Method for treating dyeing wastewater in transfer piping by ozone

A technology for printing and dyeing wastewater and transportation pipelines, applied in the application field, can solve the problems of low mass transfer efficiency, achieve high mass transfer efficiency, short treatment process, and high effluent quality

Inactive Publication Date: 2007-10-10
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low mass transfer efficiency when ozone is used to treat pri

Method used

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  • Method for treating dyeing wastewater in transfer piping by ozone

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Embodiment Construction

[0010] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0011] The printing and dyeing wastewater 1 after pretreatment such as sand filtration, enters the ejector 5 after passing through the control valve 2, the flow meter 3 and the pump 4, and contacts with the ozone 6 in the ejector 5, and the mass transfer efficiency of the ozone is greater than 98%; then printing and dyeing Wastewater and ozone complete the oxidation reaction in the pipeline 7, the reaction time is 1s~5s, and the length of the pipeline 7 is 3~10m; the ozonated printing and dyeing wastewater enters the gas-liquid separation device 8 to separate the remaining ozone, and then the ozone After entering the residual ozone elimination device through the control valve 2, it becomes oxygen and then discharged; the decolorization rate of the effluent 10 can reach more than 98%, and the COD removal rate can reach more t...

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Abstract

This invention relates to a method for deeply treating printing and dyeing wastewater with ozone in transportation pipeline with a length of 3-10 m. In the transportation pipeline, the printing and dyeing wastewater is contacted and mixed with ozone via an injector to react for 1-5 s. The mass transfer efficiency of ozone is higher than 98%. The decolorization rate is higher than 98%. The removal rate of COD is higher than 95%. The method has such advantages as high water quality, saved water resources, high ozone mass-transfer efficiency, high ozone utility, no need for high-volume bubbling column, and no secondary pollution, and is suitable for deep treatment of industrial printing and dyeing wastewater, especially high-concentration printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to the application technical fields of environmental protection, industrial water treatment and the like, and relates to a method for treating printing and dyeing wastewater with ozone in a conveying pipeline. Background technique [0002] After my country's accession to WTO, the printing and dyeing industry has experienced unprecedented rapid development, and has become the largest country in the world's printing and dyeing industry. While the printing and dyeing industry creates economic benefits for the country, it has also become a major water polluter. The printing and dyeing industry discharges more than 720 million tons of wastewater every year. Printing and dyeing wastewater has large discharge, high chroma, high COD (2000-3000mg / L), and is difficult to biochemically degrade. It is currently recognized as one of the difficult-to-treat harmful industrial wastewater. The serious pollution of Taihu Lake and Huaihe River, prin...

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Application Information

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IPC IPC(8): C02F1/78
Inventor 白敏菂杨波白敏冬依成武张芝涛白希尧
Owner DALIAN MARITIME UNIVERSITY
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