Microbiological Benefits of Removing Foam Formed After UV‐Enhanced Ozonation of Poultry‐Processing Chiller Water for Recycling

Abstract

Prior experiments using 250 mL samples of unscreened poultry overflow chiller water evaluated the beneficial bactericidal and oxidative effects of 4 different treatments (namely, O 2 /O 3 , O 2 /UV, O 2 /O 3 /UV, and O 2 as the control) for improving microbiological safety, turbidity, and water-use efficiency allowing its reconditioning for reuse. When excluding foam as in this present study, synergistic reductions . 1.5 log CFU/mL for aerobic plate counts (APC) were additionally achieved after 4 min for all O 3 /UV treatment combinations as compared to serially applied treatments of O 3 and UV acting separately. With foam present, 16-min O 3 /UV treatments were required to achieve similar results. We now report these additional benefits achieved by removing the foam formed by the advanced oxidation process of ultraviolet-photon enhanced ozonation. Furthermore, foam microbial and general physical content were analyzed to determine suitability as an additive in rendering-type processes. Treatment of the wastewater resulted in total plate counts between 2 to 4 Log CFU/mL in the foam after 8 min. Fat and protein constituted 89% of the solids collected (384 mg/L or 14% of the foam) with trace amounts of metal elements (for example, Ca, Na, K, Fe, Cu) present. Irradiating had negligible effect on foam characteristics yet decreased the amount of solids collected.

Kinetic Analysis of the Ozonation Process of the Surfactant LAS Considering the Simultaneous Foaming Effect

“…This feature is of vital importance when considering an AOP as a remediation treatment in contaminated water, especially in systems in which the oxidant is gaseous. Nevertheless, certain AOP show additional benefits over biological or physicalchemical treatments because they can achieve a high level of foam removal [23] in addition to a satisfactory degradation rate of LAS.…”

The Effect of Mixing Ratios on the Performance of an Integrated Poultry Slaughterhouse Wastewater Treatment Plant for a Recyclable High-Quality Effluent

“…UV radiation technology has been used to treat water since 1909 and offers one of the safest and most effective disinfection approach for drinking water [28]. UV disinfection has also shown to be useful for the elimination of pathogens in poultry wastewater [29].…”