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Session 28B: Facility Operations and Maintenance: Wet Weather Treatment
10:30am - 12:00pm
Session Chair: Gregg Thompson, Jacobs;
10:30am - 11:15am
Enhanced and Simple Wet Weather Treatment with Pile Cloth Media Filtration
Aqua-Aerobic Systems, Inc., United States of America;
After extensive use of cloth media filtration in tertiary applications for over two decades, pile cloth media filtration has now been adapted for wet weather treatment. This wet weather/stormwater filtration technology offers a small footprint and is capable of treating extremely high solids while providing high quality effluent.
Many studies have been conducted on raw domestic wastewater and wet weather conditions. The initial pilot study was conducted at the Rock River Water Reclamation District (RRWRD) in Rockford, IL in 2014, then Rushville, IN in 2015 and since then at other locations throughout the country. These studies have documented the technology’s capabilities to achieve TSS removal of >80%. This high removal efficiency can be achieved without the use of chemicals. Additional study work has been done to determine if the addition of a coagulant will increase removal of TSS and BOD for wet weather applications.
This paper will cover work conducted so far in many pilot studies and ongoing full-scale operating data from installations during wet weather conditions. The focus will be to do a comparison of influent and effluent performance achieved during pilot studies, full-scale operation including a comparison of pilot data versus full scale operation.
Pile cloth media filtration has emerged as a new solution and a promising technology for the treatment of wet weather flows due to its proven performance and very simple operating requirements. For Rushville, IN and other installations, the cloth media filtration technology will allow the utility to treat the excess wet weather flow to a high quality, blend with the treatment plant secondary effluent, and use UV for disinfection. The blended flow of wet weather and secondary effluent will allow the treatment plant to meet its future NPDES permit limits.
11:15am - 12:00pm
Successful Design and Integration of the Murray Wet Weather Facility into the Community
HDR, United States of America;
King County Wastewater Treatment Division has been actively reducing the discharge of untreated combined sewer overflows (CSOs) into Puget Sound. One piece of King County’s CSO program is the new Murray Wet Weather Facility which minimizes CSOs from the Murray basin in West Seattle, Washington. During heavy rain, the existing Murray Avenue Pump Station capacity was previously exceeded, resulting in untreated CSOs into Puget Sound. The new 1-million-gallon storage tank reduces yearly CSO events from five to one, meeting Department of Ecology and Environmental Protection Agency (EPA) Consent Decree requirements and improving Puget Sound water quality.
Using a unique, circular-shape, gravity-fed storage tank, automated cleaning system and odor control system; the facility efficiently meets project requirements while blending into the neighborhood. The circular shape allowed the new facility to be constructed on a limited site without the need to acquire adjacent property rights for excavation support, while utilizing an efficient structural design in challenging geologic conditions.
Extensive community involvement—including public meetings, a charrette process and advisory groups—reduced visual impacts even with the aggressive design schedule driven by EPA Consent Decree requirements. The facility encourages public access, improves connectivity and enhances environmental stewardship with a green roof, bioretention swales and permeable pavement to treat stormwater runoff. Artwork creates a “Mountains to Sound” theme, a metaphor for water’s journey from the Cascade Mountains to the Puget Sound shoreline, a journey reflected in the facility’s use. This award-winning project opened to an enamored crowd and the facility is a model for enhancing the environment and infrastructure while creating a destination for residents and the local community.