Diffuser Case Study - Cedar Rapids

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2. To test the efficiency of the city’s new system, Hatch took aeri- al shots of the diffuser zone with an infrared lens to determine the rate of dissipation. Before installation of the system, the heat at the single discharge point did not dissipate for over one mile. After installation, this same heat generally dissipated within 100 yards of each operating discharge port. With this much more efficient and environmentally friendly means of discharging its wastewater effluent, the City of Cedar Rapids was able to obtain a better permit. "The new permit reg- ulations are much easier to meet," Hatch said, "and they allow the city a lot of future growth." Tideflex Technologies, Inc. • 300 Bilmar Dr., Pittsburgh, PA 15205 USA • 412-919-0919 • Fax 412-919-0918 • www.tideflex.com MEASURIT www.measurit.com

1. Tideflex ® Effluent Diffusers improve water quality, allow for city growth Tideflex Technologies, Inc. • 300 Bilmar Dr., Pittsburgh, PA 15205 USA • 412-919-0919 • Fax 412-919-0918 • www.tideflex.com Foreseeing industry growth and overall city expansion, the City of Cedar Rapids, Iowa, Wastewater Treatment Plant sought a new permit that would increase the total allotted daily discharge and allow for the release of higher amounts of regulated com- pounds. However, the city was already having difficulty meeting some of the required river flow concentration levels set forth by the Iowa Department of Natural Resources. In order to obtain a better permit, the plant first needed to effect a significant reduction to the pollutant concentrations being produced by its current level of discharge. "In the winter, during low river flow, it was hard to meet the required concentrations of certain pollu- tants, such as ammonia and biological and chemical oxygen demand," said Operations Specialist Chris Hatch. "We were meeting our water quality regulations but foresaw the increase in city industry would make that an even harder goal to reach in the next 10 years." The city consulted engineering firm Howard R. Green for a means of lowering dilution-zone pollutant concentrations with- out further restricting the current discharge operation. The firm concluded that the city’s existing outfall line could be redesigned into a multi-port diffuser that would significantly enlarge the dilution zone and mix the effluent more rapidly with the receiv- ing water body. An effluent diffuser would be a more reliable and cost-effective option than altering the treatment process or installing a second outfall line. The Cedar Rapids diffuser system is comprised of a total of 73 ports spaced evenly across the length of the outfall pipe. Attached to each port is a Tideflex ® Effluent Diffuser Valve with a rubber riser and a 45-degree rubber elbow, all provided by Tideflex ® Technologies, Inc. The unique duckbill design of the Tideflex ® creates a pressure drop across the valve that maximizes the velocity of the discharging effluent and increases the speed of mixing, reducing pollutant concentrations at each discharge point. Tideflex ® Technologies’ complete diffuser package offers several benefits that have maximized the efficiency of the Cedar Rapids system. Because the products are constructed entirely of durable, flexible elastomers, they will not rust, break or erode, problems that are common with metal diffuser products. The duckbill design of the Tideflex ® prevents backflow into the header pipe as backpressure from the receiving water body effects drop-tight sealing. The diffusers are constructed of durable, abrasion-resistant elastomers that will not rust or cor- rode, eliminating the inconvenience and expense of long-term maintenance requirements. Because Cedar Rapids is a city that is continually expanding, Hatch knew that a system working efficiently at the time of installation would eventually have to be upgraded. Howard R. Green and Tideflex ® Technologies worked together to engineer a diffuser system that would meet the city’s current needs and still allow for future increases in capacity without any major redesign requirements. Tideflex ® Technologies was able to vul- canize closed a portion of the Tideflex ® Effluent Diffusers, which would limit the number of ports in operation to maintain adequate velocities within the line at the plant’s current rate of flow. Once that rate of flow is sig nificantly increased, the Tideflex ® can easily be slit open to increase overall system capacity. Jet velocity increases, allowing effluent to better disperse Case Study MEASURIT www.measurit.com


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