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Method for removing trace of thallium in sewage

A trace and sewage technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as removal that have not been seen, and achieve reduced concentration, strong surface area, and strong adsorption performance effect

Inactive Publication Date: 2015-07-15
广东云测环境科技有限公司
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Problems solved by technology

[0012] Among the existing chemical methods for removing trace amounts of thallium in wastewater, there is no method for removing trace amounts of thallium in wastewater by combining Feitong reagent-power plant furnace ash adsorption-PVC coagulation

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  • Method for removing trace of thallium in sewage

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Embodiment Construction

[0022] Below in conjunction with embodiment the present invention is further described.

[0023] see figure 1 , a method for removing trace amounts of thallium in sewage, the process steps of which are:

[0024] The first step: first adjust the pH value of the thallium-containing wastewater to 4;

[0025] The second step: adding ferrous sulfate solution to the waste water and stirring it evenly with the waste water;

[0026] The third step: add hydrogen peroxide to the waste water and stir to remove the monovalent thallium (Tl + ) is oxidized to trivalent thallium (Tl 3+ ), the mixture of ferrous iron and hydrogen peroxide is called Fei Tong's reagent;

[0027] Step 4: Add lime to the waste water and stir evenly to neutralize the pH value of the waste water to 7-9. At the same time, the trivalent iron (Fe) in the waste water 3+ ) is hydrolyzed into flocculent ferric hydroxide;

[0028] Step 5: Add an appropriate amount of power plant ash (electric dust collector ash) to ...

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Abstract

The invention relates to a method for removing a trace of thallium in sewage. The method includes the process steps of regulating the PH value of the thallium-contained sewage to 4, adding a ferrous sulfate solution to the sewage, evenly mixing the sewage with the ferrous sulfate solution, adding hydrogen peroxide to the sewage again, conducting stirring, oxidizing fluorosis univalence thallium (T1+) in the sewage into tervalence thallium (T13+), mixing ferrous iron and hydrogen peroxide into a fenton reagent, adding lime to the sewage and evenly conducting stirring so that the PH value of the sewage can be neutralized to be 7 to 9, hydrolyzing tervalence iron (Fe3+) in the sewage at the same time to form flocculent ferric hydroxide, adding an appropriate amount of power plant stove ash (electric duct collector stove ash) to the sewage, evenly conducting stirring, and adding a polyaluminium sulfate solution so that ferric hydroxide and thallium hydroxide can be adsorbed to the stove ash. Flocculent sediment generated through hydrolysis has the great surface area and quite strong adsorption capacity; the power plant stove ash can adsorb the flocculent sediment and colloid particles in the sewage and sink.

Description

technical field [0001] The invention belongs to the technical field of thallium removal methods, and relates to a method for removing trace thallium in sewage. Background technique [0002] Thallium is a highly toxic and harmful substance, its toxicity far exceeds that of As, Hg, Cd, Pb, and Cu, and it has a certain accumulation property, and its toxic effect can last for a long time. Thallium pollution of water bodies is extremely harmful to public health. Thallium has two oxidation states in nature: T1+ and Tl 3+ . The properties of T1+ compounds are similar to those of alkali metals and are easily soluble in water. [0003] Thallium in water exists T1+ and Tl 3+ Both forms, the hydroxide TlOH of T1+, are soluble in water and cannot be settled by the usual lime precipitation method. Tl3+ is oxidizing: [0004] Tl 3+ (aq)+2e-->Tl + (aq)+1.25V; [0005] Thanks to Tl 3+ It has a strong coordination ability. When there are ligands, the electrode potential will ine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 彭娟
Owner 广东云测环境科技有限公司
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