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Method for treating high-concentration alkaline arsenic mining and metallurgy wastewater by coprecipitation-ion exchange compound technology

A technology of ion exchange and composite process, which is applied in the field of sewage treatment, can solve the problems that arsenic-containing mining and metallurgy wastewater cannot be discharged up to the standard, the performance of arsenic removal is easily affected by impurity ions, and secondary pollution of sediments, etc., to achieve environmental benefits and Social benefits, enhanced deep removal effect, and large adsorption capacity

Active Publication Date: 2014-03-12
NANJING UNIV
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  • Abstract
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Problems solved by technology

[0008] The present invention aims at the problems existing in the existing arsenic-containing mining and metallurgy wastewater treatment process: 1) the arsenic-containing mining and metallurgy wastewater treated by precipitation cannot be discharged up to the standard, and the sediment is easy to cause secondary pollution; 2) the traditional resin-based hydrated iron oxide is used The pH range of the equal-depth arsenic removal material is small, and the arsenic removal performance is easily affected by impurity ions. A co-precipitation-ion exchange composite process is provided for treating high-concentration alkaline arsenic-containing mining and metallurgy wastewater. The invention is low-cost Under the premise of the premise, the arsenic content of the treated effluent is stably reduced to below 0.5mg / L, which provides an important guarantee for the advanced treatment and comprehensive utilization of arsenic-containing mining and metallurgy wastewater, so as to achieve the unity of environmental and social benefits

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  • Method for treating high-concentration alkaline arsenic mining and metallurgy wastewater by coprecipitation-ion exchange compound technology
  • Method for treating high-concentration alkaline arsenic mining and metallurgy wastewater by coprecipitation-ion exchange compound technology
  • Method for treating high-concentration alkaline arsenic mining and metallurgy wastewater by coprecipitation-ion exchange compound technology

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Embodiment 1

[0039]In conjunction with the accompanying drawings, a co-precipitation-ion exchange composite process of this embodiment is a method for treating high-concentration alkaline arsenic-containing mining and metallurgy wastewater, which is especially suitable for treating high arsenic-containing concentration, strong alkalinity, and a large number of coexisting ions (such as Ca 2+ , Mg 2+ , SiO 3 2- etc.) arsenic-containing mining and metallurgy wastewater. The steps are:

[0040] (A) Control the flow of high-concentration alkaline arsenic-containing mining and metallurgy wastewater raw water into the pH adjustment pool. In this embodiment, the arsenic content in the arsenic-containing mining and metallurgy wastewater is 15 mg / L. Use a metering pump to add sulfuric acid solution to neutralize the alkalinity of the raw water. The mass percentage concentration of sulfuric acid in the added sulfuric acid solution is 40%, and the dosage of sulfuric acid solution is 5L / m 3 , the ...

Embodiment 2

[0049] The method for treating high-concentration alkaline arsenic-containing mining and metallurgy wastewater by a co-precipitation-ion exchange composite process in this embodiment is basically the same as that in Embodiment 1, except that some parameters have been adjusted, and the same effect can still be achieved. details as follows:

[0050] The mass percent concentration of sulfuric acid in the sulfuric acid solution added in step (A) is 70%, and the dosage of sulfuric acid solution is 10L / m 3 , adjust the pH to 6.

[0051] In the step (B), the stirring speed is 20-100 rpm, and the reaction time of the waste water in the contact reaction tank is 30-90 minutes. The dosage of compound ferric chloride and calcium chloride mixed solution is 20L / m 3 , the mass percentage concentration of ferric chloride in the mixed solution is 10%, the mass percentage concentration of calcium chloride is 0.05%; the dosage of polyacrylamide solution is 10L / m 3 , the mass percent concentra...

Embodiment 3

[0057] The method for treating high-concentration alkaline arsenic-containing mining and metallurgy wastewater by a co-precipitation-ion exchange composite process in this embodiment is basically the same as that in Embodiment 1, except that some parameters have been adjusted, and the same effect can still be achieved. details as follows:

[0058] The mass percent concentration of sulfuric acid in the sulfuric acid solution added in step (A) is 40%, and the dosage of sulfuric acid solution is 5L / m 3 , adjust PH to be 8.

[0059] In step (B), the stirring speed is 20 rpm, and the reaction time of the wastewater in the contact reaction tank is 30 minutes. The dosage of compound ferric chloride and calcium chloride mixed solution is 5L / m 3 , the mass percentage concentration of ferric chloride in the mixed solution is 5%, the mass percentage concentration of calcium chloride is 0.01%; the dosage of polyacrylamide solution is 2L / m 3 , the mass percent concentration of the polya...

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Abstract

The invention discloses a method for treating high-concentration alkaline arsenic mining and metallurgy wastewater by coprecipitation-ion exchange compound technology, belonging to the technical field of wastewater treatment. The method comprises the following steps: (A) controlling the raw water of the arsenic mining and metallurgy wastewater to flow into a pH regulating tank, and regulating the pH of the raw water; (B) adding a mixture of ferric chloride and calcium chloride as well as polyacrylamide to carry out coprecipitation reaction; (C) enabling the coprecipitation reaction mixed liquid obtained in the step (B) to flow into a precipitation tank to undergo solid-liquid separation; (D) passing the supernatant obtained in the step (C) through an adsorption tower filled with nanocomposite materials; (E) stopping adsorption when the arsenate ions adsorbed by the nanocomposite materials reach the breakthrough point, and desorbing and regenerating the nanocomposite materials; (F) concentrating the desorption liquid obtained in the step (E), and then sending the precipitate outwards for incineration or reducing the precipitate for producing pesticides. The method can be used for advanced treatment of the high-concentration alkaline arsenic mining and metallurgy wastewater, and has good treatment effects.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for advanced treatment of high-concentration alkaline arsenic-containing mining and metallurgy wastewater by using a co-precipitation-ion exchange composite process. Background technique [0002] Arsenic-containing mining and metallurgy wastewater is mainly produced in the ion exchange process of metal smelting processes such as tungsten, gold, and copper. Its composition is complex, usually strongly alkaline, and a large amount of silicon, calcium, and magnesium coexist in wastewater. As intake of arsenic can seriously harm the enzymes and nervous system of humans and animals, and even directly cause death, the treatment of arsenic-containing wastewater is a serious problem faced by various countries at home and abroad. [0003] At present, most mining and metallurgy plants discharge the arsenic-containing wastewater produced after precipitation wit...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/12C02F101/20
Inventor 潘丙才姜英男花铭吴边张全兴
Owner NANJING UNIV
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