Waste water goes through a long process before it is released back into the water system. The process Is so long and exact because the untreated sewage water is very toxic. The process i am about to describe begins when the water is already at the treatment plant.
Step1.Coarse solids are screened out of the water (i.e. rocks, plastic) and grit (i.e. gravel) these materials are sent to landfills
Step2. Primary treatment ; waste water is screened and processes are preformed to remove crude soils and skims of grease, oils and fats
Step3. The water is put into settling tanks for several hours. During this time the heavy solids fall to the bottom of the tank. This substance is know as primary sludge.
Step4. The material that stays at the surface of the water is removed
Step5. The sludge and materials removed from the surface are most typically pumped or trucked to a solid treatment processing plant.
Step6. Than the water goes through biological treatment were the water is treated using bacteria
Step7. The water is clarified by separating treated water from bacteria cells using gravity.
Step8. The bacteria and waste is sent to separate solid treatment facilities or treated on site.
Step9. The water is further treated by removing nitrogen, phosphorus, and any other harmful substances that may be left in the water such as disease causing organisms and viruses.
Step10. The water i exported to were it is needed.
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