Anaerobic/aerobic filter plant

A biological filter for use between a septic tank and a drain field for treating a septic tank effluent comprising:

• a filter tank having aerobic treatment means and anaerobic treatment means therein, said aerobic treatment means being located above said anaerobic treatment means, and including a holding well and a circulation well having connection means therebetween for providing fluid outflow from said holding well when the fluid reaches a predetermined level in said holding well;
• an influent line for receiving the effluent from the septic tank;
• an influent manifold disposed under said anaerobic treatment means adjacent the bottom of said system tank and connected to said influent line for infusing said anaerobic treatment means with the effluent;
• a collection manifold disposed between said anaerobic treatment means and said aerobic treatment means for collecting the effluent after same has passed through both of said treatment means, said collection manifold having an outflow line into said holding well;
• dispersal means for simultaneously from said circulation well, dispersing a portion of the effluent to said aerobic treatment means while dispersing the remaining effluent to said anaerobic treatment means;
• and
• a circulation and connected to said dispersal means pump located in said circulation well for selectively pumping the effluent to said dispersal means and the drain field.

In a septic tank system, a biological filter for use between a septic tank and a drain field, including means for connecting the biological filter to the septic tank and drain field, comprising:

• a filter tank, including an influent line from the septic tank, said filter having anaerobic treatment means for treating, anaerobically, septic tank effluent and aerobic treatment means for treating, aerobically, septic tank effluent, wherein said anaerobic treatment means is located in the bottom of said filter tank and said aerobic treatment means is located above said anaerobic treatment means;
• a holding well for receiving fluid from said filter tank including connection means for providing fluid outflow from said holding well when the fluid reaches a predetermined level in said holding well;
• a collection manifold located between said anaerobic treatment means and said aerobic treatment means, said collection manifold having a drain therefor located in said holding well;
• and
• a circulation well for receiving fluid from said connection means, including a circulation pump means for pumping the fluid selectively into said anaerobic treatment means, said aerobic treatment means, and the drain field.