Synchronous decoloration and nitrogen recovery method and equipment for high-concentration printing waste liquids

Abstract

The invention discloses a synchronous decoloration and nitrogen recovery method and equipment for high-concentration printing waste liquids. The equipment comprises a treatment machine, filters and a nitrogen recovery tank, wherein the treatment machine comprises a reaction tank, a primary separation tank, a secondary separation tank, a water storage tank and a water return pump, a water return pipe is arranged between the water storage tank and the primary separation tank, and the water return pump is arranged on the water return pipe; a resin discharge pipe I is arranged between the primary separation tank of the treatment machine and a filter I, a resin discharge pump I is arranged on the resin discharge pipe I, and the filter I is located above the nitrogen recovery tank; a filter II is arranged between the nitrogen recovery tank and the reaction tank of the treatment machine; a resin discharge pipe II is arranged between the nitrogen recovery tank and the filter II, a resin discharge pump is arranged on the discharge pipe II, and the filter II is located above the reaction tank of the treatment machine. With the adoption of the method and the equipment for treatment, the decolorization rate of the printing waste liquids is higher than 99.5%, the ammonium-nitrogen removal rate is about 90%, the CODCr removal rate is higher than 90%, synchronous decoloration and nitrogen recovery of the waste liquids are realized, and the content of acid group anion in the wastewater is not increased.

Description

Technical field [0001] The invention belongs to the technical field of textile printing and dyeing industry, and particularly relates to a method for synchronous decolorization and nitrogen recovery of high-concentration printing waste liquid and continuous treatment equipment. Background technique [0002] Water-based inks are mainly composed of water-soluble resins, pigments, alcohols, amines or ammonia and other additives and water. Water-based inks are widely used in various fields because of their health, environmental protection, and safety characteristics. At present, a large number of plastic packaging (waterproof) materials are increasingly using water-based inks when printing, and a certain amount of high-concentration water-based ink waste liquid is generated during the production process. This kind of ink waste liquid contains pollutants such as pigments, water-soluble acrylic resins, alcohols, amines (ammonia), etc., with high organic content, high chroma, high nitr...

AI Technical Summary

Problems solved by technology

However, the coagulation method and acid precipitation method can only remove water-soluble acrylic resins, pigments and other organic substances in the waste liquid, but cannot remove the ammonia nitrogen in the waste liquid at the same time. Usually, other chemical or biological methods are required for separate nitrogen removal, such as Chemical precipitation method, stripping method, biological denitrification, etc.

Especially the acid analysis method directly adds inorganic acid to the waste liquid, which increases the content of acid radical ions in the waste water, causes secondary pollution, and easily forms brackish water

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