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 JSBS  Vol.5 No.1 , March 2015
Sustainable Technologies for Small-Scale Biochar Production—A Review
Abstract: Charcoal has found enormous application in both agriculture (AKA biochar) and other sectors. Despite its potential benefits, small scale technologies relevant for its production remain a challenge. Technologies striking a balance between user friendliness, energy efficiency, ease of adaptation and limited emissions could easily be integrated into the local community for the sustainable production of biochar answering both technical and socio-economic aspects. These technologies can be customized to recover the produced heat alongside biochar and the producer gas. The purpose of this work is to review the state of the art in small scale technologies, their associated risks and challenges as well as research gaps for future work. Factors affecting biochar production have been discussed and temperature is known to heavily influence the biomass to biochar conversion process. Based on the reviewed work, there is a need to develop and promote sustainable and efficient technologies that can be integrated into biochar production systems. There is also further need to develop portable, economically viable technologies that could be integrated into the biochar production process without compromising the quality of produced biochar. Such technologies at midscale level can be channeled into conventional small scale farmer use in order that the farmers can process their own biochar.
Cite this paper: Nsamba, H. , Hale, S. , Cornelissen, G. , Bachmann, R. (2015) Sustainable Technologies for Small-Scale Biochar Production—A Review. Journal of Sustainable Bioenergy Systems, 5, 10-31. doi: 10.4236/jsbs.2015.51002.
References

[1]   Lehmann, J., Gaunt, J. and Rondon, M. (2006) Bio-Char Sequestration in Terrestrial Ecosystems—A Review. Mitigation and Adaptation Strategies for Global Change, 11, 395-419.
http://dx.doi.org/10.1007/s11027-005-9006-5

[2]   Verheijen, F., Jeffery, S., Bastos, A.C., Velde, M.V.D. and Diafas, I. (2009) Biochar Application to Soils—A Critical Scientific Review of Effects on Soil Properties, Processes and Functions. EUR 24099 EN Office for the Official Publications of the European Communities, Luxemburg, 149.

[3]   Feng, Y., Xu, Y., Yu, Y., Xie, Z. and Lin, X. (2012) Mechanisms of Biochar Decreasing Methane Emission from Chinese Paddy Soils. Soil Biology and Biochemistry, 46, 80-88.
http://dx.doi.org/10.1016/j.soilbio.2011.11.016

[4]   Rajkovich, S., Enders, A., Hanley, K., Hyland, C., Zimmerman, A.R. and Lehmann, J. (2011) Corn Growth and Nitrogen Nutrition after Additions of Biochars with Varying Properties to a Temperate Soil. Biology and Fertility of Soils, 48, 271-284.
http://dx.doi.org/10.1007/s00374-011-0624-7

[5]   Amonette, J. and Joseph, S. (2009) Characteristics of Biochar: Micro-Chemical Properties. In: Lehmann, J. and Joseph, S., Eds., Biochar for Environmental Management: Science and Technology, Earthscan, London, 33-52.

[6]   Whitman, T. and Lehmann, J. (2009) Biochar—One Way Forward for Soil Carbon in Offset Mechanisms in Africa? Environmental Science & Policy, 12, 1024-1027.
http://dx.doi.org/10.1016/j.envsci.2009.07.013

[7]   Sohi, S., Krull, E., Lopez-Capel, E. and Bol, R. (2010) A Review of Biochar and Its Use and Function in Soil. Advances in Agronomy, 105, 47-82.
http://dx.doi.org/10.1016/S0065-2113(10)05002-9

[8]   Bird, M.I., Wurster, C.M., De Paula Silva, P.H., Bass, A.M. and De Nys, R. (2011) Algal Biochar—Production and Properties. Bioresource Technology, 102, 1886-1891.
http://dx.doi.org/10.1016/j.biortech.2010.07.106

[9]   Laird, D.A., Brown, R.C., Amonette, J.E. and Lehmann, J. (2009) Review of the Pyrolysis Platform for Coproducing Bio-Oil and Biochar. Biofuels, Bioproducts and Biorefining, 3, 547-562.
http://dx.doi.org/10.1002/bbb.169

[10]   Kameyama, K., Miyamoto, T. and Shinogi, Y. (2010) Increases in Available Water Content of Soils by Applying Bagasse-Charcoals. 19th World Congress of Soil Science, Soil Solutions for a Changing World, 105-108.
http://www.ldd.go.th/swcst/Report/soil/.%5Csymposium/pdf/1663.pdf

[11]   Apaydin-Varol, E. and Pütün, A.E. (2012) Preparation and Characterization of Pyrolytic Chars from Different Biomass Samples. Journal of Analytical and Applied Pyrolysis, 98, 29-36.
http://dx.doi.org/10.1016/j.jaap.2012.07.001

[12]   Cowie, A.L., Penman, T.D., Gorissen, L., Winslow, M.D., Lehmann, J., Tyrrell, T.D., Kellner, K., et al. (2011) Towards Sustainable Land Management in the Drylands: Scientific Connections in Monitoring and Assessing Dryland Degradation, Climate Change and Biodiversity. Land Degradation & Development, 22, 248-260.

