Hamilton City Council WWTP Digester
Cogeneration from digester gas
Entec Services installed and commissioned a Waukesha VHP2900G cogeneration package at the Council's Pukete Road wastewater treatment plant in 1985. This unit operates on digester gas, and is rated for a continuous output of 230kWe. Engine controls and electrical switchgear were supplied by Schneider.
The Waukesha engine achieved in excess of 50,000 hours before a cylinder head overhaul was required. This unit is fitted with a data logger, which shows the system availability to be in excess of 98%. The system operated for a total of some 110,000 Hours before the unit was sold to the Tauranga City Council for use at the Chapel Street Waste Water Treatment plant.
2011 and ongoing (Spiire NZ) - Digester performance assessment and design/construction/commissioning of a digester system upgrade that will increase the digesters capacity to cater for the increasing loading of the plant by upgrading of the mixing system and addition of recuperative sludge thickening.