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Method for treating heavy metal-containing acidic wastewater in nonferrous metal industry

A technology of acid wastewater and treatment method, which is applied in the direction of water/sewage multi-stage treatment, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., and can solve the problem of insufficient compactness of sediment, large amount of precipitated sludge, unfavorable disposal, etc. problems, achieve the effect of reducing the use of chemicals, the operation process is simple, and the investment is reduced

Inactive Publication Date: 2012-11-28
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

However, the chemical precipitation method also has its limitations, such as the large amount of medicine required and high cost; the precipitation particles formed by some heavy metals are small and difficult to precipitate; some types of precipitation (such as hydroxide precipitation) are not compact enough, Causes a large amount of sedimentation sludge, which is not conducive to disposal, etc.

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  • Method for treating heavy metal-containing acidic wastewater in nonferrous metal industry
  • Method for treating heavy metal-containing acidic wastewater in nonferrous metal industry

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Embodiment 1

[0034] Taking the pretreated acidic wastewater containing heavy metals from a nonferrous metal smelting enterprise as the research object, the concentration of nickel in the wastewater is 1.84mg / L, the concentration of copper is 3.09mg / L, the concentration of lead is 3.36mg / L, and the concentration of arsenic is 3.36mg / L. The concentration is 24.46mg / L, the concentration of cadmium is 0.46mg / L, the pH is 1.06, and the COD is 290mg / L.

[0035] Please combine figure 1 and figure 2 .

[0036] 1) Mix the acid wastewater in the acid wastewater storage tank 1 and the tailings mortar in the tailings mortar storage tank 2 at a volume ratio of 12:1 through a proportional pipe mixer 3 (DN50) for neutralization.

[0037] 2) The mixed solution of the neutralization reaction enters 1# reaction tank 4, and Na 2 S solution and mechanical stirring for vulcanization reaction; Na 2 The mass concentration of S is 5%, and the proportion with acidic wastewater is 0.3; there is no strict requi...

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Abstract

A method for treating heavy metal-containing acidic wastewater in nonferrous metal industry adopts a tailings mortar neutralization-vulcanization-coagulation combined process, wherein the major flow of the process comprises the following steps of: neutralizing and absorbing the heavy metal-containing acidic wastewater by using tailings mortar at first, and then putting Na2S in a vulcanization reaction with left heavy metals in the acidic wastewater; next, performing coagulation and sedimentation with FeSO4 as a coagulant and polyacrylamide as a coagulant aid so that H+ in the acidic wastewater is neutralized, thereby removing heavy metals in the wastewater. The method reduces capital investment of an enterprise on wastewater disposal to an utmost extent, and simultaneously reduces the solid waste yield of the enterprise by utilizing the tailings mortar produced in mining and milling of ores; besides, the acidity of the wastewater can be effectively neutralized and the heavy metals can be effective removed.

Description

technical field [0001] The invention belongs to the field of water treatment in the field of environmental protection, and more specifically relates to a method for treating acid wastewater containing heavy metals in the nonferrous metal industry by using a combined process of neutralization-sulfurization-coagulation. technical background [0002] The non-ferrous metal industry will produce acidic wastewater with low pH and heavy metals in the process of metal mining, mineral processing, and smelting. If it is not treated, it will corrode infrastructure such as sewer pipes and hydraulic structures, and the heavy metals will seriously pollute the surface. Water, groundwater or soil affect the growth and reproduction of animals and plants and the growth of crops, causing great harm to environmental quality and human health. [0003] There are three main types of treatment methods commonly used for acidic wastewater containing heavy metals: [0004] (1) Remove heavy metal ions...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/28
Inventor 席北斗何连生宋博宇林振管伟雄孟睿
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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