Where a business has a complex or non standard waste stream a Trade Waste Officer needs to undertake a site assessment to determine if the waste stream is acceptable for discharge to the sewer and to identify the type of pre-treatment equipment that is to be installed.
| Business Type | Process and discharge characteristics | Pre-treatment equipment required |
|---|---|---|
| Auto dismantlers, car detailers, mechanical workshops, small engine repairers, vehicle washing | Grease, oil, suspended solids, metals, petroleum hydrocarbons, kerosene, detergents | Corrugated plate interceptor, vertical gravity separator, hydro cyclone, settling pit, silt pit. |
| Butcher, bakery, cafeteria, canteen, caterer, commercial kitchen, club, childcare, fast food outlet, fish and chip shop, hospital kitchen, hotel kitchen, motel kitchen, restaurant, school home science, take away shops etc. | BOD, suspended solids, grease from food preparation, cooking and cleaning processes | Dry basket arrestor in floor waste. Basket trap in sink drains. Grease arrestor minimum capacity of 1000 litres. Large sites will require a site visit from a Trade Waste Officer. |
| Health related industries, dental surgery, dental technician, doctors’ surgery etc. | Amalgam, mercury, silver, plaster casts, suspended solids, x-rays | Amalgam separator, plaster arrestor, Industry Code of Practice, Photographic Uniform Regulations for the Environment (Pure) |
| Commercial laundry, coin operated laundry, dry cleaners | Lint, high temperature, high pH | Lint traps, cooling pit, pH correction |
| Photographic processing and developing, x-ray, graphic arts | Silver and ammonia | PURE Industry Code of Practice. Spent fixer and developer is not to be discharged to sewer and must be collected by a licensed liquid waste transporter. |
Application Process
Under the Water Supply and Sewerage Services Act a permit is required for any business seeking to discharge trade waste to Power and Water’s sewerage system. A Trade Waste Application form can be found here.
A Trade Waste Discharge Permit or agreement cannot be issued unless an application has been received and approved.
For more information about Trade Waste Discharge Permits contact Power and Water Trade Waste team.
