Efficient and economic mercury-containing waste water treatment method

A waste water treatment and economical technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult resin recycling, large investment in treatment equipment and high treatment cost, Achieve the effect of low cost, wide application range and simple operation

Active Publication Date: 2012-04-18
SHAANXI JINTAI CHLOR ALKALI CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The sulfide precipitation method has suspended mercury-containing molecular aggregates, which are difficult to condense into solid-liquid separation. The total mercury content in the treated water usually exceeds 0.005mg / L; the ion exchange method and activated carbon adsorption method have high treatment costs and are not suitable for initial concentration. High mercury-containing wastewater, and the resin after adsorption is difficult to recycle; solvent extraction method is not suitable for the treatment of a large amount of water in industry, and the solvent in water needs to be treated again; metal reduction method is used in foreign water mercury treatment, and the investment in treatment equipment is large ,high cost

Method used

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  • Efficient and economic mercury-containing waste water treatment method
  • Efficient and economic mercury-containing waste water treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Example 1 Acidic wastewater with a total mercury concentration of 50mg / L~200mg / L

[0013] The total mercury content of the sample wastewater before treatment is 150~200mg / L, and the hydrochloric acid content is 10%~15%. Add solid sodium hydroxide or lime milk to make the pH value of the water between 9~13. After mixing, mercury precipitates in the water and separated. The total mercury content of the clear liquid is less than 0.6mg / L.

[0014] The pH value of the clear liquid is between 9-13, add dithiocarbamic acid polymer DTCR solution (dithiocarbamic acid content 10%-15%) according to 0.02%~0.2% of the clear liquid volume, and adjust after mixing. When the pH value is between 3 and 7, the mercury in the solution is chelated and precipitated. Add a 10% ferric chloride solution flocculant with a mass fraction of 0.001 to 0.01 according to the volume ratio of the clear liquid, and separate the liquid and solid to obtain the treated clear liquid. The total mercury content me...

Embodiment 2

[0015] Example 2 Acidic wastewater with a total mercury concentration of 30mg / L~50mg / L

[0016] Before the sample wastewater treatment, the total mercury content is 30mg / L~50mg / L, the pH value is 1~3, add the calcium carbide slag slurry water clear liquid, adjust the pH value between 9~13, after mixing, precipitate mercury precipitation, and separate the clear The total amount of mercury in the liquid is less than 0.6 mg / L.

[0017] The pH value of the clear liquid is between 9 and 13, add 0.01% to 0.1% of the weight of the clear solution modified dithiocarbamate starch (dithiocarbamate content 20-30%), adjust the pH value between 3-7 At the same time, the mercury in the solution was chelated and precipitated. Add a 10% polyferric sulfate solution with a mass fraction of 0.001 to 0.01 in the volume ratio of the clear liquid. The treated clear liquid was obtained by liquid-solid separation. The total mercury content was determined to be 0.0001 by cold atomic absorption method. ~0.0...

Embodiment 3

[0018] Example 3 Alkaline wastewater with a total mercury concentration of 2.2mg / L~2.8mg / L

[0019] The total mercury content of the sample wastewater before treatment is 2.2mg / L~2.8mg / L, the pH value is 9~10, sodium sulfide is added, the pH value is adjusted between 9~13, the mercury precipitates out after mixing, and the clear liquid is separated Total mercury is less than 0.6mg / L

[0020] The pH value of the clear liquid is between 9-13, and the TMT solution of trimercaptotriazine trisodium (TMT content 10%-15%) is added according to 0.02%~0.2% of the volume of the clear liquid. After mixing, adjust the pH value at 3~ Between 7, the mercury in the solution was chelated and precipitated. Add 10% polyaluminum chloride with a mass fraction of 0.001 to 0.01 in the volume ratio of the clear liquid. The clear liquid obtained from the liquid-solid separation was measured by cold atomic absorption method to determine the total mercury content of 0.0001 mg / L~0.001mg / L.

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Abstract

the invention relates to an efficient and economic mercury-containing waste water treatment method. The efficient and economic mercury-containing waste water treatment method comprises the following steps of 1, adding an alkaline substance into high-concentration mercury-containing waste water so that the total mercury concentration is reduced to mercury concentration below 0.6mg / L, and 2, when the total mercury concentration of the high-concentration mercury-containing waste water is below 0.6mg / L, adding a sulfur-containing chelating agent into the high-concentration mercury-containing waste water according to 0.005 to 0.2% of the volume of the high-concentration mercury-containing waste water, adjusting a pH value of the mixed solution to a pH value of 3 to 7, adding 0.5 to 10% by mass of a flocculating agent into the clear solution according to a flocculating agent-clear solution volume ratio of 0.001 to 0.01 when mercury in the mixed solution is separated out, and carrying out solid-liquid separation after flocculating to obtain clarified waste water of which total mercury content is below 0.001mg / L. The efficient and economic mercury-containing waste water treatment method has the advantages that mercury removal efficiency is high; a scope of application is wide; a preparation treatment cost and a low equipment investment are low; and mercury-containing precipitates are gathered naturally and solid waste residues are treated centrally so that recovery and recycle are easy.

Description

Technical field [0001] The invention belongs to a wastewater treatment method, and particularly relates to an efficient and economical mercury-containing wastewater treatment method. Background technique [0002] Current treatment methods for mercury-containing wastewater include sulfide precipitation, ion exchange, activated carbon adsorption, solvent extraction, and metal reduction. [0003] Sulfide precipitation method has suspended mercury-containing molecular aggregates, which is difficult to agglomerate solid-liquid separation. The total mercury content in the treated water usually exceeds 0.005mg / L; ion exchange method and activated carbon adsorption method have high processing costs and are not suitable for initial concentration High mercury-containing wastewater, and the resin after adsorption is difficult to recycle; the solvent extraction method is not suitable for the treatment of a large amount of water in the industry, and the solvent in the water needs to be treated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 赵驰峰罗红侯晓辉和虎
Owner SHAANXI JINTAI CHLOR ALKALI CHEM CO LTD
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