇，36.6 g丙酮和20.8 g乙醇。此外，通过ABE发酵联产乙醇减少了对萃取过程中有机萃取器损失的担忧，而这在单宁酸萃取过程中是不可避免的。

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