Cotton pulp wastewater deep treatment reusing device and method thereof

Abstract

The invention relates to a cotton pulp wastewater deep treatment reusing device and a method thereof and aims at the problems that effluent of existing cotton pulp wastewater biochemical treatment hastoo high COD (chemical oxygen consumption) and cannot meet the new emission standards, wastewater discharge is not reduced, and the like. The method comprises the steps: firstly, deep treating cottonpulp wastewater which is treated by a biochemical system through a self-cleaning filter, a cavitating device of a pretreatment system, an electrochemical device of the pretreatment system and a membrane separation device of the pretreatment system according to an effluent sequence to reduce a COD value; then utilizing a low-pressure reverse osmosis device to perform primary concentration on the cotton pulp wastewater; thirdly, utilizing the low-pressure reverse osmosis concentrated water treatment cavitating device and the low-pressure reverse osmosis concentrated water treatment membrane separation device to reduce an raised COD value caused by primary concentration again; finally, utilizing a high-pressure reverse osmosis device to perform final concentration. Reverse osmosis effluent can be reused, the reuse rate can exceed 95%, and concentrated water can meet the standards and be drained after being reduced; thus, the purposes of water conversation and emission reduction of cottonpulp production enterprises are achieved.

Description

technical field [0001] The invention relates to a device for advanced treatment and reuse of cotton pulp wastewater and a method thereof, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] The production of cotton pulp is a kind of high-purity cellulose made of cotton linters, caustic soda, hydrochloric acid, sodium hypochlorite and other chemical raw materials and additives as the main raw materials, which are cooked, washed, bleached and copied. It is mainly used in the manufacture of cellulose acetate, nitrocellulose and ether cellulose, and is widely used in food, medicine, textile, light industry, papermaking, chemical industry, aerospace and military industry and other fields. At present, the production pollution of cotton pulp is very serious, which restricts the development of cotton pulp production enterprises. [0003] The production process of cotton pulp produces a lot of pollution, especially the high-concentrat...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a device and method for advanced treatment and reuse of cotton pulp wastewater. Issues such as unreduced emissions; cavitation device COR using self-cleaning filter AF, pretreatment system 1 , the electrochemical device AOR of the pretreatment system, the membrane separation device MSD of the pretreatment system 1 Reduce the COD value of cotton pulp wastewater after biochemical treatment; use the low-pressure reverse osmosis device BWRO to recover the produced water, and initially concentrate the cotton pulp wastewater; use the low-pressure reverse osmosis concentrated water treatment cavitation device COR 2 , Membrane separation device MSD for low-pressure reverse osmosis concentrated water treatment 2 Reduce the COD value of the concentrated cotton pulp wastewater again; use the high-pressure reverse osmosis device SWRO to recycle the produced water, further concentrate the cotton pulp wastewater after the initial concentration; achieve advanced treatment and reuse of the cotton pulp wastewater after biochemical treatment the goal of

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