Catalytic oxidation evaporation recovery system for mercerizing waste alkali liquid of yarn-dyed fabric

Abstract

The invention discloses a catalytic oxidation evaporation recovery system for a mercerizing waste alkali liquid of a yarn-dyed fabric. The system comprises a fresh alkali liquid filtration and collection unit, an alkali concentration and evaporation and collection unit and a concentrated alkali liquid catalytic oxidation decoloring nit, wherein the fresh alkali liquid filtration and collection unit comprises a self-cleaning filter A and a fresh alkali collecting tank which are sequentially connected in series by virtue of a pipeline; the alkali concentration and evaporation and collection unit comprises a dilating evaporator and the like, the outlet of a fresh alkali conveying pump is connected to a box body of the dilating evaporator by virtue of a pipeline, and a plurality of process routes for regenerating and reusing the waste alkali liquid, extracting valuable components and recovering and recycling are formed after treatment by the dilating evaporator; the waste alkali liquid is regenerated and reused by using a concentrated alkali catalytic oxidation decoloring process. By virtue of treatment means such as improving the hydraulic condition, increasing the reaction area and introducing the catalytic oxidation reaction and the like, processes such as settlement, filtration, catalytic oxidation, evaporation and the like are combined together, so that the system has the characteristics of high impurity-removing efficiency, high decoloring efficiency, and high evaporation efficiency and is simple and convenient to operate and maintain.

Description

technical field [0001] The invention belongs to a textile printing and dyeing waste liquid treatment system, in particular to a system for removing impurities, decolorizing and evaporating waste lye for yarn-dyed cloth mercerizing. Background technique [0002] The general characteristics of mercerizing waste lye are high suspended solids, deep color, and high content of refractory organic matter. The mercerizing dilute lye wastewater is produced in the mercerizing process. After the fabric is soaked in sodium hydroxide concentrated solution, it will be treated with clean water. Washing, the wastewater after washing is dilute lye wastewater. The fiber and chroma in waste lye are the main factors affecting the recycling of lye and the main object of separation in the purification process. The fibers are mainly derived from fabrics. When the fabrics are soaked in the concentrated sodium hydroxide solution, the fibers in the fabrics will be mixed into the concentrated sodium h...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing high chroma refractory waste lye recovery technology, especially the shortcomings of the existing adsorption and oxidation decolorization methods and devices

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