【摘要】 消毒是城市污水回用的必要环节。本文以某污水厂出水为研究对象 ,采用臭氧 (O3 )作为消毒剂 ,考查了臭氧在实验水中的溶解和衰减过程 ,不同通气量和不同pH值条件下臭氧对城市污水厂生化处理后出水中大肠菌群的消毒过程和消毒效果。实验结果显示 ,臭氧对水中大肠菌群的消毒速度快、消毒效果十分显著 ;通入水中的气量低于 1 0l/h时 ,灭菌率随通气量的提高而提高 ;在水质偏酸性时 ,有利于臭氧的溶解和提高大肠菌群的去除率 ;通气量在 5l/h～ 30l/h,处理时间在 1 0min以内时实验条件下臭氧消毒宏观动力学方程为 -logS =Kt,式中K =0 2 385min-1 ～ 0 4674min-1 .更多还原

【Abstract】 Disinfection is a key factor for the reuse of wastewater. In this pap er, the secondary effluent of municipal wastewater was disinfected by ozone (O 3). The experiment results showed that the quantity of supplied gas with oxygen and ozone affected the disinfection rates obviously when the quantity of supplie d gas was less than 10l/h. Better results were got while more gas was supplied. The value of pH was important for the dissolution and decomposition of ozone wh ich affected the disinfection rates notably. The lower the pH was, the higher the disinfection rates were. Under these conditions of Q=5l/h～30l/h and t≤10mi n, the kinetic equation of the disinfection process was got:-logS=Kt, and the constant K=0.2385min -1 ～0.4674min -1 .更多还原