A paper mill waste water recycling process

Abstract

The invention discloses a waste water recovery and treatment process in a paper mill: a. Waste water passes through a grit chamber to remove particles, enters a primary sedimentation tank for precipitation; b. then enters a hexagonal mesh screen for filtration through a lifting pump, and then enters a sedimentation tank for the second c. enters the grid, recycles fine fibers, and removes difficult-to-degrade substances in the water; d. then enters the adjustment tank to adjust peaks and valleys and homogeneity; e. Remove dispersed particles; f. Then the wastewater enters the coagulation mixing tank, and coagulation aid is added for coagulation; g. Enters the shallow pool for air flotation to precipitate fine particles; h. Finally enters the biological filter for physical and chemical adsorption and carbon surface biooxidative decomposition; i. Finally discharged to the outside; the paper mill wastewater recycling process ensures that the wastewater discharges up to the standard, and the wastewater recovery rate of this process is high, the pollution rate is low, and the use cost is low.

Description

technical field [0001] The invention relates to a process for recycling and treating waste water in paper mills. Background technique [0002] The treatment of industrial wastewater has always been one of the important issues that plague the development of our country, and the wastewater discharged by the paper industry includes "white water" and "black water". According to the design, the chemical substances and suspended solids contained in "black water" are relatively complex, and "black water" has a high temperature, relatively poor biochemical properties, low water recycling rate, and discharge into the environment will cause serious pollution to the environment. At present, my country has taken measures to close or suspend a large number of heavily polluting paper mills, but such an approach not only damages our economic development, but also fails to solve the problem of wastewater discharge from paper mills from the root. Contents of the invention [0003] The techn...

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Problems solved by technology

[0002] The treatment of industrial wastewater has always been one of the important issues that plague the development of our country, and the wastewater discharged by the paper industry includes "white water" and "black water". According to the design, the chemical substances and suspended solids contained in "black water" are relatively complex, and "black water" has a high temperature, relatively poor biochemical properties, low water recycling rate, and discharge into the environment will cause serious pollution to the environment. At present, my country has taken measures to close or suspend a large number of heavily polluting paper mills, but such an approach not only damages our economic development, but also fails to solve the problem of wastewater discharge from paper mills at the root.

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