天然河床渗滤水水质特征及净化机理研究

RESEARCH OF THE CHARACTERISTICS AND PURIFICATION MECHANISM OF SEEPAGE WATER

渗滤取水净水机理主要是利用砂砾石层表面的泥膜及砂砾石层本身过滤作用、吸附作用,微生物的降解作用达到去除水中的悬浮物质、降低水的浊度、除菌的效果。通过分析重庆江津白沙渗滤取水工程中渗透水水质表明,河水经过天然河床渗滤处理,其中的悬浮物质几乎可以被完全去除,并有较好的除菌效果。渗透水中NO3-,COD,BOD,TOC去除率达75%以上。渗透水常量化学组分Na+,Cl-浓度明显降低,Ca2+,Mg2+,HCO3有少量增加。渗滤水的水质得到大幅提高,不仅达到国家饮用水标准,而且由于水岩相互作用,使渗滤水矿化度也有所增加,产生一定矿化作用。

River water of slight pollution and high turbidity was converted into seepage water by filter through which the suspended substance was removed, turbidity was depressed and bacteria reduced.After the treatment,the NO_3^-,COD,BOD,TOC of water is removed dramatically along with the decrease of Na^+,Cl^- and increase of Ca^(2+),Mg^(2+),HCO_3^- in seepage water.As a result,the water quality met the nation′s standard.