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DOI: https://doi.org/10.4491/eer.2017.096
New composites based on low-density polyethylene and rice husk: Elemental and thermal characteristics
Muhammad Anshar1, Dahlang Tahir2, Makhrani 2, Farid Nasir Ani3, and Ab Saman Kader4
1Department of Mechanical Engineering, State Polytechnic of Ujung Pandang, Makassar 90245, Indonesia
2Department of Physics, Hasanuddin University, Makassar 90245, Indonesia
3Department of Thermodynamics and Fluid Mechanics, Universiti Teknologi Malaysia, Skudai-Johor 81310, Malaysia
4Marine Technology Centre, Universiti Teknolgi Malaysia, Skudai-Johor 81310, Malaysia
Corresponding Author: Dahlang Tahir ,Tel: +62-411-587634 , Fax: +62-411-587634 , Email: dtahir@fmipa.unhas.ac.id
Received: July 26, 2017;  Accepted: February 6, 2018.
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We developed new composites by combining the solid waste from Low-Density Polyethylene in the form of plastic bag (PB) and biomass from rice husk (RH),in the form of (RH)x(PB)1-x (x = (1, 0.9, 0.7, 0.5)),as alternative fuels for electrical energy sources, and for providing the best solution to reduce environmental pollution. Elemental compositions were obtained by using proximate analysis, ultimate analysis, and X-ray fluorescence spectroscopy, and the thermal characteristics were obtained from thermogravimetric analysis. The compositions of carbon and hydrogen from the ultimate analysis show significant increases of 20-30% with increasing PB in the composite. The activation energy for RH is 101.22 kJ/mol; for x = 0.9 and 0.7, this increases by 4 and 6 magnitude, respectively, and for x = 0.5, shows remarkable increase to 165.30 kJ/mol. The range of temperature of about 480-660°C is required for combustion of the composites (RH)x(PB)1-x (x = (1, 0.9, 0.7, 0.5)) to perform the complete combustion process and produce high energy. In addition, the calorific value was determined by using bomb calorimetry, and shows value for RH of 13.44 MJ/kg, which increases about 30-40% with increasing PB content, indicating that PB has a strong effect of increasing the energy realized to generate electricity.
Keywords: Elemental composition | Low-density polyethylene | Plastic bags | Rice husk | Thermal characteristics
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