Question

1. Given below are five steps in treating wastewater. Number them in the order in
which they are done.
*Air is mixed vigorously into tanks with wastewater effluent._________
*Chlorine or bleach is added to the wastewater effluent._______
*Sand and grit are removed from the wastewater effluent._______
*Bacteria are settled out of the wastewater effluent_______
*Oil and grease float to the top of the wastewater effluent._____

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Answer 1

Answer:

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