臭氧气泡大小对分散染料废水氧化处理效果的影响

Influences of ozone bubble size on the treatment of disperse dyestuff wastewater

采用臭氧氧化法处理实际分散染料废水,研究了初始pH、臭氧投加量、反应时间、臭氧气泡大小(气体洗瓶和自制的砂芯鼓泡反应柱分别作反应器)对处理效果的影响,采用动态显微高速摄影仪对反应器内的臭氧气泡进行了表征。结果表明,反应体系的初始pH、臭氧投加量越高,反应速率越快,染料废水的脱色及矿化效果越好;染料废水的臭氧氧化处理过程符合拟二级动力学方程;自制的砂芯鼓泡反应柱改善了臭氧分散效果,缩小了气泡直径,提高了臭氧传质速率和效率,强化了臭氧氧化能力。

The degradation of industrial disperse dyestuff wastewater was investigated using ozonation. The effect of initial solution pH, ozone dose, reaction time and size of ozone bubbles （a gas washing bottle and a self-made porous sintered glass sparger column were respectively served as ozonation reactor） on the degradation was studied. The high-speed microscopic camera was applied to characterize ozone bubbles in two reactors. It was found that the decolorization and mineralization of wastewater and the reaction rate increased as the initial pH value and ozone dose increased. The ozonation of wastewater was correctly modelled by a pseudo second-order kinetic model. Compared with the gas washing bottle, the self-made porous sintered glass sparger column significantly reduced bubble size, in- creased the mass transfer rate of ozone and enhanced the ozone oxidation of wastewater.