The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by Options: A . &nbspBiological oxygen pond B . &nbspAerated lagoons C . &nbspTrickling filters D . &nbspGravity separator having oil skimming devices

The main pollutant in waste water discharged from a petroleum refinery is oil (b

Question

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

Options:

A . Biological oxygen pond

B . Aerated lagoons

C . Trickling filters

D . Gravity separator having oil skimming devices

Answer: Option D

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