A method for removing heavy metals in industrial sewage

A technology for industrial sewage and heavy metals, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., to achieve the effect of simple process flow and strong versatility

Active Publication Date: 2016-03-23
杭州立佳环境服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is still a lack of a mature and easy-to-operate method for removing heavy metals from general industrial wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The industrial sewage is a developing solution, and after the silver chloride precipitation is recovered by salt extraction, a small amount of silver ions and copper ions remain in the developing solution, which does not meet the discharge standard. Adjust the pH value of the waste water to 7.3; add excess sodium sulfide until the pH value is 9.5, and react for 30 minutes; add an appropriate amount of ferrous sulfate under stirring to make the pH value 7, and stir for 30 minutes; press filter, and the filtrate meets the three categories Emission Standards.

Embodiment 2

[0032] The industrial sewage is a copper-containing waste liquid. After the COD is removed by Fenton oxidation, the pH value is first adjusted to 7.5, and then an appropriate amount of sodium sulfide is added until the pH value is 9.8. After 30 minutes of reaction, an appropriate amount of sulfurous acid is added under stirring. Iron, make the pH to 7.3, stir for 30min; press filter, the filtrate meets the three emission standards.

Embodiment 3

[0034] The industrial sewage is nickel-containing waste water, first adjust the pH value to 7.2; add an appropriate amount of sodium sulfide until the pH value is 9.6, and react for 30 minutes; then add an appropriate amount of ferrous sulfate under stirring to make the pH value to 7.2, and stir 30min, centrifugal separation; the filtrate complies with the three types of discharge standards.

[0035] In summary, the method for removing heavy metals in industrial sewage provided by the present invention adds sodium sulfide under the condition of a pH value of 7-8, so that the pH value of the waste water is 9-10. Ions react to form sulfide precipitation, which can effectively prevent the generation of toxic gas hydrogen sulfide; then use ferrous sulfate to generate ferrous sulfide precipitation from excess sulfide ions to remove the pollution caused by excess sulfide ions, and use ferrous sulfate to The weak acidity of iron can adjust the pH value of wastewater back to neutral w...

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PUM

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Abstract

The invention discloses a method for eliminating heavy metal in industrial sewage. The method comprises the following steps: adjusting the pH value of industrial sewage to be 7-8; subsequently adding sodium sulfide, adjusting the pH value to be 9-10, and reacting sulfur ions with most heavy metal ions so as to generate a precipitate of sulfide, wherein the generation of a harmful gas hydrogen sulfide is effectively prevented; subsequently adding ferrous sulfate while stirring, and reacting with sulfur ions to generate a precipitate of ferrous sulfide and eliminate pollution caused by redundant sulfur ions; adjusting the pH value of the industrial sewage back to be neutral by utilizing the faintly acid of ferrous sulfate, wherein the pollution that a harmful gas hydrogen sulfide can be generated when the pH value is adjusted by using acid is also avoided; press-filtering and subsequently discharging. The method for eliminating the heavy metal in the industrial sewage is simple in process procedure and high in universality, and requirements for eliminating heavy metal in various industrial sewage can be met.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment containing heavy metals, in particular to a method for removing heavy metals in industrial sewage. Background technique [0002] Since the 20th century, the rapid development of science and technology has promoted economic development and improved people's living standards. However, at the same time, human beings have also paid a heavy price. The main source of heavy metal pollution is industrial pollution, followed by traffic pollution and household waste pollution. Industrial pollution is mostly discharged into the environment through waste residue, waste water, and waste gas, and is enriched in humans, animals, and plants, thereby causing great harm to the environment and human health. Therefore, scientists from all over the world have paid great attention to solving this problem. The problem is looming. [0003] At present, the methods of heavy metal wastewater treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/52C02F1/62
Inventor 陈清艳骆有斌戴剑波邓小兵
Owner 杭州立佳环境服务有限公司
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