Method for reducing dissolution of noxious heavy metal components

A heavy metal and harmful technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high treatment cost, poor long-term stability of sediment, complex process, etc.

Active Publication Date: 2009-01-07
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method is currently effective, but the sediment enriched with heavy metals is prone to problems such as poor long-term stability and leakage of heavy metal components in the later stage.
Based on the above, the current treatment and utilization technologies mainly have the following problems: (1) the treatment cost is high, the process is complicated, and it is difficult to apply and popularize, such as the cost of cultivating bacteria by biochemical methods; Poor long-term stability, that is, under certain environmental conditions, the harmful components that are reduced to low prices are reduced to high-priced original components (for example, hexavalent chromium ions), causing harmful rebound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Waste liquid to be treated: 1 kg of solution with arsenic ion concentration of 0.5 mg / L.

[0021] Processing steps: burn fresh calcium oxide with limestone, add 2.5 grams of calcium oxide to the waste liquid, stir fully to form a calcium hydroxide supersaturated solution; then slowly add 2 grams of aluminum sulfate to the above aqueous solution, and drop 5M Sodium hydroxide is used to control the pH of the mixed solution above 11, fully stir for 4 hours, and let stand for 20 hours. After that, the liquid and solid phases were separated by filtration, and the solid matter was placed separately, and the concentration of arsenic in the liquid part was measured.

[0022] Results: The residual concentration of arsenic in the solution obtained after treatment was lower than 0.05 mg / L, indicating that the reduction of arsenic dissolution of harmful heavy metal components in the waste liquid reached 90% after treatment. The treated waste liquid can be discharged directly.

Embodiment 2

[0024] Waste liquid to be treated: 1 kg of a solution with a selenium ion concentration of 1 mg / L.

[0025] Processing steps: burn fresh calcium oxide with limestone, add 2.5 grams of calcium oxide to the waste liquid, stir fully to form a calcium hydroxide supersaturated solution; then slowly add 2 grams of aluminum sulfate to the above aqueous solution, and drop 5M Sodium hydroxide was used to control the pH of the mixed solution above 11, fully stirred for 6 hours, and allowed to stand for 20 hours. After that, the liquid-solid phase was separated by filtration, and the solid matter was placed separately, and the concentration of selenium in the liquid part was measured.

[0026] Results: The residual concentration of selenium in the solution obtained after treatment was lower than 0.1 mg / L, indicating that the reduction of selenium dissolution of harmful heavy metal components in the waste liquid reached 90% after treatment.

Embodiment 3

[0028] Waste liquid to be treated: 1 kg of solution, in which the concentration of chromium ions is 1 mg / L, the concentration of selenium ions is 1 mg / L, and the concentration of arsenic ions is 0.5 mg / L.

[0029] Processing steps: use limestone to burn fresh calcium oxide, add 3.8 grams of calcium oxide to the waste liquid, stir well to form a calcium hydroxide supersaturated solution; then slowly add 3 grams of aluminum sulfate to the above aqueous solution, and drop 5M Sodium hydroxide was used to control the pH of the mixed solution above 11, fully stirred for 6 hours, and allowed to stand for 24 hours. Afterwards, the liquid and solid phases were separated by filtration, and the solid matter was placed separately, and the concentrations of chromium, selenium, and arsenic in the liquid portion were measured respectively.

[0030] Results: The residual concentration of selenium in the solution obtained after treatment was lower than 0.1mg / L, the residual concentration of ch...

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Abstract

The invention provides a method for reducing environmental pollution caused by hazardous heavy metals, and relates to the treatment of hazardous heavy metals in waste liquor and waste material. The method adopts hydrated calcium aluminate sulfate to solidify hazardous heavy metal components in liquid and solid waste material. Through mixing fresh calcium oxide, aluminium sulphate and silicon dust as raw materials for preparing hydrated calcium aluminate sulfate into the incineration ash of the liquid and solid waste material containing the heavy metal components, the method effectively solidifies and inhibits the hazardous heavy metals from being dissolved out; through the treatment, the reduced amount of dissolved-out hazardous heavy metal components reaches 90%; the method has the characteristics of simple implementation and prominent treatment effects, and is not easy to cause secondary pollution.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for reducing environmental pollution by harmful heavy metals, which is used for treating waste liquid or solid waste containing heavy metals. Background technique [0002] Environmental pollution by heavy metal ions is a major problem involving many industries. The natural gas industry, coal gas industry and industrial waste all have the problem of leaching out harmful heavy metals to pollute the water environment. These soluble harmful heavy metals mainly migrate in the aqueous environment in the form of hydroxide anions. This will seriously affect the surrounding environment and human health. For this reason, my country's groundwater quality standards strictly limit its maximum dissolution in the water environment. [0003] At present, there are many methods at home and abroad to reduce the content of harmful heavy metal components in liquid waste and inhibit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62A62D3/33
Inventor 王宏霞张文生叶家元王渊张建波
Owner CHINA BUILDING MATERIALS ACAD
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