Do you know the difference between "drainage" and "wastewater"? An explanation of the basics of factory wastewater treatment and drainage treatment.

■What is the difference between drainage and wastewater? "Drainage" refers to the act of discharging water outside or the water that has been discharged. On the other hand, "wastewater" specifically refers to the dirty water that has been used. The key distinction between these two terms is that wastewater is in a dirty state due to treatment, while drainage water is not necessarily dirty. ■How does wastewater treatment create "clean water"? In production sites, various types of wastewater, such as polishing wastewater and cutting fluid wastewater, are generated. Wastewater treatment involves separating these wastewaters into clean water and contaminants through processes like coagulation treatment. In coagulation treatment, a coagulant is added to the fine particles of contaminants to cause them to clump together into larger masses, which are then removed through sedimentation and filtration. The cleaned water from wastewater treatment may be reused in the production site, but since treated water contains some chemical components, careful consideration should be given to whether it can be reused. ■Why are wastewater treatment and discharge standards necessary? Wastewater treatment is the process of treating wastewater to discharge water outside the factory. The discharge standards vary depending on the components contained in the wastewater. These standards are established to protect public water bodies such as rivers and seas, as well as groundwater, from pollution and to preserve the living environment.

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