Diffuser Case Study - CL2 Reduction

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1. Tideflex ® diffuser system helps city maintain compliance with EPA chlorine regulations Tideflex Technologies, Inc. • 300 Bilmar Dr., Pittsburgh, PA 15205 USA • 412-919-0919 • Fax 412-919-0918 • www.tideflex.com The City of Moline, IL., faced impending permit changes rel- ative to chlorine-level regulations at its South Slope Wastewater Treatment Plant when the Illinois Environmental Protection Agency (IEPA) implemented a reduction to the total residual chlorine limits for wastewater effluent discharg- ing into the Rock River. Using two separate discharge points, the plant was releasing treated wastewater that contained chlo- rine concentration levels that did not meet current U.S. Environmental Protection Agency (USEPA) water quality reg- ulations. Moline wanted to find a way to reduce the total residual chlorine in its effluent discharge without performing major modifications to its wastewater treatment process. At the same time, the city wanted to reduce ammonia levels in the effluent to address possible future ammonia limit regulations. The city called on consulting engineer Shive-Hattery for a con- venient, efficient and cost-effective solution that could be implemented and operating sufficiently prior to the EPA’s mandated compliance date. After reviewing several options, including the use of alternate disinfectants and chemical de- chlorination, Shive-Hattery proposed installation of a large dif- fuser system that would reduce chlorine concentration levels by rapidly mixing the effluent with river water and by increas- ing the number of effluent discharge points, thus dispersing the treated wastewater over a much wider area. Enlarging the discharge area made sense to the staff at the South Slope Plant. "We wanted to be able to discharge and still use the amount of chlorine that we needed to treat the wastewater," said Plant Manager Robert Barnard. "What we needed was a greater zone of initial dilution."The diffuser sys- tem was comprised of ten 10-inch Tideflex ® 35-D Diffusers set at 10-foot intervals across a 100-foot pipeline. The "duck- bill" design of the Tideflex ® Effluent Diffusers would maxi- mize the velocity of the discharging effluent and increase the speed of mixing, reducing chlorine concentration at each dis- charge point. The simple construction and installation of the diffuser sys- tem saved the city hundreds of thousands of dollars in com- parison with other chlorine-reduction options. Furthermore, because Tideflex ® Effluent Diffusers are of a reliable con- struction that provides optimum abrasion resistance, absolute backflow prevention and a useful service life of up to 50 years, the city would avoid inconvenient and expensive long-term maintenance requirements. Two months prior to the chlo- rine-reduction compliance date, the diffuser system was approved by the IEPA and installed. Following installation, a test was conducted to calculate the diffuser’s true ability to lower total residual chlorine content at each discharge zone. "The diffuser spread the effluent over such a great area that the chlorine couldn’t even be detected at the discharge points," Barnard said. The system has now kept the city in compliance with IEPA chlorine limi- tations for more than three years. Approximately one year after the installation of the Rock River Diffuser System, the Illinois Council of Consulting Engineers presented Shive-Hattery with the annual Illinois Engineering Excellence Award for the design and implementation of the City of Moline’s improved chlorine con- centration reduction system. The dry Bayou Marcus wetlands before facility startup Tideflex ® Effluent Diffuser being installed in Rock River Case Study MEASURIT www.measurit.com

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