Patent ID: 7022237

Claim:
A septic tank having side walls, a bottom, a top, an inlet port for receiving effluent, and an outlet port for discharging treated effluent, the septic tank comprising: a trash tank adapted to receive the effluent from the inlet port and process and break down the effluent into suspended solids and liquids such that they are partially digested by aerobic bacteria to form a separated sewage; a mix liquor compartment; a reservoir having a pump, an aeration device in communication with the pump, and a conduit extending from the aeration device to the mix liquor compartment, the reservoir being adapted to receive solids suspended in the liquids from the mix liquor compartment to resist accumulation of sludge in the mix liquor compartment, such that the pump circulates the liquids and suspended solids through the aeration device to thoroughly blend air into the liquids and suspended solids to produce oxygenated effluent; an apparatus adapted to deliver oxygenated effluent from the aeration device to the mix liquor compartment to facilitate the growth of aerobic bacteria therein, and significantly reduce the presence of sludge in the mix liquor compartment, such that a biological oxygen demand and total suspended solids in the treated effluent have been reduced to a level that is safe for discharge from the system; and a stilling compartment adapted to receive the treated effluent from the mix liquor compartment and settle out any heavy particles that remain in the liquids, and to allow the treated effluent to exit the system through the outlet port of the tank.