Seed oil extraction using a solar powered screw press |
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| Institution: | 1. Department of Food Science and Technology, Sokoine University of Agriculture, P.O. Box 3006, Morogoro, Tanzania;2. Industrial Agricultural Products Center, University of Nebraska, 209 L.W. Chase Hall, Lincoln, NE 68583-0730, USA;1. Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran;2. Head of Process Engineering & Systems Improvement, Management of Fruit and Vegetables Organizations, Tehran Municipality, Tehran, Iran;3. Department of Geography, Ghent University, Ghent, Belgium;4. Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic;5. Department of Engineering Management, University of Antwerp, Antwerp, Belgium;6. Department of Agronomy and Plant Breeding, Sari Agricultural Sciences and Natural Resources University, Sari, Iran;7. Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran;1. Department of Environmental Sciences, Informatics and Statistics, Università Ca’ Foscari Venezia, Dorsoduro 2137, I-30123 Venezia, Italy;2. Department of Industrial Engineering, University of Trento, via Mesiano 77, I-38132 Povo, Trento, Italy;3. Department of Physics, University of Trento, via Sommarive 14, I-38123 Povo, Trento, Italy;1. Department of Mechanical Engineering, Kumasi Polytechnic, Kumasi, Ghana;2. Department of Mechanical Engineering, UENR, Sunyani, Ghana;3. Department of Mechanical Engineering, KNUST, Kumasi, Ghana;1. Instituto Multidisciplinario de Biología Vegetal (IMBIV, CONICET – UNC), Av. Vélez Sarsfield 1611, X5016GCA Córdoba, Argentina;2. Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN – UNC), Av. Vélez Sarsfield 1611, X5016GCA Córdoba, Argentina;3. Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Av. Vélez Sarsfield 1611, X5016GCA Córdoba, Argentina;4. Instituto de Ciencia y Tecnología de Alimentos Córdoba (ICYTAC – CONICET), Universidad Nacional de Córdoba (UNC), Juan Filloy s/n, Ciudad Universitaria, 5016 Córdoba, Argentina;1. Rajalakshmi Institute of Technology, Kuthambakkam, Chennai, India;2. Koneru Lakshimahia Education Foundation, Green Fields, Vaddesswaram, Andhrapradesh, India |
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| Abstract: | An efficient and economical oil expression system that can operate on solar power in rural areas of underdeveloped and developing countries is needed. Recent improvements in both oil extraction and solar energy technologies have indicated the possibilities for fabricating oil extraction equipment. Thus, the objective of our study was to develop a simple oil expression unit capable of producing high quality oil based on solar energy in remote rural areas. A photovoltaic (PV), batch operated, low-pressure oil press, using a 190 W, 12 V dc motor, was designed, fabricated, and tested using coconut and groundnut as the raw material. Samples used in the study were ground to particle size between 500 μm and 2 mm and were pressed at 12 ± 1% moisture content. The press was evaluated based on the oil extraction efficiency (OEE), power consumption, and oil quality. The press had an average OEE of 73% for coconuts and 70% for groundnuts after 12 min of pressing. The oil expression efficiency was characterized by three main stages namely delayed, rapid, and retarded. The power consumption was affected greatly by the pressing time, with power consumption increasing with an increase in the pressing time. The specific energy consumption was found to increase significantly after 8 min of pressing and correlated with the compaction of the cake, which resulted in more power being required to express the entrapped oil. The expressed oil was fresh, free from foots, and of high quality with an average moisture content of 0.015% for coconut oil and 0.019% for groundnut. Analyses showed that the viscosities were 42.1 MPa s (coconut oil) and 59.1 MPa s (groundnut oil), at 25 °C. Overall, the press performed well and was comparable in performance to other types of presses. |
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