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Method for realizing closed cycle of dyeing waste water

A printing and dyeing wastewater, closed-loop technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as pollution, achieve process stability and easy industrial application , the effect of convenient operation

Inactive Publication Date: 2009-05-13
王克佳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology not only solves the pollution problem in the printing and dyeing industry, protects the ecological environment, but also provides theoretical and technical support for promoting cleaner production in the printing and dyeing industry

Method used

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  • Method for realizing closed cycle of dyeing waste water
  • Method for realizing closed cycle of dyeing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 Shown, the processing method of printing and dyeing waste water closed loop, comprises the following steps:

[0026] 1) Put the printing and dyeing wastewater into the printing and dyeing wastewater collection tank, use mechanical stirring to clarify the tank, add flocculant and coagulant aid, and the residence time is 20min. The flocculant used in the flocculation and precipitation process is polyaluminum chloride PAC, and the amount of PAC The coagulation aid is polyacrylamide PAM, and the amount of PAM added is 0.5mg / L. The generated sludge is dehydrated by a centrifuge; the COD of the supernatant after flocculation and precipitation is <150mg / L, and the conductivity Rate<400μs / ms, turbidity<30mg / L, SS<60mg / L, chroma<60 times, printing and dyeing wastewater removes more than 50% of chroma and COD through flocculation and sedimentation. Printing and dyeing wastewater is removed by flocculation and sedimentation process to remove chroma and C...

Embodiment 2

[0030] Embodiment 2: as figure 1 Shown, the processing method of printing and dyeing waste water closed loop, comprises the following steps:

[0031] 1) Put the printing and dyeing wastewater into the printing and dyeing wastewater collection tank, use mechanical stirring to clarify the tank, add flocculant and coagulant aid, and the residence time is 20min. The flocculant used in the flocculation and precipitation process is polyaluminum chloride PAC, and the amount of PAC The coagulation aid is polyacrylamide PAM, and the amount of PAM added is 1mg / L. The generated sludge is dehydrated by a plate and frame filter press; the COD of the supernatant after flocculation and precipitation is <150mg / L, Conductivity<400μs / ms, turbidity<30mg / L, SS<60mg / L, chroma<60 times, printing and dyeing wastewater removes more than 50% of chroma and COD through flocculation and sedimentation.

[0032] 2) The supernatant separated by flocculation and precipitation enters the microfilter to remov...

Embodiment 3

[0035] Embodiment 3: as figure 1 Shown, the processing method of printing and dyeing waste water closed loop, comprises the following steps:

[0036] 1) Put the printing and dyeing wastewater into the printing and dyeing wastewater collection tank, use mechanical stirring to clarify the tank, add flocculant and coagulant aid, and the residence time is 20min. The flocculant used in the flocculation and precipitation process is polyaluminum chloride PAC, and the amount of PAC The coagulation aid is polyacrylamide PAM, and the amount of PAM added is 0.75mg / L. The generated sludge is dehydrated by a centrifuge; the COD of the supernatant after flocculation and precipitation is <150mg / L, and the conductivity Rate<400μs / ms, turbidity<30mg / L, SS<60mg / L, chroma<60 times, printing and dyeing wastewater removes more than 50% of chroma and COD through flocculation and sedimentation.

[0037] 2) The supernatant separated by flocculation and precipitation enters the microfilter to remove ...

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Abstract

The invention discloses a disposing method of loop circulating printing and dyeing wastewater, which is characterized by the following: regenerating printing and dyeing wastewater; removing most of COD and colority in the printing and dyeing wastewater through flocculating and sedimenting; proceeding further disposal in the micro-filter; obtaining the disposed water with less than 10mg / L COD and 300 mus / ms conductivity without turbidity, SS and colority; utilizing soft water in the printing and dyeing technology as washing water to realize loop circulation.

Description

Technical field: [0001] The invention relates to a treatment method for closed-circuit circulation of printing and dyeing wastewater, which belongs to the treatment method of wastewater. Background technique: [0002] The printing and dyeing industry is a large discharge of industrial wastewater. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in the country is 3×10 6 ~4×10 6 t . Printing and dyeing wastewater has the characteristics of large water volume, deep color, high alkalinity, and large fluctuations in water quality. It is a difficult-to-treat industrial wastewater. my country's comprehensive sewage discharge standard (GB8978-1996) clearly stipulates that projects constructed after January 1, 1998 must implement new discharge standards. The new standard sets stricter regulations on the discharge of printing and dyeing wastewater, and it is difficult for traditional printing and dyeing wastewater treatment technologies to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/52
Inventor 张永锋吉仁塔布郝云升王先平崔景东
Owner 王克佳