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Method for processing and separate-recycling printing and dyeing wastewater

A printing and dyeing wastewater, quality separation and reuse technology, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of shortening the service life of treatment equipment and increasing equipment operation and maintenance cost and other issues, to achieve the effect of easy large-scale industrial application, efficient treatment and reuse, and prolonging the service life

Inactive Publication Date: 2008-10-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technology can improve the regeneration rate of wastewater, since the wastewater is basically all treated by microfiltration and most of it is treated by nanofiltration membrane treatment system, it is easy to shorten the service life of the treatment equipment and increase the cost of equipment operation and maintenance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The printing and dyeing wastewater with a concentration of 3500mg / L is introduced into the regulating tank, the pH value of the wastewater is adjusted to 6.0-7.0, the residence time is 4h, and then ammonium chloride with an ammonia nitrogen concentration of 150mg / L is added to the wastewater, and the phosphate concentration is 30mg / L disodium hydrogen phosphate, CoCl with a trace element (Co, Mn, Zn, Ni, Mo) concentration of 40-60μg / L 2 ·6H 2 O, MnCl 2 4H 2 O, ZnCl 2 、NiCl 2 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24Then enter the UASB reactor for treatment. The UASB reactor uses anaerobic granular sludge, adjust the pH value to 6.5-7.0, and the residence time is 16-18h, and then enter the anoxic reactor to adjust the pH value to 6.5-7.0. The anoxic reactor uses ceramsite filler, the filling ratio is 40%, the reflux ratio of the effluent from the aerobic reactor to the anoxic reactor is 2, the residence time is 6h, the gas-water ratio is 3:1, and then enters the aerobic reac...

Embodiment 2

[0030] Introduce printing and dyeing wastewater with a concentration of 5000mg / L into the regulating tank, adjust the pH value of the wastewater to 8.0-9.0, and the residence time is 6h, then add ammonium sulfate with an ammonia nitrogen concentration of 250mg / L and a phosphate concentration of 50mg / L to the wastewater Dipotassium hydrogen phosphate, 60-80μg / L trace element compound CoCl 2 ·6H 2 O, MnCl 2 4H 2 O, ZnCl 2 、NiCl 2 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 Then enter the IC reactor for treatment. IC is composed of two UASB reactors. The bottom is under high load and the top is under low load. The pH value is 7.5-8.0, the residence time is 18-20h, and then the wastewater is introduced into the anoxic reactor to adjust the pH value to 7.0-7.5. The anoxic reactor uses ceramsite filler, and the filling ratio is 50%. The aerobic reactor The reflux ratio of the effluent back to the anoxic reactor is 4, the residence time is 8h, and the gas-water ratio is 4: 1, then enters ...

Embodiment 3

[0032] The printing and dyeing wastewater is introduced into the regulating tank, the concentration of the wastewater is 1800mg / L, the pH value of the wastewater is adjusted to 7.0-8.0, and the residence time is 8h, then ammonium chloride with an ammonia nitrogen concentration of 90mg / L is added to the wastewater, and the phosphate concentration is 18mg / L sodium phosphate, 1~20μg / L trace element compound CoCl 2 ·6H 2 O, MnCl 2 4H 2 O, ZnCl 2 、NiCl 2 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 Then enter the EGSB reactor for treatment, the liquid ascending flow rate is 6-12m / h, the granular sludge is in an expanded state, the pH value is adjusted to 7.0-7.5, and the residence time is 12-14h, and then enters the anoxic reactor to adjust The pH value is 7.0-7.5, the anoxic reactor uses ceramsite filler, the filling ratio is 50%, the reflux ratio of the effluent from the aerobic reactor to the anoxic reactor is 2, the residence time is 6h, and the gas-water ratio is 2 : 1, then enter t...

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Abstract

The invention discloses a method for processing and separate recycling of printing and dyeing wastewater, which comprises the following steps: after the printing and dyeing wastewater is firstly processed by an anaerobic reactor, a hypoxia reactor and an aerobic reactor, the separate recycling of part of the water is used for a desizing process of printing and dyeing technology; then, after the rest wastewater is processed by an aerator biofilter, the separate recycling of the part of the water is used for a boiling-off process of the printing and dyeing technology; then, after the rest wastewater is processed by an ultrafiltration reactor, the separate recycling of the part of the water is used for bleaching process and mercerization process of the printing and dyeing technology; finally, the rest water is processed by an anti-permeability reactor and the separate recycling of the part of the water is used for dyeing process, printing process and ordering process. After being processed by the invention, the printing and dyeing wastewater can be carried out the separate recycling quickly and high-efficiently and the recycling rate of the wastewater reaches more than 70 percent; meanwhile, the fee of processing and recycling the wastewater can be saved; the service life of advanced treatment equipment can be prolonged, which is easy for a large-scale industrialized application.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a printing and dyeing wastewater treatment and quality separation and reuse method. Background technique [0002] The textile printing and dyeing industry is an industrial industry that consumes a lot of water. Since all kinds of textile printing and dyeing products are processed with water as the medium in the process of wet processing, the printing and dyeing wastewater discharged during the production process has a large chroma and a high content of organic pollutants. , Water quality and water quantity change greatly, etc., and it is one of the difficult industrial wastewater to treat. [0003] The quality of printing and dyeing wastewater varies with fiber types and processing techniques, and the pollutant components vary greatly. The printing and dyeing process has a long program and many processes. Even the amount and nature of the wastewater produced by each process are v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F3/30C02F1/50
Inventor 任洪强张涛丁丽丽尤隽
Owner NANJING UNIV
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