Discussion
Which biological wastewater treatment system consists of large diameter corrugated plastic media centered on a horizontal shaft and submerged 40% in wastewater ?
Answer: C
The system is the rotating biological contactor (printed 'contractors').
A rotating biological contactor consists of closely spaced discs of corrugated plastic, often 2 to 4 metres in diameter, mounted on a horizontal shaft and about 40 per cent submerged in the wastewater. As the shaft turns slowly, the biofilm on the discs is dipped in the wastewater to take up organic matter and then lifted into the air to take up oxygen.
A trickling filter is a fixed bed over which wastewater is sprayed, a sequencing batch reactor is a suspended-growth activated sludge system run in batches, and an in-vessel submerged system has its media fully immersed, not on a rotating shaft.
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