sewage
…
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…The water flows in the tank where the chemical chlorine is added to kill bacteria. The chlorine is mostly eliminated as the bacteria are destroyed, but sometimes a neutralizing chemical must be added. This protests fish and wildlife which could be killed with a same amount of chlorine. The treated water is called effuent. This is discharged to a local river or the ocean. Like the Hudson, Harlem river an!
d East river
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