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
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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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