Application of advanced oxidation processes (ozone/UV) to reduce Escherichia coli contamination in flour slurry from rice noodles production

Name: Amornrat Jewsuwan

Address: 333 Moo1, Thasud, Muang, Chiang Rai 57100

Organization : School of Agro-Industry, Mae Fah Luang University

Email : ask.library@mfu.ac.th

Name: Aluck Thipayarat

keyword: Advanced oxidation processes - E. coli - Flour slurry - Rice noodles

ThaSH: Food sciences

ThaSH: Agricultural industries

ThaSH: Oxidation

ThaSH: Flour

ThaSH: Slurry

ThaSH: Rice noodles

Abstract: This paper aimed to demonstrate another potential use of AOPs for reclaiming flour slurry from rice noodle making process by destroying spoilage microorganisms and preventing further microbial growth using Escherichia coli as a model microorganism. A prototype AOPs system, consisting of UV sterilizer (45 W), ozone generator (2 L/min) and combined ozone/UV, was fabricated and tested on water and flour slurry (53 g/L) systems using the initial E. coli concentration at approximately, 7 log CFU/ml. The E. coli cell counts showed that UV disinfection was very effective in water, enabling the reduction of cell density from 7 to 0 log CFU/ml within 15 min at all mass circulation flow rates (0.4, 0.6, and 0.8 kg/s). For flour slurry, the blockage of UV radiation by flour suspension substantially compromised the effectiveness of UV sterilization and E. coli destruction. Although, the ozone treatment by itself showed slower E. coli inactivation kinetics on both transparent and turbid flour slurry, it produced powerful disinfecting effect when it installed prior to the UV sterilizer. The synergic combination of UV and ozone treatments in inactivating E. coli was demonstrated on the flour slurry experiment and able to eliminate E. coli viability within 8-10 min. Faster mass circulation rate facilitated higher E. coli elimination due to higher UV exposure of E. coli and better mixing/dissolution of ozone gas in flour slurry.

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Modified: 2021-10-20

Issued: 2021-10-20

บทความ/Article

application/pdf

Journal of Food Science and Agricultural Technology (2015) Vol.1 (1): 16-21

eng

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