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Do You Need Tertiary Filters at Your Wastewater Plant? Which Technology Should You Pick and Why?

Do You Need Tertiary Filters at Your Wastewater Plant? Which Technology Should You Pick and Why?

Sudhan Paranjape, Erica Stone, Rod Reardon, Chris Wall, Frank Van Pelt, Jay Thurrott
Published In: 
Florida Water Resources Journal,  
October 2010

In Florida, the requirements for both high-level disinfection and advanced wastewater treatment (AWT) dictate the need for tertiary wastewater filtration. Traditionally, plants have used traveling hood automatic backwash (ABW), upflow continuously backwashed, or deep-bed granular media filters. Newer filters designs such as membrane filters, series upflow filters, high-rate disk filters, and synthetic media filters are available that offer the potential of lower costs, enhanced water quality, or smaller footprints.

If implemented in their current forms, current regulatory initiatives by water management districts, the Florida Department of Environmental Protection (FDEP), and the U.S. Environmental Protection Agency (EPA) relative to reuse, numeric nutrient limits, and stormwater treatment will encourage utilities in Florida to look closely at these newer filtration technologies to facilitate the production of high-quality reclaimed water for public access reuse, aquifer recharge, aquifer storage and recovery, or other types of high-value reuse.

The City of Daytona Beach’s Westside Regional Wastewater Treatment Plant has a permitted capacity of 15 million gallons per day (mgd) average day flow and uses traveling hood granular media filters to filter secondary effluent, followed by ultraviolet (UV) light for high-level disinfection. Reclaimed water is pumped to the reuse distribution system or to the Halifax River during periods of low demand for reclaimed water. The facility has experienced operational issues with its current filters and decided to perform an evaluation of options (including newer innovative technologies) for renovating or replacing the existing filters. This article provides the results of an economic evaluation of the capital and operations lifecycle costs for several alternatives for renovating or replacing the existing filters.

Paranjape, S., Stone, E., Reardon, R., Wall, C., VanPelt, F., Thurrott, J. Do You Need Tertiary Filters at Your Wastewater Plant? Which Technology Should You Pick and Why? Florida Water Resources Journal, Vol. 62, No. 10, pp. 8-16, 2010.