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Gradual treatment and recovery method for secondary treatment effluent of printing and dyeing wastewater

A technology for secondary treatment of effluent and printing and dyeing wastewater, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problem that the secondary effluent treatment effect is not ideal Cooperate with other issues to achieve the effect of low waste water treatment cost, economical reuse and pollution reduction

Active Publication Date: 2015-04-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the existence of the secondary effluent treatment and reuse process of the existing printing and dyeing wastewater: 1) It cannot be well matched with the characteristic that different production processes of the printing and dyeing process have different water quality requirements, so as to realize the economic reuse of the secondary effluent of printing and dyeing; 2) For the unsatisfactory treatment effect of the secondary effluent, a cascade treatment and reuse method for the effluent of the secondary treatment of printing and dyeing wastewater is provided; the invention reasonably integrates the ion exchange technology and the membrane filtration technology, effectively reduces the The pollution of the permeable membrane can be eliminated, and the chroma and salt of the secondary effluent can be appropriately removed according to the different requirements of the different production processes of the printing and dyeing process on the reused water quality, realizing the economical reuse of the effluent from the secondary treatment of printing and dyeing

Method used

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  • Gradual treatment and recovery method for secondary treatment effluent of printing and dyeing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In conjunction with the accompanying drawings, the specific steps of the stepwise treatment and reuse method of the secondary treatment effluent of printing and dyeing wastewater in this embodiment are as follows:

[0033](1) Fill 8mL mixed ion exchange resin in a glass adsorption column with a diameter of 1cm and a height of 20cm (the effect is the same as that of a fixed bed reactor), of which 1.6mL is macroporous strong acid styrene-based cation exchange resin D001, functional group The group is a sulfonic acid group (-SO 3 H); 6.4mL is a macroporous strong base type acrylic anion exchange resin D213, the two resins are evenly mixed, and the particle size is between 0.5-1.00mm. Pass the secondary effluent of the printing and dyeing wastewater whose water quality is shown in Table 1 through the ion exchange column (namely the glass adsorption column) for exchange reaction, and the flow rate of the secondary effluent is 10BV / h. When the ion exchange column outlet Ca ...

Embodiment 2

[0044] The cascade treatment and reuse method of the effluent from the secondary treatment of printing and dyeing wastewater in this example is basically the same as in Example 1, except that the granular macroporous strong-acid styrene-based cation exchange resin D001 and large Porous strong base type acrylic anion exchange resin D213 was replaced by microspherical macroporous weak acid type acrylic type cation exchange resin D113 and macroporous strong base type acrylic anion exchange resin D213 with a particle size of 80-100 μm, macroporous strong base type The volume ratio of the acrylic anion exchange resin and the macroporous weak acid type acrylic cation exchange resin is 3:1; the two resins are evenly mixed. The reactor was changed to a fully mixed reactor, the stirring speed in the fully mixed reactor was 150rpm, and the reaction time was 30min. 2+ The concentration is 1.5mg / L, the DOC is 6.2mg / L, and the SDI value is 0.52; the ultrafiltration effluent is filtered wit...

Embodiment 3

[0046] The cascade treatment and reuse method of the secondary treatment effluent of printing and dyeing wastewater in this embodiment is basically the same as in embodiment 1, the difference is that in this embodiment, the mixed ion exchange resin is a macroporous strong alkali type with a volume ratio of 5:1 Acrylic anion exchange resin D213 and macroporous weak acid type acrylic cation exchange resin D113, the two resins are uniformly mixed, and the particle size is between 0.8-1.25mm, the flow rate of the secondary outlet water is 2BV / h, the added inorganic The flocculant is polyaluminum chloride, and the concentration of polyaluminum chloride in the effluent is 10mg / L. In the ultrafiltration treatment, the polyethersulfone membrane with a cut molecular weight of 50kDa is used for the ultrafiltration membrane, and the mass percentage concentration of the desorption solution is 10%. of NaCl solution. The secondary effluent of the printing and dyeing wastewater in this embod...

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Abstract

The invention discloses a gradual treatment and recovery method for secondary treatment effluent of printing and dyeing wastewater, and relates to the technical field of treatment of the printing and dyeing wastewater. The method comprises the following steps: (1) introducing secondary effluent into a reactor filled with mixed ion exchange resin; (2) adding an inorganic flocculating agent into the effluent treated in the step (1), stirring and performing ultrafiltration treatment, wherein water produced after the ultrafiltration treatment is taken as water for use in a general rinsing procedure in a printing and dyeing process; (3) supplying the water produced after the ultrafiltration treatment in the step (2) to a reverse osmosis system for further treatment, wherein water produced after the reverse osmosis treatment is taken as water for use in a burdening or dyeing procedure in the printing and dyeing process; (4) after finishing the treatment in the step (1), performing desorption regeneration on the mixed ion exchange resin, wherein the resin subjected to desorption regeneration is applicable for circular use. The secondary effluent can be gradually treated in an appropriate way according to different requirements of printing and dyeing production procedures on the water quality to obtain effluent of different water qualities, thereby realizing economic recovery of secondary effluent.

Description

technical field [0001] The present invention relates to the advanced treatment and reuse process of secondary effluent, and more specifically, to a method for stepwise advanced treatment and reuse of printing and dyeing wastewater secondary treatment effluent according to different reuse targets. Background technique [0002] The printing and dyeing industry is a large water consumer. With the rapid development of my country's economy, the shortage of water resources has become a limiting factor restricting the further development of my country's printing and dyeing industry. In order to achieve the sustainable development of the printing and dyeing industry, the reuse of printing and dyeing wastewater has become the key to achieve this goal. Printing and dyeing wastewater is generally treated by physicochemical + biological secondary processes. The COD of the effluent is basically around 100mg / L, with deep chroma and high salt content, which cannot meet the standards for or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 龙超杨成谢思源蒋海涛王爽爽贾李娟李爱民
Owner NANJING UNIV
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