Although China's urban sewage treatment plants have exceeded 100 million cubic meters per day, they still need to raise the banner of industrial wastewater treatment. It is understood that industrial water accounts for 35% of the water usage, especially for some high consumption industrial enterprises. Data shows that its water intake exceeds 50% of the country's total industrial water intake, such as steel, petroleum, petrochemical, chemical, paper, textile, non-ferrous metals, food and other industries.

The complex composition should be a prominent feature of industrial wastewater. The wastewater generated by different high water consuming industries is also different, and even the wastewater generated by different processes in the same industry is different. Some of them are toxic, harmful, and corrosive. If not handled properly, it will affect the environment, personnel, etc. Causing damage. Therefore, achieving "zero emissions" and harmless treatment of industrial wastewater has become the dominant direction of industrial water treatment.

The draft of the Resource Tax Law of the People's Republic of China will clearly implement the collection of water resource tax, and then implement the collection of water resource tax on units and individuals who use it. The main reason is to force high water consuming enterprises to save water and improve water efficiency. In this way, improving water-saving technology and increasing the reuse rate of water have been put on the agenda of industrial wastewater treatment.

On this basis, the Ministry of Industry and Information Technology recently released the "Catalogue of Industrial Water saving Processes, Technologies, and Equipment Encouraged by the State (2019)", which includes more than 90 water-saving processes, technologies, and equipment in 12 projects. More than half of the wastewater related to industry is recycled and reused.