钼污染饮用水的PAC吸附工艺

Study on Molybdenum Treatment by Powdered Activated Carbon

目的研究粉末活性炭对生活饮用水中钼污染物的去除效果，通过试验确定最适宜的PAC种类、投加量、吸附时间、pH等工艺参数，为饮用水中钼污染物的去除提供依据．方法以自配的钼质量浓度为1mg／L溶液为原水，模拟钼污染的饮用水，通过试验验证粉末活性炭吸附对钼污染物的去除效果．结果粉末活性炭对钼污染物的吸附在40min内能达到吸附容量的80％～90％；粉末活性炭对钼污染物的吸附等温线符合弗兰德里希（Freundlich）吸附模式，在钼的平衡质量浓度为0．07mg／L时，粉末活性炭对其吸附容量大约为12mg／g．结论比表面积大的木质粉末活性炭适合对钼污染饮用水的处理，溶液的最佳pH值范围为5—8．

The purpose of this paper is to study the effect of the powdered activated carbon （PAC） on the removal of molybdenum coagulation in raw water in order to provide the basis for molybdenum coagulation. With self-compound water for raw water, imitating abrupt molybdenum water pollution （ 1 mg/L）, a full- scale study was carried out through the laboratory by adding the PAC to make sure the best process parameters,including the best category of PAC,the suitable dosage of adding,the adsorption time of PAC, pH and so on. The result indicates that the powdered activated carbon can adsorb its capacity＇s 80% -90% in 40mins quickly;its absorption isotherm on molybdenum matches with the Freundlich adsorption mode. The absorption capacity of molybdenum by powdered activated carbon is about 12 mg/g, when the equilibrium concentration of aniline is at 0. 07 mg/L. According to the result, the powered activated carbon with high specific surface area has optimum efficiency;the pH of the aqua which is from 5 to 8 is the best choice.