A wastewater treatment system and process utilizing a trickling filter with a rotary distributor extending thereover for the distribution of wastewater over the filtering medium. A sealed insulating dome overlays the filter to provide a closed environment. An underdrain system extends underneath the...http://www.google.com.au/patents/US4486310?utm_source=gb-gplus-sharePatent US4486310 - Wastewater trickling filter air recirculation process
