Treatment of Process Wastewaters for Recycling Using an Advanced Oxidation Process
Diaz, Michael E.
Law, S. Edward
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UV-enhanced ozonation experiments on unscreened overflow chiller-water samples 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). At least a 60% reduction of total microorganisms including similar reductions in coliforms and E. coli as well as the maintenance of light transmission at a value no less than 80% that of fresh water were obtained. This satisfies USDA-FSIS regulations that permit 90% recirculation of 0.5 gal (1.9 L) overflow per carcass required. Also an additional reduction (>0.8 Log CFU/mL) in aerobic plate count (APC) was documented for ozone acting in concert with UV photons as compared with the sum of the effects of O₃ and UV acting separately in series. Economic analysis of operational and maintenance costs for the UV-enhanced ozonation system recommended from this work estimates annual savings of -$244,000 in a 1/4-million bird per day plant achieving water savings of 426,000 L/day (113,000 gal/day).