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Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises

A dyeing wastewater with high salt content technology, which is applied in the field of reuse and desalination of dyeing wastewater, can solve the problems of large steam consumption, high power consumption, high operating costs, and difficult costs, so as to reduce the amount of evaporated water, reduce treatment costs, Effect of High Current Density

Inactive Publication Date: 2012-01-25
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +3
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  • Abstract
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Problems solved by technology

[0005] Evaporation technology is an effective technology to achieve zero discharge of wastewater, but the evaporation process is a phase change process, which consumes a lot of steam or electricity, and the operating cost is high
If the printing and dyeing wastewater, or just the high-concentration wastewater in the dyeing process, is directly evaporated, the cost is also difficult for enterprises to accept

Method used

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  • Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises
  • Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises
  • Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises

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Embodiment 1

[0024] In a printing and dyeing enterprise, waste water is generated in desizing, scouring, dyeing, rinsing and other processes. The main dyes in the dyeing process are reactive dyes, and the main additives used are sodium chloride and sodium hydroxide. In order to reduce the salt concentration of discharged wastewater and meet the agricultural irrigation water quality standard (TDS<1000mg / L), the wastewater from the dyeing section with high salt content is treated separately. Among them, the influent COD is 2000mg / L, the chromaticity is 1200 times, and the conductivity is 20000μs / cm.

[0025] See the specific operation process figure 1 . First, the high-concentration dyeing wastewater is sent to the adjustment tank for homogenization; then it enters the reaction tank, and ferrous sulfate is added to adjust the pH value of the printing and dyeing wastewater to 7, and the coagulation reaction occurs; the effluent from the reaction tank enters the sedimentation tank for precipi...

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Abstract

The invention discloses a method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises. The method comprises the following steps that: the wastewater enters a regulating reservoir first for homogenizing, and then enters a reaction tank, ferrous sulfate is added into the reaction tank to regulate the pH value and perform a coagulation reaction, effluent enters a sedimentation basin for precipitating after the reaction, supernate of the sedimentation basin is treated by an electrochemical reactor, enters a secondary sedimentation basin so as to remove scummings and dregs and enters an aeration tank for aerating, and the supernate is filtered by a manganese sand filter for deferrization after the aerating; the filtered effluent is treated by using an ultrafiltration membrane, concentrated water of the ultrafiltration membrane returns to the regulating reservoir, and fresh water enters a nanofilter membrane for treating; the fresh water outputted by the nanofilter membrane enters a reverse osmosis membrane, the outputted concentrated water returns to the regulating reservoir or is evaporated directly; and concentrated water of the reverse osmosis membrane enters an electrodialyzer, electrodialytic fresh water is refluxed to be used as inflow of the reverse osmosis membrane, and electrodialytic concentrated water enters an evaporatorfor evaporating. Vapor generated by evaporating can be used for printing and dyeing production, residues generated by the evaporating are used as solid wastes, and water pollutants are not dischargedin the whole process.

Description

technical field [0001] The invention belongs to the field of sewage treatment engineering and relates to a method for desalting and reusing dyed wastewater and realizing zero discharge. Background technique [0002] The textile printing and dyeing industry is a traditional industry of my country's national economy and a pillar industry for my country's export earnings. However, the textile printing and dyeing industry is also a key source of industrial water pollutants in my country. According to the statistics of the State Environmental Protection Administration, the total amount of printing and dyeing wastewater discharged by the printing and dyeing industry ranks fifth in the total discharge of all industrial sectors in the country, and the environmental hazards are very serious. [0003] Printing and dyeing wastewater is a general term for wastewater discharged from various production links such as desizing, scouring, dyeing, bleaching, and finishing in the printing and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F9/10C02F1/44C02F1/52C02F103/30
Inventor 陆继来褚红周海云邹敏王万寿常清波马晓英郑明建姜伟立王惠中吴海锁
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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