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Case Study Due to the growing population in the region, resources were being consumed at an ever-increasing rate. The technology can be retrofitted into existing aeration basins, as seen here. operating expense over the life of the system. Following their evaluation of various technologies, the STM-Aerotor was selected based on its simplicity, treatment capabilities, and cost-effectiveness. Moreover, the existing site was fairly tight, and the compactness of the process allowed for the construction of the system into a tight footprint, which allowed the reuse of other unit processes of the existing facility. The STM-Aerotors were put into service in May of 2011. Through the care and effort of the operations staff, the Patchogue wastewater treatment plant achieves biochemical oxygen demand (BOD) and total suspended solids (TSS) levels of less than 10 mg/L and effluent total nitrogen around 3 mg/L. was evaluating technologies to prepare for the upcoming total nitrogen limit of 5 mg/L that it would be required to meet. Greenport is a tourist town with high seasonal fluctuations in population. For many years, Greenport utilized aerated lagoons followed by secondary clarification. Knowing that new technology would be needed to meet the new limits, and with money being an issue, the Village of Greenport was able to secure NYSERDA funding for the pilot testing of the STM-Aerotor. Following a successful pilot, a full-scale plant was installed in 2010. Today, the plant is achieving high-quality effluent with total nitrogen averaging around 3 mg/L. Moreover, the new system is using 30 percent less energy than a comparable conventional activated sludge or sequencing batch reactor (SBR) system. While the above plants were in the midst of the testing and design work for their facilities, the Village of Patchogue was in a similar predicament regarding upcoming effluent limits and the need to WWW.TONKAWATER.COM find a cost-effective solution. The mayor of the Village of Patchogue was a big driver in pushing for improvements to the effluent quality of the sewage treatment plant in an effort to protect the Patchogue River and Great South Bay. Knowing that the Village of Patchogue's rotating biological contactor (RBC) treatment system would not achieve the required effluent, the village worked to find a suitable treatment process that would be simple to operate, would achieve the required level of quality, and would not have a high wateronline.com ■ Jon Richens is a senior process engineer at WesTech Engineering, where he has worked for the past 16 years. He has a Bachelor of Engineering degree from the University of Utah and is a registered professional engineer. Richens specializes in the design, application, and optimization of biological treatment systems. PUR-IX™ | 763.559.2837 Water Online The Magazine Tonka Water's Pur-IX™ system provides a revolutionary ion exchange solution for potable water systems. Pur-IX™ incorporates parallel piped ion exchange vessels, which are continuously cycled through water treatment and regeneration modes with a unique multi-port valve. The system is used for treating nitrates, organics, hardness removal, color, uranium and other compounds. Benefits of Pur-IX™ include: • Ground and surface water applications • Lowest industry brine usage • Reduced waste and rinse volumes • Proven design • Continuous regeneration • Compact footprint/no valve nests • Flows up to 10 MGD through a single valve • Tonka Water's Guarantee 39