Method for reclaiming and utilizing paper-making industrial waste water

Abstract

The invention discloses a recycling method of papermaking industrial waste water, which combines membrane technology and industrial water treatment technology, and includes the following steps: a microfiltration process section, pretreatment of papermaking effluent treated by a biochemical system, Remove impurities in raw water; ultrafiltration process section, the pretreated permeate is treated with ultrafiltration membrane to further remove suspended solids and macromolecular particles in the water, reverse osmosis membrane process section, further pressurize the permeate through Reverse osmosis membrane desalination, COD removal, to obtain permeate that can be used in the production of ultra-pure water for boilers or in papermaking processes. The invention can completely recover and reuse water resources, and the index of the permeated liquid reaches the national drinking water standard, and can be completely applied to the production of ultrapure water for boilers or papermaking technology. The invention is suitable for the deep reuse of the discharged water after the wastewater treatment in the papermaking industry, and is also suitable for the deep reuse of the discharged water after the wastewater treatment in the printing and dyeing, steel, chemical and other industries.

Description

technical field [0001] The invention relates to a method for recycling papermaking industrial wastewater, in particular to a method for advanced treatment of papermaking industrial wastewater by using membrane technology, recycling water resources, and realizing zero discharge. Background technique [0002] Papermaking wastewater has the characteristics of large discharge, complex pollutants, and difficult treatment. Most of them are treated by chemical precipitation, drug flotation, air flotation, and biological oxidation. At present, after being treated by the above-mentioned environmental protection facilities, most of these wastewater are discharged as discharge water. The part that is used for reuse is only treated by traditional three-stage treatment process (ie, dosing, sand filtration, carbon filtration, etc.) and then used as primary reuse water, which is only used for watering flowers, cleaning the ground, etc., and there are problems such as poor water quality, I...

AI Technical Summary

Problems solved by technology

These works are also being carried out in the papermaking industry, but they are limited to the combination of the main process and the supporting process. It is more difficult, and most of them are only in the development and research stage at present.

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