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Method for treating arsenic-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of easy-to-obtain raw materials and simple operation

Inactive Publication Date: 2012-05-30
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the photocatalytic oxidation method is that after the photocatalyst is added to the treatment system, the catalytic reaction can proceed quickly, and the photocatalyst can be used permanently in theory, but this technology is only for pretreatment of arsenic-containing polluted water, and other technologies are needed to achieve the removal of arsenic the goal of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The crushed 90-mesh magnetite powder was soaked in water with a pH of 9.0 and a temperature of 50°C for 5 days, then separated, dried and activated at 110°C for 1.5 hours to obtain activated magnetite; the obtained activated magnetite was sequentially washed with 0.1 mol / L hydrochloric acid solution for acidification, 2.0mol / L sodium hydroxide for alkali washing, and then soaked in organic amine solution for 20 hours; put 80mg of activated and modified magnetite powder into 800mL of arsenic concentration of 500mg / L wastewater, stirred for 2.5 hours; precipitated and separated, the concentration of arsenic in the effluent was reduced from 500mg / L to 0.2mg / L, and the removal rate of arsenic was as high as 99.9%.

Embodiment 2

[0019] Soak the crushed 70-mesh magnetite powder in water with a pH of 7.5 and a temperature of 60°C for 6 days, then separate, dry and activate at 110°C for 1.5 hours to obtain activated magnetite; Acidification with mol / L hydrochloric acid solution, alkali washing with 2.0mol / L sodium hydroxide, and then immersion in organic amine solution for 18 hours; 80mg of activated and modified magnetite powder was put into 700mL of arsenic concentration of 400mg / L wastewater, stirred for 3 hours; precipitated and separated, the concentration of arsenic in the effluent was reduced from 400mg / L to 0.2mg / L, and the removal rate of arsenic was as high as 99.9%.

Embodiment 3

[0021] Magnetite particles with an average particle size of 5mm were soaked in water with a pH of 9.0 and a temperature of 50°C for 6 days, then separated, dried and activated at 110°C for 1.5 hours to obtain activated magnetite; the obtained activated magnetite was sequentially Acidify with 0.1mol / L hydrochloric acid solution, alkali wash with 2.0mol / L sodium hydroxide, and then soak in organic amine solution for 15 hours; put 70mg of activated and modified magnetite particles into 600mL of arsenic concentration 300mg / L wastewater, stirred for 2.5h; precipitated and separated, the concentration of arsenic in the effluent was reduced from 300mg / L to 0.2mg / L, and the removal rate of arsenic was as high as 99.9%.

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Abstract

The invention discloses a method for treating arsenic-containing wastewater, belonging to the technical field of sewage treatment in environmental protection. The method provided by the invention sequentially comprises the following steps of: (1) immersing crushed magnetite powder of 40-100 meshes or magnetite grains with the grain diameter of 5-7 mm in water with the pH value of 7.5-9.5 at a constant temperature of 50-80 DEG C for 5-7 days, and then separating, and drying and activating the immersed magnetite powder or magnetite grains at a temperature of 110 DEG C for 1.5 hours to obtain activated magnetite; (2) acidifying the activated magnetite by using a hydrochloric acid solution with the concentration of 0.1 mol / L and carrying out alkaline washing on the acidified activated magnetite by using sodium hydroxide with the concentration of 2.0 mol / L, and then immersing the alkaline-washed magnetite into an organic amine solution for 12-24 hours; (3) adding 50-100 mg of the activated and modified magnetite powder into 30-800 mL of the arsenic-containing wastewater and stirring for 2.5-3.5 hours; and (4) depositing the stirred mixed liquid and then separating. According to the method disclosed by the invention, amorphous ferric oxide hydrate is generated by hydrolyzing mineral substances including the magnetite and the like, and the amorphous ferric oxide hydrate is aminated in the organic amine solution to form active sites for adsorbing the arsenic after the acidification and the alkaline washing of the amorphous ferric oxide hydrate; the arsenic is easy to combine with an amino so as to be firmly adsorbed on the surface of the magnetite, and the removing rate of the arsenic in the wastewater reaches up to more than 99.9%; and the adsorbed magnetite can be repeatedly utilized after being acidified.

Description

technical field [0001] The invention relates to a method for removing arsenic-containing heavy metals in industrial wastewater such as pharmaceuticals and chemicals, and belongs to the technical field of sewage treatment in environmental protection. Background technique [0002] Arsenic is a highly toxic substance that is harmful to the human body and the environment. It is a national first-class pollutant, and its maximum allowable emission concentration is 0.5 mg / L. Common sulfide concentrates of copper, lead, zinc, and tin contain a certain amount of arsenic. After smelting, sintering or roasting, most of the sulfur and arsenic are oxidized and volatilized into the gas. After leaching and removing impurities, arsenic-containing Acidic wastewater. At present, the more popular methods for treating arsenic-containing wastewater include: neutralization precipitation method, ion exchange method, membrane separation technology, photocatalytic oxidation method, etc. The neutra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 雷春生雷思宇龙海燕
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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