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Small Community Leads Central Florida in Potable Water Reuse Implementation Altamonte Springs’ O 3 /BAF Treatment Facility is the First of its Kind in the State
According to recent studies conducted by the Central Florida Water Initia- tive, groundwater sources alone will not meet future freshwater demands for area residents. To address this looming issue, Central Florida water utili- ties will need to begin diversifying their water supplies. There are several options water utilities can consider when expanding their drinking water sources, including surface water, groundwater, and desalination. One op- portunity that is gaining nationwide popularity is potable water reuse. “The city of Altamonte Springs, located in Seminole County, Florida, was one of the first in the area to attack its water challenges by investigating drinking water reuse.” The municipality implemented a pilot program, funded in large part by a grant provided by the St. Johns RiverWater Management District (SJRWMD). The pilot called the pureALTA project was designed with two primary goals – to serve as platform for Altamonte Springs’ future potable water reuse efforts, and to educate the 45,000 residents about the benefits of potable water reuse.
The pureALTA project pureALTA is an advanced treatment facility in Altamonte Springs that treats reclaimed water by employing an advanced treatment train that results in municipal drinking water. The city worked with Carollo Engineers and Xylem to develop an ozone-biologically active filtration- based (O3/BAF) advanced water treatment train that also included ultrafiltration (UF) membranes, granular activated carbon (GAC) filtration, and ultraviolet advanced oxidation (UV AOP).
This solution was chosen over reverse osmosis (RO)-based systems that typically have high capital and operating costs, and the added burden of brine disposal. The pureALTA treatment process begins with reclaimed water, which is then treated to meet or exceed drinking water quality standards without using expensive, energy- consuming RO. The innovative network of two advanced water treatment processes – Ozone and Bio- logically Active Filtration – is handled by the Xylem Oxelia integrated O3/BAF system, featuring a GSO 30 Ozone Generator, XA underdrain, and IMS 200 media retainer technologies. The Xylem Oxelia system treats approximately 28,000 gallons per day (gpd) and uses an O3:(TOC+nitrite) ratio to set the ozone dose. The citymonitors systemperformance with Xylem analytics equipment from YSI, including NiCaVIS (upstream of process) and CarboVIS (downstream of process). Pilot results The integrated Oxelia process set the tone for the performance of the entire treat- ment train. The TOC reduction across the system ranges from 25 to 37 percent. More importantly, it operates as successful barrier for the UF membranes. Through one year of operation, the UF did not require any maintenance cleans and only performed a single clean-in-place. This compared to most membrane operations that typically require cleanings every six months.
Biofiltration column from Leopold, a Xylem Brand that includes XA Underdrain and IMS 200 Media Retainer.
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