A kind of microbial catalytic regeneration method of complexed iron

A technology for complexing iron and microorganisms, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation to achieve the effects of expanding the scope and approach of resource utilization, inhibiting pollution, and alleviating serious degradation.

Inactive Publication Date: 2017-06-27
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Description
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AI Technical Summary

Problems solved by technology

Iron oxidizing bacteria such as Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans can convert Fe in acidic environment 2+ into the more active oxidant Fe 3+ , however, the use of iron-oxidizing bacteria to catalyze the oxidation of complexed iron in the form of complexes has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Fe (II) EDTA solution was prepared, the concentration of complexed iron was 0.1mol / L, and the initial pH was 1.5. The Acidithiobacillus ferrooxidans bacterial liquid was inoculated according to the volume ratio of 5%, and the microbial stimulating factor was added according to the following ratio: (NH 4 ) 2 SO 4 0.05g / L, KCl 0.1g / L, KH 2 PO 4 0.19g / L, MgSO 4 ·7H 2 O 0.1kg / L, Ca(NO 3 ) 2 0.005g / L, continuous reaction with air at room temperature, after 48 hours of reaction, more than 92% of Fe(II)EDTA is oxidized and regenerated, and the regenerated complex iron solvent can be directly used as a biogas desulfurizer for recycling.

Embodiment 2

[0020] Prepare sulfosalicylic acid (FD) complexed iron solution, the complexed iron concentration is 0.2mol / L, and the initial pH is 3.0, inoculate the Acidithiobacillus ferrooxidans bacterial liquid according to the volume ratio of 10%, and add microbial stimulating factors according to the following ratio simultaneously: ( NH 4 ) 2 SO 4 8.8g / L, glucose 0.5g / L, KCl 0.3g / L, KH 2 PO 4 0.1g / L, K 2 HPO 4 0.89g / L, MgSO 4 ·7H 2 O0.5kg / L, Ca(NO 3 ) 2 0.01g / L, continuous reaction with air at room temperature, after 35 hours of reaction, more than 95% of Fe(II) FD is oxidized and regenerated, and the regenerated complex iron solvent is directly used as a natural gas desulfurizer for recycling.

Embodiment 3

[0022] Prepare Fe(II)-citric acid solution, the complex iron concentration is 0.15mol / L, (NH 4 ) 2 SO 4 3g / L, KCl 0.2g / L, K 2 HPO 4 0.1g / L, KH 2 PO 4 0.1g / L, MgSO 4 ·7H 2 O0.5kg / L, Ca(NO 3 ) 2 0.02g / L, control the initial pH to 2.5, inoculate the Leptospirillum thermoferrooxidans bacterium solution according to the volume ratio of 10%, insert 100 mesh chalcopyrite ore powder according to the mass ratio of 8%, and cultivate in shake flasks at 30°C. After 5 days, the copper The rate of entry and exit is above 80%. In conventional 9K medium, 100-mesh chalcopyrite ore powder was also inserted according to the mass ratio of 8% as a control. The production of chalcopyrite in the system decreased by 69% compared with 9K medium, and the in-out rate increased by 15%.

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Abstract

The invention relates to a method for microbial catalytic regeneration of complexed iron, which utilizes the catalytic action of microorganisms to accelerate the oxidation regeneration of complexed iron, which can effectively alleviate the pollution caused by bacteria, serious degradation of complexing agents, and difficult regeneration of desulfurization liquid in the prior art. Problems, expand the applicable pH range of complexed iron, strengthen the stability of complexed iron, and can be directly applied to the fields of hydrogen sulfide removal, biohydrometallurgy and other fields.

Description

technical field [0001] A microbial catalytic regeneration method for complex iron. [0002] technical background [0003] Hydrogen sulfide is a highly irritating and corrosive harmful gas, usually in very low concentrations of H 2 S can cause serious harm to human health and the natural environment. With the enhancement of people's awareness of environmental protection and the ideological guidance of energy saving and emission reduction, researchers at home and abroad have conducted a lot of research on the issue of tail gas desulfurization. At present, there are many desulfurization methods reported in the literature, but the traditional desulfurization technologies, whether wet or dry, have disadvantages such as low sulfur capacity, complex desulfurization process, and serious environmental pollution, which need to be further optimized and improved. Complex iron desulfurization technology is a method of wet oxidation removal of sulfide using iron as a catalyst. Its featur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/52B01D53/96
Inventor 王玉建
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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