RFS^III Finished Product.

Wastewater flows by gravity from the home to the septic tank.  Inside the septic tank, which is situated as close to the waste producing source as possible, the settable solids fall to the bottom of the tank where they decompose anaerobically to form a sludge layer.  The lighter less dense material mainly composed of fats, oils, and greases floats to the top of the water and creates a scum layer.  Effluent from the relatively clear zone of the septic tank, between the scum and the sludge layers, enters the effluent filter through inlet holes.  Effluent then enters the annular space between the housing and the filter tubes.  Particles larger than 1/8” are detained in the annular space, where decomposition of the organic material occurs.

 The filtered septic tank effluent then flows by gravity to the recirculation tank bottom zone.  The recirculation pump in the bottom zone pumps the effluent via a spray grid onto a sand filter.  The effluent trickles down the filtrate media where it is treated by naturally occurring micro-organisms populating the sand filter. After passing through the biological filter media, the treated effluent is stored in the bottom zone where it is mixed with incoming septic tank effluent.  The mixing of septic tank effluent with biologically filtered effluent creates a dilute waste to be recirculated through the sand filter.  The treated effluent is discharged either by gravity or a small discharge pump to disinfection and/or discharge.

Key Benefits

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Last modified: February 13, 2004