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A regeneration method of an adsorption medium and a decolorization treatment method of printing and dyeing wastewater

A technology of adsorption medium and treatment method, which is applied in the regeneration of adsorption medium and the decolorization treatment of printing and dyeing wastewater. It can solve the problems of not having long-term use conditions and achieve the effects of regenerable adsorbent, prolonging the service life and reducing the cost of decolorization.

Active Publication Date: 2019-06-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since hydrogen peroxide will oxidize the skeleton of the resin and decompose the functional groups, it is not suitable for long-term use

Method used

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  • A regeneration method of an adsorption medium and a decolorization treatment method of printing and dyeing wastewater
  • A regeneration method of an adsorption medium and a decolorization treatment method of printing and dyeing wastewater
  • A regeneration method of an adsorption medium and a decolorization treatment method of printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1～6

[0032] Add 10mL resin sample into the beaker, then add 50mL advanced oxidation treated water sample, mix evenly, measure the chromaticity of the supernatant after the adsorption reaches equilibrium, the results are shown in Table 1.

[0033] Wherein, resin 1 is a macroporous styrene-based strongly basic anion-exchange resin, resin 2 is a macroporous acrylic-based strongly-basic anion-exchange resin, resin 3 is a gel acrylic-based strongly-basic anion-exchange resin, and resin 4 is a macroporous Weak polarity adsorption resin, resin 5 is macroporous nonpolar adsorption resin.

[0034] Table 1 Resin decolorization effect comparison

[0035]

[0036] It can be seen from Table 1 that when the chroma of the water sample is higher (above 640), the overall adsorption performance of resin 2 is the best; when the chroma of the water sample is lower (below 320), the decolorization effect of resin 4 is more obvious.

Embodiment 1

[0046]Add 100 mL of the mixture of resin 2 and resin 4 into the chromatography column, and the mixing ratio is 1:1. The water sample after advanced oxidation treatment is added, and the flow rate is controlled at 10-20BV / h. The resin was regenerated after every 50-100BV water sample was treated.

[0047] 2BV of mixed solution of NaOH (2% by mass fraction) and NaCl (4% by mass fraction) is used for regeneration, and the flow rate is controlled at 5-20BV / h. After the regeneration is completed, a new water sample is added for the next decolorization and adsorption experiment.

[0048] Table 3 Resin colorimetric adsorption chromatography experimental results (short regeneration cycle)

[0049]

[0050]

[0051] The results in Table 3 show that short-cycle rapid regeneration can greatly prolong the service life of resin decolorization. Compared with Comparative Example 1, the attenuation of resin adsorption capacity has been greatly reduced. However, the adsorption capaci...

Embodiment 2

[0053] Add 100 mL of the mixture of resin 2 and resin 4 into the chromatography column, and the mixing ratio is 1:1. The water sample after advanced oxidation treatment is added, and the flow rate is controlled at 10-20BV / h. Regeneration starts after every 50-100BV of water samples are processed.

[0054] The regeneration uses 2BV of NaOH (2% by mass fraction) and NaCl (4% by mass fraction) mixed solution, and the mixed solution also contains rhamnolipid at a concentration of 200ppm.

[0055] After the regeneration is completed, a new water sample is added for the next decolorization and adsorption experiment.

[0056] Table 4 Experimental results of resin chromaticity adsorption chromatography (short regeneration cycle + cleaning regeneration aid)

[0057]

[0058]

[0059] The results in Table 4 show that short-period rapid regeneration can greatly prolong the service life of resin decolorization. When the rhamnolipid regeneration aid is added to the regeneration sol...

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Abstract

The invention discloses a regeneration method of an adsorption medium and a de-coloring treatment method of printing and dyeing wastewater. The regeneration method comprises: a regeneration solution flows through the adsorption medium; the adsorption medium is ion exchange resin or / and macro-porous adsorption resin; the regeneration solution is prepared from the following components: NaCl with the mass percent of 2 percent to 8 percent, NaOH with the mass percent of 2 percent to 8 percent and rhamnolipid with the concentration of 100ppm to 300ppm. According to the de-coloring treatment method provided by the invention, the adsorption medium is regenerated through adopting the regeneration method. According to the regeneration method of the adsorption medium, provided by the invention, the resin is rapidly regenerated in a short period through adopting the special regeneration solution and the service life of resin de-coloring is greatly prolonged; the wastewater de-coloring efficiency is improved and the operation cost is reduced; after 1500BV wastewater is treated through the resin, the adsorption performance basically has no changes and the de-coloring efficiency can reach 80 percent or above for a long period.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a regeneration method for an adsorption medium and a decolorization treatment method for printing and dyeing wastewater. Background technique [0002] China is the largest printing and dyeing country in the world, and its output of printed and dyed cloth accounts for more than 35% of the world. The printing and dyeing industry is also a major water polluter. Printing and dyeing wastewater contains a large amount of complex components such as dyes, pastes, and surfactants. It has the characteristics of large chroma, high concentration of organic matter, and large changes in water quality and water volume. It is a difficult-to-treat industrial wastewater. [0003] Due to the shortage of water resources, the country has higher and higher requirements for the reuse of printing and dyeing wastewater. It is generally required that the recycling ratio of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/42B01J20/34B01J49/50B01J49/57
CPCB01J20/3475C02F1/285C02F1/42
Inventor 岑海燕高大海何勇
Owner ZHEJIANG UNIV
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