There are several synonyms for the term "technology of purification" that can be used depending on the context. Some of the commonly used synonyms include water treatment, wastewater treatment, air purification, oil refining, and air filtration. These terms capture the different aspects of purification technology depending on whether it is related to water, air, or oil. Water treatment refers to the processes used to remove contaminants and impurities from water sources before it is used for drinking or other purposes. Wastewater treatment is the process of removing pollutants and contaminants from wastewater before it is discharged into the environment. Air purification is the process of removing impurities and toxins from the air in a given setting. Oil refining refers to the process of separating and purifying crude oil to produce different types of fuel and other products. Air filtration is the process of removing particles, bacteria, and other contaminants from the air in a given space, using filters or other technologies.