O3/NaClO协同氧化－吸附处理雨水的试验研究

采用O_3/NaClO协同氧化_吸附法对校园屋面雨水处理进行了试验研究。考察了粉末活性炭投加量、吸附时间、搅拌速度以及初始pH对COD、氨氮、TP和浊度去除率的影响;并进行了吸附等温线及动力学模型拟合。试验结果表明:粉末活性炭的最佳投加量为50 mg/L,最佳吸附时间为60 min,最佳搅拌速度为200 r/min,最佳初始pH为7时COD,氨氮,TP和浊度的去除率分别达到了68.87%,81.90%,78.79%,78.50%。COD和氨氮的吸附等温线更符合Freundilch模型,TP吸附等温线更符合Langmuir模型,拟二级动力学模型能更好的描述粉末活性炭对雨水中COD,氨氮和TP的吸附过程,相关系数均接近于1。

Experimental Research On The Treatment of Rainwater By O3/NaClO Oxidation - Adsorption Process

In this paper, the O3/NaClO collaborative oxidation - adsorption process has been used for treating school roof rainwater.The effects of powered activated carbon dosage,adsorption time,stirring speed and pH value on the removal rate of COD,ammonia-nitrogen,TP and turbidity have been investigated.The experimental result shows that the optimal reaction conditions of powered activated carbon process are optimum powered activated carbon dosage 50mg/L,adsorption time 20min,stirring speed 200r/min and pH=7,with the removal efficiency of the rainwater COD,ammonia-nitrogen,TP and turbidity respectively reaching up to 68.87%,81.90%,78.79%,78.50% by O3/NaClO collaborative oxidation-adsorption process; The adsorption isotherm of COD and ammonia-nitrogen fits to Freundilch and TP fits to Langmuir isothermal adsorption model. The adsorption process of COD, ammonia-nitrogen and TP on activated carbon dosage can be best described by a pseudo-second order kinetic model and the correlation coefficient is close to 1.000 .