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Emergency treatment method for sudden thallium pollution of drinking water in water source area

A technology for emergency treatment and drinking water, applied in the field of water treatment, which can solve the problems of safety loopholes and the inability to achieve the effect of removing Tl, and achieve the effect of simple operation, easy realization, and high water discharge height

Inactive Publication Date: 2013-04-24
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent application 201110024148.5 discloses an emergency treatment method for thallium-contaminated raw water. The application is mainly to add oxidant, ozone and polyaluminum chloride to the raw water to oxidize and co-precipitate the thallium element in the raw water. This emergency treatment method is suitable for dealing with the comparison of Tl content. Low (Tl content ≤ 0.303μg / L) thallium-contaminated raw water, and thallium-contaminated raw water with high Tl content (Tl content ≥ 10μg / L) cannot achieve a good Tl removal effect, and there are security loopholes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) To Tl 3+ Calcium oxide was added to the polluted raw water with a concentration of 9.71 μg / L to make the pH of the solution 7.92,

[0028] Then add sodium hypochlorite so that the concentration of sodium hypochlorite is 4mg / L, and stir at room temperature for 60min to obtain mixed solution A;

[0029] (2) Add ferric chloride to the mixed solution A in step (1), so that the concentration of ferric chloride is 9mg / L,

[0030] Stir evenly to obtain the mixed solution B; the stirring program is: 238r / min-1min, 85r / min-5min, 45r / min-10min;

[0031] (3) Let the mixture B in step (2) stand for 60 minutes, take the supernatant, and inject the supernatant at a constant speed (the flow rate is 540mL / h, the flow rate is 16cm / h; the same below.) Glass filter column (inner diameter is 65mm, the filling height of the sponge body is 30cm, and the particle size of the sponge body is 150 mesh; the same below.) to filter to obtain drinking water;

[0032] After testing (GB / T5750.6...

Embodiment 2

[0034] (1) To Tl 3+ Add calcium oxide to the polluted raw water with a concentration of 9.71 μg / L to make the pH of the solution 8.01, then add sodium hypochlorite to make the concentration of sodium hypochlorite 4 mg / L, stir at room temperature for 60 minutes, and obtain a mixed solution A;

[0035] (2) Add ferric chloride to the mixed solution A in step (1), so that the concentration of ferric chloride is 9mg / L,

[0036] Stir evenly to obtain the mixed solution B; the stirring program is: 242r / min-1min, 81r / min-5min, 35r / min-10min;

[0037] (3) After the mixed solution B in step (2) was left to stand for 60 minutes, the supernatant was taken, and the supernatant was injected into a glass filter column at a constant speed for filtration to obtain drinking water;

[0038] After testing, the T1 of the supernatant 3+ Concentration is 0.21 μ g / L, and the Tl of described drinking water 3+ The concentration is 0.006μg / L, pH=7.56, reaching the national drinking water standard.

Embodiment 3

[0040] (1) To Tl 3+ Add calcium oxide to the polluted raw water with a concentration of 9.71 μg / L to make the pH of the solution 7.83, then add sodium hypochlorite to make the concentration of sodium hypochlorite 4 mg / L, stir at room temperature for 60 minutes, and obtain a mixed solution A;

[0041] (2) Add ferric chloride to the mixed solution A in step (1) so that the concentration of ferric chloride is 12mg / L, and stir evenly to obtain mixed solution B; the stirring procedure is: 252r / min-1min, 89r / min-5min, 62r / min-10min;

[0042] (3) After the mixed solution B in step (2) was left to stand for 60 minutes, the supernatant was taken, and the supernatant was injected into a glass filter column at a constant speed for filtration to obtain drinking water;

[0043] After testing, the T1 of the supernatant 3+ Concentration is 0.23 μ g / L, and the Tl of described drinking water 3+ The concentration is 0.006μg / L, pH=6.68, reaching the national drinking water standard.

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Abstract

The invention discloses an emergency treatment method for sudden thallium pollution of drinking water in a water source area. Enhanced coagulation-filtration combined technology is adopted by the method, calcium oxide is added into polluted raw water to cause the polluted raw water to be alkaline, a coagulating agent of ferric trichloride is then added, Fe<3+> and a prepolymerization product thereof are rapidly hydrolyzed by means of the reaction that a ferric ion and a hydroxyl react to generate ferric hydroxide flock, before the flock becomes larger, TI<3+> in the polluted raw water is adsorbed on the surface of the flock to form covalent bonds, and the process is very fast; in a few minutes, the flock grows larger and continues adsorbing the TI<3+> in the polluted raw water, and simultaneously, the TI<3+> and the Fe<3+> in the polluted raw water are subjected to coprecipitation reaction to further remove the TI<3+>. The method provided by the invention is easy to implement, convenient in operation, and capable of reducing the TI<3+> at the concentration not less than 10mu g / L in the polluted raw water to the concentration not greater than 0.01mu g / L, and has the characteristics of safety, reliability, and highly qualified yielding water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an emergency treatment method for sudden thallium pollution of drinking water in water sources. Background technique [0002] Thallium (Tl) is a typical highly toxic heavy metal element. Although it is widely distributed in the earth's crust, its content is very low. It is mainly accompanied by mining, metal smelting, and coal mine processing. Geochemical cycles that pose pollution hazards and risks to the environment. Tl can enter the human body through drinking water, where Tl + K can be replaced during the enzymatic reaction of the human body + , and have a strong affinity with the enzyme, thereby inducing the toxic effect of Tl. Activated aluminum purification method, ion exchange method, columnar activated carbon, etc. can be used to remove Tl from drinking water. The U.S. Environmental Protection Agency stipulates that the discharge standards for drinking water ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 虢清伟许振成邴永鑫
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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