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Technical method for purifying and reutilizing jean silkete alkali waste liquid by membrane method

A process method and technology of waste lye, applied in chemical instruments and methods, mercerizing, textile material treatment, etc., can solve problems such as inability to process, achieve the effects of reducing usage, reducing the load of treatment facilities, and enhancing biochemical stability

Inactive Publication Date: 2010-10-06
广州中科建禹环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage is that it cannot handle the colored waste lye produced in the mercerizing process of printing and dyeing fabrics (especially denim fabrics)

Method used

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  • Technical method for purifying and reutilizing jean silkete alkali waste liquid by membrane method
  • Technical method for purifying and reutilizing jean silkete alkali waste liquid by membrane method
  • Technical method for purifying and reutilizing jean silkete alkali waste liquid by membrane method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] according to figure 2 As shown, the present invention collects the high-concentration lye when refueling the rolling tank of soaked denim and the high-concentration waste lye of the spray alkali-absorbing pump tank during the denim mercerizing process, and uses the collected waste lye after mixing The inorganic ceramic ultrafiltration membrane with a filtration accuracy of 0.05 microns is used for filtration to remove fibers, particulate impurities, and most other insoluble substances such as colloids. Collect the filtered waste alkali liquid, then pass the collected waste alkali liquid through high-precision bag filter, pressurize it through a high-pressure pump, enter the special alkali-resistant nanofiltration membrane for separation and purification, and remove dyes, paddles, Small molecular organic matter, other small molecular impurities, and most inorganic salts with divalent or higher valence. The above-mentioned purified alkali is blended with NaOH liquid or ...

Embodiment 2

[0028] according to image 3 As shown, the present invention mixes the waste lye and the high-concentration waste lye of the spray alkali suction pump tank during the denim mercerizing process, and the collected waste lye is used to Frame filter press is filtered, removes other insoluble matter such as fiber, particle impurity and most colloids, collects the clear liquid after filtering, collects the waste lye clear liquid after filtering, adopts the follow-up treatment identical with embodiment 1 again Just the process.

Embodiment 3

[0030] according to Figure 4 As shown, the present invention mixes the spent lye and the high-concentration spent lye of the spray alkali-absorbing pump tank during the denim mercerizing process, and the collected waste lye is filtered Inorganic ceramic microfiltration membrane with a precision of 0.05 microns is used for filtration to remove fibers, particulate impurities, and most other insoluble substances such as colloids. 0-20%, the cut-off molecular weight of 100-1000Da organic roll-type nanofiltration separation membrane to further purify the waste lye, remove dyes, small molecular organics, other small molecular impurities, most of the divalent and divalent lye in the waste lye Inorganic salt above valence, the purified lye is evaporated to reach the NaOH concentration required by the rolling bath on the mercerizing line, and applied to the mercerizing production line.

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Abstract

The invention discloses a technical method for purifying and reutilizing jean silkete alkali waste liquid by a membrane method, which comprises the steps of alkali waste liquid collection, alkali waste liquid pretreatment, alkali waste liquid purification treatment, secondary use of alkali liquid reused to a production line mangle tank after preparation and the like. The purified alkali liquid obtained by the invention has the same quality as commercial alkali. When the purified alkali liquid obtained by the invention is prepared into the concentration required by silkete threads with high-concentration sodium hudroxide to be reused, the effect of the purified alkali liquid obtained by the invention is the same as that of the commercial alkali, so the invention has the advantages that: firstly, a large amount of sodium hydroxide is saved, the production cost is reduced, and each silkete thread can generate the economic benefits near million Yuan per year; secondly, the waste water quantity of high-concentration alkali liquid is reduced, so the addition of acid used for neutralization is reduced, the load of original treatment facilities is reduced, the investment of the waste water facility in the new production line is reduced, and the biochemical stability is enhanced; and thirdly, the production idea of clean production, recycling economy and environment protection is advocated.

Description

technical field [0001] The invention relates to a process method for recovering, purifying and reusing denim mercerizing waste lye, in particular to a process method for purifying and reusing denim mercerizing waste lye by membrane method. Background technique [0002] In the mercerizing process of the textile industry, a large amount of NaOH is used to treat the surface of cotton fabrics. The main process is roughly as follows: first soak the cotton fabrics in 18-25% NaOH solution, and then wash the cotton fabrics with warm water solution. Finally, wash with high temperature hot water. NaOH is contained in the waste water generated during the soaking and cleaning process. [0003] according to figure 1 As shown, in the traditional denim mercerizing waste lye discharge treatment process, all the alkali-containing wastewater generated in the mercerizing process is neutralized with sulfuric acid or hydrochloric acid and then subjected to biochemical treatment and physicochem...

Claims

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Application Information

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IPC IPC(8): C02F9/02D06B7/00C02F1/44
Inventor 臧立新
Owner 广州中科建禹环保有限公司
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