超声用于循环冷却水灭菌.pdf

学免兔ww.xicti1t11.com
进展
2011年第30卷第7期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
1431
研究开发
超声用于循环冷却水灭菌
张帆,吕效平,韩萍芳,蓁振宝
(南京工业大学化学化工学院超声化学工程研究所,江苏南京210000
摘要:将超声用于石油化工循环冷却水中异养菌的灭茵处理,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0.30Wcm2下,采用28/40kHz
混频超声处理1000mL循环冷却水,处理时间为60min时灭茵率达到94.6%。抑菌实验表明,经过72h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。
关键词:超声;灭菌;空化;循环冷却水
中图分类号:TQ085.4
文献标志码:A
文章编号:1000-6613(2011)07-1431-05
Sterilization of circulating cooling water by ultrasound
ZHANG Fan, LU Xiaoping, HAN Pingfang, QIN Zhenbao
(Institute of Sonochemical Engineering, School of Chemistry and Chemical Technology, Nanjing University c
Technology, Nanjing 210009, Jiangsu, China)
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 mixin frequency of 28/40KHZ, ultrasonic intensity o
0. 30W/cm", 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
howed 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
Key words: ultrasound; sterilization; cavitation; circulating cooling water
在许多过程エ业(石油、化工、电厂、治金、加杀菌剂。一般将杀菌剂分为氧化型和非氧化型
核能等)均需使用大量的工业循环冷却水,但在杀菌剂两类?。氧化性杀菌剂会对其它水处理药
循环水中极易生长微生物(菌、藻、虫等)并能
附着在管道、换热器等有关设备内腐蚀、堵塞设
收稿日期:2010-12-02:修改稿日期:201-01-14
备,降低传热效率,増加操作费用及设备费用。
第一作者:张帆(1986-),女,硕十研究生,研究方向为水污染治
理。联系人:吕效平,教授,博士生导师,主要从事超声在石油化工
目前循环冷却水杀生的基本方法就是通过定期添化工环保及水处理的应用等研究,E-mailxpl@njut.edu.cn