摘要
对不同种气液接触方式的臭氧气液传质性能进行了研究,考察了磁场作用下的臭氧进气量,液面高度以及液相p H值对微气泡臭氧传质效果的影响规律。实验研究表明,相同实验条件下,采用微气泡附加磁场(磁铁相吸)比底部曝气盘和微气泡发生器接触方式,液相中溶解的臭氧浓度分别提高了72.6%和11.4%,经过30 min后,水中溶解的臭氧浓度为8.91 mg/L,传质系数为0.2272 min-1,传质系数显著提高;在磁场的作用下的微气泡臭氧接触方式,臭氧气体流量较小的情况下,臭氧在液相溶解效率较高,液面高度h越高溶解的臭氧浓度越低,传质系数kLa值随着气液流量的增加而增加,但是随着液面高度h的增加而降低,液相的p H值也影响着传质效果,p H越低,水中溶解的臭氧浓度越高,传质系数越高。
Ozone gas-liquid mass transfer properties were studied for different types of gas-liquid contact modes. The influence rules were investigated on the ozone flow rate,the height of the liquid level and the p H of the liquid phase influencing the ozone mass transfer efficiency with the micro-bubble contact mode under the action of magnetic field. The experimental studies showed that the ozone mass transfer mode with the micro-bubble contact mode under the action of magnetic field( the magnet attraction mode) compared the contact mode of the aeration at the bottom and the micro-bubble,got the ozone concentration in liquid phase increased by 72. 6%and 11. 4% respectively under the same experimental conditions,and after 30 min the ozone concentration was8. 91 mg / L,and the mass transfer coefficient was 0. 2272 min-1. Through the ozone mass transfer mode with the micro-bubble contact mode under the action of magnetic field( the magnet attraction mode),the ozone flow rate lower ozone dissolving efficiency in the liquid phase was higher,and the liquid level height h higher the dissolved ozone concentration was lower,and the mass transfer coefficient kLa increased with the increase of ozone flow rate and reduced with the increase of the liquid level height h,and the liquid phase p H also influenced the mass transfer efficiency,so the lower p H the higher the concentration of dissolved ozone in the liquid phase,and also the higher the mass transfer coefficient.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第3期1264-1268,共5页
Chinese Journal of Environmental Engineering
基金
国际科技合作计划项目(BZ2012065)
江苏省博士后基金(1301064C)
关键词
磁场
臭氧
微气泡
传质系数
magnetic field
ozone
micro bubble
mass transfer coefficient
