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The Facilities |
Odor Control, Reclaimed Water, BiosolidsOdor ControlKing County is committed to operating the Brightwater Treatment Plant with no detectable odors at the property line. To this end, stringent design and performance criteria have been established for odor prevention at the facility. See how Brightwater's odor control compares to other treatment plants. To remove odors, air will be collected from the covered process units, enclosed buildings, and loading areas and will then be routed to the odor control systems. All process units will be covered, including the influent wet well, screenings and grit handling, primary clarifiers, aeration basins, membrane tanks, and disinfection. Buildings such as headworks and solids handling equipment would be fully enclosed. Air from these enclosed facilities will then be treated by multistage chemical and biological scrubbers followed by a final polishing stage of carbon adsorption. Each stage treats the process air to a greater degree. The exhaust air from the carbon polishers would be discharged from stacks. Reclaimed WaterWashington state identifies standards for four classes of reclaimed water, with Class A being the most stringent standard. Class A reclaimed water can be used for non-potable industrial processes irrigation of food and non-food crops, and irrigation of open access areas (e.g. parks). It is proposed that Class A reclaimed water will be produced at Brightwater for reuse. Initially, a 5 mgd reuse facility will be provided. Space will be reserved onsite for additional water reclamation (reuse) facilities up to the AWWF projected for buildout (54 mgd). The reclaimed water will be used on-site for irrigation, tank cleaning, and other processes that do not require potable water. The reuse water may additionally be distributed off-site. A reuse pump station will be located on-site and will pump the water to the distribution system. The reuse process tanks would be covered and vented to the secondary odor control system. >>> Learn about the MBR process being used at Brighwater to treat wastewater BiosolidsBiosolids are the nutrient-rich organic material produced by treating wastewater solids. After processing and treatment, they can be beneficially recycled as a fertilizer and soil amendment. Biosolids have been recycled safely by King County for more than 25 years. In 2002, 27,000 dry tons of biosolids from the county's two treatment plants were used for agriculture and forestry applications, and a portion was composted for use in landscaping and gardening. Biosolids production will include thickening, anaerobic digestion and dewatering processes. The stabilized, dewatered biosolids would be hauled offsite and beneficially used along with biosolids from the West Point and South Treatment Plants. The biosolids facilities would have odor control systems. |
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Contact us if you need more information about Brightwater. King County Brightwater Project 22505 State Route 9
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King County | Natural Resources & Parks | Wastewater Treatment Division links to external sites do not constitute endorsements by King County. |
