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Method for purifying tetravalent selenium-containing sewage under anaerobic condition and aerobic condition by utilizing Citrobacter freundii

A technology of citric acid bacteria and sodium citrate, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of low treatment cost, simple process and large treatment range

Inactive Publication Date: 2015-03-04
XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, there is no report on the use of selenite-reducing bacteria that can grow under both anaerobic and aerobic conditions to remove tetravalent selenium in sewage.

Method used

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  • Method for purifying tetravalent selenium-containing sewage under anaerobic condition and aerobic condition by utilizing Citrobacter freundii

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Experimental program
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Embodiment Construction

[0013] Below is the specific embodiment of Citrobacter freundii, StrainY9 purifying wastewater containing tetravalent selenium under anaerobic and aerobic conditions:

[0014]

[0015] As can be seen from the table: each embodiment batching and can reach removing tetravalent selenium by described method, by the reduction of Citrobacter freundii, StrainY9 tetravalent selenium is reduced into element selenium, to reach in anaerobic and The purpose of removing tetravalent selenium in sewage under aerobic conditions. Embodiments of the present invention can be practiced, but are not limited to these embodiments.

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Abstract

The invention relates to a method for purifying tetravalent selenium-containing sewage under an anaerobic condition and an aerobic condition by utilizing citrobacter freundii. According to the method, the Citrobacter freundii Strain Y9, bought from America Type Culture Collection, is taken as a strain, the citrobacter freundii is inoculated in the tetravalent selenium-containing sewage under the anaerobic condition and the aerobic condition and takes sodium citrate, sodium acetate or sodium nitrate as an electron donor, tetravalent selenium in the wastewater is taken as an electron acceptor, and the tetravalent selenium is reduced into element selenium by the Citrobacter freundii Strain Y9 after a biochemical treatment, so that the aim of removing the tetravalent selenium from the sewage under the anaerobic condition and the aerobic condition is realized. The method is simple in process, convenient to operate, low in treatment cost, large in treatment range and free of secondary pollution.

Description

technical field [0001] The invention relates to a method for purifying sewage containing tetravalent selenium by using Citrobacter freundii, StrainY9 under anaerobic and aerobic conditions, and belongs to the technical field of environmental protection sewage purification treatment. Background technique [0002] Selenium is a non-metallic element located in group VIA of the fourth period of the periodic table. Although selenium is relatively deficient in most areas of China, selenium resources are abundant in some areas. For example, there are rare independent selenium deposits in the world in Enshi, Hubei. Selenium is widely used in industry and agriculture. Selenium is widely used in the electronics industry to produce electronic products due to its good semiconductor properties and electrical conductivity, and selenium is also used in the rubber industry, glass and ceramics industries. In agriculture, selenium can also be used to make pesticides and so on. [0003] Al...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/30
Inventor 潘响亮王潇男高磊
Owner XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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