Final answer:
The five steps used in water and wastewater treatment calculations are pretreatment, primary treatment, secondary treatment, tertiary treatment, and disinfection and discharge.
Explanation:
Pretreatment: Initial removal of large debris like sand and gravel.
Primary treatment: Separation of organic solids, fat, and grease using settling or floatation.
Secondary treatment: Aerobic bacterial decomposition of organic solids.
Tertiary treatment: Bacterial decomposition of nutrients and filtration.
Disinfection and discharge: Treatment with chlorine, ozone, ultraviolet light, or bleach, and either discharge to surface waters or reuse for irrigation or other purposes.
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