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首页> 外文期刊>Journal of Petroleum & Environmental Biotechnology >In Situ Transesterification of Wet Activated Sludge under Subcritical Conditions
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In Situ Transesterification of Wet Activated Sludge under Subcritical Conditions

机译：亚临界条件下湿活化污泥的原位酯交换

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Commercial production of biodiesel uses refined vegetable as the feedstock with base as the catalyst. However, pure vegetable oil contributes up to 80% of the overall biodiesel production cost. Activated sludge is a rich source of lipid and a potential feedstock for biodiesel production. It was estimated that drying and oil extraction constitutes more than 50% of the cost of biodiesel production from wet activated sludge. In this study, wet activated sludge was directly used as the feedstock to react with methanol under subcritical water condition. At 250°C and a methanol to wet sludge ratio of 3.0 mL/g, a Fatty Acid Methyl Ester (FAME) yield of 33% can be achieved in 4 h. Acetic acid was employed as the catalyst to decrease the amount of methanol to 2.25 mL/g and reaction time to 1 h that were required to reach the same FAME yield (33%). This process can be applied to maximize biodiesel conversion of feedstock with high FFA and moisture contents.
机译：生物柴油的商业生产使用精制蔬菜作为原料，碱作为催化剂。但是，纯植物油占整个生物柴油生产成本的80％。活性污泥是脂质的丰富来源，也是生物柴油生产的潜在原料。据估计，干燥和榨油占湿法活性污泥生产生物柴油成本的50％以上。在这项研究中，湿活性污泥直接用作原料，在亚临界水条件下与甲醇反应。在250°C且甲醇与湿污泥的比率为3.0 mL / g的情况下，在4小时内可以实现33％的脂肪酸​​甲酯（FAME）收率。使用乙酸作为催化剂可将甲醇量降至2.25 mL / g，并将反应时间降至1 h，这是达到相同FAME收率（33％）所需的。此过程可用于最大化FFA和水分含量高的原料的生物柴油转化率。

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