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Multi-stage combined degradation and recycle method for printing and dyeing wastewater

A technology for printing and dyeing wastewater and its usage is applied in the field of degradation and reuse of printing and dyeing wastewater, which can solve the problems of high process requirements, high cost, and many technical influencing factors.

Inactive Publication Date: 2009-01-14
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon adsorption method has the advantages of wide application range, good treatment effect, recyclable useful materials, and reusable adsorbent. However, activated carbon is easily saturated and difficult to regenerate. The process has high requirements for influent pretreatment, high operating costs, and a large system. Operation is more troublesome
④ Ozone oxidation method: This method has a good removal effect on dissolved organic pollutants in wastewater, but there are many factors affecting this technology, high process requirements and high cost
However, this method must be treated with NaClO, NaOH and anionic polyacrylamide after the micro-electrolysis, so that the Fe produced in the micro-electrolysis process 2+ Completely removed, increasing handling and cost

Method used

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  • Multi-stage combined degradation and recycle method for printing and dyeing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0026] ① COD of printing and dyeing wastewater before treatment Cr =850, chroma 180.

[0027] ② Adjust the pH value of the wastewater to approximately equal to 9, pour 50L of wastewater into the ozone-UV-activated carbon oxidation tower (adding 2000g of activated carbon), irradiate with a 50W ultraviolet lamp, and blow ozone from the bottom of the oxidation tower for 0.2 hours , stop blowing ozone. The chromaticity is reduced to 10, and the amount of ozone depletion is about 0.7mg. The calculated ozone depletion per cubic waste water is about 0.14kg.

[0028] ③ Leave the waste water obtained in the previous step for 1 hour to decompose the excess ozone, and then pour it into the rinse tank. After the dyed fabric is initially rinsed, the chromaticity of the waste water rises to 160, COD Cr up to 1300. The sewage is decolorized through an ozone-UV-activated carbon oxidation tower, and the chromaticity is reduced to 15.

[0029] ④ Treat the waste water obtained in the previou...

Embodiment 2

[0034] ① COD of printing and dyeing wastewater before treatment Cr =1300, chroma 220.

[0035] 2. Adjust the pH value of the wastewater to approximately equal to 7, inject 50L of wastewater into the ozone-UV-activated carbon oxidation tower (wherein 2000g of activated carbon is added), blow into ozone from the bottom of the oxidation tower, and stop blowing into the ozone after 0.25 hours. The chromaticity is reduced to 20, and the amount of ozone depletion is about 1.05 mg. The calculated ozone depletion per cubic waste water is about 0.21 kg.

[0036] ③Put the wastewater obtained in the previous step into the rinsing tank, and perform preliminary rinsing on the dyed fabric. After reuse once, the chromaticity of the wastewater rises to 210, COD Cr up to 1950. After being decolorized by the ozone-UV-activated carbon oxidation tower, the chroma is reduced to 28, and then put into the rinsing tank for preliminary rinsing of the dyed fabric, and the chroma of the wastewater ris...

Embodiment 3

[0042] ① COD of printing and dyeing wastewater before treatment Cr =710, chroma 350.

[0043] ②Adjust the pH value of the wastewater to approximately equal to 9, put 50L of wastewater into the ozone-UV-activated carbon oxidation tower, blow in ozone from the bottom of the oxidation tower, and stop blowing in ozone after 0.25 hours. The chromaticity is reduced to 12, and the amount of ozone depletion is about 0.85 mg. The calculated ozone depletion per cubic waste water is about 0.17 kg.

[0044] ③Put the wastewater obtained in the previous step into the rinsing tank, and perform preliminary rinsing on the dyed fabric. After reuse once, the chromaticity of the wastewater rises to 380, COD Cr up to 1250. After being decolorized by the ozone-UV-activated carbon oxidation tower, the chroma is reduced to 18, and then poured into the rinse tank for preliminary rinsing of the dyed fabric, and the chroma of the wastewater rises to 385 after being reused twice, COD Cr up to 1640. R...

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Abstract

Disclosed is a printing and dyeing wastewater multistage combined degradation recycling method, comprising three steps of: decolorizing by ozone oxidization method, micro-electrolysis treatment and bio-chemical treatment. Wherein, the printing and dyeing wastewater is firstly used for the preliminary rinsing of dyed fabrics after the first decolorizing by ozone oxidization method, then undergoes the second decolorizing by ozone oxidization method and then the micro-electrolysis treatment and finally the bio-chemical treatment. The recycling usage process of decolorizing by ozone oxidization method to the preliminary rinsing of dyed fabrics can be repeated for two to six times. Fe<2+> produced in the micro-electrolysis process need not be removed deliberately after the micro-electrolysis. The Fe<2+> produced in the micro-electrolysis process is transformed into Fe(OH)3 deposition for removal in the backward stage of bio-chemical treatment process. The treated wastewater can fully conform to I-grade discharge indexes of pollutant discharge standard GB 4287-92 in the textile dyeing and finishing industry water. Because the process of decolorizing by ozone oxidization method to the preliminary rinsing of fabrics can be repeated, mass clear water can be saved.

Description

technical field [0001] The invention relates to a method for degrading and recycling printing and dyeing wastewater, and a multi-stage combined degradation and recycling method for printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater has the characteristics of being difficult to decolorize and having a long retention period in the environment, which is very serious for environmental pollution. At present, the domestic printing and dyeing wastewater treatment methods mainly include: ①Coagulation method: reduce the turbidity and chroma of sewage by coagulation technology, remove various high molecular organic matters, some heavy metal ions, etc., but the treatment effect on dissolved organic matter is relatively poor Poor, and the amount of sludge produced is large. ②Biochemical method: This method uses the metabolism of microorganisms to convert various dissolved or colloidal organic pollutants in sewage into stable and harmless substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/78C02F1/461C02F103/30
Inventor 王遵尧翟志才刘辉王玉洁
Owner JIAXING UNIV
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