Abstract:

The use of ultrasound in circulating cooling water sterilization is effective，moreover a long-term effect of bacteriostasis function exists. Several factors，including ultrasonic frequency and intensity，acoustic form which affect the treating result of cooling water were investigated. The optimum condition of sterilization：ultrasonic mixing frequency of 28/40kHz，ultrasonic intensity of 0.30W/cm²，sterilization time of 60min was obtained through orthogonal test. Under this condition 1000 mL circulating water was treated and the bactericidal rate was up to 94.6%. Bacteriostasis test showed that bacteriostasis rate was 82.1% after 72 h. Ultrasonic cavitation could influence the absorbance of KI solution，so the relationship between ultrasonic frequency，intensity with ultrasonic cavitation was obtained. Ultrasonic cavitation was one of the important reasons for ultrasonic sterilization by exploring the mechanism of ultrasonic sterilization. Ultrasound used for sterilization of circulation cooling water will be a new environment-friendly method for purification of industrial circulating cooling water .

摘要：

将超声用于石油化工循环冷却水中异养菌的灭菌处理，详细系统地考察了各个影响因素：超声频率、声强、声场形式对冷却水净化处理的影响规律。通过正交实验得出，在超声声强为0.30 W/cm²下，采用28/40 kHz混频超声处理1000 mL循环冷却水，处理时间为60 min时灭菌率达到94.6%。抑菌实验表明，经过72 h后抑菌率仍为82.1%。结果说明了超声灭菌不仅能起到较好的灭菌效果，还有长久抑菌的作用。同时，利用超声处理KI溶液后的吸光度变化表示超声频率、声强与超声空化强度的关系，以此探索了超声灭菌的机理，认为超声空化作用是超声灭菌的一个重要原因，将超声用于循环冷却水灭菌过程将成为绿色环保的工业循环冷却水净化新方法。