Workers at King County’s West Point Treatment Plant continue to be on schedule for restoring the wastewater treatment processes by April 30.
The work to restore wastewater treatment processes at the West Point Treatment Plant by April 30 continues to be on schedule at the King County facility, where a Feb. 9 equipment failure has limited the facility’s wastewater treatment capabilities.
All equipment that is critical to bringing West Point up to full wastewater treatment capability is operational, and now the bulk of the effort is focused on getting biological processes back on line.
No emergency bypasses of highly diluted stormwater and wastewater from the plant have occurred since Feb. 16, and beaches that were temporarily closed immediately following emergency bypasses have been open since Feb. 21.
Wastewater treatment quality and capacity are improving at West Point. Treatment includes screening, primary treatment (grit, solids and scum removal) and disinfection. Added treatment capacity has cut in half the volume of solids discharged through the plant’s deepwater outfall into Puget Sound.
As part of West Point’s restoration, King County will temporarily increase truck traffic from the plant to haul primary sludge and biosolids. Up to 13 solids trucks spread out over a 24-hour period could be expected during the next seven to 10 days.
Progress report for Thursday, April 13:
King County employees and contractors are working on a variety of projects at West Point this week:
• Crews are performing tank cleaning over the next seven to 10 days that could result is some nuisance odors that might be detectable in areas near the West Point Treatment Plant. The facility has a 24-hour odor control hotline - 206-263-3801.
• Work to restore healthy biology to the secondary treatment systems continues to be the bulk of the remaining work. Crews have brought four anaerobic digesters online and up to their operating temperature, with a fifth digester expected to come online within the next few days.
• Workers have been carefully feeding sludge from the primary treatment process to the microorganisms that are at the core of the anaerobic digestion process by breaking down the organic solids that remain following the primary treatment process.
• Equipment repair and replacement projects continue, including electrical panel installations, which are being done as soon as new panels arrive at the plant.
• Insulation work on warm-water pipes is concluding, with just a small amount of work remaining to cover various pipe joints and other small areas.
Significant rainfall isn’t anticipated for the next several days. During heavy rainstorms when the volume of stormwater and wastewater flowing into the plant appears to approach the upper limit of its current treatment capacity, plant operators can avoid an emergency bypass by diverting some of the flow headed toward West Point to other wastewater treatment facilities.
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