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 must be sized according to your business needs and must have regular maintenance. Your liquid trade waste approval will specify these 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 waste that may affect the performance of treatment processes
Your liquid 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