What statement is true concerning the polishing coalescer filter of an oily-water separator?

Correct Answer: Option D — The coalescing filter is typically an oleophilic filter meaning that small droplets of entrained oil of the oily-water mixture coalesce on the filter and form large globules of oil that rise to the top of the filter housing.

Oily-water separators utilize oleophilic (oil-attracting) coalescing filters to capture small oil droplets. These droplets adhere to the filter media, merging into larger globules. Due to their lower density compared to water, these coalesced oil globules rise to the top of the filter housing for subsequent removal and discharge.