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Analysis of the coffee harvesting process using an electromagnetic shaker - doi: 10.4025/actasciagron.v32i3.67824 Agronomy
Santos, Fábio Lúcio; Universidade Estadual de Maringá; Queiroz, Daniel Marçal de; Universidade Federal de Viçosa; Pinto, Francisco de Assis de Carvalho; Universidade Federal de Viçosa; Santos, Nerilson Terra; Universidade Federal de Viçosa.
Harvesting is one of the most important operations in coffee production systems. This operation has a high cost and impact on the final quality of the product. To reduce production costs, producers are looking for ways to mechanize this operation. Harvesting machines generally detach fruits from the coffee plant by vibration and/or impact. The objective of this work was to study the effect of the amplitude and frequency of vibration on the efficiency of coffee fruit harvesting. Vibration tests of coffee branches were performed in a laboratory using an electromagnetic shaker. The tests were performed using amplitudes in the range of 3.75 to 7.50 mm and frequencies from 13.33 to 26.67 Hz. Coffee branches from two different varieties were used for evaluation,...
Tipo: Pesquisa experimental Palavras-chave: 5.01.03.02-4 Coffee; Harvesting; Harvesting efficiency; Ripeness stage Mecanização Agrícola Coffee; Harvesting; Harvesting efficiency; Ripeness stage.
Ano: 2010 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6782
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Separation efficiency of a vacuum gas lift for microalgae harvesting ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Muller-feuga, Arnaud; Rene, Francois; Narvaez, Cesar; Champagne, Jean-yves; Grasmick, Alain.
Low-energy and low-cost separation of microalgae from water is important to the economics of microalgae harvesting and processing. Flotation under vacuum using a vacuum gas lift for microalgae harvesting was investigated for different airflow rates, bubble sizes, salinities and harvest volumes. Harvesting efficiency (HE) and concentration factor (CF) of the vacuum gas lift increased by around 50% when the airflow rate was reduced from 20 to 10 L min(-1). Reduced bubble size multiplied HE and CF 10 times when specific microbubble diffusers were used or when the salinity of the water was increased from 0 parts per thousand to 40 parts per thousand. The reduction in harvest volume from 100 to 1 L increased the CF from 10 to 130. An optimized vacuum gas lift...
Tipo: Text Palavras-chave: Microalgae; Foam; Flotation; Vacuum gas lift; Harvesting efficiency.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00130/24107/22369.pdf
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