Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei 10607, Taiwan.
Bioresour Technol. 2012 Nov;123:112-6. doi: 10.1016/j.biortech.2012.08.001. Epub 2012 Aug 10.
Wet activated sludge was converted directly into biodiesel using water as hydrolysis reagent to enhance the extraction of lipid in activated sludge, and as catalyst for the conversion of neutral lipids into biodiesel under subcritical conditions. At 175°C, 3.5MPa, a methanol to sludge ratio of 30 (mL/g) and a sludge water content of 84wt.%, about 90% conversion to fatty acid methyl esters was achieved within 24h without the need for conventional catalysts such as KOH and H(2)SO(4). Since water is employed as a catalyst, its removal is not required; therefore, the processing costs for producing biodiesel from activated sludge are reduced. The method has the potential for applications to other feedstock with high water contents such as micro-algae.
采用水作为水解试剂直接将湿活性污泥转化为生物柴油，以提高活性污泥中脂质的提取率，并在亚临界条件下将中性脂质转化为生物柴油的催化剂。在 175°C、3.5MPa、甲醇与污泥的比例为 30(mL/g)、污泥含水量为 84wt.%的条件下，无需使用 KOH 和 H(2)SO(4)等常规催化剂，在 24h 内可实现约 90%的脂肪酸甲酯转化率。由于使用水作为催化剂，因此无需去除，从而降低了从活性污泥生产生物柴油的加工成本。该方法有可能应用于其他含水量高的原料，如微藻。
