Advanced treatment method for printing and dyeing wastewater

Abstract

The invention discloses a method which aims at the deep treatment of dyeing wastewater and has the advantages of simple operation, low cost and no secondary pollution. The method comprises the following steps: based on the biochemical-physical and chemical treatment of the dyeing wastewater, tail water obtained after treatment is lifted by a pump and enters a static adsorption bed for filling fine coal particles, the stay time is controlled to between 2 and 4 hours, difficultly degraded organic matters in the tail water are removed by adsorption, and the discharged water meets the discharge standards and is discharged or reutilized. The method has the advantages of unnecessary addition of other chemical agents, low operational cost and no secondary pollution; the stay time is short with no more than 4 hours, and the reactor occupies small areas; the pH value of the tail water does not need to be adjusted, and the tail water after treatment can be reutilized as reclaimed water; and saturated adsorbing materials are unnecessarily regenerated, and can be continuously used as fuel.

Description

technical field [0001] The invention relates to a method for advanced treatment or reuse of printing and dyeing wastewater, which is suitable for advanced treatment or reuse of printing and dyeing tail water after biochemical-physicochemical treatment. Background technique [0002] In 2007, the outbreak of cyanobacteria bloom in Taihu Lake gave birth to the standard of "Discharge Limits of Main Water Pollutants for Urban Sewage Treatment Plants and Key Industries in Taihu Lake Area". The "Taihu New Standard" was officially implemented on January 1, 2008. The scope of implementation includes Wuxi, Changzhou, Suzhou City, Lishui County, Nanjing City, Danyang City, Zhenjiang City, Gaochun County, Jurong City and other Taihu Lake Basins. The third local environmental protection standard issued by the province is stricter than the "national standard". Undoubtedly, the implementation of "Taihu New Standard" will accelerate the restructuring of the textile industry in the Taihu La...

AI Technical Summary

Problems solved by technology

[0004] The water quality of printing and dyeing wastewater is complex, especially the biochemical-physicochemically treated tail water has poor biodegradability and low concentration of suspended solids. The wastewater mainly contains organic substances that are difficult to degrade biochemically. Traditional physicochemical or biochemical processes have little effect on tail water treatment.

The chemical oxidation method is used for advanced treatment, and the commonly used oxidizing reagents such as chlorine dioxide, hydrogen peroxide oxidation and other chemicals are expensive, resulting in high processing costs; the adsorbents used in the adsorption method include activated carbon, resin, etc., which also have high processing costs and difficult regeneration of the adsorbent. problems; nanofiltration and reverse osmosis, which are commonly used in membrane separation technology, have good treatment effects, and the key technologies and equipment are basically mature, but there are still some problems in the advanced treatment of industrial wastewater, such as expensive membrane materials and short service life , higher power consumption, etc.

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