As part of the Wastewater Treatment Plant rationalisation program rolled out by Taswater the aging treatment plant at Taroona in the southern suburbs of Hobart was replaced by a pumping station designed to pump the sewage further north to a more efficient treatment plant.
Netco Pumps were asked to supply and install the new pumping station which comprised of a 3200mm diameter x 6 metre deep concrete wet well along with 230,000 litres of offline storage in case of power or station failure.
The storage was relatively complex as the site was adjacent to the coastline with a pedestrian walking trail running beside it. The geography of the block was very steep and constrained with the added demand of needing to retain the treatment plant whilst the station was built and commissioned.
The storage was completed as 2 x large cylindrical fibreglass tanks, each 3500mm diameter x 15 metres long, these had to be buried with sufficient depth to allow a concrete road to be constructed on top which would allow service trucks to the site. The tanks were also fitted with an automatic washdown system which would wash the tanks in series if the level of the sewage pump station climbed above the overflow level.
Whilst being a standard bread and butter type of undertaking for Netco Pumps, the difficult site, space constraints and additional storage were all interesting aspects of an otherwise regular project.