Chemical treatment—A process applied to water and wastewater in which chemical changes occur.
Physical treatment—A process applied to water and wastewater in which no chemical changes occur.
Physical-chemical treatment—A process applied to water and wastewater in which chemical changes may or may not occur.
Unit operations—Physical treatments that are identified only according to their functions without particular reference to the location of the units utilizing the functions.
Unit processes—Chemical (or biological) treatments that are identified only according to the functions of the chemical (or biological) reactions, irrespective of where the units utilizing the reactions are occurring.
Wastewater—The spent water after homes, commercial establishments, industries, public institutions, and similar entities have used their waters for various purposes.
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