In view of the problems that the mass concentration of oily substances of bio-chemical influent in sewage treatment plant exceeds the design index and affects stable opera-tion,the process is sorted out and the water quality is analyzed,and the main reasons leading to the excessive mass concentration of oil are found out.Ultrasonic and chemical demulsification tests are carried out to develop an efficient oil removal process basing on the comprehensive wastewater of oil refining.The results show that the combined process of"ultrasonic+oil iso-lation+two-stage air flotation"is used to pretreat the comprehensive wastewater of oil refi-ning under the conditions of ultrasonic frequency of 60 kHz,power of 80～100 W,reaction time of 30 min,temperature of 35 ℃,flocculants composing of 200 mg/L ZQ and 2～3 mg/L polyac-rylamide(PAM),mass concentration of the oil in biochemical influent is less than 20 mg/L,and the operation cost is equialent to the current"tank in tank oil separation+three-stage flotation"process,which can create good conditions for the stable operation of biochemical sys-tem and sewage reuse.
refinery sewageultrasonic wavedemulsification and oil removalflocculant
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NSTL
万方数据
