A treatment system for paper mill production wastewater

Abstract

The invention discloses an industrial waste-water treating system for a paper making factory. The industrial waste-water treating system comprises a pretreatment water collecting tank, a grating, a grit tank, a physical filter tank, an ice grating, an electromagnetic adsorption tank, an air floating tank, an acidification tank, a contact oxidation tank, a secondary sedimentation tank, a reflux treating tank, an artificial wetland treating system, a recirculation storage tank, a sludge storage tank, and a belt pressure filter, wherein the temperature in ice grating equipment is minus 2-10 DEG C. The waste-water treating system adopts environment-friendly ice grating equipment with low energy consumption, and the ice grating equipment is applied for the waste-water treating technology in paper making for the first time; the waste-water treating system has an obvious removing effect on organic matters and small-sized solid suspended matters, which are unique and difficult to remove, in paper-making waste water, and chemical reagents are not added. In the paper-making waste water treated by the waste-water treating system, the removal rate of chemical oxygen demands is 98.1%; the removal rate of total nitrogen is 97.2%; the removal rate of five-day biochemical oxygen demands is 95.1%; the removal rate of suspended matters is 96.1%; the removal rate of chroma is 90.1%; the removal rate of turbidity is 98.8%.

Description

technical field [0001] The invention relates to a treatment system for 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 d...

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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