"Water treatment technology" refers to the process of removing substances from water that are not necessary for production and daily life through physical and chemical means. It is the process of settling, filtering, coagulation, flocculation, corrosion inhibition, scale inhibition, and other water quality conditioning that is carried out for specific purposes. Due to the close relationship between water treatment production, daily life, and water in society, the application scope in the field of water treatment is very extensive, constituting a huge industrial application.

The processing process of adding water treatment agents to raw water (raw water) to meet the water quality requirements of finished water (domestic or production water and wastewater for post-treatment).

When the processed raw water is used for domestic or industrial purposes, it is called water treatment; When processing wastewater, it is called wastewater treatment. The purpose of wastewater treatment is to discharge (discharge into water or land) or reuse wastewater.