Wastewater biological treatment system and method therefor

A method of biological treatment comprising the steps of:

• (a) supplying effluent to at least one perforated distribution pipe;
• (b) discharging the effluent through the at least one perforated distribution pipe;
• (c) receiving the effluent in at least one perforated outer pipe surrounding the at least one distribution pipe and retaining the effluent therein for a period of time such that the effluent experiences biological treatment;
• and
• (d) passing the biologically treated effluent from the at least one perforated outer pipe to a wastewater drain field within which the at least one outer pipe is located.

A method of flushing a biological treatment system, comprising the steps of:

• (a) permanently positioning at least one perforated flushing pipe adapted to receive liquid within at least one outer pipe said outer pipe further having a distribution pipe for discharging effluent into said outer pipe and a gas delivery pipe for delivering gas to said outer pipe;
• (b) connecting a vacuum system to an end of the at least one outer pipe;
• (c) starting the vacuum system;
• and
• (d) supplying the liquid to the at least one flushing pipe such that the liquid is distributed within the at least one perforated flushing pipe and received by the outer pipe before being removed by the vacuum system.

A method of biological treatment comprising the steps of:

• (a) supplying effluent to at least one distribution pipe within an outer pipe positioned within a wastewater drain field;
• (b) delivering gas to the at least one outer pipe to interact with the effluent and retaining the effluent within the outer pipe such that the effluent experiences aerobic biological treatment;
• and
• (c) passing biologically treated effluent from the at least one outer pipe to the wastewater drain field.