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Method for removing color degree of dyeing waste water

A technology for printing and dyeing wastewater and chromaticity, which is used in light water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as poor effect, large consumption of coagulant, and large equipment footprint, saving capital construction investment, The effect of fast decolorization and small footprint

Inactive Publication Date: 2005-01-26
TONGJI UNIV
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Problems solved by technology

[0004] 1. Activated carbon adsorption, the process of this method is relatively simple, but the activated carbon needs to be regenerated at high temperature, resulting in high energy consumption and high cost: large equipment and floor space
Frequent backwashing of activated carbon also brings inconvenience to operation, consumes a lot of water, and the discharge of waste liquid is easy to cause secondary pollution
[0005] 2. Coagulation treatment is widely used, but it has the following disadvantages: the equipment occupies a large area, and a large amount of coagulant is required, and the sludge generated after coagulation and settlement will cause secondary pollution
[0006] 3. Using the ozone method, the effect is better, bu

Method used

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  • Method for removing color degree of dyeing waste water
  • Method for removing color degree of dyeing waste water
  • Method for removing color degree of dyeing waste water

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Embodiment Construction

[0017] see figure 1 , first, at room temperature, one of the printing and dyeing wastewater with an original chroma of 1380 and a pH of 4.95 is added to the water storage tank, and then hydrogen peroxide is added, and the amount of hydrogen peroxide is controlled so that it is The concentration reaches 0.001mol / L~0.1mol / L. Then, according to the flow rate displayed on the flowmeter as 0.14L~0.70L / min, the above-mentioned printing and dyeing wastewater containing hydrogen peroxide is pumped into a commercially available 185nm UV lamp (intensity: 1.04×10 -5 einstein / s, voltage 220V, current 0.42A) in the reactor. The next step is to pass through 185nmUV and H 2 o 2 After the reaction, the printing and dyeing wastewater is pumped into the storage tank, and the reaction is continued at a circulation flow rate of 60-120L / h. Finally, the printing and dyeing wastewater after 5, 10, 20, 50, and 120 minutes of circulation treatment are respectively sampled, and the effluent water qu...

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Abstract

The invention discloses a method for removing color degree of dyeing waste water which consists of, first charging hydrogen peroxide solution into printing and dyeing wastewater, then pumping the prepared printing and dyeing wastewater containing hydrogen peroxide solution into the reactor equipped with 185 nmUV lamp, and recirculating by the flow ratio of 60-120L/h, finally sampling color degree and pH of the printing and dyeing wastewater undergone 10-50 minutes of recirculation treatment.

Description

technical field [0001] The invention relates to a process for removing the chroma of printing and dyeing wastewater. Background technique [0002] The discharge of printing and dyeing wastewater is large, and the discharged wastewater occupies about 70-90% of the water volume. Due to the large amount of residual dyes and auxiliaries contained in printing and dyeing wastewater, the wastewater has high chroma. Chromaticity is one of the sensory indicators that the public is prone to have opinions on, and it is difficult to remove. [0003] At present, the following five methods are mainly used to reduce the chroma of printing and dyeing wastewater: [0004] 1. Activated carbon adsorption, this method has a relatively simple process, but activated carbon needs to be regenerated at high temperature, resulting in high energy consumption and high cost: large equipment and floor space. The frequent backwashing of activated carbon also brings inconvenien...

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Application Information

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IPC IPC(8): C02F1/32C02F1/72
Inventor 闻瑞梅邓守权
Owner TONGJI UNIV
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