改性硅藻土在去除微污染水体中藻毒素的应用研究

Application of Modified Diatomite in Removing Algal Toxins from Slightly Polluted Water

自然水体藻类生长旺盛,水中藻毒素影响饮用水源地的供水安全。选择改性硅藻土作为吸附材料,研究其在现有净水工艺基础上,对自然微污染河湖水中藻毒素(MC-LR)的去除影响。结果表明,改性硅藻土对水中藻毒素去除效果显著,1 h内可将水中藻毒素质量浓度降至1.0μg/L以下,不同季节去除率相差较明显,秋季去除率高达70%以上,水体中藻密度也有大幅度下降。硅藻土是天然水体中硅藻类残骸沉积作用的一种非金属矿物,其化学成分可在水中反应形成絮体,经理化方法,完成水体净化,终产物以污泥形态移出水体,整个反应过程,无任何有害化学物质产生或残留,对水体不产生二次污染。

Algal toxin pollution caused by algal blooms seriously threatens the water supply safety of lake-reservoir drinking water source.The removal of algal toxin(Mc-lr)in natural slightly polluted river and lake water by modified diatomite was studied.The results showed that the surface of modified diatomite was porous and the surface morphology was significantly different before and after the reaction,which may be because a large number of pollutant monomers were adsorbed on the surface of diatomite after the reaction,leading to the occupation of surface.Adding modified diatomite into the water containing algal toxin can reduce the algal toxin concentration to less than 1.0μg/L within 1 hour,and has a good removal effect on algal toxin.In autumn,the removal rate is as high as 70%,and the density of algae in water also decreases greatly.Diatomite is processed from naturally formed diatom ore.After the floc is formed in the water,the water body is purified through flocculation,precipitation,physical adsorption and other actions,and the sludge is finally removed from the water body.There are no toxic and harmful residues in the whole process of treatment,and no secondary pollution to the water body.