Method for treating high-concentration organic arsenic wastewater and recycling arsenic

A technology for wastewater treatment and recovery methods, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as wastewater difficulties and arsenic secondary pollution, and achieve simple and easy control methods and operating costs. Low, avoid the effect of secondary pollution of arsenic

Active Publication Date: 2017-06-27
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0006] One of the purposes of the present invention is to solve the problems of high-concentration organic arsenic wastewater and the possible secondary pollution of arsenic in traditional

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  • Method for treating high-concentration organic arsenic wastewater and recycling arsenic

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Example Embodiment

[0036] Example 1:

[0037] The concentration of p-ASA in the water to be treated is 1 mmol / L. Adjust the pH value of the water to be treated to 3.5, and enter the second-stage oxidation reactor in turn under the action of the pump. In the first-stage oxidation reactor, add potassium permanganate solution under rapid stirring conditions, among which potassium permanganate The molar ratio with organic arsenic is 1:5, and the reaction is 0.5min; then enter the second-stage oxidation reactor, and add manganese chloride solution under rapid stirring conditions. The molar ratio of manganese chloride to potassium permanganate is 1 : 5. Continue the reaction for 30 minutes; the effluent enters the fully mixed flow reactor.

[0038] In the fully mixed flow reactor, the nano-iron oxyhydroxide adsorbent is added under rapid stirring conditions. The molar ratio of the nano-iron oxyhydroxide adsorbent to organic arsenic is 1:10, and the reaction is 10 minutes to complete the adsorption of arse...

Example Embodiment

[0040] Example 2:

[0041] The concentration of p-ASA in the water to be treated is 10 mmol / L. Adjust the pH value of the water to be treated to 4.0, and enter the second-stage oxidation reactor in sequence under the action of the pump. In the first-stage oxidation reactor, add potassium permanganate solution under rapid stirring conditions, among which potassium permanganate The molar ratio to organic arsenic is 5:1, and the reaction is 5 minutes; then enter the second-stage oxidation reactor, and add manganese chloride solution under rapid stirring conditions. The molar ratio of manganese chloride to potassium permanganate is 1: 100, continue the reaction for 120 minutes; the effluent enters the fully mixed flow reactor.

[0042] In the fully mixed flow reactor, the nano-iron oxyhydroxide adsorbent is added under rapid stirring conditions. The molar ratio of nano-iron oxyhydroxide adsorbent to organic arsenic is 10:1, and the reaction is 60min to complete the adsorption of arsen...

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Abstract

The invention aims at solving the difficult problem of high-concentration organic arsenic wastewater treatment and provides an organic arsenic wastewater treatment and arsenic recycling method based on 'conversion of organic arsenic into inorganic arsenic-adsorption of inorganic arsenic-separation and recycling of inorganic arsenic'. Specifically, the method comprises the following steps: converting the organic arsenic into the inorganic arsenic by utilizing a two-stage catalytic chemical oxidation method, then completing the adsorption of the inorganic arsenic in a complete mixing flow reactor by utilizing nano-hydroxy ferric hydroxide, and finally realizing arsenic recycling by utilizing acid dissolution and ion exchange methods. The invention also provides an integrated reactor for realizing the process. The method provided by the invention can be used for treatment and recycling of livestock and poultry breeding wastewater, industrial wastewater and industrial waste liquid which contain high-concentration organic arsenic.

Description

technical field [0001] The invention relates to a method for treating high-concentration organic arsenic wastewater and recycling the arsenic, belonging to the application field of wastewater treatment and recycling. Specifically, the organic arsenic is converted into inorganic arsenic by catalytic chemical oxidation, and then the adsorption of inorganic arsenic is completed in a fully mixed flow reactor using nano-ferric hydroxyhydroxide, and finally the arsenic is recovered by acid dissolution and ion exchange. . The present invention also provides an integrated reactor for realizing the above process. [0002] technical background [0003] Organic arsenic such as p-Arsanilic acid (p-Arsanilic acid, p-aminophenylarsine acid), roxarsone (roxarsone, ROX, 3-nitro-4-hydroxyphenylarsine acid) has the functions of promoting growth, inhibiting parasites, and making wings beautiful. It is widely used in the livestock and poultry breeding industry due to its advantages of improvin...

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Application Information

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IPC IPC(8): C02F9/04B01J20/02B01J20/28B01J20/30B01D71/76C22B30/04C22B7/00C02F101/30
CPCB01D71/76B01J20/0229B01J20/28007C02F1/281C02F1/42C02F1/442C02F1/444C02F1/725C02F9/00C02F2101/103C02F2101/30C02F2201/007C02F2301/08C22B7/006C22B30/04Y02P10/20
Inventor 刘锐平提斯卡·普拉萨·乔希胡承志拉什米·寇朱马百文刘会娟曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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