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Method for eliminating heavy metal 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: 2014-03-19
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

[0027] The industrial sewage is a developing solution. After the silver chloride precipitation is recovered by salt extraction, a small amount of silver ions and copper ions still remain in the developing solution, which does not meet the emission standards. Adjust the pH value of the wastewater to 7.3; add excess sodium sulfide to pH 9.5, and react for 30 MIN; add appropriate amount of ferrous sulfate under stirring to make the pH value 7, and stir for 30 MIN; press filter, the filtrate meets three categories Emission Standards.

Embodiment 2

[0029] The industrial sewage is copper-containing waste liquid. After COD is removed by Fenton oxidation, the pH value is adjusted to 7.5 first, and then an appropriate amount of sodium sulfide is added to the pH value of 9.8. The reaction is 30min, and then 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 third-class emission standard.

Embodiment 3

[0031] The industrial wastewater is nickel-containing wastewater. First adjust the PH value to 7.2; then add an appropriate amount of sodium sulfide to the pH value of 9.6, and the reaction is 30min; 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 meets the third-class emission standards.

[0032] In summary, the method for removing heavy metals in industrial sewage provided by the present invention adds sodium sulfide under the condition of pH 7-8 to make the pH of wastewater 9-10. At this time, not only sulfide ions can interact with most heavy metals Ion reaction generates sulfide precipitation, and can effectively prevent the production of toxic hydrogen sulfide; then use ferrous sulfate to convert excess sulfide ions into ferrous sulfide precipitation to remove the pollution caused by excess sulfide ions, and at the same time use sulfurous sulfate The weak acidity of iron can a...

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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 Applications(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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