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首页> 外文期刊>Chemosphere >Biodiesel from dewatered wastewater sludge: A two-step process for a more advantageous production
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Biodiesel from dewatered wastewater sludge: A two-step process for a more advantageous production

机译：脱水废水污泥中的生物柴油：两步过程，可提高生产效率

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摘要

Alternative approaches for obtaining biodiesel from municipal sludge have been successfully investigated. In order to avoid the expensive conventional preliminary step of sludge drying, dewatered sludge (TSS: 15 wt%) was used as starting material. The best performance in terms of yield of fatty acid methyl esters (18 wt%) with the lowest energy demand (17 MJ kg_(FAME)~(-1)) was obtained by a new two-step approach based on hexane extraction carried out directly on dewatered acidified (H_2SO_4) sludge followed by meth-anolysis of extracted lipids. It was found that sulphuric acid plays a key role in the whole process not only for the transesterification of glycerides but also for the production of new free fatty acids from soaps and their esterification with methanol. In addition to biodiesel production, the investigated process allows valorization of primary sludge as it turns it into a valuable source of chemicals, namely sterols (2.5 wt%), aliphatic alcohols (0.8 wt%) and waxes (2.3 wt%).
机译：已经成功地研究了从城市污泥获得生物柴油的替代方法。为了避免污泥干燥的昂贵的常规预备步骤，将脱水的污泥（TSS：15wt％）用作起始材料。通过基于己烷萃取的新的两步法，获得了最低能量需求（17 MJ kg_（FAME）〜（-1））的最佳脂肪酸甲酯收率（18 wt％）。直接在脱水的酸化（H_2SO_4）污泥上处理，然后对提取的脂质进行甲基分析。已发现硫酸不仅在甘油酯的酯交换反应中而且在肥皂的生产新的游离脂肪酸及其与甲醇的酯化反应中都起着关键作用。除了生产生物柴油外，研究过的工艺还可以对初级污泥进行增值处理，因为它可以将其转化为有价值的化学物质，即固醇（2.5 wt％），脂族醇（0.8 wt％）和蜡（2.3 wt％）。

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