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Method for recycling textile, printing and dyeing wastewater

A treatment method and technology for printing and dyeing wastewater, applied in textile industry wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of saving water resources and using good effect

Inactive Publication Date: 2009-08-26
ZHEJIANG MIZUDA PRINTING & DYEING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The COD concentration of the bleaching wastewater produced in the boiling and bleaching section is about 3500, and the chromaticity is 32. Its composition is complex and it is difficult to treat

Method used

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  • Method for recycling textile, printing and dyeing wastewater
  • Method for recycling textile, printing and dyeing wastewater
  • Method for recycling textile, printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1. Reuse treatment of desizing wastewater. Such as figure 1 As shown, the desizing wastewater generated in the desizing section is first filtered through a mechanical filter to remove suspended solids and colloids in the wastewater, and then filtered through a ceramic membrane module to retain most of the pollutants in the wastewater, and then filtered The water is directly reused in the desizing section as desizing water. This process has carried out a large number of experiments on the ceramic membrane module. According to the pore size of the ceramic membrane is 50nm, the mechanical filtration+ceramic membrane filtration treatment method of the present invention can reach the following technical indicators, see Table 1.

[0014] Table 1 Technical indicators of desizing wastewater reuse

[0015] project

CODcr (mg / L)

Removal rate

Chroma (times)

Removal rate

temperature

Desizing wastewater

17500

32

8...

Embodiment 2

[0019] Example 2. Reuse of bleaching wastewater. Such as figure 2 As shown, the bleaching wastewater produced in the boiling and bleaching section is first filtered through a mechanical filter to remove suspended solids and colloids in the wastewater, and then filtered through a ceramic membrane module to retain most of the pollutants in the wastewater, and then filtered. The water is reused in the scouring and bleaching section as scouring water. The mechanical filter adopts a steel filter element, the filter element adopts a stainless steel wire-wound tube, and the filtration accuracy is 0.1mm. The mechanical filter uses a high-pressure pump to feed water, with a head of 80 meters, and automatically backwashes through the pressure difference between the inlet and outlet, and the pressure difference is set at 0.5kgf / cm 2 . The ceramic membrane module adopts the ceramic ultrafiltration membrane produced by Nanjing Jiusi Hi-Tech Co., Ltd., with a pore size of 50nm, and the...

Embodiment 3

[0023] Example 3. Reuse treatment of mercerizing wastewater. Such as image 3 As shown, the mercerizing wastewater produced in the mercerizing section is first filtered through a mechanical filter to remove suspended solids and colloids in the wastewater, and then filtered through a ceramic membrane module to retain most of the pollutants in the wastewater, and then the filtered water It is reused in the cooking and bleaching section as water for boiling and bleaching. The mechanical filter adopts a steel filter element, the filter element adopts a stainless steel wire-wound tube, and the filtration accuracy is 0.1mm. The mechanical filter uses a high-pressure pump to feed water, with a head of 80 meters, and automatically backwashes through the pressure difference between the inlet and outlet, and the pressure difference is set at 0.5kgf / cm 2 . The ceramic membrane module adopts the ceramic ultrafiltration membrane produced by Nanjing Jiusi Hi-Tech Co., Ltd., with a pore ...

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Abstract

The invention discloses a method for recycling textile, printing and dyeing wastewater, comprising the following steps: mercerizing wastewater, bleaching wastewater or desizing wastewater and the like produced in the production processes of textile, printing and dyeing are first subjected to filtering by a mechanical filter to remove suspended matters and colloid in the wastewater and then to filtering by ceramic membranes to intercept most pollutants in the wastewater; then the filtered wastewater meeting the quality requirement of the production technology applied water is recycled. In the invention, mechanical filtering and ceramic membrane filtering are adopted for recycling of the wastewater produced in the production processes of textile, printing and dyeing, thus not only saving the water resources and reducing the enterprise cost, but also ensuring low cost, convenient operation and control and low operating cost.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a recycling treatment method for textile, printing and dyeing wastewater. Background technique [0002] In the production process of textile, printing and dyeing enterprises, a large amount of waste water will be generated. The desizing wastewater produced in the desizing section is the most polluted wastewater in the entire production process, and its COD (chemical oxygen demand) average concentration can reach 17,000-19,000 mg / L. It is difficult to treat it to the discharge standard. The cost is high, but the chromaticity is only about 32, and it can meet the requirements of production water with a little treatment. At the same time, its discharge temperature is high, with an average of about 85°C. It can reach the temperature required by the production process with a little heating. The COD concentration of the bleaching wastewater produced in the boiling and bleaching section...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F103/30
Inventor 许瑞林
Owner ZHEJIANG MIZUDA PRINTING & DYEING GRP
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