en.Wedoany.com Reported - New Zealand water utility Watercare has signed a contract with Norway's Cambi to introduce two thermal hydrolysis process systems for the upgrade project of its Rosedale wastewater treatment plant in Auckland. The project, with an investment of NZ$28 million, is scheduled to commence operations in 2028.

This thermal hydrolysis system uses high temperature and high pressure to treat sludge generated during the wastewater treatment process. It is part of a broader upgrade plan for the Rosedale wastewater treatment plant, aimed at addressing the growing wastewater treatment demands in northern Auckland. Rob Burchell, Watercare's Project Director, stated that Cambi is a leading global supplier of thermal hydrolysis systems and expressed delight in bringing this technology to the plant.

Currently, the Rosedale wastewater treatment plant is equipped with four digestion tanks. Burchell noted that approximately a decade from now, when the Northern Interceptor wastewater pipeline is fully operational, the wastewater flow into the plant will nearly double. The thermal hydrolysis technology can reduce the volume of digested solids, allowing the plant to handle the increased flow without the need for new digestion tanks. Additionally, the pasteurized biosolids produced by this process can be used as fertilizer.

The technology is also expected to increase biogas production, supporting emission reduction and renewable energy utilization in operations. The increased biogas volume will provide sufficient electricity to support plant operations and may even allow for the transmission of some power to the grid. Once the system installation is complete, Rosedale will become the largest thermal hydrolysis facility in the country.

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