Application of Ozone with Physical Wastewater Treatments to Recondition Poultry Process Waters

Abstract

Several wastewater treatments, including direct ozonation and a combination of ozonation with either slow sand filtration, dissolved air flotation, or diatomaceous earth (DE) filtration, were tested for their ability to recondition broiler process waters. The quality of broiler prechiller overflow water was significantly improved with all wastewater treatments examined, surpassing the USDA's recycling requirements in nearly all trials. A combination of screening, DE filtration, and ozonation yielded the highest quality water. With this treatment, significant reductions in chemical oxygen demand, total solids, and the total microbial load including conform bacteria and salmonellae of 87, 65, and 99.9%, respectively, were detected in the reconditioned prechiller water. Percentage of light transmission at 500 nm (%T) of treated water increased to 97 % of tap water and compared favorably with %T of potable water. This same water treatment was tested on final carcass rinse and neck chiller overflow waters. The quality of these treated waters was also significantly improved. It was concluded that poultry process waters could be effectively reconditioned for recycling by screening, DE filtration, and ozonation. Furthermore, wastewater organic loads discharged to wastewater treatment facilities can be effectively reduced through these reconditioning practices. (

Use of ozone in the food industry

“…Multifunctionality of ozone application makes ozone a promising agent. Although ozone has not been commonly used in the dairy and food industry, it has found limited applications in a few areas such as conversion of green tea to black tea (Graham, Struder, & Gurkin, 1969), cleansing of shellfish (Anonymous, 1972), and disinfection of poultry carcasses and chill water in the poultry industry (Yang & Chen, 1979;Sheldon & Brown, 1986;Chang & Sheldon, 1989). In this review, mainly its chemical properties, generation, antimicrobial properties, application on food surfaces, application on food plant equipment as an alternative sanitizer.…”

The efficacy of ozone as a pre- and post-treatment option for UASB-treated food processing wastewaters

“…The COD reductions, for ozone treatment alone (53.0-61.7%) compare favourably with previous results achieved by other authors. Benitez et al (1999) achieved 20-30% COD reduction by ozonating winery wastes, while COD reductions of 41.4%, 65% and 47 -62% were reported for ozonation of wine-distillery, yeast production and poultry processing wastewaters, respectively (Chang and Sheldon, 1989;Filipović-Kovačević and Sipos, 1995;Beltrán et al, 2001). The UASB reactor efficiency is represented in Figure 2.…”

“…Some organic compounds react more slowly with ozone, sometimes resulting in the formation of organic solutes which are more susceptible to subsequent biological oxidation (Gulyas et al, 1995;Gottschalk et al, 2000). The COD contents of various food processing wastewaters have been successfully treated using post-ozonation/oxidation treatments, including fruit cannery, distillery, poultry processing, yeast-production and table olive debittering wastewaters (Chang and Sheldon, 1989;Filipović-Kovačević and Sipos, 1995;Beltrán et al, 1997Beltrán et al, , 1999Beltrán et al, , 2001). However, very little research on the use of ozone as a pre-treatment to anaerobic digestion can be found in the literature.…”

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

“…USDA's reuse standards were only partially met; bacterial reductions were adequate but light transmission values were not. Later work by Chang and Sheldon (1989b) demonstrated that USDA's requirements could be fully achieved after screening and diatomaceous earth filtration followed by ozonation with no adverse effect on carcass quality (Chang and Sheldon 1989a). Previous work by the authors documented increased effectiveness in reducing total aerobic plate counts (APC) from chiller water with an AOP (Diaz and others 2001).…”