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A kind of reactive dyeing wastewater treatment method and concentrated liquid color paste

A reactive dyeing and wastewater treatment technology, which is applied in textile industry wastewater treatment, dyeing method, water/sewage treatment, etc., can solve the problems of decreased activity of dyes, inability to realize resource utilization of dyes, failure to achieve effective separation of dyes and inorganic salts, etc. , to achieve the effect of high economic value

Active Publication Date: 2021-07-09
ZHEJIANG LANYU DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 104609605B discloses a process for membrane separation of printing and dyeing wastewater, but the dye recovered by nanofiltration according to this process is greatly reduced in activity due to hydrolysis and cannot be reused for dyeing textile fabrics; and the conductivity of the effluent obtained through this process is Only one-third of the input, two-thirds of the salt and most of the dyes are left in the nanofiltration concentrate, and the effective separation of dyes and inorganic salts has not been achieved.
[0006] Although the patent CN 105776712A has realized the effective separation of polyvalent salts and monovalent salts, the dyestuff cannot be utilized as a resource because it is decolorized by activated carbon adsorption

Method used

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  • A kind of reactive dyeing wastewater treatment method and concentrated liquid color paste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Objects to be treated: 5 tons of reactive yellow 176 dyeing wastewater with a chroma of 4000, a salt content of 4.5% (NaCl is 3%, Na2SO4 is 1.5%), pH=11, and a temperature of 60°C.

[0061] First, it is filtered through a PP melt-blown filter element with a pore size of 0.2mm, and then softened by domestic 113 resin.

[0062] Add hydrochloric acid to adjust the pH=6, and enter the PRo-CEMÒ NF nanofiltration system with a surface area of ​​5 square meters for desalination, the operating pressure is 5.0Bar, and add pure water in 5 times, 2.5 tons each time. After passing through nanofiltration, circulating liquid and saline liquid are formed.

[0063] The circulating liquid is concentrated by a low-pressure reverse osmosis membrane, and the pressure is 30Bar to obtain 110 kg of concentrated liquid color paste with a concentration of 22.5%; the dye recovery rate is 99.1%; the chloride ion content is 35ppm, the sulfate content is 43ppm, and the calcium ion content is 5ppm a...

Embodiment 2

[0065] The object of the treatment of embodiment one is to change the reactive dyeing waste water of active red 239; Pure water water production rate 80%, other conditions are constant, finally obtain concentration and be 105 kilograms of concentrated liquid color pastes of 19.5%, dyestuff recovery rate 98.8% According to the chloride ion content 58ppm of dyestuff percentage, sulfate radical content 30ppm, calcium ion content 2ppm, magnesium ion content is not detected; Produce about 2.6 tons of high-salt liquid of 8.6% salt content, high-salt liquid chromaticity 78.

Embodiment 3

[0067] The processing object of embodiment one is changed into or active dark blue 203, other conditions are constant, finally obtain concentration and be 85 kilograms of concentrated liquid color pastes of 25.2%, dyestuff recovery rate 99.2%, according to the chloride ion content 44ppm of dyestuff percentage, The sulfate content is 35ppm, the calcium ion content is 8ppm, and the magnesium ion content is 2ppm; about 1.65 tons of high-salt liquid with a salt content of 13.5% is produced, and the color of the high-salt liquid is 90.

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Abstract

The present application discloses a reactive dyeing wastewater treatment method and concentrated liquid color paste. The reactive dyeing wastewater treatment method includes the following steps: nanofiltering the reactive dyeing wastewater to be treated to retain the inactivated hydrolyzate in the reactive dyeing wastewater to form Circulating liquid and salt-containing liquid separated from each other, and the operating pressure during nanofiltration is 2-10 Bar; low-pressure reverse osmosis membrane is used to treat the circulating liquid to obtain a concentrated liquid color paste with a dye concentration of 10-20%, wherein The operating pressure is less than 40Bar; the saline solution is filtered by a high-pressure reverse osmosis membrane to form high-salt solution and pure water separated from each other, wherein the operating pressure is 100-120Bar.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating reactive dyeing waste water and concentrated liquid color paste. Background technique [0002] Dyeing with traditional reactive dyes needs to add a large amount of inorganic salts (sodium chloride or sodium sulfate) to promote dyeing, and commercial reactive dyes themselves also contain a large amount of inorganic salts (sodium chloride, sodium sulfate, calcium chloride and calcium sulfate, etc.), so Dyeing wastewater contains undyed reactive dyes and hydrolyzates and a large amount of inorganic salts. When treating wastewater, decolorization and desalination are required to meet discharge standards. However, the treatment cost of the current dyeing wastewater is high. Although the low-salt and salt-free dyeing process of reactive dyes is becoming more and more mature, the cost of reactive dyes and alternative salts suitable for this process is very hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04D06P1/38C02F101/30C02F103/30
CPCC02F1/42C02F1/441C02F1/442C02F1/66C02F2101/308C02F2103/30D06P1/38
Inventor 郭振荣白燕涛
Owner ZHEJIANG LANYU DIGITAL TECH
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