Cassowary Coast Regional Council

Sewerage Treatment Sewerage Treatment

Frequently Asked Questions

What not to flush

Application for Permission to Carry Out Alternations to Sewer/Water Mains  or Sewerage Connection/Disconnection

Building Over or Near Relevant Infrastructure

Sewerage Treatment Plants

Council owns and operates two sewerage treatment plants – one in Innisfail (Coquette Point Road) and one in Tully (Wildsoet Street).

Innisfail plant (tertiary treatment): This plant includes inlet works with screening and grit removal, a folded carousel oxidation ditch bio-reactor process, two separate final circular clarification tanks and UV (ultra violet) for disinfection before discharge. Chemicals used in the process include liquid alum to help with the removal of phosphorus and liquid caustic soda for pH correction.  The  plant sludge thickening and dewatering process uses a combined gravity drainage deck / belt filter press unit. Features of this plant include a three-storey operations building with a fully-equipped lab and operations offices where staff can closely monitor plant processes. The plant also contains a large odour extraction and treatment facility that eliminates any odour produced from the plant.

Tully plant (tertiary treatment): The plant includes an inlet structure that contains primary screens, bio reactor oxidation ditch in a circular configuration with an internal final clarification tank and UV used for disinfection before discharge.  The chemicals used in this process are liquid alum for the removal of phosphorus and powered lime for pH correction. The sludge thickening process utilises a belt filter press arrangement.  Features of this plant include a multi function control room that also monitors the operation and performance of sewerage pumps station network put to mission beach.

The Innisfail and Tully plants are required to conform with licences that are issued by the Department of Environment and Heritage Protection (DEHP) and councils operations and environment staff sample and monitor the plant discharge and receiving environment to ensure compliance.

For any further enquiries or for organisation of educational tours e.g. school visits, please contact Council's Customer Service department on 1300 763 903.

On-site sewerage (septic tanks):  On-site sewerage facilities (septic tanks) are necessary in unsewered areas to provide wastewater treatment and disposal of effluent by land application. When functioning correctly, these facilities provide an effective cost-efficient sewerage treatment system. However, poorly-designed and maintained treatment and land applications may contribute to the pollution of ground water and surface water.

The householder is obligated to operate and maintain the on-site sewerage facility to achieve performance standards and criteria for effluent quality and impact on the environment.

The design, installation and maintenance of septic tanks and absorption trenches needs to comply with the Department of Environmental Management's Code of Practice for On Site Sewerage Systems and the Australian Standards AS/NZS 1547,2000 On-Site Domestic Wastewater Management and AS 1546 Part 1 Septic Tanks and Part 3 Aerated Wastewater Systems.

Property owners need Council approval before installing new on-site sewerage facilities.

Sewerage Scheme: Chemicals and similar substances should not be discharged into the sewer. If there is a sewer blockage, it is the responsibility of the property owner to ring a private plumber first.

Trade Waste: Trade waste is a liquid discharge containing trade or factory wastes, chemicals or other impurities from any business, trade or manufacturing premises.

Cassowary Coast Regional Council issues a Permit to Discharge Trade Waste to the sewer so it can control the amount and type of trade waste being discharged into the sewerage system.

It is an offence under the Water Supply (Safety and Reliability) Act 2008 and the Local Government Act 1993 to discharge trade waste to the sewer without a Trade Waste Permit.

For more information, see the Trade Waste page.