1. To convert the waste materials present in the sewage into stable oxidized end products that can be safely disposed of to inland waters without any adverse ecological effects.
2. To protect public health
3. To ensure wastewater is effectively disposed of on a regular and reliable basis without offence.
4. To recycle and recover the valuable components of the wastewater
5. To provide an economic method of disposal 6. To comply with legal standards and consent conditions placed on dischargers