Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge

A glow discharge and water treatment device technology, which is applied in the field of environmental sewage treatment, can solve problems that have not received full attention from everyone, and achieve the effect of efficient removal

Active Publication Date: 2014-06-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of this technology to the treatment

Method used

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  • Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge
  • Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge
  • Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge

Examples

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Embodiment 1

[0029] A treatment method for efficiently and rapidly oxidizing and fixing arsenic in waste water by using glow discharge, comprising the following steps:

[0030] (1) Adjust the pH value of the wastewater solution containing As (III) to be treated to 3 and the conductivity value to 6 mS / cm, and adjust the concentration of Fe(II) in the wastewater solution so that Fe(II) / As( III) the molar ratio is 2, and it is imported into the electrode glow discharge water treatment device;

[0031] (2) The glow discharge reactor described as figure 1 As shown, 4 needle electrodes are used as stainless steel anodes, and the cathode is a carbon rod electrode, which is isolated from the solution through a glass tube with a sealed sand core at the bottom. When discharging, each needle electrode is in contact with the liquid surface. The normal working DC voltage is 480V, the current is 80mA, the discharge is in the atmosphere, and the stirring rate is 2 revolutions / s; after the discharge trea...

Embodiment 2

[0033] A treatment method for efficiently and rapidly oxidizing and fixing arsenic in waste water by using glow discharge, comprising the following steps:

[0034] (1) Adjust the pH value of the wastewater solution containing As (III) to be treated to 6 and the conductivity value to 1 mS / cm, and adjust the concentration of Fe(II) in the wastewater solution so that Fe(II) / As( III) the molar ratio is 4, which is imported into the electrode glow discharge water treatment device;

[0035] (2) In the glow discharge reactor, two needle electrodes are used as stainless steel anodes, and the cathode is a carbon rod electrode, which is isolated from the solution through a glass tube with a sand core sealed at the bottom. When discharging, each needle electrode is connected to the liquid surface In contact with each other, the normal working DC voltage is 1000V, the current is 500mA, the discharge is in the atmosphere, and the stirring rate is 2 revolutions / s; after the discharge treatm...

Embodiment 3

[0037] Such as figure 1 with figure 2 As shown, an electrode glow discharge water treatment device includes a carbon rod cathode (1), a stainless steel anode (2), a glass reactor (3), a glass tube (4), the carbon rod cathode (1) and a glass The tubes (4) are respectively arranged on the upper cover of the glass reactor (3); the outer periphery of the glass reactor (3) is provided with a cold hydrazine interlayer (6), and the cold hydrazine interlayer (6) is respectively provided with a cooling inlet A water port (7) and a cooling water outlet (8); the bottom of the glass tube (4) is sealed with a quartz sand core, and the stainless steel anode (2) is placed in the glass tube (4).

[0038] Prepare the solution to be treated: 250mL of mixed solution with As(III) concentration of 0.8mM and Fe(II) concentration of 1.6mM, use sodium sulfate to adjust the conductivity of the solution to about 3.0mS / cm, and use sulfuric acid to adjust the pH value to 3 , 4, 5, and 6 four kinds of so...

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Abstract

The invention relates to the field of environment wastewater disposal, and particularly relates to a method and a device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge. According to the method and based on the device, plasma technology is applied to a system for disposing wastewater containing As (III), As (V), Fe (III), and Fe(II) ions from metallurgy, mining and the like, As (III) is converted into less-toxic As (V), and Fe (II) in the solution is oxidized into Fe (III) by using a glow discharge system, and simultaneously the hard-soluble amorphous compound precipitate ferric arsenate can be quickly produced at an appropriate pH and within the range of better arsenic-iron mole ratio in the glow discharge plasma system, thereby achieving the purpose of high-efficiency removal of arsenic.

Description

technical field [0001] The invention relates to the field of environmental sewage treatment, in particular to a method and a device for efficiently and rapidly oxidizing and fixing arsenic in waste water by using glow discharge. Background technique [0002] Arsenic (As) is an element widely distributed in the earth's crust and is recognized as a toxic carcinogen. As compounds have trivalent and pentavalent forms, and As(III) is more toxic and mobile. Studies have shown that with AsO 3 3- The ratio of As(III) present to AsO 4 3- The presence of As(V) is 60 times more toxic. While arsenic compounds are widely used in production fields such as mining, smelting, glass manufacturing, pesticides and wood preservatives, a considerable amount of arsenic compounds enters the environment and exists in water, soil, plants, animals, marine organisms and humans, and forms a cycle between the various arsenic compounds. [0003] According to the research of the World Health Organiz...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/72C02F1/64
Inventor 郑经堂江波郭建波谭明慧吴明铂吴文婷薛庆忠胡平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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