Waste water treatment system

Abstract

A biological waste treatment assembly used between a septic tank and a drain field. There is an upper chamber containing a trickle media bed for aerobic treatment of the effluent, and a sump positioned beneath this. The fresh effluent from the septic tank drains into the sump, and is drawn from this and pumped upwardly through a conduit by a submersible pump. Compressed air is introduced at the base of the conduit so as to aerate the effluent. The conduit is formed of UV-transparent tubing, and this is helically coiled around an ultraviolet light source which serves to destroy fecal colliform bacteria in the effluent. The effluent is then discharged via a spray nozzle onto the upper surface of the aerobic treatment bed, and migrates downwardly through this to a collection pan. A down tube drains the collected effluent directly to a relatively oxygen-free layer in the sump, where secondary anaerobic treatment serves to denitrify the products of the aerobic treatment in the upper chamber.

Dependencies are inferred from the claim text.