About 15000t of oily scum with high water-containing can be produced per year by Yangtze P-etrochemical Refinery.Experiments of using ultrasound pre-processing to reduce water-con-taining,as well as reduce the volume of the oily scum have been made.Results give the optimum values of some factors influencing dehydration effect,such as frequency,intensity,lasting time of ultrasound,sedimentation time and temperature.Comparing with the original technology of adding flocculants into the scum,the ultra-sound met...
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