CAJ | 학술논문

针对我国水源水中微量重金属污染特点，在不改变常规给水处理工艺前提下，提出了用水合二氧化锰去除饮用水中的微量重金属镉污染物的强化混凝工艺。采用硫代硫酸盐与高锰酸盐经氧化还原反应生成的水合二氧化锰处理含镉水源水，系统讨论了pH、浊度、腐殖酸等水质参数对水合氧化锰混凝除镉效能的影响；采用XRD、XPS技术并结合投射电镜技术对水合二氧化锰粒子的物相晶型、表面组成及水中形态进行了表征；采用透光脉动检测技术对水合二氧化锰絮凝的全过程进行了研究，把微观的絮体结构与形态观测同宏观的混凝现象结合起来进行综合分析，试图探讨水合二氧化锰混凝去除水中重金属镉的可能机理和特点。结果表明：水合二氧化锰为表面积大、吸附力强的非晶形胶体，对溶解态隔和吸附态镉均表现了优异去除能力，其去除金属镉的机理可能是依靠专属吸附、静电吸附以及网捕卷扫综合作用的结果。水合二氧化锰能够很有效去除水源水中的微量镉，并能使出水满足饮用水水质标准。
침대아국수원수중미량중금속오염특점，재불개변상규급수처리공예전제하，제출료용수합이양화맹거제음용수중적미량중금속력오염물적강화혼응공예。채용류대류산염여고맹산염경양화환원반응생성적수합이양화맹처리함력수원수，계통토론료pH、탁도、부식산등수질삼수대수합양화맹혼응제력효능적영향；채용XRD、XPS기술병결합투사전경기술대수합이양화맹입자적물상정형、표면조성급수중형태진행료표정；채용투광맥동검측기술대수합이양화맹서응적전과정진행료연구，파미관적서체결구여형태관측동굉관적혼응현상결합기래진행종합분석，시도탐토수합이양화맹혼응거제수중중금속력적가능궤리화특점。결과표명：수합이양화맹위표면적대、흡부력강적비정형효체，대용해태격화흡부태력균표현료우이거제능력，기거제금속력적궤리가능시의고전속흡부、정전흡부이급망포권소종합작용적결과。수합이양화맹능구흔유효거제수원수중적미량력，병능사출수만족음용수수질표준。
Source water in China contains in general pollutants of trace heavy metals. In this paper it is suggested that use of hydrous manganese dioxide enhance removal of cadmium in source water without changing the conventional treatment technique. Hydrous manganese dioxide prepared with thiosulfate and potassium permanganate by oxidation-reduction reaction was used as a new type of purifying agent. The parameters such as pH,turbidity and humic acid, which affect its purifying efficiency, were also studied. The properties of new purifying agent, such as morphology, surface composition and structure are characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM) to establish links between them and coagulation phenomenon, and the characteristics of flocculation process are monitored by transmitted light fluctuation technique in order to reveal possible mechanism of cadmium removal by hydrous manganese dioxide. The results show that hydrous manganese dioxide is a kind of colloid with large specific surface, which exhibits strong adsorption characteristic thus excellent removal efficiency for dissolved and adsorbed cadmium. The mechanism of cadmium removal by hydrous manganese dioxide is probably that it is a combination result of specific adsorption, electrostatic-adsorption and entrapping-settling. So, it should be concluded that hydrous manganese dioxide can remove cadmium ions effectively from source water and can make effluent meet the national criteria for drinking water.