Drying of stingless bees pot-pollen using swirling fluidized bed dryer

Luqman Abdul, Halim and Firdaus, Basrawi and Ahmmad Shukrie, Md Yudin and Amir, Abdul Razak and Nor Azfa, Johari and Azira, Muhamad and Mohd Razif, Mamat (2020) Drying of stingless bees pot-pollen using swirling fluidized bed dryer. Drying Technology. pp. 1-9. ISSN 0737-3937. (Published)

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High moisture content in stingless bees pot-pollen makes preservation difficult. Since potpollen is heat sensitive, using conventional drying techniques below 40-C is time consuming. A fluidized bed dryer (FBD) with swirling distributor is proposed for rapid drying of the pot-pollen while conserving the nutrients. The objectives of this study are to investigate the possibility of using swirling FBD to dry pot-pollen, and to investigate the effect of distributor type and superficial air velocity on pot-pollen drying. Stingless bees pot-pollen from the state of Pahang, Malaysia was dried at different conditions. Three distributor types: perforated, 45- inclination angle, and 67- inclination angle were tested at three superficial air velocities of 1.0 m/s, 1.5 m/s, and 2.0 m/s. Then, moisture content before and after drying were studied. To ensure swirling FBD would preserve the nutrition content of pot-pollen, nuclear magnetic resonance (NMR) analysis on the pot-pollen before and after drying was also carried out. It was found that at higher velocity, the drying rate increased. The 67- swirling distributor has the best drying performance, followed by the 45- swirling and perforated distributor. The highest reduction in moisture content, 13.5% in this study was found when using 67- distributor at 2.0 m/s. This translates to a drying rate of 0.450%/min, about 6.2 times faster than conventional FBD, 5.6 times faster drying rate compared to hot air dryer (HAD) at 45 -C, 44.5 times higher than oven drying at 30 -C, and also a staggering 225 times quicker than cyclic convective dryer (CCD). It is also comparable to lower power levels of microwave assisted vacuum dryer (MW-VD), without damaging pot-pollen nutrients. The NMR analysis showed no adverse effect due to drying. Hence, it is possible to dry pot-pollen rapidly using swirling FBD without damaging its nutrition content, and using the 67- swirling distributor is preferred.

Item Type: Article
Uncontrolled Keywords: Stingless bees pot-pollen; swirling fluidized bed dryer
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Institute of Postgraduate Studies
Faculty of Mechanical and Automotive Engineering Technology
Depositing User: Ms. Ratna Wilis Haryati Mustapa
Date Deposited: 19 Jan 2021 03:58
Last Modified: 19 Jan 2021 04:00
URI: http://umpir.ump.edu.my/id/eprint/30532
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