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Environments 2017, 4(2), 36;

The By-products and Emissions from Manufacturing Torrefied Solid Fuel Using Waste Bamboo Chopsticks

Graduate Institute of Environment Engineering, National Taiwan University, Taipei 106, Taiwan
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
Department of Occupational Safety and Health, China Medical University, Taichung 404, Taiwan
Department of International Business, Chung Yuan Christian University, Chung-Li 320, Taiwan
Department of Environmental Engineering, National I-Lan University, I-Lan 260, Taiwan
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
Department of Environmental Engineering, Da-Yeh University, Changhua 515, Taiwan
Department of Forestry and Resource Conservation, National Taiwan University, Taipei 106, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 28 February 2017 / Revised: 20 April 2017 / Accepted: 23 April 2017 / Published: 11 May 2017
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Although the main purpose of the torrefaction of biomass is to produce high quality solid bio-fuel, the by-products, including liquid and gas products, are worth investigating to know their effects on the environment and the reusable possibility. Consequently, after torrefying waste bamboo chopsticks (WBCs) for producing solid bio-fuel, the liquid and gas products were examined in this study. The torrefaction target was set to produce torrefied waste bamboo chopsticks (WBCT) retaining about 70 wt %. A proper torrefaction temperature (Tr) and torrefaction time (tr) were found at 563 K and 40 min, respectively, for carrying out the torrefaction in a tubular furnace with carrier nitrogen. These conditions gave a solid yield (YS) of 69 wt % of WBCT relative to the original WBC, and 31 wt % of by-products were produced. The liquid products were composed of water as high as 62 wt %, along with some organic acids. Some medicine components were also found in the liquid products, representing potential medicine applications. During torrefaction, CO, NOx, SO2, and CO2 emissions were largely discharged from 10 to 20 min of torrefaction time. O2, CO2, and H2O are the major compounds in the total gas products collected. Some combustible gases of C1 to C6 hydrocarbons were also produced. Moreover, the gas volume balances were computed and evaluated. The information obtained in this study is useful for the proper design, operation, pollution control, and utilization of the products. View Full-Text
Keywords: torrefaction; waste bamboo chopsticks; Moso bamboo; solid bio-fuel torrefaction; waste bamboo chopsticks; Moso bamboo; solid bio-fuel

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Chen, Y.-H.; Chang, C.-C.; Chang, C.-Y.; Yuan, M.-H.; Ji, D.-R.; Ho, C.; Chiou, C.-S.; Shie, J.-L.; Chen, Y.-H.; Chang, W.-R.; Yang, T.-Y.; Hsu, T.-C.; Huang, M.; Wu, C.-H.; Lin, F.-C. The By-products and Emissions from Manufacturing Torrefied Solid Fuel Using Waste Bamboo Chopsticks. Environments 2017, 4, 36.

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