Alternative Disinfection for Aquifer Storage and Recovery of Surface Water

Pasteurization and ultraviolet disinfection with titanium dioxide (UV/TiO2) were pilot tested as disinfection processes for the Taylor Creek ASR well near Lake Okeechobee, FL. Both technologies provided greater than 4-log disinfection of coliform bacteria even under challenging water quality conditions (very low UVT and high TSS).Differences in treatment costs are regulation specific and site specific. For example, the low chlorine CT requirements in Florida make chlorine by far the cheapest technology. Whereas in California, the 450 CT for chlorine makes UV less expensive. The current costs of natural gas and electricity are showing pasteurization to be less expensive than any disinfection technology in California and equivalent to chlorine and UV in the Midwest.