Development of a Test Procedure for Determining the Effect of Cleansing-Agents onBilge Water Purification

摘要

A method has been developed for the testing of the effect of the use of acleansing-agent on the oily-water separation of bilge water. The test-procedure is based on information obtained from ship's mechanics, producers of cleansing-agents, a builder of oily-water separators and on various methods to test oily-water separation for land based operations. The following test-principles have been adopted: A continuous flow system is used, which comprises the following components: a vessel of about 20 1 equipped with a stirrer; a peristaltic feed pump; an oily-water separator of the coalescent type; a peristaltic pump for continuous sampling; a pump for removal of excess oil from the inlet compartment of the oily water separator. Artificial bilge water is used containing lubricating oil, gas oil, grease and the test compound. After mixing and under continued stirring it is pumped to the separator at such a rate that an average residence time of 5 minutes is obtained. Samples are taken from the effluent of the separator and the oil content thereof is determined. The test duration is 20 minutes. The test results are compared with those of blank experiments. The test is carried out in triplicate. The following pass levels are proposed: a residual oil level of 10 mg per liter for the blank; a residual oil level of 15 mg per liter for the test product. Visible behavior and the analytical results as compared to the pass levels were in good agreement.