Patent ID: 11878923
Assignee: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 8:
9. A method of biologically treating wastewater comprising:
directing the wastewater to be treated into a tank and into a rotating drum having a perforated wall and disposed in the tank;
containing biofilm carriers in the rotating drum, the biofilm carriers occupying a volume of from 30% to 80% of the internal volume of the rotating drum;
rotating the drum and contacting the biofilm carriers with the wastewater in the drum to biologically treat the wastewater therein;
aerating the wastewater in the drum by employing a plurality of tubes having orifices therein and secured to the wall inside the drum;
as the drum rotates, filling the tubes passing through an air space above a surface of the wastewater in the drum with air, and thereafter submerging the tubes containing the air in the wastewater in the drum causing the air in the tubes to pass into the wastewater in the drum and in the process filling the tubes with wastewater as the tubes move through the wastewater in the drum; and
directing treated wastewater from the drum and out a treated wastewater outlet in the drum.