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Method for removing pentavalent antimony pollutants in water through manganese ion enhanced electrochemistry

A manganese ion and electrochemical technology, applied in the field of manganese ion-enhanced electrochemical removal of pentavalent antimony pollutants in water, can solve problems such as inapplicability

Active Publication Date: 2015-06-24
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of compound oxidant is not suitable for treating pentavalent antimony pollutants, because pentavalent antimony needs to be reduced to trivalent antimony which is easy to remove
However, whether manganese sulfate or manganese chloride can be combined with an electrochemical process to achieve the reduction of pentavalent antimony to trivalent antimony, while manganese ions are oxidized to manganese dioxide with higher adsorption activity, in the prior art No relevant inspiration given

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In an electrochemical reactor, the iron plate is the anode and the steel plate is the cathode. Powered by DC power supply, the current density is 10mA / cm 2 , the plate area and the volume of water to be treated are 1 / 10m 2 / m 3 , the plate spacing is 1cm. Formulated with Sb 5+ of water to be treated, where Sb 5+ Concentration is 500mg / L, adjust the pH value of water to 5.5, pump the water to be treated into the electrochemical reactor, then add manganese sulfate solution, so that the final concentration of the manganese sulfate solution in the electrochemical reactor is 5.0 mmol / L. The reaction treatment time was 20 minutes. Under the above operating conditions, the content of antimony in the treated effluent is 2.5 μg / L, which is lower than the limit concentration of antimony 5 μg / L stipulated in my country’s “Drinking Water Sanitation Standard” (GB5749-2006). Under the above operating conditions, manganese sulfate solution is not added, and the concentration of...

Embodiment 2

[0020] In an electrochemical reactor, the iron plate is the anode and the steel plate is the cathode. DC power supply is used for power supply, and the current density is 0.5A / m 2 , the plate area and the volume of water to be treated are 1 / 10m 2 / m 3 , the plate spacing is 1cm. The water to be treated is pumped into the electrochemical reactor, and the Sb in the water to be treated 5+ The concentration was 250 μg / L, the pH value of the water was adjusted to 6.5, and manganese chloride solution was added so that the final concentration of the manganese chloride solution in the electrochemical reactor was 0.5 mmol / L. The electrochemical treatment time was 15 minutes. Under the above operating conditions, the concentration of antimony in the treated water is 3.5 μg / L. Under the above operating conditions, no manganese chloride solution was added, and the concentration of antimony in the treated water was 18 μg / L.

Embodiment 3

[0022] In an electrochemical reactor, the iron plate is the anode and the steel plate is the cathode. DC power supply is used for power supply, and the current density is 7A / m 2 , the plate area and the volume of water to be treated are 1 / 5m 2 / m 3 , The distance between the plates is 2cm. Pump the water to be treated into the electrochemical reactor, the Sb in the water to be treated 5+ The concentration was 50 mg / L, the pH value of the water was adjusted to 4, and manganese sulfate solution was added so that the final concentration of the manganese sulfate solution in the electrochemical reactor was 2.0 mmol / L. The electrochemical treatment time was 5 minutes. Under the above operating conditions, the concentration of antimony in the treated effluent was 1.5 μg / L. Under the above operating conditions, manganese sulfate solution is not added, and the concentration of antimony in the treated water is 35 μg / L.

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Abstract

The invention belongs to the technical field of water treatment and in particular relates to a method for removing pentavalent antimony pollutants in water through manganese ion enhanced electrochemistry. The method comprises the following steps: installing an iron plate as an anode and a steel plate as a cathode in an electrochemical reactor; adjusting the pH value of to-be-treated water containing the pentavalent antimony pollutants to 4-8, introducing the to-be-treated water into the electrochemical reactor, adding a manganese sulfate solution or a manganese chloride solution at a concentration of 0.1-5.0mmol / L and adjusting the current density to 0.5-10mA / cm<2>; carrying out electrochemical treatment for 5-20 minutes and supplying power by adopting a direct current electrical source. The pentavalent antimony pollutants can be rapidly and effectively removed by adopting the electrochemical method.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for manganese ion-enhanced electrochemical removal of pentavalent antimony pollutants in water. Background technique [0002] Affected by human activities and natural processes, antimony pollution in water is becoming more and more serious. In polluted water bodies, antimonate mainly exists in two valence states of trivalent and pentavalent, among which the existence of antimony in pentavalent state is more common. At present, the methods for removing antimony pollutants in water mainly include adsorption filtration, coagulation precipitation, and ion exchange. Compared with trivalent antimony, pentavalent antimony has higher electronegativity and higher solubility, and it is difficult to effectively remove it by the above methods. [0003] In recent years, the application of electrochemical methods in water treatment has been paid attention to, esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/463C02F1/467C02F1/46
Inventor 赵旭张家兴曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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