• Clearwater Digester Gas-to-Electricity Cogeneration Facility

    Project involved installation of new covers over the Pickett Thickeners and primary clarifiers; new odor control unit and associated valves, piping and fittings along with electrical and control upgrades; installation of a new centrifuge, removal belt filter presses, refurbish one filter press as backup, converted an elevator shaft into a storage room; installation of two new polymer systems

Owner
City of Clearwater
Engineer
Siemens Water Technologies
Contract Amount
$3,142,936
Project Delivery
Design-Build
Lost Time Incidents
0

Project Details

Project involved installation of new covers over the Pickett Thickeners and primary clarifiers; new odor control unit and associated valves, piping and fittings along with electrical and control upgrades; installation of a new centrifuge, removal belt filter presses, refurbish one filter press as backup, converted an elevator shaft into a storage room; installation of two new polymer systems and upgrading the existing Velodyne polymer

system; refurbish the belt conveyors and upgrades to associated valves, piping and fittings along with electrical and control upgrades; installation of a FOG (fat, oil and grease) receiving and storage system which included a fuel conditioning system, a co-generator, connecting the co-generator to the existing power grid within the WRF and all associated valves, piping and fittings along with electrical and controls upgrades; removal and replacement of 32 mixers in the fermentation, first anoxic and second anoxic tanks along with associated electrical upgrades.

This was a design/build project that involved installation of a gas conditioning system that consisted of a hydrogen sulfide removal inlet moisture/particulate filter, hydrogen sulfide removal media vessel, compression/moisture removal skid, glycol chiller skid and a remote mounted electrical control panel. The gas first enters through a hydrogen sulfide inlet moisture/particulate filter and then goes into the hydrogen sulfide removal vessel. After the hydrogen sulfide is removed from the gas it continues through to a blower inlet moisture/particulate filter before entering the rotary lobe blower where the gas compresses to 11.5psig, then through a dual core heat exchanger. The heat exchanger uses the hot gas from compression to reheat the cold gas which uses chilled glycol to cool the gas to 40ºF. After the gas is chilled it is reheated to 80ºF. After the gas drying stage the gas is sent to the siloxane removal vessels. After the siloxanes are removed the gas goes through a final particulate filter to finally be delivered to the end use equipment.

In addition to the above TLC also installed new aluminum covers over the Pickett Thickeners and primary clarifiers; install of a new odor control unit and associated valves, piping and fittings; installation of a new centrifuge, removal of belt filter presses and refurbish one existing filter press as backup; installation of two new polymer systems and upgrading the existing Velodyne polymer system; refurbish the belt conveyors and upgrades to associated valves, piping and fittings along with electrical and instrumentation upgrades.