Cold flow properties are the primary drawback to the common usage of biodiesel as an alternative fuel to diesel. Biodiesel's cold flow behaviour is discovered for the main reasons of presence of precipitant or crystal initiate by minor components such as monoglycerides and steryl glycosides. The ASTM test for this precipitant is ‘The Standard Test Method for Determination of Fuel Filter Blocking Potential of Biodiesel (B100) Blend Stock by Cold Soak Filtration Test (CSFT)’. Therefore, in this study, the performance of commercial activated carbon, silica and beach sand as adsorbent is studied in improving the filterability of two different level of refined biodiesel. The adsorbents were used to treat the biodiesel by removing the impurities present in the biodiesel such as the monoglycerides and steryl glycosides compound from biodiesel using adsorption technique. The efficiency of the adsorbent is determined by performing the cold soak filtration test. Based on the cold soak filtration test, precipitate is not visible and the CSTF is within the 360 s limit for the both refined level of biodiesel. However, treatment of these biodiesel with commercial activated carbon, silica and beach sand resulted in further reduce in CSFT. Commercial activated carbon found to be the most effective adsorbent, followed by silica. This is because both adsorbents possessed high surface area of 657.0420 m²/g and 320.2724 m²/g respectively and high pore volume of 0.379097 cm³/g and 0.952320 cm³/g respectively which further enhance its potential as an excellent adsorbent to improve the filterability of biodiesel compared to beach sand which possessed lowest surface area and lowest pore volume of only 1.2630 m²/g and 0.001751 cm³/g respectively.

冷流特性是生物柴油作为柴油替代燃料的主要缺点。发现生物柴油的冷流行为的主要原因是通过微量成分（例如甘油一酸酯和甾醇糖苷）存在沉淀或晶体引发。该沉淀剂的ASTM测试是“通过冷浸过滤测试（CSFT）测定生物柴油（B100）混合原料的燃油滤清器堵塞潜力的标准测试方法”。因此，在这项研究中，研究了商业活性炭，二氧化硅和海滩沙作为吸附剂的性能，以提高两种不同水平的精制生物柴油的过滤性。吸附剂用于通过使用吸附技术从生物柴油中去除生物柴油中存在的杂质（例如甘油单酯和甾基糖苷化合物）来处理生物柴油。通过进行冷浸过滤试验来确定吸附剂的效率。根据冷浸过滤测试，对于这两种精制水平的生物柴油，沉淀物均不可见，并且CSTF在360 s极限内。但是，用市售的活性炭，二氧化硅和海滩沙处理这些生物柴油会导致CSFT进一步降低。商业活性炭被发现是最有效的吸附剂，其次是二氧化硅。这是因为两种吸附剂都具有657.0420 m的高表面积 根据冷浸过滤测试，对于这两种精制水平的生物柴油，沉淀物均不可见，并且CSTF在360 s极限内。但是，用市售的活性炭，二氧化硅和海滩沙处理这些生物柴油会导致CSFT进一步降低。商业活性炭被发现是最有效的吸附剂，其次是二氧化硅。这是因为两种吸附剂都具有657.0420 m的高表面积 根据冷浸过滤测试，对于这两种精制水平的生物柴油，沉淀物均不可见，并且CSTF在360 s极限内。但是，用市售的活性炭，二氧化硅和海滩沙处理这些生物柴油会导致CSFT进一步降低。商业活性炭被发现是最有效的吸附剂，其次是二氧化硅。这是因为两种吸附剂都具有657.0420 m的高表面积² / g和320.2724 m ² / g以及分别为0.379097 cm ³ / g和0.952320 cm ³ / g的高孔体积，与表面最低的沙滩砂相比，进一步提高了其作为改善生物柴油可过滤性的优异吸附剂的潜力。面积和最低孔体积分别仅为1.2630 m ² / g和0.001751 cm ³ / g。