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Method for quickly removing pentavalent antimony pollutant in water by combining sodium sulfite and electrochemistry

A sodium sulfite, electrochemical technology, applied in the field of water treatment, to achieve the effect of reducing the residual concentration and optimizing the removal effect

Inactive Publication Date: 2013-11-27
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

Sodium sulfite is a commonly used reducing agent, but it is difficult to reduce pentavalent antimony pollutants with sodium sulfite alone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the electrochemical reactor, the iron plate is the anode, the steel plate is the cathode, the distance between the iron plate anode and the steel plate cathode is 1 cm, and the ratio of the area of ​​the plate to the volume of water to be treated is 1 / 10 (m 2 / m 3 ). Powered by DC power supply, the current density is 1mA / cm 2 . Formulated with Sb 5+ of water to be treated, where Sb 5+ The concentration is 60μg / L, adjust the pH value of water to 4.5, and add sodium sulfite solution with a total concentration of 1.0mmol / L in the electrochemical reactor. The water to be treated is pumped into the electrochemical reactor, and the reaction treatment time is 20 minutes. Under the above operating conditions, the content of antimony in the treated effluent is 2.3 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, without adding sodium s...

Embodiment 2

[0023] In the electrochemical reactor, the iron plate is the anode, the copper plate is the cathode, the distance between the iron plate anode and the copper plate cathode is 1.5 cm, and the ratio of the area of ​​the plate to the volume of water to be treated is 1 / 5 (m 2 / m 3 ). DC power supply is used for power supply, and the current density is 5A / m 2 . Sb in water to be treated 5+ The concentration is 35μg / L, the pH value of the water is adjusted to 5.6, and the sodium sulfite solution with a total concentration of 0.5mmol / L is added to the electrochemical reactor. The water to be treated is pumped into the electrochemical reactor, and the electrochemical treatment time is 15 minutes. Under the above operating conditions, the concentration of antimony in the treated water is 2 μg / L. Under the above operating conditions, no sodium sulfite solution was added, and the antimony concentration in the treated water was 6 μg / L.

Embodiment 3

[0025] In the electrochemical reactor, the iron plate is the anode, the copper plate is the cathode, the distance between the iron plate anode and the copper plate cathode is 1.5 cm, and the ratio of the area of ​​the plate to the volume of water to be treated is 1 / 5 (m 2 / m 3 ). DC power supply is used for power supply, and the current density is 1A / m 2 . Sb in water to be treated 5+ The concentration is 15μg / L, and the sodium sulfite solution with a total concentration of 0.05mmol / L is added to the electrochemical reactor to adjust the pH value of the water to 6.5. The water to be treated is pumped into the electrochemical reactor, and the electrochemical treatment time is 5 minutes. Under the above operating conditions, the concentration of antimony in the treated effluent was 0.9 μg / L. Under the above operating conditions, no sodium sulfite solution was added, and the concentration of antimony in the treated water was 3.2 μg / L.

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Abstract

The invention belongs to the technical field of water treatment and particularly relates to a method for quickly removing pentavalent antimony pollutant in water by combining sodium sulfite and electrochemistry. The method comprises the following steps: in an electrochemical reactor, an iron plate is taken as the positive pole, and a steel plate is taken as the negative pole; the pH value of to-be-treated water containing pentavalent antimony pollutant is adjusted to be 4 to 8, the water is poured into the electrochemical reactor, and in sodium sulfite with the total concentration of 0.05 to 1.0 mmol / L in the electrochemical reactor, the electric current density is adjusted to 1 to 5 mA / cm<2>, ratio of the polar plate area to the volume of the to-be-treated water is 1 / 10 to 1 / 5m<2> / m<3>, and the polar plate interval is 1 to 2 cm; the electrochemical treatment time is 5 to 20 minutes; a direct current supply is adopted to supply power. Through the electrochemical method provided by the invention, pentavalent antimony pollutant can be removed quickly and effectively.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a sodium sulfite and electrochemical combination method for rapidly removing pentavalent antimony pollutants in water. Background technique [0002] Antimony is a toxic and harmful pollutant in water. The existence forms of antimony in water are trivalent and pentavalent. Trivalent antimony in water is easy to remove, but pentavalent antimony has a large electronegativity and high solubility in water, making it difficult to remove. At present, the methods for removing antimony pollutants in water mainly include adsorption, coagulation precipitation, and ion exchange. The above methods usually have better removal effect on trivalent antimony, but have limited removal ability on pentavalent antimony. [0003] Electrochemical method is an effective water purification technology, which is to purify pollutants through electrochemical reactions in water, through single or com...

Claims

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Application Information

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IPC IPC(8): C02F1/463C02F1/70C02F1/62C02F1/66
Inventor 赵旭曲久辉刘会娟兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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