To be absolutely clear on this . . . .
We dont use clarifiers on our systems. Only one Scarab system (see below) ever had one, and that's because the client insisted. And the client is always right. Right?
We explain clarifiers to our clients as being the funnel shaped vessel at the end of the plant, just before the disinfection. Its purpose is to allow any solid matter to settle out of the treated water and these collected solids will then be sent back to the start of the process, or discarded. Typical municipal type activated sludge process, will use this equipment extensively, and it's quite appropriate. And necessary.
I know of no other submerged fixed-film biological package plant, that does not come without this equipment. We also know that there are a few suppliers who include these clarifiers, to hide the fact that water quality is so poor, the semi-treated sewage is "cleared", giving the impression that all is well.
So, why don't we use clarifiers? Well, we dont need to. Our water quality comes out pretty darn good.
So, why don't we need clarifiers? I wont say. However, I will suggest that one day all the successful systems will be based on the Scarab technology. Its inevitable.
And when the next person asks me about our missing 'clarifiers', I will tell them to look here for the answers. It's crystal clear.
The only missing clarifier we have ever installed.