A kitchen waste bin having a casing; a lid hingedly attached to the casing and moveable between open and closed positions. The lid includes an outer casing, an inner casing and a cavity there between. The inner casing having one or more apertures communicating between the cavity and the interior of the receptacle when the lid is closed; an ozone generator located within the cavity arranged to discharge ozone into the receptacle where the ozone generator is an ultraviolet source that includes an elongate lamp in an elongate channel shaped reflector; a switch that generates and transmits a control signal when the lid is moved; and a control unit arranged to switch the ozone generator on or off in response to a control signal. Ozone is discharged into the receptacle for a sterilization period when the lid is closed. Discharge of the ozone stops when the lid is opened.