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Treating process of mercury-containing waste water

A waste water and water treatment technology, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve problems such as low degree of industrialization, polluted environment, poor removal effect, etc., and achieve simplified operation procedures, the effect of reducing processing costs

Inactive Publication Date: 2007-01-17
周石来
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A large amount of mercury-containing wastewater will be produced in the chemical production process. For example, in the process of producing polyvinyl chloride by the calcium carbide method, a large amount of mercury-containing wastewater containing HgCl will be produced due to the use of mercuric chloride as a catalyst. If this mercury-containing wastewater is not effectively Disposal will seriously pollute the environment
At present, in the relevant literature at home and abroad, there is no treatment method for wastewater with high mercury content. Chinese patent CN00131216.2 discloses a method for removing arsenic, lead, chromium, cadmium, and mercury in drinking water. The method of adding bleaching powder, ferrous sulfate and sodium hydroxide to the treated water is used to remove five elements, and the principle of mercury removal is to make mercury generate Hg 2 CrO 4 and HgO, and then use the characteristics of strong adsorption capacity of ferric hydroxide and ferrous hydroxide in alkaline environment to carry out adsorption and precipitation. This method is difficult to apply in actual production, the degree of industrialization is low, the removal effect is poor, and filtration is difficult, especially difficult Treatment of High Concentration Mercury Wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The present invention treats the mercury-containing waste water produced by PVC production. Before the treatment, the Hg content is 13.2601 mg / L. Add Hg and Na 2 Na with a molar ratio of S of 1:1 and a molar concentration of 0.2 2 S solution, so that the Hg and Na in the treated water 2 S reacts to generate HgS, adjust the pH value between 7-9, and then add polyacrylamide with a molar concentration of 0.02 at a molar ratio of Hg: organic flocculant of 1:0.02 to form HgS flocculent precipitate, and the obtained material Filter to separate the HgS flocculent precipitate from the treated water to obtain a qualified aqueous solution. The treated aqueous solution is measured by cold atomic absorption method using CG-1C cold atom IMJ mercury detector according to GB7468-87 standard, and the mercury content is 0.0391mg / L, which meets the emission requirement of the national standard of less than 0.05mg / L.

Embodiment 2

[0015] The present invention treats the mercury-containing waste water produced by PVC production. Before the treatment, the Hg content is 3.6689 mg / L. Add Hg and Na 2 The molar ratio of S is 1:1.1 Na with a molar concentration of 0.1 2 S solution, so that the Hg and Na in the treated water 2 S reacts to generate HgS, adjust the pH value between 7-9, and then add water-soluble starch with a molar concentration of 0.01 at a ratio of Hg: organic flocculant molar ratio of 1:0.01 to form HgS flocculent precipitate, and the obtained material Filter to separate the HgS flocculent precipitate from the treated water to obtain the treated aqueous solution. The treated aqueous solution is measured by cold atomic absorption method using CG-1C cold atom IMJ mercury detector according to GB7468-87 standard, and the mercury content is 0.0309mg / L, which meets the emission requirement of the national standard of less than 0.05mg / L.

Embodiment 3

[0017] The present invention treats the mercury-containing waste water produced by PVC production. Before the treatment, the Hg content is 1.5262 mg / L. Add Hg and Na 2 The molar ratio of S is 1:1 and the molar concentration is 0.1 Na 2 S solution, so that the Hg and Na in the treated water 2 S reacts to generate HgS, adjust the pH value between 7-9, and then add polypropylene methyl ether with a molar concentration of 0.02 at a molar ratio of Hg:organic flocculant of 1:0.02 to form HgS flocculent precipitate, and the obtained material Filter to separate the HgS flocculent precipitate from the treated water to obtain the treated aqueous solution. The obtained aqueous solution is measured by cold atomic absorption method and CG-1C cold atom IMJ mercury detector according to GB7468-87 standard, and the mercury content is 0.0299mg / L , to meet the national emission requirements of less than 0.05mg / L.

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Abstract

The treating process of mercury-containing waste water includes adding Na2S solution into mercury-containing waste water to react and produce HgS, regulating pH value in 7-9, adding organic flocculent in certain amount to form flaky HgS precipitant, and filtering to eliminate the precipitant and to obtain treated water. The present invention is simple and low in cost and the treating process produces no secondary pollutant. When the mercury content is high, Na2S solution adding amount may be increased and the reaction end pH value is controlled to reach ideal treating effect.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a mercury-containing wastewater treatment method. Background technique [0002] A large amount of mercury-containing wastewater will be produced in the chemical production process. For example, in the process of producing polyvinyl chloride by the calcium carbide method, a large amount of mercury-containing wastewater containing HgCl will be produced due to the use of mercuric chloride as a catalyst. If this mercury-containing wastewater is not effectively Disposal will seriously pollute the environment. At present, in the relevant literature at home and abroad, there is no treatment method for wastewater with high mercury content. Chinese patent CN00131216.2 discloses a method for removing arsenic, lead, chromium, cadmium, and mercury in drinking water. The method of adding bleaching powder, ferrous sulfate and sodium hydroxide to the treated water is used to remove five element...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/56C02F1/62C02F1/58C02F1/66C02F101/20C02F1/54
Inventor 周石来
Owner 周石来