Schneider Lara Talita, Bonassa Gabriela, Alves Helton José, Meier Thompson Ricardo Weiser, Frigo Elisandro Pires, Teleken Joel Gustavo
a Department of Agricultural Energy , Western Paraná State University , Cascavel , Brazil.
b Federal University of Parana , Palotina , Brazil.
Environ Technol. 2019 Feb;40(5):594-604. doi: 10.1080/09593330.2017.1397772. Epub 2017 Nov 10.
Since industrial wastes are increasing, the development of studies to find ways for their use is urgent. Waste cooking oil is an important source for the production of biodiesel, one of the main biofuels in Brazil. However, during cooking, the oil undergoes conditions that change its properties and decrease its quality, such as its acidity value. Current research treats waste cooking oil by the adsorption process using rice husk, an agro-industrial waste, and activated carbon to compare results. The potential of the adsorbents to remove free fatty acids in waste cooking oil has been investigated by the batch technique, evaluating different operating conditions of temperature, adsorbent mass and agitation. Adsorbents were characterized by nitrogen physisorption, scanning electron microscope, energy-dispersive spectroscopy and X-ray diffraction. The maximum result obtained for activated carbon at acidity reduction was 63%, using 22.4°C, 169.64 rpm and 3.39 g of adsorbent mass. Already, using the rice husk the percentage of removal was the same, 63% using 22.4°C, 80.36 rpm and 1.61 g of adsorbent, however in shorter times. The results prove that the application of the rice husk for this purpose is advantageous, for being a low-cost material, available on a large scale and that provide results similar to activated carbon.
由于工业废物不断增加，开展相关研究以寻找其利用途径迫在眉睫。废弃食用油是生产生物柴油的重要原料，生物柴油是巴西主要的生物燃料之一。然而，在烹饪过程中，食用油会经历一些改变其性质并降低其品质的情况，比如其酸度值。目前的研究采用吸附法处理废弃食用油，使用农业工业废弃物稻壳和活性炭进行对比实验。通过间歇技术研究了吸附剂去除废弃食用油中游离脂肪酸的潜力，评估了温度、吸附剂质量和搅拌等不同操作条件。通过氮气物理吸附、扫描电子显微镜、能量色散光谱和X射线衍射对吸附剂进行了表征。在22.4°C、169.64转/分钟和3.39克吸附剂质量的条件下，活性炭降低酸度的最大效果为63%。而使用稻壳时，在22.4°C、80.36转/分钟和1.61克吸附剂的条件下，去除率相同，也是63%，不过所需时间更短。结果证明，将稻壳用于此目的具有优势，因为它是一种低成本材料，可大规模获取，且能提供与活性炭相似的效果。
