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

A nano-iron-manganese and oxide technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of low removal efficiency of thallium and/or cadmium, high operating cost, Problems such as complex water treatment technology and process, to achieve the effect of high electronegativity, low operating cost, and easy precipitation and separation

Active Publication Date: 2011-08-10
HARBIN INST OF TECH
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  • Application Information

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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 iron manganese oxide to remove 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 ca...

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  • Water treatment method for removing Tl&lt;+&gt; and/or Cd2&lt;+&gt; by producing nanometer iron and manganese oxides in situ
  • Water treatment method for removing Tl&lt;+&gt; and/or Cd2&lt;+&gt; by producing nanometer iron and manganese oxides in situ

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specific Embodiment approach 1

[0013] Specific embodiment one: In this embodiment, a kind of in-situ generation of nanometer iron manganese oxide removes Tl + and / or Cd 2+ The water treatment method is realized by the following steps: one, to the Tl-containing + and / or Cd 2+ Add permanganate and ferrous salt in the water, and then stir and react at a speed of 280-320 rpm for 1-10 minutes to obtain a mixed solution, wherein the molar ratio of permanganate and ferrous salt added is 1: 2.5~4, the dosage of permanganate is 0.5~10mg / L, and the permanganate is potassium permanganate or sodium permanganate; 2. Dosing into the mixed solution obtained in step 1 coagulant, and then through coagulation, precipitation, and filtration of conventional water treatment processes in order to remove Tl in water + and / or Cd 2+ .

[0014] The Tl-containing + and / or Cd 2+ The water refers to the water containing Tl + and / or Cd 2+ source of drinking water. The choice of permanganate is based on not introducing other re...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment differs from Embodiment 1 in that the permanganate added in step 1 is potassium permanganate or sodium permanganate. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the ferrous salt in step one is one of ferrous sulfate, ferrous chloride and ferrous perchlorate or a combination of several of them . Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0019] In this embodiment, when the ferrous salt is a combination of several of them, they are mixed in any ratio.

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Abstract

The invention discloses a water treatment method for removing Tl<+> and/or Cd2<+> by producing nanometer iron and manganese oxides 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 ferrous salt into Tl<+> and/or Cd2<+>-containing water; stirring to obtain a mixed solution; adding a coagulant; and performing conventional water treatment. A nanometer ferric hydroxide-manganese dioxide oxide composite adsorbent 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 the ferrous salt, so that Tl<+> and/or Cd2<+> can be removed effectively andspecifications 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 water source water containing thallium and / or cadmium, in particular to the method of removing Tl by using nano-iron manganese oxide produced in situ + 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 c...

Claims

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Application Information

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IPC IPC(8): C02F101/20C02F9/04
Inventor 马军江进庞素艳皇甫小留李圭白陈忠林梁恒
Owner HARBIN INST OF TECH
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