Zero-emission process method for treating and recycling comprehensive wastewater in iron and steel industry

Abstract

In view of the problem that the oil content, suspended solid content, salt content and organic matter content of the steel industry wastewater are high, a combined process involving a grid, an oil separation grit chamber, a primary sedimentation tank, a biological contact oxidation tank, an efficient sedimentation tank, a V-shaped filter tank, an ultraviolet disinfection tank, a siphon filter tank, ultrafiltration and two-stage reverse osmosis is adopted, so that pollutants in the wastewater can be effectively degraded, the wastewater reuse rate can be increased, the use amount of new water inthe iron and steel industry is reduced, the investment cost of an enterprise is saved, and remarkable environmental benefits and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and resource recycling, and in particular relates to the resource recycling of waste water discharged by iron and steel enterprises. Background technique [0002] In the entire industrial field, the iron and steel industry is the pillar industry of my country's economy. At the same time, the water consumption of iron and steel enterprises also ranks in the forefront of various industries, about the fifth. As a country with severe shortage of water resources, all walks of life in our country are actively taking the responsibility of saving water and reducing emissions. Similarly, iron and steel enterprises are among them, but as large water users, iron and steel enterprises face huge challenges and difficulties in terms of new water consumption and wastewater discharge. [0003] The pollution of iron and steel wastewater is mainly manifested in the high content of suspended solids an...

AI Technical Summary

Problems solved by technology

Although the existing treatment process can handle wastewater from the iron and steel industry, the operation is unstable, some water quality indicators are not up to standard, and the membrane cleaning cycle is shortened. Therefore, there is still room for improvement in terms of process flow, treatment effect and treatment cost.

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