A kind of treatment method of paper mill production waste water

Abstract

The invention discloses a method for treating waste water produced in a paper mill. The waste water passes through a pretreatment sump, a grid, a grit chamber, a physical filter, an ice grid, an electromagnetic adsorption pool, an air flotation pool, an acidification pool, a contact oxidation pool, and Secondary sedimentation tank, artificial wetland treatment system, recirculation storage tank, mud storage tank, belt filter press. This system adopts low energy consumption and environment-friendly ice grid equipment. It is the first time that it is applied to the papermaking wastewater treatment process. It has obvious removal effect on the unique and difficult-to-remove organic matter and small solid suspended matter in papermaking wastewater, without adding chemical reagents. In the papermaking wastewater treated by this method, the removal rate of chemical oxygen demand reaches 98.1%, the removal rate of total nitrogen reaches 97.2%, the removal rate of five-day biochemical oxygen demand reaches 95.1%, and the removal rate of suspended matter reaches 96.1%. , The color 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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