Paper mill production wastewater treatment method

Abstract

The invention discloses a paper mill production wastewater treatment method. Wastewater sequentially goes through a pretreatment water collection pool, a grating, a sand basin, a physical filtering pool, an ice gate, an electromagnetic adsorption pool, an air floatation pool, an acidifying pool, a contact oxidation pool, a secondary sedimentation pool, a constructed wetland treatment system, a recirculation storage pool, a mud storage pool and a belt filter press. The low energy consumption and environmental protection ice gate is adopted in the invention, is used in the papermaking wastewater treatment process for the first time, and has obvious removal effects on small solid suspension and unique organic matters difficult to remove in papermaking wastewater without adding chemical reagents. In the papermaking wastewater treated through the method, the removal rate of chemical oxygen demand is 98.1%, the removal rate of total nitrogen is 97.2%, the removal rate of five-day biochemical oxygen demand is 95.1%, the removal rate of suspensions is 96.1%, the chroma removal rate is 90.1%, and the turbidity removal rate is 98.8%.

Description

technical field [0001] The invention relates to a method for treating waste water produced by a paper mill, belonging 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 di...

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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