The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by?

Biological oxygen pond
Aerated lagoons
Trickling filters
Gravity separator having oil skimming devices

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

AhmedNazir

Answer: Option 4

5 views Answered 2022-09-01 13:21

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