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Method for treating waste water of azo dye

A technology for azo dyes and dye wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve azo dye wastewater with high chroma, complex organic components, dyes Wastewater treatment has not been well resolved and other issues

Inactive Publication Date: 2003-05-07
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Over the years, there have been many studies on the treatment methods of azo dye wastewater. The existing treatment technologies include: flocculation precipitation method, biological treatment method, activated carbon adsorption method, wet oxidation method, photooxidation method, etc.; but because Azo dye wastewater has high chroma and complex organic components, so far the treatment of dye wastewater has not been well resolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: add HCI (hydrochloric acid) in the dye wastewater of reactive brilliant red X-3B (the dye wastewater chromaticity is 800 times), make the pH value of dye wastewater 0.5, then add iron powder in dye wastewater, the addition amount 2 grams of iron powder per liter of waste water, stirring to keep the iron powder in a suspended state; and then photodegrading under ultraviolet light for 30 minutes. Results The decolorization rate reached 98%, the reduction products of azo dyes were degraded, and the treated wastewater reached the national discharge standard.

Embodiment 2

[0012] Embodiment 2: in the dye wastewater of reactive brilliant red X-3B (the dye wastewater chromaticity is 1000 times), add HCI to make the pH value of dye wastewater=2.0, then add iron powder in dye wastewater, iron powder concentration is 4 grams For each liter of waste water, stir to keep the iron powder in a suspended state, and recover the reducing agent (iron) by filtration or electromagnet (when the waste water volume is large, it is best to use electromagnet); and then light it for 140 minutes under ultraviolet light degradation. The results showed that the treated wastewater reached the national discharge standard.

Embodiment 3

[0013] Embodiment 3: in the dye wastewater of reactive black K-BR (the dye wastewater chromaticity is 500 times), add HCI to make the pH value=1.5 of dye wastewater, then add iron powder in dye wastewater, iron powder concentration is 0.5 gram / For each liter of waste water, stir to keep the iron powder in suspension. The dye wastewater was photodegraded under ultraviolet light for 80 minutes while adding iron powder. The results showed that the treated wastewater reached the national discharge standard.

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PUM

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Abstract

A process for treating the sewage containing azo dye includes such steps as regulating pH value to less than 2.5, adding iron powder, stirring for decolouring, and radiating by ultraviolet light for optical degradation. Its advantages are high speed and effect, and no secondary pollution.

Description

technical field [0001] The invention relates to a treatment method for azo dye wastewater. Background technique [0002] Over the years, there have been many studies on the treatment methods of azo dye wastewater. The existing treatment technologies include: flocculation precipitation method, biological treatment method, activated carbon adsorption method, wet oxidation method, photooxidation method, etc.; but because Azo dye wastewater has high chroma and complex organic components. So far, the treatment of dye wastewater has not been well resolved. Contents of the invention [0003] The present invention provides a treatment method for azo dye wastewater aimed at the above problems. The method is economical, convenient and effective for treating azo dye wastewater, and has no secondary pollution. [0004] The technical solution provided by the invention is a treatment method for azo dye wastewater, using iron powder to decolorize azo dye wastewater, and photodegrading t...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 邓南圣邓琳吴峰
Owner WUHAN UNIV
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