Clarifying apparatus for biological waste water purification having an immersed trickling filter

TLDR: A rotatably driven immersed trickling filter (RBC) as discussed by the authors is a clarifying apparatus with bucket-like chambers that take up air during their circuit and release it at the bottom circuit region in order to take up liquid which trickles down onto the rotating biological contactor in the upper circuit region.

Abstract: A clarifying apparatus having a rotatably driven immersed trickling filter 5 (rotating biological contactor; RBC), which is only partly immersed in a water/activated sludge mixture, which immersed trickling filter is force-aerated by bucket-like chambers 3 circulating in an elevator-like manner, which chambers take up air during their circuit and release it at the bottom circuit region in order to take up liquid which trickles down onto the rotating biological contactor in the upper circuit region. Since the circulating chambers also serve as growth surface for microorganisms, oxygen is effectively fed to these outside the liquid with a residence time adjustable as desired.