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A common harmless disposal method for mercury-exceeding wastewater

A disposal method and technology for wastewater, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of complex mercury-containing waste liquid, unable to meet the requirements of thorough and harmless treatment of mercury, etc. , to achieve the effect of easy promotion, low cost and simple operation

Active Publication Date: 2021-02-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For mercury-containing waste liquid with high mercury concentration and complex forms, ordinary sewage treatment methods can no longer meet the requirements for thorough and harmless treatment of mercury

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The mercury-containing waste water that the present embodiment adopts is the acidic Hg(NO 3 ) 2 solution.

[0046] The invention provides a general harmless treatment method for mercury exceeding the standard wastewater, and its specific steps are as follows:

[0047] (1) adding an appropriate amount of NaOH to the mercury-containing wastewater to alkalinize it, adjusting the pH value of the solution to 11.5, and using magnetic stirring to uniformly stir the waste liquid during the experiment to obtain a mixed solution 1;

[0048] (2) Add an appropriate amount of Na to the mixed solution 1 2 S, make Na 2 The input amount of S is 60 times of the mercury content, and the waste liquid is uniformly stirred by magnetic stirring to obtain the mixed liquid 2;

[0049] (3) Add appropriate amount of H to the mixture 2 2 SO 4 , the pH value of the mixed solution was adjusted to be reduced to 4.7, and the waste liquid was evenly stirred by magnetic stirring during the experi...

Embodiment 2

[0056] The mercury-containing wastewater used in this embodiment is acidic K with a mercury concentration of 9.3 mg / L. 2 HgI 4 solution.

[0057] The invention provides a general harmless treatment method for mercury exceeding the standard wastewater, and its specific steps are as follows:

[0058] (1) adding an appropriate amount of KOH to the mercury-containing wastewater to alkalinize it, adjusting the pH value of the solution to 12.6, and using magnetic stirring to uniformly stir the waste liquid during the experiment to obtain a mixed solution 1;

[0059] (2) Add an appropriate amount of K to the mixture 1 2 S, make K 2 The input amount of S is 120 times of the mercury content, and the waste liquid is uniformly stirred by mechanical stirring to obtain the mixed liquid 2;

[0060] (3) Add an appropriate amount of HCl to the mixed solution 2, adjust the pH value of the mixed solution to 3.2, and use mechanical stirring to uniformly stir the waste liquid during the exper...

Embodiment 3

[0067] Mercury-containing wastewater adopted in this embodiment is mercury-contaminated soil treated with Na 2 S 2 o 3 The leaching waste liquid produced by leaching treatment has a mercury concentration of 9.3mg / L.

[0068] The invention provides a general harmless treatment method for mercury exceeding the standard wastewater, and its specific steps are as follows:

[0069] (1) Add appropriate amount of Ca(OH) to mercury-containing wastewater 2 Alkaline treatment was carried out to adjust the pH value of the solution to 13.1. During the experiment, the waste liquid was evenly stirred by mechanical stirring to obtain the mixed liquid 1;

[0070] (2) Add an appropriate amount of MgS to the mixed solution 1, so that the input amount of MgS is 200 times of the mercury content, and adopt the mode of mechanical stirring to uniformly stir the waste liquid to obtain the mixed solution 2;

[0071] (3) Add appropriate amount of HNO to the mixture 2 3 , the pH value of the mixed s...

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Abstract

The invention provides a general harmless treatment method for mercury-exceeding wastewater. The steps of the method are as follows: (1) carry out alkalization pretreatment on mercury-containing wastewater, adjust its pH value to 11.5-13.1, and stir evenly to obtain Mixed solution 1; (2) Add sulfide with a mass ratio of more than 60 times to mixed solution 1, and stir evenly to obtain mixed solution 2; (3) Add appropriate amount of acid solution to mixed solution 2 to adjust the pH value to 1.8-4.7 , uniformly stirred to obtain the mixed solution 3; (4) the mixed solution 3 is subjected to solid-liquid separation to obtain the processed liquid phase 1 and the solid phase 1; (5) detect the concentration of mercury in the liquid phase 1 after the treatment, and evaluate its safety; (6) The obtained solid phase 1 is dried at low temperature to obtain the solid phase 2; (7) The solid phase 2 is solidified with cement and maintained for a long time to obtain the solid phase 3; (8) The solid phase 3 is subjected to toxic leaching Detect and evaluate its safety. The invention has the advantages of thorough treatment, no pollution, simple operation, low cost and strong versatility.

Description

technical field [0001] The invention proposes a general harmless treatment method for mercury-exceeding-standard wastewater, which belongs to the research field of heavy metal water pollution control. Background technique [0002] Mercury and mercury compounds are extremely toxic and have attracted worldwide attention. Among the many forms of mercury, active mercury has the greatest impact on the environment, especially methylmercury, which can be enriched in humans and animals through the food chain, and will seriously harm the central nervous system of animals and humans. Among the many environmental hazards of mercury, the pollution of mercury to water bodies is the most easily transferred and the most serious, and urgently needs to be treated. In the Minamata disease incident in Japan in 1956, tens of thousands of people were harmed by methylmercury in fish and shrimp, resulting in thousands of deaths. [0003] At present, there are mainly the following methods for the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/00C02F11/13C02F101/20
CPCC02F1/001C02F1/62C02F1/66C02F9/00C02F11/008C02F11/12C02F2101/20C02F2301/08
Inventor 张梅郭敏卢光华刘仕业
Owner UNIV OF SCI & TECH BEIJING
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