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Method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria

An arsenic-polluted, autotrophic technology, applied in the restoration of polluted soil, water pollutants, chemical instruments and methods, etc., can solve the problems of limited arsenic adsorption capacity, unsuitable for large-scale application, difficult to deal with precipitation, etc. The effect of low cost, simple method and easy operation

Active Publication Date: 2020-09-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The adsorption method mainly uses the adsorption material with good adsorption performance to remove and purify arsenic in the water body, but the adsorption capacity of the adsorption material for arsenic is limited, and the adsorption effect of most adsorption materials on As(V) is better than As(III); The ion exchange method mainly uses ion exchangers to achieve the purpose of removing arsenic through ion exchange reactions, but this method is expensive and not suitable for large-scale application; the membrane separation method uses the selective permeability of the membrane to decontaminate arsenic and other targets. However, this method has the problems of high cost and complicated operation, and it is difficult to promote it on a large scale; the iron salt method uses iron ions to form stable arsenate and arsenite substances, so as to achieve the purpose of removing arsenic, but the precipitation produced by this method is difficult to handle, and the adsorption effect on As(V) is better than that of As(III)

Method used

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  • Method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria
  • Method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria
  • Method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria

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Experimental program
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Effect test

Embodiment 1

[0044] According to the ratio of Fe / As atomic mole ratio of 30 (As (III) treatment) and 20 (As (V) treatment), the experiment of treating 50mg / L arsenic-containing wastewater with acidophilic Thiobacillus ferrooxidans was carried out, respectively. ML 2.5×10 6 , 5×10 6 , 7.5×10 6 Add the centrifugal liquid of Thiobacillus ferrooxidans to the arsenic-containing wastewater, adjust the pH to 2.5, and place it in a shaker at 30°C and a rotating speed of 165-175 rpm to react for 3 days. The precipitate and the solution are separated, and the arsenic concentration of the solution is measured by ICP-OES.

[0045] by figure 2 It can be seen that when the dosage of live bacteria increases, the treatment effect of Thiobacillus ferrooxidans on As(III) is significantly improved; when the dosage of live bacteria is 5×10 per ml 6 In the case of two bacteria, after 3 days of reaction, the treatment efficiency of acidophilic Thiobacillus ferrooxidans on the wastewater containing As(III) graduall...

Embodiment 2

[0047] Fe / As molar ratios are 1, 3, 5, 7, 10, 20, 30, 40, and 50 respectively. Add FeSO to 50mg / L arsenic-containing wastewater 4 ·7H 2 O, 2.5×10 per milliliter 6 Add the centrifugal liquid of Thiobacillus ferrooxidans to the arsenic-containing wastewater, adjust the pH to 2.5, and place it in a shaker at 30°C and a rotating speed of 165-175 rpm to react for 3 days. Separate the precipitate and the solution, analyze the phase of the precipitate by X-ray diffractometer, and determine the arsenic concentration of the solution by ICP-OES.

[0048] by image 3 It can be seen that when the Fe / As(III) atomic molar ratio is 30 and above, the XRD spectrum of the resulting material is basically stable and consistent with the standard PDF card of Shi's mineral; Figure 4 It can be seen that when the Fe / As(V) atomic molar ratio is 20 and above, the XRD spectrum of the resulting material is basically stable, which is consistent with the standard PDF card of Shi's minerals.

[0049] by Figure 5...

Embodiment 3

[0052] Add FeSO to 50mg / L wastewater containing As(III) according to the ratio of Fe / As atomic molar ratio of 30 4 ·7H 2 O, 7.5×10 per milliliter 6 Add the centrifugal solution of Thiobacillus ferrooxidans to the arsenic-containing wastewater, adjust the pH to 2.5, and place it in a shaker at 30°C and a rotating speed of 165-175 rpm for 3 days to separate the precipitate and the solution. The solution passes ICP-OES determined that the removal rate of As(III) by Thiobacillus ferrooxidans was 90.22%.

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Abstract

The invention discloses a method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria. According to the method, mineralization and arsenic removal areconducted mainly through the biological mineralization effect of acidithiobacillus ferrooxidans, Fe (II) in wastewater and soil is oxidized into Fe (III) through the acidithiobacillus ferrooxidans, As(III) and As (V) are fixed in the Schwertmannite forming process, and removal and stabilization of arsenic in water and soil can be achieved. The method is simple in steps, short in time and high inefficiency; reaction conditions are mild, the process is controllable, and economy and feasibility are achieved; the application range is wide, and As (III) and As (V) in polluted water and soil can be treated; in addition, the arsenic removal efficiency is high, the stability of the treated arsenic is high, and secondary pollution is avoided.

Description

Technical field [0001] The invention belongs to the technical field of water treatment and soil restoration, and specifically relates to a method for treating arsenic-containing wastewater or arsenic-contaminated soil by using acidophilic Thiobacillus ferrooxidans. Background technique [0002] With the continuous development of mining, beneficiation, smelting and other industries, as well as the continuous use of various arsenic-containing materials, arsenic pollution in soil and natural waters has become increasingly serious, which not only endangers ecological safety, but also has a serious impact on people's health. Seeking a way to effectively degrade arsenic in water and soil has become the focus of increasing attention. [0003] At present, the main technologies for treating arsenic-containing wastewater include chemical adsorption, ion exchange, membrane separation, and iron salt method. The adsorption method mainly uses adsorption materials with good adsorption performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34B09C1/10C02F101/10
CPCB09C1/10C02F3/34C02F3/346C02F2101/103
Inventor 杨卫春赵洁杨志辉张晓明姜智廖骐石岩李青竹
Owner CENT SOUTH UNIV
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