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: 2011-01-26
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +3
View PDF2 Cites 63 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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 t
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0024] In a printing and dyeing enterprise, wastewater is generated in the desizing, smelting, dyeing, and rinsing sections. The main dyes in the dyeing section are reactive dyes, and the main additives used are sodium chloride and sodium hydroxide. In order to reduce the salt concentration of the discharged wastewater and reach the agricultural irrigation water quality standard (TDS<1000mg / L), the high-salt dyeing section wastewater is treated separately. Among them, the influent COD is 2000mg / L, the color 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 conditioning tank for homogenization; then into the reaction tank, adding 30~5000mg / L of ferrous sulfate to adjust the pH value of the printing and dyeing wastewater to 7, and coagulation reaction occurs; the effluent from the reaction tank enters the sedimentation tank for precipitation, and the wastewater is...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more 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 evaporator for 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 discharged in the whole process.
Description
Technical field [0001] The invention belongs to the field of sewage treatment engineering, and relates to a method for the desalination and reuse of dyeing wastewater and achieving 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 of my country's export earnings. However, the textile printing and dyeing industry is also a major pollution source of industrial water pollutants in my country. According to statistics from 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 various industrial departments in the country, and the environmental hazards are very serious. [0003] Printing and dyeing wastewater is the general term for wastewater discharged from various production links such as desizing, scouring, dyeing, bleaching, and finishi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more 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
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap