State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China.
Bioresour Technol. 2012 Nov;124:227-32. doi: 10.1016/j.biortech.2012.07.063. Epub 2012 Jul 25.
In this study, biosurfactant-producing strain N2 and non-biosurfactant producing stain KB18 were used to investigate the effects of microbial treatment on the prevention and removal of paraffin deposits on stainless steel surfaces. Strain N2, with a biosurfactant production capacity, reduced the contact angle of stainless steel to 40.04°, and the corresponding adhesion work of aqueous phase was decreased by 26.5 mJ/m(2). By contrast, KB18 could only reduce the contact angle to 50.83°, with a corresponding 7.6 mJ/m(2) decrease in the aqueous phase work adhesion. The paraffin removal test showed that the paraffin removal efficiencies of strain N2 and KB18 were 79.0% and 61.2%, respectively. Interestingly, the N2 cells could attach on the surface of the oil droplets to inhibit droplets coalescence. These results indicate that biosurfactant-producing strains can alter the wettability of stainless steel and thus eliminate paraffin deposition.
在这项研究中，使用产生物表面活性剂的菌株 N2 和不产生物表面活性剂的菌株 KB18 来研究微生物处理对防止和去除不锈钢表面石蜡沉积物的影响。具有生物表面活性剂生产能力的菌株 N2 将不锈钢的接触角降低到 40.04°，相应的水相附着功降低了 26.5 mJ/m(2)。相比之下，KB18 只能将接触角降低到 50.83°，相应的水相附着功降低了 7.6 mJ/m(2)。石蜡去除测试表明，菌株 N2 和 KB18 的石蜡去除效率分别为 79.0%和 61.2%。有趣的是，N2 细胞可以附着在油滴表面上，从而抑制液滴聚结。这些结果表明，产生物表面活性剂的菌株可以改变不锈钢的润湿性，从而消除石蜡沉积。
