污水深度处理微絮凝砂滤工艺对去除粪大肠菌的模拟及实验分析

Simulation and Experimental Analysis on Removal of Fecal Coliform by Micro-flocculation Sand and Filtration Process in Wastewater Treatment

微絮凝砂滤工艺由于其占地面积小、造价和运行费用低以及对污染物去除效果好而被广泛应用于污水的深度处理工艺.该研究通过模拟和试验分析对微絮凝砂滤工艺去除粪大肠杆菌进行探讨.从生物安全性和数学模型的角度出发,研究了微絮凝砂滤深度处理工艺对二级出水中粪大肠菌的去除效果并对其进行了简单模拟.结果表明:当二级出水中粪大肠菌数量级为6.1~6.44时,微絮凝砂滤工艺可以去除0.6~1.0个数量级的粪大肠菌,絮凝剂剂量对粪大肠杆菌的去除没有明显影响,但随着滤速的增大和滤层深度的减小均会降低其去除效果.根据一级反应动力学建立的模型可以很好的模拟微絮凝砂滤对粪大肠菌的去除效果.

Micro-flocculation and sand filtration has been widely used as advanced treatment process due to its small land and low investment and operation as well as high efficiency on pollutants removal. The micro- flocculation sand filtration process for the removal of fecal coliform was discussed through the simulation and experimental analysis. From the aspect of biological safety and mathematical model, micro-floeeulation and sand filtration on fecal coliform removal and modeling the removal of fecal coliform is studied. Micro-flocculation and sand filtration can remove 0.6 - 1.0 ordor of maghitudes fecal coliform when fecal coliform in water is 6.1 - 6.44. The flocculation dose has little effect on coliform removal and the increase of loading rate or the decrease of sand length will reduce the removal efficiency of fecal coliform. The model based on first-order kinetics can successfully model the removal of fecal coliform in micro-flocculation and sand filtration.