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Abstract
UV-enhanced ozonation experiments on unscreened overflow chiller-water from a commercial poultry-processing plant successfully compared the oxidative and bactericidal effects of four treatments (viz., O2/O3, O2 /UV, ( O2/O3/UV, and O2 as the control). Optimal treatments provided greater than 99.9% control of pathogenic microorganisms. Results far exceeded the USDA-FSIS requirements of at least a 60% reduction of aerobic plate count (APC) bacteria including similar reductions in coliforms and E. coli, as well as the maintenance of light transmission at a value no less than 60% that of fresh water, consequently permitting 90% recirculation of the required 0.5 gal (1.9 L) overflow per carcass. Also an additional synergistic reduction (≥0.8 Log CFU/mL) in APC bacteria was documented for ozone acting in concert with UV photons as compared with the sum of the effects of O3 and UV acting in series. Economic analysis of operational and maintenance costs for this UV-enhanced ozonation system estimates annual savings of ∼$244000 in a 1/4-million bird per day plant achieving water savings of 426000 L/day (113000 gal/day).