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Treating process of printing and dyeing waste water

A treatment process, technology for printing and dyeing wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve printing and dyeing wastewater's poor biodegradability and difficulty in meeting primary and secondary discharge requirements and other problems, to achieve the effect of stable treatment effect, low operating cost and meeting water quality requirements

Inactive Publication Date: 2011-05-18
OCEAN UNIV OF CHINA
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  • Claims
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AI Technical Summary

Problems solved by technology

Because the COD caused by chemical slurry such as PVA accounts for a large proportion of the total COD of printing and dyeing wastewater, the biodegradability of printing and dyeing wastewater is poor, and the COD removal rate of the original biological treatment system has dropped from 70% to about 50%. The general treatment process is difficult to meet the first and second discharge requirements stipulated in the "Discharge Standard for Wastewater Pollutants of Textile Dyeing and Finishing Industry" (GB4287-92)

Method used

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  • Treating process of printing and dyeing waste water

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Embodiment Construction

[0013] The present invention handles technical process such as figure 1 As shown, it consists of grid 1, regulating tank 2, sedimentation tank 3, decolorization fluidized bed 4, hydrolytic acidification tank 5, aerobic membrane bioreactor 6, sludge thickening tank 7 and sludge dewatering tank 8, and the specific implementation The way is as follows:

[0014] 1. Printing and dyeing wastewater passes through the grid 1 to intercept larger suspended and floating substances to reduce the processing load of subsequent treatment structures, and the generated grid slag is transported outside for treatment.

[0015] 2. The printing and dyeing wastewater treated by the grid 1 is adjusted by the regulating tank 2 for water quantity and quality, and then enters the sedimentation tank 3 to remove suspended matter.

[0016] 3. The effluent from the sedimentation tank 3 enters the decolorization fluidized bed 4, and decolorizes the wastewater through the manganese sand catalyzed primary ce...

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Abstract

The invention relates to a treating process of printing and dyeing waste water, which comprises a grid, a conditioning tank, a settling tank, a decoloring fluid bed, a hydrolysis and acidification tank, an aerobic membrane bioreactor, a sludge thickening tank and a sludge dewatering tank, wherein a stuffing mixture of natural manganese sand and spongy iron (or scrap iron) with a thickness of 100-120 cm is arranged in the decoloring fluid bed. The treating process provided by the invention can effectively weaken the color of the printing and dyeing waste water and remove organic pollutants from the printing and dyeing waste water, has the advantages of stable treatment effect, low running cost, small sludge discharge amount and the like, and is convenient to operate and easy to automatically control. The quality of the treated water can come up to the discharging standards and meet the water quality requirements for reuse water for production, thereby having favorable environment benefits, economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a printing and dyeing wastewater treatment process. Background technique [0002] Printing and dyeing wastewater is the wastewater discharged during the pretreatment, dyeing, printing and finishing processes of cotton, wool, chemical fiber and other textile products, mainly from bleaching, dyeing, desizing, finishing and other processes. Printing and dyeing wastewater has the characteristics of large water volume, complex components, high content of organic pollutants, deep color and poor biodegradability. It is one of the more difficult industrial wastewater to treat. If the printing and dyeing wastewater is not discharged into the water body up to the standard, the organic pollutants contained will consume the dissolved oxygen in the water, and the high chroma will affect the natural landscape of the water body and hinder the transmission of sunlight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 高孟春张优王悦静王子超于恒李冰梁方圆刘洁琼
Owner OCEAN UNIV OF CHINA
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