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Method for removing thallium pollution in source water of drinking water

A technology for water source water and pollution concentration, applied in the field of water treatment, can solve problems such as inappropriate removal, and achieve the effects of improving removal rate, flexible application and removing thallium pollution

Active Publication Date: 2012-01-18
东莞市水务集团供水有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of dosage of powdered activated carbon of 40mg / L and initial concentration of thallium of 0.2μg / L and 0.5μg / L, the removal rate of thallium is only 15~19%. Therefore, powdered activated carbon has no obvious removal effect on thallium and is not suitable for drinking water. Removal of Thallium Pollution in Source Water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for removing thallium pollution in drinking water source water, it comprises the following steps:

[0025] a. Adjust the PH value. After routine detection of thallium pollution concentration in drinking water source water is 0.32 μg / L, adjust the pH value of drinking water source water to 9.0 with sodium hydroxide solution;

[0026] B, preoxidation, adopt potassium permanganate as the preoxidant of thallium, carry out preoxidation treatment to thallium, make Tl + Convert to Tl 3+ , add 2.0 mg / L potassium permanganate to the drinking water source water after the pH value has been adjusted in step a, and the oxidation time is 30 minutes;

[0027] c, coagulation and precipitation, add 2.4 mg / L polyaluminum chloride (as Al to the drinking water source water after step b preoxidation 2 o 3 count), so that the Tl in drinking water source water 3+ Form Tl(OH) 3 Precipitation, sand filtration process can be used to remove thallium in drinking water source water....

Embodiment 2

[0031] A method for removing thallium pollution in drinking water source water, it comprises the following steps:

[0032] a. Adjust the PH value. The concentration of thallium pollution in drinking water source water is routinely detected to be 0.41 μg / L, and the pH value of drinking water source water is adjusted to 9.2 with sodium hydroxide solution;

[0033] B, preoxidation, adopt potassium permanganate as the preoxidant of thallium, carry out preoxidation treatment to thallium, make Tl + Convert to Tl 3+ , add 1.5 mg / L potassium permanganate to the drinking water source water after the pH value has been adjusted in step a, and the oxidation time is 40 minutes;

[0034] c, coagulation and precipitation, add 2 mg / L polyaluminum chloride (as Al to the drinking water source water after step b preoxidation 2 o 3 count), so that the Tl in drinking water source water 3+ Form Tl(OH) 3 Precipitation, sand filtration process can be used to remove thallium in drinking water s...

Embodiment 3

[0038] A method for removing thallium pollution in drinking water source water, it comprises the following steps:

[0039]a. Adjust the PH value. After routine detection of thallium pollution concentration in drinking water source water is 0.52 μg / L, adjust the pH value of drinking water source water to 9.2 with sodium hydroxide solution;

[0040] B, preoxidation, adopt potassium permanganate as the preoxidant of thallium, carry out preoxidation treatment to thallium, make Tl + Convert to Tl 3+ , add 2.5 mg / L potassium permanganate to the drinking water source water after the pH value has been adjusted in step a, and the oxidation time is 20 minutes;

[0041] c, coagulation and precipitation, add 2 mg / L polyaluminum chloride (as Al to the drinking water source water after step b preoxidation 2 o 3 count), so that the Tl in drinking water source water 3+ Form Tl(OH) 3 Precipitation, sand filtration process can be used to remove thallium in drinking water source water.

...

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PUM

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Abstract

The invention belongs to the technical field of water treatment, and especially relates to a method for removing thallium pollution in source water of drinking water, which comprises the following steps: a. adjusting the pH value, when the concentration of thallium pollution is not more than 1 microgram / L, adjusting the pH value to 9.0-9.5; when the concentration of thallium pollution is 1 microgram / L-5 microgram / L, adjusting the pH to 9.5-10.0; b. performing preoxidation, allowing Tl+ to be converted into Tl3+ by using potassium permanganate as a preoxidate for thallium, adding 1.5-2.5 mg / L of potassium permanganate, wherein the oxidation time is 20-40 min; c. performing coagulation and sedimentation, adding polyaluminium chloride, allowing Tl3+ to form Tl(OH)3 precipitates, filtering to remove thallium in source water. The invention can adjust the pH value of the source water to an appropriate alkaline range, and promote the conversion of Tl+ to Tl3+, and the thallium removal rate is significantly increased; only oxidant addition is required at the front end of the water treatment process; the investment of capital construction is saved, and no addition of special equipment or structures is required.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for removing thallium pollution in drinking water source water. Background technique [0002] Thallium is a highly toxic element, its toxicity is greater than mercury, cadmium, lead and other heavy metals, second only to methylmercury. After thallium enters the water environment, it can enter the human body through drinking water and the food chain. After entering the blood, it is distributed in the tissues and organs of the whole body. Thallium and its compounds have been included in the blacklist of water priority pollutants and the monitoring index system of my country's surface water environmental quality standards (GB3838-2002) and drinking water hygiene standards (GB5749-2006). The standard limit is 0.1μg / L. In recent years, due to the dripping of thallium-containing mineral resources and their tailings in the process of development and utilization, the di...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/72C02F1/52C02F101/20
Inventor 盛德洋巢猛胡小芳许欢陈贻球陈明余素华
Owner 东莞市水务集团供水有限公司
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