Combined technology for treatment and recycle of production sewage

Abstract

The invention discloses a combined technology for treatment and recycle of production sewage. The combined technology for treatment and recycle of production sewage comprises sewage pretreatment, sewage depth treatment and sewage desalination treatment. A process flow of the combined technology comprises that sewage is orderly treated by a grille, a sewage adjustment tank, an air floatation tank, a sedimentation tank, a fiber filtration unit, a sand filtration water inlet station, a sand filtration device, a water collecting tank, an ultrafiltration elevator pump, a self-cleaning filter, an ultrafiltration device, an intermediate water tank, a reverse osmosis elevator pump, a clear water tank, a reuse water elevator pump and a reuse water tank. The combined technology utilizes steel enterprise production sewage as a water source and mainly adopts an air floatation tank-sedimentation tank-fiber filtration unit-sand filtration device-ultrafiltration device combined way before a reverse osmosis desalination process. The combined technology can effectively remove oil pollutants, organic matter pollutants, colloid pollutants and suspension pollutants in sewage, improve reverse osmosis feed water quality, reduce chemical cleaning frequency of a reverse osmosis membrane, increase a service life of the reverse osmosis membrane, and reduce an operation cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment equipment, in particular to a combined process for reuse of production sewage after treatment applied to the iron and steel industry. Background technique [0002] At present, although the iron and steel industry has become an important pillar to promote the steady and rapid development of the national economy, it is also one of the industries with high energy consumption and high pollution. According to relevant data, the energy consumption of iron and steel enterprises accounts for about 15% of the country's total energy consumption, sulfur dioxide emissions account for 6.6% of the country's total, and water consumption accounts for 14% of the total industry. Although the iron and steel industry is a large energy consumer and pollutant discharger, it also has great potential for energy conservation and emission reduction. [0003] In order to promote the work of reducing consumption and...

AI Technical Summary

Problems solved by technology

This process is used to treat wastewater with good water quality, and it is easy to pollute the membrane system when the water quality is poor

[0008] To sum up, these water treatment technologies still have certain problems in terms of the reuse of wastewater treatment in iron and steel enterprises

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