For employees of the TRILITY Group and Joint Ventures
TRILITY link
Reducing sludge handling costs
Rotorua Lakes Council engaged TRILITY to develop the design for the upgrade of the sludge dewatering building at the Rotorua wastewater treatment plant
(WWTP). Part of that design was a polymer dosing system, which was built in TRILITY’s Yatala workshop and shipped to New Zealand.
Since then, TRILITY has been awarded a 10-year operations contract for the Rotorua wastewater treatment plant and the new dewatering equipment
(including the polymer dosing system) will help the operations team achieve reduced sludge handling costs with less operator effort.
These works were initially part of a larger project to upgrade the WWTP. The larger upgrade is being reprogrammed to optimise the discharge and end user
requirements. The sludge dewatering and polymer dosing equipment were nearing the end of their life and resulting in a significant amount of operator effort to
ensure reliability justifying the fast-tracking of this portion of the larger project.
The new dewatering equipment has been sized to treat the sludge volumes produced in 25 years’ time at a higher dry solids content. This will assist the future
proofing of the WWTP as well as reducing sludge transportation costs. The TRILITY-built polymer system was sized for the ultimate sludge volumes and has
a significantly smaller footprint than the old system, which allowed the dry polymer handling system to be relocated from a transportable building into the
dewatering building.
These works are now entering the commissioning phase and will be completed by September 2021.
TRILITY and the Rotorua Lakes Council have worked together to deliver the upgrade of the dewatering building as part of a larger goal to process the
community’s wastewater in a cost-effective and reliable manner.
For more information please contact Steve Jamieson, New Zealand Steve.Jamieson@trility.co.nz
Batching tank
Poly dosing system
Poly dosing skid