A method and device for pretreatment of ink printing waste liquid

Abstract

The invention discloses a method and device for preprocessing ink printing waste liquid.The device comprises a reactor, a processing machine, filters and a nitrogen recycling tank.The processing machine comprises a resin separation tank, a sludge precipitation tank, a draining tank and a reflux water pump.A reflux water pipe is arranged between the resin separation tank and the draining tank.The reflux water pump is arranged on the reflux water pipe.A resin discharge pipe is arranged between the resin separation tank and the filter.A resin discharge pump is arranged on the resin discharge pipe.The first filter is located above the nitrogen recycling tank.The second filter is arranged between the nitrogen recycling tank and the reaction tank of the processing machine, a resin discharge pipe is arranged between the nitrogen recycling tank and the second filter, a sludge pump is arranged on the resin discharge pipe, and the second filter is located above the reaction tank of the processing machine.By the method and device, the decoloring rate of high-concentration printing waste liquid can reach up to more than 99.5%, ammonium-nitrogen removal rate can reach about 90%, CODCr removal rate can reach more than 90%, waste liquid decoloring and nitrogen recycling are achieved synchronously, and the content of acid radical ions in waste water is not increased.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in environmental engineering, and in particular relates to a pretreatment method and device for ink printing waste liquid. Background technique [0002] 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 is produced during the production process. Although the amount of waste liquid of this kind of ink is small, the waste liquid contains high-concentration pigments, water-soluble acrylic resin, alcohol, amine (ammonia) and other pollutants. (Chromaticity: more than 30,000 times; COD Cr : 100,000-500,000 mg / L; ammonia nitrogen: 1000-5000 mg / L), difficult to handle. Most enterprises use physical and chemical methods for pretreatment and then mix them with domestic sewage for treatment, which increases the amount of wastewater treatment. [0003] For t...

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., increase investment in treatment system infrastructure

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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