Method for treating and reclaiming wastewater of polyester piece goods dyeing and finishing

A polyester fabric, dyeing and finishing wastewater technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, flotation water/sewage treatment, etc., can solve the problem of low removal rate, lack, and low recycling rate of dyeing and finishing wastewater and other problems, to achieve the effect of preventing odor and improving the recycling rate

Inactive Publication Date: 2007-09-26
嘉兴市新大众印染有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most flocculants have a low removal rate of CODcr value in dyeing and finishing wastewater (generally only about 40-60%), so the purification treatment of dyeing and finishing wastewater with high concentration, high chroma, and high CODcr value is often not up to the standard. Ideal effect, and the effluent is unstable, so it cannot be used for reuse
[0006] Another reason for the low reuse rate of dyeing and finishing wastewater is that the requirements for water quality in different dyeing and finishing processes are quite different. There is a lack of necessary research on processing procedures without affecting the quality of dyed and finished products

Method used

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  • Method for treating and reclaiming wastewater of polyester piece goods dyeing and finishing
  • Method for treating and reclaiming wastewater of polyester piece goods dyeing and finishing
  • Method for treating and reclaiming wastewater of polyester piece goods dyeing and finishing

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Referring to Figure 1 and Figure 2, polyester fabric dyeing and finishing wastewater enters the high-level adjustment tank, and the pH value is monitored. 2 CL 3 The reagent adjusts the pH value of dyeing and finishing wastewater to less than or equal to 8. The adjusted dyeing and finishing wastewater enters the flocculation sedimentation tank for decolorization and purification, adding a ternary composite inorganic polymer flocculant: Al(III) / Fe(II) / Mg(II) composite inorganic flocculant 100mg / l, natural polymer composite Flocculant: chitosan and acrylamide graft copolymerized chitosan mixture 50mg / l, ternary composite inorganic polymer flocculant is used to remove disperse dyes in dyeing and finishing wastewater, natural polymer composite flocculant is used to remove dyeing and finishing active substances in wastewater. The dyeing and finishing wastewater after decolorization and purification is separated, the separated sludge enters the sludge concentration tank, an...

Embodiment 2

[0027] Referring to Figure 1, Figure 2, and Figure 3, polyester fabric dyeing and finishing wastewater enters the high-level adjustment tank, and the pH value is monitored. 2 CL 3The reagent adjusts the pH value of dyeing and finishing wastewater to less than or equal to 8. The adjusted dyeing and finishing wastewater enters the flocculation sedimentation tank for decolorization and purification, adding a ternary composite inorganic polymer flocculant: Al(III) / Fe(II) / Ca(II) composite inorganic flocculant 120mg / l, natural polymer composite Flocculant: chitosan and dimethyl diallyl ammonium chloride graft copolymerized chitosan mixture 50mg / l, ternary composite inorganic polymer flocculant used to remove disperse dyes in dyeing and finishing wastewater, natural polymer Composite flocculants are used to remove active substances in dyeing and finishing wastewater. The dyeing and finishing wastewater after decolorization and purification is separated, the separated sludge enters ...

Embodiment 3

[0029] Referring to Figure 1, Figure 2, and Figure 3, polyester fabric dyeing and finishing wastewater enters the high-level adjustment tank, and the pH value is monitored. 2 CL 3 The reagent adjusts the pH value of dyeing and finishing wastewater to less than or equal to 8. The adjusted dyeing and finishing wastewater enters the flocculation sedimentation tank for decolorization and purification, adding a ternary composite inorganic polymer flocculant: Al(III) / Mg(II) / Ca(II) composite inorganic flocculant 100mg / l, natural polymer composite Flocculant: chitosan and dihydroxypropyltrimethylammonium chloride chitosan mixture 60mg / l. The ternary composite inorganic polymer flocculant is used to remove disperse dyes in dyeing and finishing wastewater, and the natural polymer composite flocculant is used to remove active substances in dyeing and finishing wastewater. The dyeing and finishing wastewater after decolorization and purification is separated, the separated sludge enters...

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Abstract

The invention discloses a disposing and recycling method of polyester piece goods dyeing and finishing waste water, which comprises the following steps: leading polyester piece goods dyeing and finishing waste water through three-body recombined inorganic macromolecule flocculant and nature macromolecule recombined flocculant; proceeding co-flocculate treatment; combining biological treatment and ozone germicidal treatment through filtering technology; getting intermediate water and clean water; mixing; recycling to polyester piece goods dyeing and finishing course selectively. This method can remove colourity and CODcr value of printing and dyeing wastewater swiftly and does not influence quality of fabric.

Description

technical field [0001] The invention relates to a method for treating and reusing dyeing and finishing wastewater in chemical fiber dyeing and finishing processes, in particular to a method for treating and reusing polyester fabric dyeing and finishing wastewater. Background technique [0002] The textile dyeing and finishing industry is one of the departments that discharge a large amount of industrial wastewater. Our country discharges more than 1.2 billion cubic meters of wastewater every year, ranking among the forefront of industrial wastewater discharge. Moreover, dyeing and finishing wastewater has the characteristics of deep color, difficult decolorization, complex and changeable components, high concentration of organic matter, and high COD value. Often, a dyeing and finishing enterprise pollutes a large area of ​​water. At present, the recycling rate of dyeing and finishing wastewater in our country is very low, and the average recycling rate is lower than 10%. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/24C02F1/52
Inventor 杨其根张明荣范金根陆同庆王祥荣
Owner 嘉兴市新大众印染有限公司
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