Moisture sorption isotherms and drying characteristics of aspen (Populus tremuloides).

Abstract The objectives of this study were to investigate the effects of temperature and relative humidity on the sorption characteristics and the drying rate of woody biomass, and to develop a sorption isotherm model. Experiments using Trembling Aspen ( Populus tremuloides ) as materials were conducted in a controlled environment chamber. Results showed that low temperature and high relative humidity of ambient air led to higher equilibrium moisture content (EMC) for both desorption and adsorption processes. At higher temperature, the EMC was reached over a shorter drying time indicating a higher sorption rate; relative humidity was also positively correlated with the adsorption rate. The Modified Oswin model that relates equilibrium relative humidity to temperature and EMC was found to provide the best fit to the experimental data. The trend of drying rate constant versus temperature followed the Arrhenius equation, and Page's model was appropriate for predicting the drying characteristics of Aspen.

[1]  R. Borja,et al.  Influence of immobilization supports on the kinetics of anaerobic purification of cheese factory wastewaters , 1993 .

[2]  M. A. Basunia,et al.  Moisture desorption isotherms of medium-grain rough rice. , 2001, Journal of stored products research.

[3]  M. A. Basunia,et al.  Adsorption isotherms of barley at low and high temperatures , 2005 .

[4]  H. Heräjärvi.  Effect of drying technology on aspen wood properties. , 2009 .

[5]  W. Simpson.  Determination and use of moisture diffusion coefficient to characterize drying of northern red oak (Quercus rubra) , 1993, Wood Science and Technology.

[6]  Ilias P. Tatsiopoulos,et al.  Logistics issues of biomass: The storage problem and the multi-biomass supply chain , 2009 .

[7]  S. Lahsasni,et al.  Moisture sorption isotherms and heat of sorption of bitter orange leaves (Citrus aurantium) , 2005 .

[8]  S. Lahsasni,et al.  Moisture adsorption–desorption isotherms of prickly pear cladode (Opuntia ficus indica) at different temperatures , 2003 .

[9]  Amit Kumar,et al.  Development and implementation of integrated biomass supply analysis and logistics model (IBSAL) , 2006 .

[10]  Da-Wen Sun,et al.  Comparison and selection of EMC/ERH isotherm equations for rice , 1999 .

[11]  J. Chirife,et al.  Prediction of the effect of temperature on water sorption isotherms of food material , 1976 .

[12]  S. Henderson.  A basic concept of equilibrium moisture , 1952 .

[13]  N. Arslan,et al.  The fitting of various models to water sorption isotherms of tea stored in a chamber under controlled temperature and humidity , 2006 .

[14]  Alain Cloutier,et al.  Wood drying modelling based on the water potential concept: hysteresis effects , 1994 .

[15]  Juming Tang,et al.  A general model for sorption hysteresis in food materials , 1997 .

[16]  F. Laytner.  Fundamentals and technology of wafer drying , 1989 .

[17]  C. R. Oswin.  The kinetics of package life. III. The isotherm , 1946 .

[18]  F. W. Bakker-Arkema,et al.  Drying cereal grains , 1974 .

[19]  K. Hofstetter,et al.  A comprehensive model for transient moisture transport in wood below the fiber saturation point: Physical background, implementation and experimental validation , 2011 .

[20]  Z. Kavoosi,et al.  Determination of EMC isotherms and appropriate mathematical models for canola , 2011 .

[21]  G. Bramhall.  Diffusion and the drying of wood , 1995, Wood Science and Technology.

[22]  T. Nordfjell,et al.  Fuel quality changes during seasonal storage of compacted logging residues and young trees , 2007 .

[23]  S. Mani,et al.  Drying characteristics of pine forest residues , 2009, BioResources.

[24]  S. Bruin,et al.  Water activity and its estimation in food systems: theoretical aspects , 1978 .

[25]  S. D. Peteves,et al.  Co-firing of biomass with coal: constraints and role of biomass pretreatment , 2006 .

[26]  S. Lahsasni,et al.  Equilibrium moisture content and heat of sorption of Gelidium sesquipedale , 2004 .

[27]  L. Cai.  Determination of diffusion coefficients for sub-alpine fir , 2005, Wood Science and Technology.