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Printing and dyeing wastewater decoloring method and system

A printing and dyeing wastewater and decolorization technology, which is applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problem of large dosage of coagulation decolorization method, expensive activated carbon adsorption method, and oxidant dosage of oxidation method Large and other problems, to achieve the effect of reducing treatment facilities, good decolorization effect, and saving operating costs

Active Publication Date: 2010-09-15
GUANGDONG LVYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain problems in the above methods, such as the activated carbon adsorption method is expensive and difficult to regenerate; the coagulation decolorization method requires a large amount of chemicals and low efficiency; the oxidation method uses a large amount of oxidant and relatively high operating costs, etc.

Method used

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  • Printing and dyeing wastewater decoloring method and system
  • Printing and dyeing wastewater decoloring method and system
  • Printing and dyeing wastewater decoloring method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 Shown: the printing and dyeing wastewater with high chroma and high alkalinity (chroma 820, COD=680mg / L, PH≈12.5) in the wastewater regulating tank 1 is lifted and shunted through the lift pump 6, so that 1 / 3 of the wastewater passes through the diverter valve 7 and flow meter 9 enter pipeline mixer 13 again, and the waste water is mixed with the acid added in the acid tank 11 so that the pH is adjusted to about 2 and enters the internal electrolytic processor 2. This part of wastewater is treated in the processor 2 and the decolorized wastewater enters the mixed decolorization tank 3 . 2 / 3 of the untreated water extracted by the waste water lifting pump 6 directly enters the mixing decolorization tank 3 through the diverter valve 8 and the flow meter 10, and the two kinds of water are mixed and fully mixed by the agitator 14, and adjusted by the alkali phase in the alkali mixing tank 12 The pH is kept at 9.0, and the waste water is decolorized. The d...

Embodiment 2

[0038] For the decolorization treatment of medium chroma alkaline printing and dyeing wastewater (such as chroma is 350, COD is 420mg / L, PH=9.0) the treatment method is the same as above, the difference is that the amount of water treated by internal electrolytic decolorization is generally 1 / of the total water amount 5, and at the same time, because the two kinds of waste water will consume alkali when they mix and react in the mixed decolorization, the pH will decrease, because the alkalinity in the waste water is not too strong, so it is necessary to add some alkali from the alkali tank (lime water is also OK). Keep pH ≥ 8.5. After treatment, the chroma was 15, the COD was reduced to 280mg / L, the pH was 9.0, and the removal rates reached 96% and 33% respectively. The amount of water for internal electrolysis treatment can be determined according to water quality conditions such as concentration, chroma, and pH, and the amount of water taken is small. The PH needs to be lo...

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Abstract

The invention belongs to the field of printing and dyeing wastewater treatment, in particular to printing and dyeing wastewater decoloring method and system. The method comprises the following steps of: adjusting one part of printing and dyeing wastewater to have an acidic pH value; then, obtaining a decoloring solution by internal electrolysis treatment; and mixing the decoloring solution as a decoloring agent with residual printing and dyeing wastewater under an alkaline condition to achieve the aims of decoloring and removing partial COD (Chemical Oxygen Demand). The system comprises a wastewater control tank, a lifting pump, an internal electrolysis treatment machine, a sedimentation tank and a mixed decoloring tank, wherein the mixed decoloring tank is arranged between the internal electrolysis treatment machine and the sedimentation tank, the wastewater control tank is connected with the lifting pump which is connected to a combined pump of the internal electrolysis treatment machine by an internal electrolysis branch and connected with the mixed decoloring tank by a mixed decoloring branch, the internal electrolysis branch is connected with an acid-preparing tank and provided with a pipeline mixer for adjusting the pH value of wastewater, and the mixed decoloring tank is connected with an alkali-preparing tank. The method has high treatment efficiency and good decoloring effect, and the system is compact and practical and suitable for mass treatment.

Description

technical field [0001] The invention relates to a decolorization treatment technology for printing and dyeing wastewater, in particular to a decolorization method and system for high-concentration printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater is a kind of industrial wastewater that is difficult to treat. Wastewater contains a large amount of alkali and residual printing and dyeing auxiliaries, with large water volume, large chroma, and high organic pollutants. If it is discharged directly without treatment, it will cause serious pollution to water bodies and the environment. Chromaticity treatment is the biggest technical problem in the process of printing and dyeing wastewater treatment and reuse. At present, the treatment methods of printing and dyeing wastewater are mainly physical and chemical methods. Mainly physical adsorption, coagulation decolorization, chemical oxidation and so on. There are certain problems in the a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14C02F1/66C02F1/70C02F103/30
Inventor 温宝忠黄立新
Owner GUANGDONG LVYUAN ENVIRONMENTAL TECH CO LTD
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