Exeter township was scheduled to upgrade their antiquated, press-based dewatering technology to a modern, high speed horizontal centrifuge in 2008 as part of their wastewater plant upgrade. After successfully using an Alfa Laval-equipped P&H Senesac dewatering system for a pilot test, they proceeded forward with construction in 2010. However, they would need a temporary dewatering solution during the upgrade.
The P&H Solution
P&H was able to supply a Spartan temporary dewatering unit In June, 2010. P&H personnel set up and operated the centrifuge for a week in order to effectively demonstrate that the system could handle the flow rate from the digesters. After stabilizing and optimizing the process, P&H proceeded with training the plant’s personnel on basic centrifuge operations, process optimization, and troubleshooting procedures. We provided customized operating documentation including basic start-up and shut down procedures, troubleshooting sheets, and optimization guidelines. After they took over the operation for the next three months, P&H provided technical and on-call customer support, even responding to calls on Sunday nights.
Four years later, Exeter awarded P&H Senesac a contract to clean out both of their digesters. From October 22-December 5, P&H successfully dewatered 135 dry tons of biosolids out of two digesters that had not been cleaned out in 15 years.