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Method for treating water body with arsenic pollution

A technology for arsenic pollution and water body, applied in the field of environmental engineering, can solve problems such as difficulty in effect, difficulty in waste treatment, eutrophication of water body, etc., and achieves the effect of simple and easy method, obvious effect of arsenic removal, and easy access to soil

Inactive Publication Date: 2009-10-21
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA +2
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AI Technical Summary

Problems solved by technology

[0003] The current treatment methods for arsenic pollution in water mainly fall into three categories: (1) Physical methods: water transfer and dilution, but this method is a serious waste of water resources and will affect the quality of the downstream water environment
(2) Biological method: planting arsenic-rich aquatic organisms in polluted water bodies, but this method is slow, difficult to achieve results, and may cause eutrophication of water bodies; (3) Chemical methods: such as iron-aluminum activation adsorption method, ion exchange Resin method, etc., but this method is difficult to be applied in large-scale water treatment because it often requires special equipment, or there are problems such as low efficiency or difficult waste disposal.

Method used

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  • Method for treating water body with arsenic pollution

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Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Adsorption rate (adsorption kinetics).

[0027] After the soil is sprinkled into the water body, a dispersed mud layer is formed in the water. The space occupied by the mud layer during the sinking process is about 50cm. According to this calculation, the mud layer gradually moves down to the bottom of the water for about 20m. It takes 4 minutes, that is, the contact time of the soil with the water body during the sinking process is about 4 minutes. Carry out laboratory test according to this condition, the result is as follows:

[0028] Example 1: Add 1.0% (g / mL) φ0.045mm (300 mesh) Yunnan red soil 1 (9.2% iron content, pH 5.4, clay content 42%) to 1000mL surface water containing arsenic 3.47mg / L, After shaking for 5 minutes and filtering, the arsenic content in the clear liquid was 0.0614mg / L, and the adsorption rate reached 82.3%.

[0029] Example 2: Add 0.03% (w / v) φ0.076mm (200 mesh) Yunnan red soil 2 (iron content 10.8%, pH 5.3, clay content 45% to 10...

Embodiment 2

[0031] Example 2: Adsorption Capacity (Adsorption Thermodynamics)

[0032] In polluted water bodies, arsenic is evenly distributed in the water body. In the process of purifying water bodies with soil, not only the soil particles are required to have a faster adsorption rate, but also the soil is required to have sufficient adsorption capacity to improve the arsenic fixation capacity as much as possible. . To this end, the following two sets of adsorption capacity tests were designed.

[0033] Example 1: 100mL 2.0mg / L arsenic-containing aqueous solution, add 0.03% (g / mL) φ0.076mm (200 mesh) red soil 2 (10.8% iron content, pH 5.3, clay content 45%), shake After 2 hours of filtration, the amount of arsenic in the clear liquid was 1.59 mg / L, the adsorption rate was 20.8%, and the adsorption capacity of the soil was 1386 mg / kg, that is, 1386 mg of arsenic could be adsorbed per kilogram of soil.

[0034] Example 2: Add 2.0% (w / v) φ0.1mm (150 mesh) red soil 1 (9.2% iron content, p...

Embodiment 3

[0036] Embodiment 3: Security Analysis

[0037] (1) Re-release of arsenic-fixed soil

[0038] Arsenic is a poisonous inorganic element. After settling into the bottom mud, whether it will be released again and cause secondary pollution is an important issue that needs attention. Tests have shown that after nearly two months of treating polluted water with soil, the arsenic content in the treated water has not risen any more, and has a tendency to gradually decrease. This shows that the arsenic deposited in the sediment did not re-release, which is consistent with the low solubility of iron arsenate mentioned above.

[0039] Generally, the forms of arsenic in polluted water are mainly pentavalent arsenic and trivalent arsenic, of which pentavalent arsenic accounts for about 70-80% and trivalent arsenic accounts for 20-30%. Tests have shown that both forms of arsenic have strong adsorption capacity for iron; iron in nature has two forms of trivalent and divalent, and iron in r...

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Abstract

The invention discloses a method or treating surface water body with arsenic pollution, which is characterized in that soil is taken as an arsenic-fixing agent which is evenly sprayed on water surface according to the dosage of 200-1000g / m; wherein the nature of the soil is as follows: iron content is greater than or equal to 8%, pH value is 4.5-6.5 and clay content is greater than 40%. The method of the invention is simple and convenient, the soil is accessible, the cost is lower, and the effect of arsenic removal is obvious; the concentration of arsenic in water body accords with surface water environmental quality standard (GB3838-2002) III-grade standard (the concentration of arsenic is less than or equal to 0.05mg / L) after dosing soil two days.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for controlling arsenic-polluted water bodies (including surface water bodies such as rivers and lakes). Background technique [0002] Arsenic is a common pollutant. Arsenic-polluted water is colorless and odorless, but it can have serious harmful effects on human health and ecosystems. For example, chronic arsenic poisoning can cause skin cancer and other serious diseases. At present, with the intensification of mining development in my country, the large increase in coal consumption, and the development of phosphorus chemical production, arsenic pollution has occurred frequently, which has brought serious harm to the environment and health. Therefore, the research and development of arsenic-polluted water treatment technology has very important practical significance for protecting our country's ecological environment and ensuring people's...

Claims

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Application Information

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IPC IPC(8): C02F1/58
Inventor 蔡道基夏峰骆永明石利利周跃光章海波郭敏
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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