With the continuous development of society, the development model of low-carbon economy has been paid attention to, and the prominent features of the steel industry are high energy consumption and large emissions. Therefore, it is not compatible with the low-carbon economy with the concept of saving. The development of China's steel industry plays a pivotal role in the world. The steel industry wastewater mainly contains SS, oil, saline, alkali, COD and other pollutants. It has the characteristics of high chroma, large concentration of major pollutants, unstable water quality and more oil slick. Steel industry wastewater treatment should take different sewage treatment equipment for different water quality. 70% of steel wastewater is sewage from turbid circulating cooling water system, such as blast furnace gas washing water, slag wastewater, converter dust removal wastewater, continuous casting machine wastewater.

For the wastewater treatment of the steel industry, it is necessary to pay attention to the change of concept, and focus the governance on the main source. That is to say, it is necessary to base itself on the overall industrial situation, adjust the process, and gradually abandon those backward technologies with high energy consumption and serious pollution. The application can realize the process of maximizing resource utilization and effectively reduce pollutant emissions.