Meeting Secondary Effluent Standards at Peaking Factors of Five and Higher

Fitzpatrick, Jim; Long, Mary E.; Wagner, D. F.; Middlebrough, Chris

doi:10.2175/193864708788735475

Cited by 4 publications

(2 citation statements)

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“…The auxiliary treatment systems are collocated with the conventional activated sludge facilities pictured on Figure 7, which currently have an average dry weather flow of approximately 38 mL/d (10 mgd). Keller et al (2005) and Fitzpatrick et al (2008) further described these facilities and the first five years of their operation. Similar to the City of Salem case discussed elsewhere in this paper, the auxiliary EHRC facilities at the City of Lawrence provided excellent treatment of wet-weather flows that exceeded the capacity of its biological treatment facilities.…”

Section: Lawrence Kansasmentioning

confidence: 99%

“…The Bay View Water Reclamation Facility in Toledo, Ohio pictured on Figure 9 has a peak wetweather treatment capacity of 1510 ML/d (400 mgd) and serves a collection system with approximately 30% combined sewers and an average dry weather flow rate of approximately 170 ML/d (45 mgd Work by Fitzpatrick et al (2008) further described the new wet-weather treatment facilities and the initial year of operations. In accordance with the CSO Long-Term Control Plan of the Toledo Waterways Initiative, a two-year performance study was completed in April 2009 that focused on the performance and effectiveness of the EHRC facility (Black & Veatch, 2009).…”

Section: Toledo Ohiomentioning

confidence: 99%

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Decades of Pathogen Protection With Auxiliary High-Rate Treatment Technologies

Fitzpatrick¹,

Brož²,

Eisner³

et al. 2013

proc water environ fed

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As with any optimal treatment solution, wet-weather alternatives should be geared to solve the problem at hand in a sustainable fashion. In most watershed studies, pathogens have been identified as the main pollutant of concern for wet-weather discharges from publicly owned treatment works (POTWs). Therefore, reliable disinfection over a wide range of flow rates tends to be the main treatment objective of most POTW wet-weather flow strategies. Low effluent suspended solids (TSS) or turbidity are generally recommended to provide effective effluent disinfection. State-of-the-art advanced physical and chemical technologies, sometimes referred to as enhanced high rate treatment (EHRT), have demonstrated their ability to provide consistently high TSS removal of wet-weather flows and produce effluents that are readily amenable to disinfection technologies widely used in conventional POTW facilities. Utilities faced with high wet-weather flow peaking factors should include auxiliary treatment facilities with EHRT technologies in their list of potentially feasible alternatives.

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Section: Lawrence Kansasmentioning

confidence: 99%

Section: Toledo Ohiomentioning

confidence: 99%

Decades of Pathogen Protection With Auxiliary High-Rate Treatment Technologies

Fitzpatrick¹,

Brož²,

Eisner³

et al. 2013

proc water environ fed

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Wet-Weather Piloting Toward the Largest Compressible Media Filter on the Planet

Fitzpatrick¹,

Weaver²,

Boner³

et al. 2011

proc water environ fed

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Onsite pilot testing was recently completed to confirm performance and design criteria for the 380-ML/d (100-mgd) excess flow high-rate treatment facilities that are being designed for the City of Springfield's wastewater treatment plant. The performance of the compressible media filter pilot demonstrated consistent compliance with all regulatory requirements for CSO treatment and produced average effluent TSS concentrations below 30 mg/L while treating wetweather flows. Furthermore, dose response testing demonstrated that the effluent from the compressible media filter was consistently amenable to hypochlorite disinfection, requiring doses and contact times equivalent to those typically used for conventional secondary effluents. The new high-rate treatment facilities will consist of new structures and equipment for influent excess flow interception, screening, compressible media filtration, hypochlorite disinfection, bisulfite dechlorination and effluent pumping. Construction of these upgrades is scheduled to be completed in 2014.

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