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Printing and dyeing wastewater recovery and disposal method

A treatment method and technology for printing and dyeing wastewater, applied in the directions of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, high investment cost, and low photoelectric conversion efficiency and other issues to achieve the effect of large economic benefits

Inactive Publication Date: 2006-05-03
ZHEJIANG UNIV
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Problems solved by technology

This method has high investment cost, low photoelectric conversion efficiency and high energy consumption.

Method used

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  • Printing and dyeing wastewater recovery and disposal method
  • Printing and dyeing wastewater recovery and disposal method

Examples

Experimental program
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Embodiment Construction

[0035] Implementation Step 1: Pretreatment of Desizing Wastewater

[0036] Take 2L of desizing wastewater (water quality: COD 5000-6500mg / L, pH 12), stir vigorously, slowly add 1:5 sulfuric acid, measure the acidity with a pH meter in real time, and take samples at different pH values ​​to determine COD (filtered through filter paper) , to the end of about pH=2. Reality

[0037] The test results show that: at pH=5.5-4.0, the COD value of the water sample drops sharply from 5000-6500mg / L to 1300-1800mg / L, and the removal rate is about 70%. When pH>5.5, COD drops very little; when pH<4.0, COD is difficult to drop further.

[0038] 1 ton of desizing wastewater is subjected to acid analysis treatment (outlet water quality: COD 1400mg / L, conductivity 6500μs / cm), and then filtered through a honeycomb filter element with a filtration accuracy of 1-10 microns, and installed with a Desal DK roll of GE Company of the United States. Reverse osmosis equipment with a sodium filter membr...

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Abstract

The recycle treatment method for printing and dyeing wastewater aims to providing a system technique to recycle and treat the desizing, base-decrement, dyeing sewage with no effect to dyeing product quality and high yield and low cost, which comprises: taking acid-out pre-treatment to sewage for recycling slurry; then, taking A / O biochemical treatment with dyeing sewage and ozone catalytic advance treatment to recycle more than 60% water. This invention can release greatly water-resource pressure with the facility payback period less than five years.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and resource recycling, and relates to the treatment of sewage discharged from the printing and dyeing industry and the resource recycling of sewage. Background technique [0002] Printing and dyeing wastewater has the characteristics of large water volume, deep color, high alkalinity, and complex components. The wastewater contains dyes, additives, oil agents, acid-base substances, fiber impurities, and inorganic salts. Poor performance, and the composition of pollutants varies greatly with the season, production variety, market demand, and processing technology. [0003] Foreign countries have successively developed technologies such as flocculation, adsorption, chemical oxidation, irradiation, wet oxidation and biological treatment for printing and dyeing wastewater, among which biological method has been widely used as an economical and effective treatment method. At present, th...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F1/66C02F3/30
Inventor 赵伟荣吴忠标
Owner ZHEJIANG UNIV
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