Treatment method and separation and recovery system of money printing wastewater

Abstract

The invention discloses a treatment method and a separation and recovery system of money printing wastewater and belongs to the technical field of the environment-friendly equipment. The treatment method of the money printing wastewater comprises the following steps: pressurizing the money printing wastewater to be treated to the range of 2-3MPa, and then carrying out coarse filtration to remove large-particle substances and obtain a filtrate; performing membrane filtration and separation on the filtrate, thereby obtaining a filtered concentrated liquid and a filtered clear liquid, respectively; performing reverse osmosis treatment on the filtered clear liquid, and removing the salts of the wastewater, thereby obtaining a reverse osmosis concentrated liquid and a reverse osmosis clear liquid; regulating the pH value of the reverse osmosis clear liquid until the reverse osmosis clear liquid is neutral, performing biochemical treatment on the reverse osmosis clear liquid and discharging the treated liquid after the liquid is up to standard; performing evaporating treatment on the reverse osmosis concentrated liquid and the filtered concentrated liquid, and separating to obtain a concentrated liquid and water, and performing de-solidification treatment on the concentrated liquid and conveying the water to mix with the original money printing wastewater for continuous treatment. The method is simple and reliable in operation and high in separation efficiency, and therefore, innocent and reduced emission of the money printing wastewater is reduced; the system is simple in structure, easy to operate, convenient to maintain, safe and reliable in operation, and good in treatment effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment, and in particular relates to a method for treating banknote printing wastewater and a separation and recovery system. Background technique [0002] Water-based ink pollutants are contained in the plate wiping wastewater of banknote printing and gravure printing. At present, the common practice in the banknote printing industry is to use ultrafiltration filtration equipment to treat the gravure wiping wastewater of banknote printing, reuse the ultrafiltered liquid in production, and separate the solid-liquid of the ultrafiltered concentrated solution after adding drugs and flocculating. Separated into solid material and clear liquid. The solid matter is treated as solid waste, and the clear liquid becomes a kind of high-concentration organic wastewater. [0003] Since banknote printing is part of the printing industry, its dye composition can refer to the composition o...

AI Technical Summary

Problems solved by technology

The COD of this waste water is as high as tens of thousands or hundreds of thousands, and it is extremely difficult to be biodegraded, so it has become an environmental protection problem that is difficult to solve in the banknote printing industry.

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