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Active dyeing wastewater treatment method, concentrated solution color paste and preparation method

A reactive dyeing and wastewater treatment technology, applied in the textile industry wastewater treatment, dyeing method, water/sewage treatment and other directions, can solve the problems of decreased dye activity, no effective separation of dyes and inorganic salts, and inability to realize resource utilization of dyes. , to achieve the effect of high economic value

Active Publication Date: 2021-04-27
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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  • Active dyeing wastewater treatment method, concentrated solution color paste and preparation method

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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 invention discloses an active dyeing wastewater treatment method, a concentrated solution color paste and a preparation method thereof.The active dyeing wastewater treatment method comprises the following steps that subjecting to-be-treated active dyeing wastewater to nanofiltration, so that inactive hydrolysate in the active dyeing wastewater is intercepted to form a circulating solution and a salt-containing solution which are separated from each other, wherein the operation pressure during nanofiltration is 2-10 Bar; concentrating the circulating liquid by adopting a low-pressure reverse osmosis membrane to obtain concentrated liquid color paste of which the dye concentration is 10-20%, wherein the operation pressure is less than 40Bar; and filtering the salt-containing solution by using a high-pressure reverse osmosis membrane to form a high-salt solution and pure water which are separated from each other, wherein the operating pressure is 100-120 Bar.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating reactive dyeing wastewater, a concentrated liquid color paste and a preparation method thereof. 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 suitab...

Claims

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Application Information

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Patent Type & Authority Applications(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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