Physical pretreatment system for paper mill wastewater

Abstract

The invention provides a physical pretreatment system for paper mill wastewater and discloses a physical adsorption system for pretreatment of the paper mill wastewater. The system is characterized by comprising an adjusting collecting tank, a grating, a grit sedimentation tank, a physical filtration tank, an ice grating, an electromagnetic adsorption tank, a floatation tank, a mud storage tank and a belt filter press. The system adopts environment-friendly ice grating equipment with the low energy consumption, is applied to the papermaking wastewater treatment technology for the first time, and has obvious effects of removing organic matters and small suspended solids which are unique to papermaking wastewater and difficult to remove. According to the physical adsorption treatment system, no chemical reagent is added, no biological treatment method is adopted, sludge and strains are not introduced, the removal rate of the suspended solids is up to 96.1%, the removal rate of chromaticity is 90.1%, and the removal rate of turbidity is 98.8%.

Description

technical field [0001] The invention relates to a physical pretreatment system for paper mill wastewater, which belongs to the field of water treatment in environmental protection. Background technique [0002] With the continuous development of the economy and the continuous improvement of living standards, people pay more and more attention to the protection of the environment. According to relevant data, the annual sewage discharge in my country is about 3.9 tons, and it increases at a rate of 1%. my country is a large paper-making household, and the discharge of paper-making wastewater is large. At present, there are more than 10,000 large, medium and small paper mills in my country, and the annual wastewater discharge volume is as high as more than 4 billion m 3 , accounting for one-sixth of the total discharge of wastewater in the country, and the annual discharge of BOD in papermaking wastewater is more than 2 million tons, accounting for 25% of the BOD in the total ...

AI Technical Summary

Problems solved by technology

At present, most large paper mills in China have wastewater treatment facilities, but some of them are directly discharged without treatment or fail to meet the standards. Some small paper mills have no wastewater treatment facilities at all, and the wastewater is directly discharged into surrounding rivers, causing damage to the surrounding environment. seriously affected

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