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Method for removing trace arsenic from aqueous solution

An aqueous solution and removal technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of a large amount of waste residue and unsatisfactory removal effect, and achieve a small amount of waste residue, Reagent consumption is less, the effect of improving the removal rate

Inactive Publication Date: 2012-07-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of removing arsenic is suitable for treating waste liquid with high arsenic content, but the removal effect is not ideal for waste liquid with low arsenic content, and a large amount of waste residue is produced, and it may also introduce undesirable ion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Measure 1L of an aqueous solution with an arsenic (pentavalent) content of 16.9 mg / L, add 2 mg of sodium carbonate, 0.5 g of anhydrous calcium chloride, and 5 mg of magnesium nitrate hexahydrate, and control the temperature of the aqueous solution to 25°C. Under the conditions of vigorous stirring and controlling the pH of the system to 4-5 (adjust with sodium hydroxide or hydrochloric acid if necessary), add 1.0 g of ferric chloride hexahydrate. After the dropwise addition was complete, stirring was continued for 1 hour. Thereafter, it was cooled to room temperature, allowed to stand, settled and filtered to remove arsenic-containing precipitates. The arsenic content of the filtrate was analyzed by ICP (Inductively Coupled Plasma Emission Spectroscopy, the same below) to be less than 0.01mg / L.

Embodiment 2

[0016] Example 2: Take 1L of an aqueous solution with an arsenic (pentavalent) content of 16.9 mg / L, add 0.12 g of sodium bicarbonate, 50 mg of calcium nitrate tetrahydrate, and 0.6 g of magnesium chloride hexahydrate, and control the temperature of the aqueous solution to 15°C. Under the conditions of vigorous stirring and controlling the pH of the system to 5-6 (adjust with sodium hydroxide or hydrochloric acid if necessary), add 20 mg of copper nitrate. After the dropwise addition was complete, stirring was continued for 1 hour. Afterwards, cool to room temperature, let stand, settle and centrifuge to remove arsenic-containing precipitates. The arsenic content of the filtrate was less than 0.01mg / L by ICP analysis.

Embodiment 3

[0017] Example 3: Measure 1 L of an aqueous solution with an arsenic content of 16.9 mg / L, add 0.1 g of magnesium chloride, and add 0.5 g of sodium bicarbonate to adjust the pH of the solution to 4-5. Under vigorous stirring, 50 mg copper sulfate pentahydrate and 150 mg ferrous sulfate heptahydrate were added, and stirring was continued for 1 hour. Afterwards, let stand, settle and centrifuge to remove the arsenic-containing precipitate. The arsenic content of the filtrate was less than 0.01mg / L by ICP analysis.

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Abstract

The invention discloses a method for removing trace arsenic from an aqueous solution. The method comprises the steps of: adjusting the pH value of an arsenic-containing aqueous solution with an acid or a base by utilizing the adsorption and coprecipitation principle through culturing and analyzing the plants growing in arsenic environment, adding a copper-containing reagent, an iron-containing reagent or a zinc-containing reagent or simultaneously or respectively adding a mixture of two or more of the copper-containing reagent, the iron-containing reagent and the zinc-containing reagent in the presence of calcium salts, magnesium salts and carbonate, and precipitating, wherein the arsenic content in the water, from which arsenic containing slag is separated, is detected to be less than 0.01mg / L. The method has the characteristics that the trace arsenic element in the aqueous solution can be removed by controlling the addition amounts of the copper-containing reagent, the iron-containing reagent and the zinc-containing reagent as well as the pH value of the solution; the use raw materials are economical and easily available, and harmful elements are not introduced to the system, thus the method is an environment-friendly and economical treatment process; and the process can be widely applied to treatment of arsenic-containing wastewater discharged in the fields of metallurgy, chemical industry, pesticide, pigment, fuel, papermaking, leather manufacture and the like.

Description

【Technical field】 [0001] The invention relates to the wastewater treatment field of environmental technology, in particular to a method for removing trace arsenic in aqueous solution. 【Background technique】 [0002] With the rapid increase of industrial waste, the heavy metal arsenic pollution in water is becoming more and more serious. Arsenic is often found in industrial wastewater, and the largest sources of arsenic pollution come from industries such as metallurgy, chemical industry, pesticides, pigments, fuels, papermaking, and tanning. These industrial effluents often contain a considerable amount of toxic arsenic compounds. [0003] The traditional method of removing arsenic is suitable for treating waste liquid with high arsenic content, but the removal effect is not ideal for waste liquid with low arsenic content, and a large amount of waste residue is produced, and it may also introduce undesirable ion. 【Content of invention】 [0004] The object of the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F9/04
Inventor 孙波牛力华张立兵安钢吴新世
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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