The Rosedale wastewater treatment plant (WWTP) serves about 17% of Aucklanders and is the region’s second largest. A programme of upgrades to the facility, will raise capacity by a third, enough to treat waste from 320,000 people, with peak flows of up to 4m3/s. Our original design included primary sedimentation and a modified activated sludge plant to increase liquid stream capacity as well as a new digester to improve the anaerobic digestion process. We have since developed the design for a thermal hydrolysis plant with partners Stantec. The upgrades to Rosedale will improve its resilience, reduce waste solids and greenhouse gases, and raise biogas yield to help power the plant.
Underpinning Auckland's growth
Underpinning Auckland's growth