Abstract
Exposure of kumquat fruit to high ambient temperatures during transport leads to excessive deterioration. The aim of this study was to develop an integrated postharvest citrus treatment unit capable of being operated on site at the orchard. The unit consists of rinsing, disinfection (anolyte water), hot water (HWT), surface drying and biocontrol (BT) zones. An energy analysis revealed an electricity consumption of 4.13 and 2.08 kW by the HWT and BT, respectively. The thermal efficiencies of the HWT and BT were 72 % and 87 %, respectively. The total carbon ratio was 0.46 kg CO2 day−1 with a payback period of 0.91 years. An exposure time of 30 s in anolyte water, hot water at 60 °C + 30 s, 60 °C + 20 s and 53 °C + 30 s and the presence of B13 resulted in low PWL values. A total of 30 s and 60 s of anolyte water; 53 °C; 60 °C + 20 s hot water resulted in firmer fruit.
Funding statement: The financial assistance of the National Research Foundation (NRF) towards this research is hereby acknowledged. The authors also thank University of KwaZulu-Natal and the Canon Collins Educational and Legal Trust for providing financial support in this study.
Disclosure statement
Opinions expressed and conclusions arrived at are those of the authors and are not necessarily to be attributed to the NRF.
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