Combined graded reuse of urban reclaimed water and steel wastewater for steel enterprise systems and processes

Abstract

The invention relates to a system and process for combined and graded recycling of urban gray water and steel wastewater for use in iron and steel enterprises, and belongs to the technical field of recycling and utilization of urban gray water and steel production wastewater. This invention uses the urban gray water discharged from the urban sewage treatment plant to be recycled into the clean water pipe network and new water pipe network of the iron and steel enterprise after two-stage treatment of the first-level gray water treatment system and the second-level deep treatment system. At the same time, the iron and steel production wastewater After the first-level wastewater treatment system, the second-level deep treatment system, and the third-level desalination system, it is graded and recycled for use in the steel enterprise itself. The use of hierarchical joint treatment methods and different reuse plans enables the sharing of water treatment equipment, solves the problem of water shortage in steel companies, reduces the operating costs of steel companies, achieves sustainable development of water resources, and avoids serious environmental pollution problems and has important economic and social environmental benefits.

Description

Technical field [0001] The invention belongs to the technical field of recycling and utilization of urban reclaimed water and iron and steel production wastewater, and particularly relates to a system and process for combined classification and reuse of urban reclaimed water and iron and steel production wastewater for iron and steel enterprises. Background technique [0002] my country is a severely water-deficient country, with an annual per capita freshwater resource of about 2500m 3 , 1 / 4 of the world average per capita, ranking 109th in the world. The iron and steel industry is a major consumer of water and sewage in the industrial sector, second only to the power, textile, printing and dyeing and papermaking industries. Its water consumption accounts for about 14% of the country's total industrial water consumption, and its wastewater discharge accounts for about 12% of the total industrial drainage. At present, the water sources of iron and steel enterprises are mainly gro...

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Problems solved by technology

[0005] In order to solve the shortage of water resources in iron and steel enterprises and the increasingly prominent water environmental pollution problems, this invention proposes a system and process for the joint classification of urban reclaimed water and iron and steel production wastewater for reuse in iron and steel enterprises, using urban reclaimed water as a new alternative water source After graded treatment, it can be reused in iron and steel enterprises, and the industrial wastewater discharged from the steel production process can be reused in iron and steel enterprises after graded treatment

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