Types of On-Site Sewerage Systems
Treatment systems for household wastewater include:
Conventional domestic sewage treatment plants (secondary treatment or better)
- Activated sludge system
- Biological trickling filter system
- Extended aeration system
- Aerated/aerobic sand filter system
- Effluent may be disposed of via trenches, surface or subsurface irrigation
Septic tanks (primary treatment)
- All-waste septic tank (all household wastewater)
- Black water septic tank (toilet, urinal and bidet wastewater only)
- Greywater septic tank (sullage wastewater only)
- Effluent may be disposed of via trenches only
- Dry vault system (toilet waste only – waterless)
- Wet system (all household wastewater – may be considered a domestic sewage treatment plant)
- Off the premises by collection from a holding tank by a Council approved liquid waste carrier
- Greywater treatment/diversion facility.
Although Council approves the installation of an on-site sewerage facility, the treatment system will require product approval from a State Government Department.
Aerated wastewater treatment systems
A permit to install an aerated wastewater treatment system shall only be granted on the condition that the householder has the installation inspected as per the model approval requirements by a Servicing Agent.
A report shall be prepared after each inspection with a copy to be retained by the householder and another to be forwarded to Council.
The Servicing Agent must be engaged to carry out any necessary repair work to the installation as well as the routine cleaning and maintenance activities. Any installation faults revealed in an inspection must be repaired promptly.