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Treatment method for decolorizing printing and dyeing wastewater

A printing and dyeing wastewater treatment method technology, applied in water/sewage treatment, water/sewage multi-stage treatment, electrochemical water/sewage treatment, etc., can solve the problems of large investment, high operating cost, and general decolorization effect

Inactive Publication Date: 2015-01-28
XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have large investment, high operating cost, and general decolorization effect, and it is difficult to meet the requirements of most printing and dyeing enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After the printing and dyeing wastewater whose chroma is less than 3000 times is filtered through a coarse grid and the pH value is adjusted to 5-6, the wastewater is passed through a sponge filled with a particle size of 1.20-1.45mm and a filling height of 5m at a speed of 6m / h. In the iron filter tower, the filtered water is the decolorized wastewater, which can enter the subsequent treatment process.

Embodiment 2

[0016] Embodiment two: decolorization effect test

[0017] In the static test, the chromaticity of the wastewater is 2800 times, the pH value is 5-6, and 10g / L of sponge iron with a particle size of 1.20-1.45mm is added. After 50 minutes of reaction, the decolorization rate of printing and dyeing wastewater can reach more than 90%. ; In the dynamic operation test, the decolorization rate of more than 94% can be achieved by passing through the filter tower filled with sponge iron with a particle size of 1.20-1.45mm and a filling height of 5m at a filtration rate of 6m / h.

[0018] Sponge iron has a good decolorization effect on acid golden yellow, acid navy blue and bright red dyes, and the decolorization rate is above 90%. It has a poor decolorization effect on fast black dyes, but it can also achieve a decolorization rate of about 80%.

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PUM

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Abstract

The invention relates to a treatment method for decolorizing printing and dyeing wastewater, and belongs to the field of wastewater treatment. The treatment method for decolorizing printing and dyeing wastewater comprises the following steps: filtering the printing and dyeing wastewater through a coarse grid, adjusting the pH value to 5-6, and then delivering the wastewater to a filter tower filled with sponge iron at a certain speed, wherein the filtered effluent is decolorized wastewater for subsequent treatment processes. According to the decolorizing treatment method, the sponge iron serving as a metallic porous filter material has a significant effect on decolorizing treatment of the printing and dyeing wastewater, and the decolorization rate of the printing and dyeing wastewater can reach over 94% under optimal conditions; and the method for decolorizing has the advantages of high efficiency, fastness, convenience in operation, economical efficiency, feasibility and the like, so the method is worthy of further study, popularization and utilization.

Description

technical field [0001] The invention relates to a treatment method for decolorization of printing and dyeing wastewater, belonging to the field of wastewater treatment methods. Background technique [0002] The printing and dyeing industry is a large water consumer, and its wastewater discharge and total pollutants rank second and fourth in the national industrial sector, respectively. It is one of the key polluting industries in my country. Printing and dyeing wastewater has always been the focus and difficulty of wastewater treatment process research due to its large discharge volume and high difficulty in treatment. At the same time, with the rapid development of my country's economy, the shortage of water resources has become a limiting factor restricting the further development of my country's printing and dyeing industry. In order to achieve the sustainable development of the printing and dyeing industry, the recycling of printing and dyeing wastewater has become the ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/463C02F1/46C02F1/467
Inventor 陆强
Owner XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP