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Method for treating low concentration cobalt-containing wastewater by ozone dispersion oxidation

An oxidation treatment, low-concentration technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, the complete eradication of pollution sources, etc., and meet the acidity requirements Loose, easy to operate, remarkable effect

Inactive Publication Date: 2009-07-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods only realize the transfer of pollutants, that is, the transfer of heavy metals from the water body to the sludge, but have not completely eradicated the pollution source, and the addition of chemical reagents is easy to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Take 1000ml containing Co 2+ Cobalt-containing wastewater with a concentration of 1.0mg / L, under the stirring condition of 500 rpm, pour ozone gas into the cobalt-containing wastewater at a flow rate of 0.30mg / min to make the water form turbulent flow, and control the reaction temperature to 50°C. After 30 minutes of ozone dispersion oxidation, clarification and filtration, the Co in the clear liquid is measured 2+ The concentration is 0.02mg / L. The precipitate was detected as cobalt hydroxide.

Embodiment 2

[0012] Example 2: Take 1000ml containing Co 2+ The cobalt-containing wastewater with a concentration of 5.0mg / L, under the stirring condition of 800 rpm, pass ozone gas into the cobalt-containing wastewater at a flow rate of 0.30mg / min to make the water form turbulent flow, and control the reaction temperature to 40°C. After 40 minutes of ozone diffusion oxidation, clarification and filtration, the Co in the clear liquid is measured 2+ The concentration is 0.03mg / L. The precipitate was detected as cobalt hydroxide.

Embodiment 3

[0013] Example 3: Take 1000ml containing Co 2+ The cobalt-containing wastewater with a concentration of 50mg / L, under the stirring condition of 600 rpm, pass ozone gas into the cobalt-containing wastewater at a flow rate of 2.0mg / min to make the water form turbulent flow, and control the reaction temperature to 20℃. After 45 minutes of ozone dispersion and oxidation, clarify and filter, and detect Co in the clear liquid 2+ The concentration is 0.03mg / L. The precipitate was detected as cobalt hydroxide.

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PUM

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Abstract

The invention discloses a method for treating low-concentration cobaltic wastewater through dispersion and oxidation of ozone. The method can be used for the water treatment on multiple kinds of cobaltic wastewater and cobaltic domestic wastewater and the reclaiming of cobalt resource in the wastewater. The method comprises a main technical proposal that: the ozone in micron-level bubbles is dispersed in a cobaltic wastewater system; oxidation temperature is controlled between 20 and 90 DEG C; time for oxidation reaction is controlled between 0.5 and 2 hours; and after oxidation reaction is finished, the solution is kept stand and is clarified. The method has loose requirement on acidity of the wastewater system, and can be suitable for neutral or alkali condition or even high-acidity condition. The method for treating the cobaltic wastewater can solve the problem of secondary pollution of a chemical drug and has good treatment effect; the purified water quality can reach the emission standard regulated by the state; simultaneously, reclaimed cobalt compounds can be directly roasted to prepare cobalt oxide powder, and can also be used as a raw material for producing a high-quality cobalt compound product.

Description

Technical field [0001] The invention relates to a method for treating low-concentration cobalt-containing wastewater by ozone dispersion oxidation. Background technique [0002] At present, the main treatment methods for low-concentration cobalt-containing wastewater are: chemical precipitation, ion exchange, adsorption, etc. For example, CN1086366C uses sulfides to precipitate heavy metals and precipitates them in the form of sulfides; CN1724407A uses the characteristics of large specific surface area and strong adsorption capacity of ferric hydroxide colloids to treat heavy metal-containing wastewater by the method of flocculation-adsorption-coprecipitation. These methods only realized the transfer of pollutants, that is, the transfer of heavy metals from the water body to the sludge, but did not achieve the complete eradication of pollution sources, and the addition of chemical reagents is prone to secondary pollution. Summary of the invention [0003] The purpose of the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F1/50C02F101/20
Inventor 田庆华郭学益易宇李治海
Owner CENT SOUTH UNIV
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