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Arial view of the plant

Reducing greenhouse gases and improving efficiency in NZ

The Rosedale wastewater treatment plant in Auckland currently has capacity to process wastewater from a population of 240,000.

ClientWatercare Services Limited Offices
ExpertiseConcept and detailed design

Opportunity

It was designed to be expanded to serve a population of up to 320,000 and peak flows of up to 4m³/s. We are acting as the principal engineer for the upgrade, which includes expansion of the primary tanks, odour control equipment, modified Ludzack- Ettinger bioreactor, digester, UV disinfection and associated electrical infrastructure.

Solution

We have designed a new digester with interface to a new gas engine and flare, which adds sludge retention time to the anaerobic digestion process, providing more resilience. It has the added benefit of reducing greenhouse gases and improving the yield of biogas, a by-product of the wastewater treatment process which is used to power engines that currently meet more than half the electricity needs of the plant and a sister facility.

Outcome

More advanced technologies have been incorporated as well as a reconfiguration to futureproof the entire digestion process. We are assisting with the integration of sustainable practices which will help Watercare achieve its goal of running the plant on 100% self-generated electricity by 2025, a target that will see it reduce its electricity demand on the grid by approximately 37GWh every year.

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