Deep purification process for thallium-containing waste water

A treatment process and deep purification technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems that the concentration of thallium cannot meet the environmental quality standards of surface water, etc.

Inactive Publication Date: 2015-07-15
HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem solved by the present invention is that, under the higher thallium concentration, the existing purification treatment process cannot make the thallium concentration meet the requirements of the surface water environmental quality standard

Method used

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Examples

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Embodiment 1

[0026] Example 1 : In a non-ferrous metal smelter, the total thallium content in thallium-containing wastewater is 2500-3500mg / L, and the pH is 8.0-8.5. The technical scheme and processing method are as follows.

[0027] (1) Pump the thallium-containing wastewater into the reaction kettle, slowly add potassium permanganate solution with an oxidant mass concentration of 2%, and control the ORP between 470 and 485mV, that is, when the ORP is lower than 470mv, through the control system Control the opening of the potassium permanganate feeding valve, add potassium permanganate to the reactor, and close the feeding valve when the ORP reaches 485mv. When the ORP is stable above 470mv, continue to stir and react for 60min, at this time the total dosage of potassium permanganate is 300-350mg / L.

[0028] (2) While adding the oxidizing agent, add saturated milk of lime to adjust the pH to 9, and keep the pH value stable during the reaction, and control the addition of milk of lime du...

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PUM

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Abstract

The invention relates to a deep purification process for thallium-containing waste water, which belongs to the technical field of sewage treatment. The deep purification process for the thallium-containing waste water comprises the following steps: (1) adding excess oxidizing agent into the thallium-containing waste water so as to oxidize Tl<+> into Tl<3+>; (2) adjusting the pH value of the thallium-containing waste water to 7 to 13 so as to produce thallium hydroxide precipitate; (3) carrying out solid-liquid separation to remove the thallium hydroxide precipitate in the thallium-containing waste water so as to obtain preliminarily purified water; (4) adding a reducing agent into the preliminarily purified water so as to allow redox potential of the preliminarily purified water to be less than 200 mV; and (5) introducing the preliminarily purified water treated in the step (4) into an ion exchange column equipped with an adsorption resin for purification so as to obtain deeply purified water, wherein the adsorption resin is a macroporous chelate resin containing a mercapto group. The deep purification process enables the thallium-containing waste water to be deeply purified; and the obtained deeply-purified water has total thallium content of less than 0.1 [mu]g/L.

Description

technical field [0001] The invention relates to a deep purification treatment process for thallium-containing wastewater, which belongs to the technical field of sewage treatment. Background technique [0002] Thallium and its salts are a class of water pollutants with strong environmental hazards, and even low concentrations of thallium can have serious toxic effects on living organisms. The toxic effect of thallium on mammals far exceeds that of conventional heavy metals such as Hg, As, Cd, Pb, and Sb. Thallium enters the water environment mainly through the development of thallium-bearing mines, metal smelting, dust fall in thallium-bearing mineral areas, and waste discharge. Thallium can participate in the water cycle, enter the human body through the food chain or drinking water, and accumulate in bones, kidneys and other organs, causing symptoms such as hair loss, muscle atrophy, and damage to the central nervous system, which can be life-threatening in severe cases. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 贺前锋宋乐山言海燕阙雄杰赵迪刘豹
Owner HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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