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Effect of Reaction Temperature and Catalyst Concentration Wendi Wendi
Sriwijaya International Seminar on Energy-Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Sriwijaya International Seminar on Energy-Environmental Science and Technology

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Biodiesel is an alternative fuel for diesel engines consisting of the alkyl monoesters from vegetable oils or animal fats. Beef tallow is the non-edible raw material with low cost production and the availability is huge in the cattle production. The objective of the study was to utilize waste animal fat (beef) for biodiesel production using solid oxide catalyst. The solid oxide catalyst derived from the industrial waste eggshells. The waste materials calcined with temperature 900oC and time 2 hours, transformed calcium species in the shells into active CaO catalysts. The oil contained high free fatty acid (FFA) content of 1.86%. The FFA content of the oil was reduced by acid-catalyzed esterification. The product from this stage was subjected to transesterification to produce biodiesel. Transesterification process produces methyl ester and glycerol. The produced methyl ester on the upper layer was separated from the glycerol and then washed. Effect of various process variables such as amount of catalyst and temperature were investigated. The biodiesel properties like methyl ester content, density, viscosity, and flash point was evaluated and was found to compare well with Indonesian Standard (SNI). Under the best condition, the maximum yield of 82.43% beef tallow methyl ester was obtained by using 9:1 molar ratio of methanol to beef tallow oil at 55oC, for a reaction time 1.5 hours in the presence 3 wt% of CaO catalyst. The results of this work showed that the use of beef tallow is very suitable as low cost feedstock for biodiesel production.
PELATIHAN COACHING CLINIC SISTEMATIKA SENAM AEROBIC Eko Rudiansyah; Cossato G Yeriko; Wendi Wendi; Lorensius Megi
Bestari: Jurnal Pengabdian Kepada Masyarakat Vol 3, No 1 (2023)
Publisher : Sekolah Tinggi Keguruan dan Ilmu Pendidikan (STKIP) Melawi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46368/dpkm.v3i1.980


The Community Partnership Program which has been implemented in partnership with the Indonesian National Sports Committee of Melawi Regency, Sports coaching and development is part of an effort to improve the quality of Indonesian people aimed at improving the physical and spiritual health of the community. The Coaching Clinic training on the systematics of aerobic exercise which is carried out in order to overcome problems is carried out with an approach method that focuses on a participatory approach in every student of the STKIP Melawi physical education study program. At the time of implementation of activities as a whole ran smoothly. However, there were several obstacles encountered during the implementation of the activity, including: Lack of understanding of students about aerobics so that when asked about basic gymnastic movements they could not answer, student participants had difficulty distinguishing warm-up, core and cool-down movements, and students were still not ready to guide aerobics in front of other participants. The results of the implementation of the Aerobic Gymnastics Systematic Coaching Clinic made the practice results liked by all training participants even though there were still many participants who were afraid to become aerobic gymnastics instructors.