Abstract: A self-cleaning ultraviolet wastewater disinfection unit and method are provided. The disinfection unit has a wastewater treatment chamber comprising a UV lamp for treating/disinfecting the wastewater. A plurality of pieces of media may be positioned in the treatment chamber. When wastewater is present in the chamber, gas is injected into the wastewater through a gas inlet conduit. The gas agitates the pieces of media in the wastewater to cause the pieces of media to rub against the UV lamp unit to remove matter that has accumulated on the UV lamp unit. The removal of accumulated matter on the UV lamp and other surfaces in the chamber may improve the efficiency and effectiveness of the disinfecting unit. Furthermore, the cleaning operation may be performed automatically at scheduled periods to increase the time between major cleanings of the unit.

Abstract: A turbine that has a plurality of compartments. Each compartment has associated thereto a respective opening. Each opening defining a fluid communication path between an outside of the turbine and a respective compartment. The turbine also has a plurality of conduits. Each conduit connects a respective compartment to an adjoining compartment. Each conduit defines a fluid communication passageway between the respective compartment and the adjoining compartment. The turbine is configured for immersion in liquid and for powering by gas displacing some of the liquid out of one or more than one compartment. The present disclosure also describes a method of driving such a turbine.

Abstract: A separator and composting unit for a sewage treatment system. The separator and composting unit receives sewage at a rotating separator that drains, or partially drains, the sewage of its liquid. The separator transfer the partially drained sewage to a rotating composting drum wherein the partially drained sewage dries out and transforms to compost while on its way to an exit opening of the composting drum from which it falls out.