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Treatment method of mercury-containing waste liquid

A treatment method and waste liquid technology, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of large amount of treatment chemicals, unstable operation, restrictions, etc., and achieve economical and Significant social benefits, simple process and strong applicability

Inactive Publication Date: 2017-03-15
云南大地绿坤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are limited by raw materials and disposal costs, and most of them are still in the stage of small test and pilot test, and there are certain problems in their promotion and application in engineering.
[0004] The composition of mercury-containing wastewater is complex, and the treatment standards are very strict. A single physical and chemical method has problems such as large amount of treatment chemicals, uncontrollable reaction, and unstable operation. Two or more processes are optimally combined to form a synergistic complementarity. Improving the treatment effect and reducing the treatment cost are important development trends in the research and application of mercury-containing wastewater treatment technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the mercury-containing waste liquid of a chemical plant as the treatment object, the raw water composition: pH=6.38, total mercury=669.5mg / L.

[0025] Utilize the method of the present invention to process this mercury-containing waste liquid:

[0026] Add modified coal-based activated carbon according to 8% of the total weight of the waste liquid, stir for 5 minutes and then let it stand for 45 minutes, take the filtrate after solid-liquid separation, then add lime to adjust the pH of the waste liquid to 9.0, and then add 10% of the total weight of the waste liquid Add sodium sulfide, stir for 10 minutes, and finally add FeCl 3 The solution maintains a pH of 9.0 during the entire reaction process, and the wastewater is filtered after stirring for 60 minutes, and the obtained filtrate is the treated effluent;

[0027] Water sample determination of effluent: pH=9.03, total mercury=0.008mg / L.

Embodiment 2

[0029] Taking the mercury-containing waste liquid of a scientific research unit as the treatment object, the raw water composition: pH=5.61, total mercury=25.57mg / L.

[0030] Utilize the method of the present invention to process this mercury-containing waste liquid:

[0031] Add modified coal-based activated carbon according to 2% of the total weight of the waste liquid, stir for 5 minutes and then let it stand for 30 minutes, take the filtrate after solid-liquid separation, then add lime to adjust the pH of the waste liquid to 9.5, and then add 3% of the total weight of the waste liquid Add sodium sulfide, stir for 10 minutes, and finally add FeCl 3 The solution maintains a pH of 9.5 throughout the reaction process, and the wastewater is filtered after stirring for 45 minutes, and the obtained filtrate is the treated effluent;

[0032] Water samples were tested for the effluent: pH=9.37, total mercury was not detected.

Embodiment 3

[0034] Taking the mercury-containing waste liquid of a testing unit as the treatment object, the raw water composition: pH<1, total mercury=1109.2mg / L.

[0035] Utilize the method of the present invention to process this mercury-containing waste liquid:

[0036] Add modified coal-based activated carbon according to 10% of the total weight of the waste liquid, stir for 5 minutes and then let it stand for 50 minutes, take the filtrate after solid-liquid separation, then add lime to adjust the pH of the waste liquid to 8.5, and then add 15% of the total weight of the waste liquid Add sodium sulfide, stir for 10 minutes, and finally add FeCl 3 The solution maintains a pH of 9.0 during the entire reaction process, and the wastewater is filtered after stirring for 60 minutes, and the obtained filtrate is the treated effluent;

[0037] Water sample determination of effluent: pH=9.56, total mercury=0.02mg / L.

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PUM

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Abstract

The invention relates to a treatment method of mercury-containing waste liquid, belonging to the technical field of harmless treatment of hazardous wastes. The treatment method of the mercury-containing waste liquid comprises the following steps: (1) adding a modified porous adsorption material into the mercury-containing waste liquid, standing, adsorbing, and then collecting the liquid; (2) adjusting the waste liquid after being treated in the step (1) to be alkaline; (3) adding a precipitating agent into the alkaline waste liquid obtained in the step (2); and (4) adjusting a pH value by using an iron salt solution, and keeping the alkalinity in the step (2). The method is carried out at normal temperature and normal pressure, and is simple in process, high in applicability, low in reagent price and remarkable in economic and social benefits; and mercury ions in the treated discharged water are fewer than 0.05mg / L.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of hazardous waste, and in particular relates to a treatment method for mercury-containing waste liquid. Background technique [0002] Mercury is the first of the five poisons and ranks first among the heavy metal pollutants on the earth. Its toxicity is very strong. In addition to obvious neurotoxicity, it has adverse effects on the endocrine system, immune system and other fluids. Mercury-containing wastewater mainly comes from the wastewater discharged from chemical industry, metallurgy, machinery and other industries, among which the wastewater discharged from chlor-alkali industry, electronics industry, plastics industry, mercury smelting, and mercury production is the main source. [0003] The treatment and disposal of mercury-containing wastewater is directly related to the physical and mental health of human beings. Traditional mercury-containing wastewater treatment methods inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F9/00C02F1/283C02F1/52C02F1/66C02F2101/20
Inventor 任雪娇吴启模尹砾珩张卫东邱金成李银光古家靖
Owner 云南大地绿坤环保科技有限公司