Water treatment method for adsorbing and removing Tl<+> and/or Cd2<+> by producing nanometer manganese dioxide in situ

Abstract

The invention discloses a water treatment method for adsorbing and removing Tl<+> and / or Cd2<+> by producing nanometer manganese dioxide in situ, relating to a water treatment method of thallium and / or cadmium-containing source water and solving the problems of complex process, high running cost and low removing efficiency of thallium and / or cadmium existing in the conventional water treatment technology specific to thallium and / or cadmium-polluted source water. The method comprises the following steps of: adding permanganate and sodium thiosulfate into Tl<+> and / or Cd2<+>-containing water; stirring to obtain a mixed solution; adding a coagulant; and performing conventional water treatment. Nanometer manganese dioxide which has a large specific surface area and high electronegativity and is easy for precipitation separation is produced in situ by making permanganate react with sodium thiosulfate, so that low-concentration Tl<+> and / or Cd2<+> in water can be removed effectively and specifications in the national Sanitary Standard for Drinking Water are met. The method has the advantages of high removing efficiency, simple process, flexibility and convenience for operation, no change of the original treatment process of a water plant, low running cost and the like, and can be applied to emergency treatment of a water pollution event.

Description

technical field [0001] The invention relates to a water treatment method for source water containing thallium and / or cadmium, in particular to the use of nano-manganese dioxide produced in situ to absorb and remove Tl + and / or Cd 2+ water treatment methods. Background technique [0002] Thallium is a highly dispersed rare metal element widely used in industries such as chemical industry, electronics, medicine, aerospace, high-energy physics and superconducting materials. At the same time, thallium is an element with strong physiological toxicity. Due to the continuous development and utilization of thallium-containing resources, the ways for thallium to enter the water environment are expanding. Therefore, thallium has become one of the highly toxic heavy metal elements that has attracted more attention in the field of water treatment research. Thallium mainly exists in the positive monovalent form in nature, and its toxicity is greater than that of arsenic. It can enter ...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of in-situ generation nano-manganese dioxide adsorption removal Tl + and / or Cd 2+ The water treatment method solves the problems of complex process, high operating cost and low removal efficiency of thallium and / or cadmium in the existing water treatment technology for source water polluted by thallium and / or cadmium, and realizes the realization of thallium and / or cadmium Effective removal of thallium and cadmium below 0.1 μg / L and cadmium below 5 μg / L in the “Drinking Water Hygienic Standard”

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