To protect Council’s sewerage transport and treatment systems most liquid trade waste needs to be pre-treated before it is discharged.
Typical pre-treatment processes and equipment include:
- exclusion of solid waste – sink and floor drain screening
- retention of grease and fat – grease arrestor
- separation of hydrocarbon oil – oil separator
- correction of discharge temperature – cooling pit.
More complex pre-treatment processes such as pH adjustment and biological treatment are required for some high-risk liquid trade waste streams.
Pre-treatment systems need regular maintenance. Your trade waste approval will specify the requirements.
You must not discharge the following into the sewerage system or your pre-treatment system:
- Used cooking oil
- Rain water
- Some chemicals
- Any type of liquid waste that may affect the performance of pre-treatment processes.
Your trade waste approval will identify substances that must not be included in your liquid trade waste stream.
Plumbing approval is required for installing liquid trade waste pre-treatment equipment, apart from replacing sink and floor drain screening.
To apply for plumbing approval see Plumbing and Drainage application