固废基陶粒对含磷废水的处理研究

Research on the Treatment of Phosphorus-Containing Wastewater by Ceramsite from Solid Wastes

在前期研究固废基陶粒的制备及性能表征的基础上,该文采用静态和动态试验方法,开展固废基陶粒处理模拟含磷废水研究。结果表明:在初始浓度为17 mg/L和反应温度为293 K时,固废基陶粒对水中磷的平衡吸附量可达1.013 mg/g,Freundlich吸附等温模型和准一级动力学方程都能较好地描述该吸附过程(R^(2)>0.95),且是一个自发的放热的物理吸附过程。在反应温度为293 K时,随着初始浓度由5 mg/L增至17 mg/L,基于固废基陶粒的固定床反应装置去除水中磷的穿透曲线变得越来越陡峭,穿透时间和饱和时间分别由34 h和60 h缩短至18 h和32 h,此外Yoon-Nelson固定床反应动力学方程能比较精确地描述动态除磷过程(R^(2)>0.95)。

On the basis of the preparation of ceramsite obtained from solid wastes by sintering process and its characterizations,adopting the batch and column studies,the treatment of simulated phosphorus-containing wastewater by solid wastesbased ceramsite is carried out.The experimental results showed that when initial concentration was 17 mg/L and reaction temperature was 293 K,the adsorption capacity of the ceramsite to phosphorus in water could reach 1.013 mg/g,the Freundlich isotherm model and pseudo-first order reaction kinetic can describe this adsorption processes very well respectively,with R^(2)>0.95.Under the condition of reaction temperature was 293 K,when the initial concentration was increased from 5 mg/L to 17 mg/L,the breakthrough curves of phosphorus removal from water by a fixed-bed column packed with the abovementioned ceramsite gradually became steep,and both breakthrough and saturation times decreased,from 34 h to 18 h and 60 h to 32 h,respectively.Furthermore,the Yoon-Nelson fixed-bed reaction kinetic model can be used to describe the dynamic phosphorus removal process,with R^(2)>0.95.