硅藻土过滤(DEF)技术的研究

STUDY ON THE TECHNOLOGY OF DIATOMITE FILTRATION

通过中试试验研究，获得了硅藻土能滤除粒径为５０ｎｍ以上颗粒杂质，对细菌滤除率＞９９．５％、病毒滤除率＞８５％的良好结果；得出了硅藻土涂膜过滤机理主要是机械筛滤作用和吸附截留作用的结论。同时指出：硅藻土过滤滤速宜控制在１～２．５ｍ３／ｈ的范围，在原水中投加０．５ｍｇ／Ｌ左右的高价电解质降低颗粒表面ξ电位，可提高工作周期、提高滤除率。同时对硅藻土过滤过程、成膜性质。

In pilot study on diatomaceous earth filter, it has concluded that, diatomite filter can intercept dia≥50nm particles, remove above 99. 5% bacteria and 85% virus, mechanism of diatomaceous earth filtration is the function of mechanical screening and surface adsorption. It also suggests that filtering velocity should be 1-2.5m /hr. in diatomite filtration, adding polyelectrolyte of about 0. 5mg/L into raw water can reduce potential of particle surface, thence enhance filtration cycle and filtration efficiency.In this paper, the filtration progress and characteristies and process of film formation are also analysed.