评价脂肪、油和油脂（FOG）沉积物中的物理和化学性质及其相互作用。
Evaluation of physical and chemical properties and their interactions in fat, oil, and grease (FOG) deposits.
机构信息
Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, 2312 Food Science Building, USA.
Department of Food Sciences, Purdue University, West Lafayette, IN, 745 Agriculture Mall Drive, USA.
出版信息
Water Res. 2017 Oct 15;123:173-182. doi: 10.1016/j.watres.2017.06.072. Epub 2017 Jun 26.
Fat, oil and grease (FOG) blockages in sewer systems are a substantial problem in the United States. It has been estimated that over 50% of sewer overflows are a result of FOG blockages. In this work, a thorough laboratory study was undertaken to examine key variables that contribute to FOG deposit formation under controlled conditions. Physical and chemical properties and their interactions were evaluated and conditions that generated deposits that mimicked field FOG deposits were identified. It was found that 96 of the of 128 reaction conditions tested in the laboratory formed FOG deposits with similar physical and chemical characteristics as field FOG deposits. It was also found that FOG deposits can be created through fatty acid crystallization and not just saponification. Furthermore FOG deposits were found to be more complex than previously documented and contain free fatty acids, fatty acid metal salts, triacylglycerol's, diacylglycerol's and, monoacylglycerol's. Lastly it was found that FOG deposits that only contained saturated fatty acids were on average 2.1 times higher yield strength than deposits that contained unsaturated fatty acids.
在美国，下水道系统中的脂肪、油和油脂（FOG）堵塞是一个严重的问题。据估计，超过 50%的下水道溢出是 FOG 堵塞造成的。在这项工作中，进行了一项彻底的实验室研究，以检查在控制条件下导致 FOG 沉积物形成的关键变量。评估了物理和化学性质及其相互作用，并确定了生成类似于现场 FOG 沉积物的沉积物的条件。结果发现，在实验室中测试的 128 种反应条件中有 96 种形成了 FOG 沉积物，其物理和化学特性与现场 FOG 沉积物相似。还发现，FOG 沉积物不仅可以通过脂肪酸结晶形成，还可以通过皂化形成。此外，发现 FOG 沉积物比以前记录的要复杂得多，包含游离脂肪酸、脂肪酸金属盐、三酰基甘油、二酰基甘油和单酰基甘油。最后，结果发现，仅含有饱和脂肪酸的 FOG 沉积物的屈服强度平均比含有不饱和脂肪酸的沉积物高 2.1 倍。
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