Calculate contribution of removal of phosphorous in primary settling tank to overall removal in wastewater treatment plant? Plant schematic is: Influent water→ Primary settling tank→ Biological aeration tank→ Secondary settling tank→ Effluent water.ParameterInfluent waterAfter settling (i.e. influent to aeration)Effluent waterPhosphorous7 mg/L6 mg/L5 mg/L

Calculate contribution of removal of phosphorous in primary settling t

1.	Calculate contribution of removal of phosphorous in primary settling tank to overall removal in wastewater treatment plant? Plant schematic is: Influent water→ Primary settling tank→ Biological aeration tank→ Secondary settling tank→ Effluent water.ParameterInfluent waterAfter settling (i.e. influent to aeration)Effluent waterPhosphorous7 mg/L6 mg/L5 mg/L
A.	40%
B.	45%
C.	50%
D.	52%
Answer» D. 52%

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