Patent ID: 6974536

Claim:
A wastewater treatment apparatus comprising: a recirculation chamber; a dosing chamber having no direct fluid connection to the recirculation chamber, and separated therefrom by a substantially vertical chamber wall; a filter layer containing a filter media and being located atop the recirculation and dosing chambers and the substantially vertical chamber wall, the recirculation chamber, the dosing chamber, and the filter layer being located in a single tank; an influent pipe that directs wastewater entering the wastewater treatment apparatus into the recirculation chamber; a recirculation pump located in the recirculation chamber, the recirculation pump pumping the wastewater from the recirculation chamber onto the filter layer; a porous filter underdrain, the wastewater treatment apparatus being configured such that the wastewater flowing through the filter media of the filter layer is directed through the underdrain and is then directed simultaneously into the recirculation chamber and the dosing chamber by gravity; a septic tank return pipe connected to the dosing chamber, a portion of the wastewater being discharged from the wastewater treatment apparatus through the septic tank return pipe back to a septic tank for additional treatment; and an effluent discharge pipe connected to the dosing chamber, the wastewater being discharged from the wastewater treatment apparatus through the effluent discharge pipe for final disposal.