CTMAB-Bt吸附地下水中硝酸盐和六价铬影响因素

Influence Factors on the the Synchronous Adsorption of Nitrate and Hexavalent Chromium in Groundwater by CTMAB-Bt

目的探究影响有机改性膨润土同步吸附地下水中硝酸盐和六价铬的因素.方法利用有机改性膨润土吸附目标水样,通过单因素试验,分析膨润土的改性量、温度、pH值、原水质量浓度的变化对吸附效果的影响.结果试验得出最佳同步吸附条件:膨润土有机改性量为80%,温度为5℃,pH值为6.5,对硝酸盐和六价铬的去除率最高可分别达到73.86%和60.95%.随着水样初始质量浓度的增大,去除效果下降.结论有机改性膨润土吸附剂制备成本低廉,操作简单,可去除由于电镀、金属冶炼和农业生产等造成的同时含硝酸盐和六价铬的地下水污染.

Influence factors on the simultaneous adsorption of nitrate and hexavalent chromium in groundwater were investigated by organically modified bentonite.The effects of various single factors on the adsorption effect were investigated according to the amount of bentonite modified,reaction temperature,initial pH value of water sample and initial concentration of water sample.When the amount of bentonite modified is 80%,the temperature is 5℃,and the pH value is 6.5,the removal effect of nitrate and hexavalent chromium is the best,and the removal rates are respectively 73.86%and 60.95%.As the initial concentration of the water sample increases,the removal effect decreases.The modified bentonite adsorbent has low preparation cost and simple operation.It can remove groundwater polluted by nitrate and hexavalent chromium caused by electroplating,metal smelting and agricultural production.