Treatment method of heavy metals in desulfurization waste water

A technology for desulfurization wastewater and heavy metals, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of strict reaction environment requirements, secondary environmental pollution, harsh reaction conditions, etc. , achieving good economic and environmental benefits, stable sediment, and avoiding leaching

Inactive Publication Date: 2013-10-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that biological treatment and other physical and chemical methods are difficult to promote and use in practical engineering due to high cost and harsh reaction conditions.
[0005] The removal of heavy metals in desulfurization wastewater from thermal power plants is mainly achieved by chemical precipitation. At present, neutralization precipitation and sulfide precipitation are mostly used to precipitate heavy metals in the form of sulfide and hydroxide. Heavy metals have a good removal effect, but sulfide precipitation has strict requirements on the reaction environment and must be carried out in an alkaline environment. Hydrogen sulfide gas will be generated under acidic conditions, causing secondary environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1L of desulfurization wastewater and add Fe 2 (SO 4 ) 3 and FeSO 4 , and control n(Fe 2+ ): M is 10 (M represents the sum of the amount of various metal ions in the wastewater), n(Fe 3+ ):n(Fe 2+ ) is 1.5, where FeSO 4 The concentration of the solution is 3.5mmol / L, and then NaOH solution is added to adjust the pH of the solution to 8. In order to mix all kinds of additives evenly, the solution is mechanically stirred for 15min. After the components in the solution are mixed evenly, the metal ions form After ferrite, let the desulfurization wastewater age for 1 hour, and then use the method of filtration for solid-liquid separation, and then add 1.0 g of zeolite to the treated desulfurization wastewater for physical adsorption. The adsorption time is 1 hour, and then measure the concentration of heavy metal ions in the desulfurization wastewater. The removal rate of heavy metal ions is shown in Table 1.

Embodiment 2

[0029] Take 1L of desulfurization wastewater and add Fe 2 (SO 4 ) 3 and FeSO 4 , and control n(Fe 2+ ): M is 8 (M represents the sum of the amount of various metal ions in the wastewater), n(Fe 3+ ):n(Fe 2+ ) is 2, where FeSO 4 The concentration of the solution is 3.5mmol / L, and then NaOH solution is added to adjust the pH of the solution to 8. In order to mix all kinds of additives evenly, the solution is mechanically stirred for 15min. After the components in the solution are mixed evenly, the metal ions form After ferrite, let the desulfurization wastewater age for 1 hour, and then use the method of filtration for solid-liquid separation, and then add 1.0 g of zeolite to the treated desulfurization wastewater for physical adsorption. The adsorption time is 1 hour, and then measure the concentration of heavy metal ions in the desulfurization wastewater. The removal rate of heavy metal ions is shown in Table 1.

Embodiment 3

[0031] Take 1L of desulfurization wastewater and add Fe 2 (SO 4 ) 3 and FeSO 4 , and control n(Fe 2+ ): M is 10 (M represents the sum of the amount of various metal ions in the wastewater), n(Fe 3+ ):n(Fe 2+ ) is 1.5, where FeSO 4 The concentration of the solution is 3.5mmol / L, and then NaOH solution is added to adjust the pH of the solution to 9. In order to mix all kinds of additives evenly, the solution is mechanically stirred for 15min. After the components in the solution are mixed evenly, the metal ions form After ferrite, let the desulfurization wastewater age for 1 hour, and then use the method of filtration for solid-liquid separation, and then add 1.0 g of zeolite to the treated desulfurization wastewater for physical adsorption. The adsorption time is 1 hour, and then measure the concentration of heavy metal ions in the desulfurization wastewater. The removal rate of heavy metal ions is shown in Table 1.

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Abstract

The invention discloses a treatment method of heavy metals in desulfurization waste water, and belongs to the technical field of waste water treatment. A combination method of chemical precipitation and physical adsorption treatment is adopted to remove the heavy metals in the desulfurization waste water. The chemical precipitation method uses a ferrite precipitation method that a process condition is controlled by adding ferric and ferrous salts into desulfurization slurry, so that various metal ions such as Cd, Pb, Hg, Cu, Zn, Cr and Ni in the waste water form an insoluble composite ferrite; after aging for a period of time, a solid-liquid separation means is used to achieve the object of removing the heavy metal ions; a natural adsorbent is used for adsorbing the residual heavy metals in the desulfurization waste water, therefore the discharge standard of the heavy metal ions in the desulfurization waste water is achieved. The method has the advantages of simple process, good sediment stability, high removal efficiency of heavy metals and good environmental benefits, and effectively solves the secondary pollution problem of heavy metals.

Description

[0001] Technical field [0002] The invention involves the field of wastewater treatment technology, and it is specific to a method of heavy metal in a desulfurization wastewater. Background technique [0003] Limestone-gypsum wet desulfurization is widely used in the advantages of mature technology, high desulfurization efficiency, high infrastructure province, and stable operation., Overpatient sulfate, sulfate, fluoride, and heavy metal impurities, especially heavy metals such as CD, HG, PB, CU, Zn, CR, Ni, etc., have become difficult to deal with desulfurization wastewater.Solving the main technical issues. [0004] In recent years, there are three main methods for treatment of heavy metal wastewater treatment at home and abroad: the first category is to remove heavy metals in the wastewater through chemical reactions, mainly in the neutralization method, sulfide precipitation method, iron oxygen precipitation method, chemical restoration and high heightMolecular heavy metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/12
Inventor 胡将军陈思维
Owner WUHAN UNIV
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