The King County Wastewater Treatment Division in Seattle, Washington, is expanding its wastewater system to include a new regional wastewater treatment facility (Brightwater) in adjacent Snohomish County. The expansion includes significant conveyance improvements close to residential
and commercial neighbors. King County's “no detectable odors” standard required a high level of odor treatment for these improvements. A chemical injection facility was designed for the Hollywood Pump Station to address corrosion in the existing conveyance system, while a
two-stage bioscrubber and existing carbon scrubber system at the North Creek Facility were designed to address possible odor releases at hydraulic structures. A symbiotic approach was required from the initial planning study through design, construction and operation of the two facilities
to minimize odors and corrosion while minimizing operating costs.
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