The West Point Treatment Plant is a large wastewater treatment plant in Seattle. It is located in the Magnolia neighborhood, within Discovery Park. It is at the tip of West Point, near the West Point Lighthouse. The plant opened in 1966. It treats wastewater from the city of Seattle and other nearby communities. In 2017, the plant suffered a catastrophic flood that disabled it for months.
Before the plant was built, raw sewage flowed directly into the Puget Sound. The visibly polluted water often led to beach closures. [1] Communities surrounding Seattle dumped wastewater into Lake Washington, contaminating it as well. In 1958, voters created the Municipality of Metropolitan Seattle (Metro) to address this problem. Two treatment plants were planned, the West Point Treatment Plant in Seattle and the South Treatment Plant in Renton. West Point opened in 1966, providing primary treatment. In 1994, Metro was merged into the King County municipal government. [2] [3] Secondary treatment was added to the plant in 1996 to meet federal Clean Water Act requirements. [4] [5]
West Point is one of three major wastewater treatment plants in the area, alongside the South and Brightwater plants. The plant serves Seattle, Shoreline, and other surrounding areas of King County and Snohomish County. Some sewers draining to West Point are combined sewer systems, which carry both wastewater and stormwater. Upgrades are underway to strengthen this system against greater storms due to climate change. [6] The system currently treats approximately 90 million U.S. gallons (340 million liters) per day during dry conditions and over 300 million U.S. gallons (1,100 million liters) per day during wet conditions. Primary treatment is possible for flows up to 440 million U.S. gallons (1,700 million liters) per day. [7]
The plant begins with basic filtration and primary treatment. Secondary treatment consists of aeration tanks and clarifier tanks. Water is disinfected with hypochlorite before it is released into the Puget Sound. [8] [9]
Solids are thickened and anaerobically digested. Gas from the process is burned for electricity to power the plant, and is sold as natural gas. The remaining solids are sold as nutrient-rich Loop biosolids, which are used for agriculture and habitat restoration. [10] [8] [9]
On February 9, 2017, the plant suffered from a massive flood. At about 2:12 AM, computer issues due to the flooding led to a massive discharge of wastewater directly into the Puget Sound. Over 180 million U.S. gallons (680 million liters) were released, including 30 million U.S. gallons (110 million liters) of sewage. [11] While water quality was not severely affected, the flood devastated the plant. [12] Many of the underground parts of the plant were flooded, requiring decontamination and costly repairs. [13] [14] Furthermore, the flood destroyed the microbial communities in the anaerobic digesters. This compromised treatment capabilities even after the flood. [15]
The Lake Washington Ship Canal, which runs through the city of Seattle, connects the fresh water body of Lake Washington with the salt water inland sea of Puget Sound. The Hiram M. Chittenden Locks accommodate the approximately 20-foot (6.1 m) difference in water level between Lake Washington and the sound. The canal runs east–west and connects Union Bay, the Montlake Cut, Portage Bay, Lake Union, the Fremont Cut, Salmon Bay, and Shilshole Bay, which is part of the sound.
Wastewater treatment is a process which removes and eliminates contaminants from wastewater and converts this into an effluent that can be returned to the water cycle. Once returned to the water cycle, the effluent creates an acceptable impact on the environment or is reused for various purposes. The treatment process takes place in a wastewater treatment plant. There are several kinds of wastewater which are treated at the appropriate type of wastewater treatment plant. For domestic wastewater, the treatment plant is called a Sewage Treatment. For industrial wastewater, treatment either takes place in a separate Industrial wastewater treatment, or in a sewage treatment plant. Further types of wastewater treatment plants include Agricultural wastewater treatment and leachate treatment plants.
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West Point is the westernmost point in Seattle, Washington, United States, jutting into Puget Sound from the Magnolia neighborhood. It also marks the northern extent of Elliott Bay; a line drawn southeastward to Alki Point marks the western extent of the bay. At the point itself is the 1881 West Point Lighthouse, the first manned light station on Puget Sound. Just to the east is the West Point Treatment Plant, and beyond that, Discovery Park, formerly the U.S. Army's Fort Lawton.
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