中文摘要：

为进一步拓展天然高分子絮凝剂壳聚糖（（CTS）的应用范围，以CTS、L-半胱氨酸（L-cys）等为原料，以含镉废水为处理对象，通过正交试验研究了巯基改性壳聚糖（MCC）的最佳制备条件，并研究了水体中常见的Mg^2＋、Fe^3＋、Al^3＋、F^-等4种共存离子对MCC除镉性能的影响．结果表明：在最佳制备条件下得到的MCC对废水中的镉有较好去除效果；Mg^2＋的存在对絮凝剂除镉有抑制作用；低浓度的Fe^3＋和Al^3＋对絮凝剂除镉有抑制作用，但浓度较高时起促进作用；F^-在一定程度上能抑制镉的去除．

英文摘要：

In order to extend the application range of natural polymer flocculant chitosan （CTS）, an optimum preparation conditions of a new type of flocculant -modified chitosan by L-cysteine （MCC） can be obtained to deal with waste water containing cadmium by an orthogonal experiment. And several coexisting ions which affect the removal rate of Cd^2＋ are also studied. It is shown that the removal rate of cadmium in waste water is well; presence of Mg^2＋ inhibits the flocculant addition to cadmium; lower concentration of Fe^3＋ and Al^3＋ inhibits the flocculation of Cd^2＋, but it can promote the removal rate of Cd^2＋ when concentration increases;and F- can inhibit the removal rate of Cd^3＋ to some extent.