Wastewater treatment and reuse technology for paper mill

Abstract

The invention provides a wastewater treatment and reuse method for a paper mill. The method comprises the following steps: (a) physical treatment: providing wastewater from the paper mill, and removing the cellulose and other foreign impurities in the wastewater from the paper mill to obtain the wastewater from the paper mill after the physical treatment; (b) biochemical treatment: performing biochemical treatment and deposition to the paper mill wastewater obtained in the step (a) after the physical treatment to obtain safe pool water conforming to the required emission standard; and (c) advanced treatment: providing air-floatation water after super-efficient shallow air-floating treatment in a machine room and merging the air-floatation water with the safe pool water obtained in the step (b) to obtain intermediate water, and then performing intermediate water advanced treatment, i.e. adding drugs into the intermediate water, coagulating, depositing and filtering to obtain purified water; and performing fiber bunch or the biological film technical treatment to the purified water to obtain effluent.

Description

technical field [0001] The invention relates to a waste water treatment and reuse technology, in particular to a pulp and paper mill waste water reuse technology. Background technique [0002] my country is a country that is very short of water resources. The pulp and paper industry consumes a lot of water, and the average water consumption per ton of paper in my country is more than five times that of the international advanced level. A large amount of water consumption will inevitably lead to the discharge of a large amount of waste water, causing serious environmental pollution. When water use is constrained by resources, costs, and the environment, water conservation and pollution reduction are major issues that every enterprise must face and solve. [0003] The degree of reuse of pulping and papermaking wastewater varies greatly depending on the pulping method, pulp type, bleaching method, paper type, pulp properties, type and amount of chemical additives, etc. Many p...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that this technology is only applicable to the papermaking method of producing packaging paper from waste cardboard and waste paper fiber raw materials, but cannot be applied to the papermaking method of high-grade paper containing pulping and bleaching

The disadvantage of this patent application is that it cannot be applied to the papermaking method of high-grade paper containing pulping and bleaching, so the waste water can only be reused as cooling water

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