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Evaluation of the effect of a novel membrane filtration system on the lifespan of frying oil |
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| Authors: | Philippe Geiger Jürg Buchli Ramona Rüegg Nadina Müller |
| Affiliation: | 1. Zurich University of Applied Science (ZHAW), Einsiedlerstrasse 34, 8820 Wädenswil, Switzerland Contribution: Conceptualization (equal), Data curation (equal), Formal analysis (equal), Investigation (equal), Methodology (equal), Writing - original draft (equal);2. Zurich University of Applied Science (ZHAW), Einsiedlerstrasse 34, 8820 Wädenswil, Switzerland Contribution: Conceptualization (lead), Data curation (equal), Funding acquisition (lead), Project administration (equal), Supervision (equal), Writing - review & editing (supporting);3. Zurich University of Applied Science (ZHAW), Einsiedlerstrasse 34, 8820 Wädenswil, Switzerland Contribution: Data curation (equal), Formal analysis (equal), Investigation (equal), Writing - review & editing (equal);4. Zurich University of Applied Science (ZHAW), Einsiedlerstrasse 34, 8820 Wädenswil, Switzerland |
| Abstract: | Frying oil has a limited lifetime which results in the disposal of approximately 67% of all used oil. The aim of this study is to determine the suitability of different membranes for purifying frying oil and investigate the application of continuous membrane filtration in a commercial deep fryer. Eleven different membranes were tested to assess their suitability for filtrating frying oil. A prototype continuous filtration system with an integrated membrane filter was developed for a deep fryer to assess the effect of continuous membrane filtration on oil degradation. The prototype was subjected to a frying test over 13 days and the results compared to those from a standard deep fryer. The prototype maintained total polar compounds (TPC) at an acceptable level of <12% and the oil remained light in colour even after more than 280 h of use, while TPC in the standard deep fryer rose to >27%. |
| Keywords: | Deep frying membrane filtration membrane processing oil stability used frying oil |