[13]   Pratt, K. and Moran, D. (2010) Evaluating the Cost-Effectiveness of Global Biochar Mitigation Potential. Biomass and Bioenergy, 34, 1149-1158.
http://dx.doi.org/10.1016/j.biombioe.2010.03.004

[14]   Williams, M.M. and Arnott, J.C. (2010) A Comparison of Variable Economic Costs Associated with Two Proposed Biochar Application Methods. Williams and Arnott, Annals of Environmental Science, 4, 23-30.
http://iris.lib.neu.edu/cgi/viewcontent.cgi?article=1056&context=aes

[15]   Lehmann, J. (2007) Bio-Energy in the Black. Frontiers in Ecology and the Environment, 5, 381-387.
http://dx.doi.org/10.1890/1540-9295(2007)5[381:BITB]2.0.CO;2

[16]   Duku, M.H., Gu, S. and Hagan, E.B. (2011) Biochar Production Potential in Ghana—A Review. Renewable and Sustainable Energy Reviews, 15, 3539-3551.
http://dx.doi.org/10.1016/j.rser.2011.05.010

[17]   Yao, Y., Gao, B., Inyang, M., Zimmerman, A.R., Cao, X., Pullammanappallil, P. and Yang, L. (2011) Biochar Derived from Anaerobically Digested Sugar Beet Tailings: Characterization and Phosphate Removal Potential. Bioresource Technology, 102, 6273-6278.
http://dx.doi.org/10.1016/j.biortech.2011.03.006

[18]   Peterson, S.C. and Jackson, M. (2014) Simplifying Pyrolysis: Using Gasification to Produce Corn Stover and Wheat Straw Biochar for Sorptive and Horticultural Media. Industrial Crops and Products, 53, 228-235.
http://dx.doi.org/10.1016/j.indcrop.2013.12.028

[19]   Ghani, W.A.W.A.K., Mohd, A., Da Silva, G., Bachmann, R.T., Taufiq-Yap, Y.H., Rashid, U. and Al-Muhtaseb, A.H. (2013) Biochar Production from Waste Rubber-Wood-Sawdust and Its Potential Use in C Sequestration: Chemical and Physical Characterization. Industrial Crops and Products, 44, 18-24.
http://dx.doi.org/10.1016/j.indcrop.2012.10.017

[20]   Wiedner, K., Rumpel, C., Steiner, C., Pozzi, A., Maas, R. and Glaser, B. (2013) Chemical Evaluation of Chars Produced by Thermochemical Conversion (Gasification, Pyrolysis and Hydrothermal Carbonization) of Agro-Industrial Biomass on a Commercial Scale. Biomass and Bioenergy, 59, 264-278.
http://dx.doi.org/10.1016/j.biombioe.2013.08.026

[21]   Reed, T.B. and Das, A. (1988) Handbook of Biomass Downdraft Gasifier Engine System. SERI, Golden, CO.
http://taylor.ifas.ufl.edu/documents/handbook_of_biomass_downdraft_gasifier_engine_systems.pdf

[22]   Cheng, G., Li, Q., Qi, F., Xiao, B., Liu, S., Hu, Z. and He, P. (2012) Allothermal Gasification of Biomass Using Micron Size Biomass as External Heat Source. Bioresource Technology, 107, 471-475.
http://dx.doi.org/10.1016/j.biortech.2011.12.074

[23]   Saravanakumar, A., Haridasan, T.M., Reed, T.B. and Bai, R.K. (2007) Experimental Investigation and Modelling Study of Long Stick Wood Gasification in a Top Lit Updraft Fixed Bed Gasifier. Fuel, 86, 2846-2856.
http://dx.doi.org/10.1016/j.fuel.2007.03.028

[24]   Patil, K.N., Singh, R.N. and Saiyed, S.U. (2002) Case Study of SPRERI Natural Draft Gasifier Installation at a Ceramic Industry. Biomass and Bioenergy, 22, 497-504.
http://dx.doi.org/10.1016/S0961-9534(02)00009-0

[25]   Anderson, P. (2009) CO and PM Emissions from TLUD Cookstoves. 2009 ETHOS Conference, Kirkland, 23-25 January 2009, Biomass Energy Foundation.
http://stoves.bioenergylists.org/andersontludcopm

[26]   Cedric, B., Piskorz, J. and Berruti, F. (2008) Biomass Valorization for Fuel and Chemicals Production—A Review. International Journal of Chemical Reactor Engineering, 6, 1542-6580.

[27]   Simon, G., Bumpus, A. and Mann, P. (2010) Win-Win Scenarios at the Climate-Development Interface: Challenges and Opportunities for Cookstove Replacement Programs through Carbon Finance Social Science Research Network. Working Paper Series. Global Environmental Change, 22, 275-287.

[28]   Garrett, S. and Hopke, P.K. and Behn, W.H. (2010) A Research Road Map: Improved Cook Stove Development and Deployment for Climate Change Mitigation and Women’s and Children’s Needs.
http://www.pciaonline.org/files/CookStoveResearchRoadMap.pdf

[29]   Qurni, U. and Bachmann, R.T. (2014) Photovoltaic-Battery System to Power Fan-Controlled Rice Husk Gasifier Cooking Stove. Australian Journal of Basic and Applied Sciences, 8, 746-751.

[30]   Anderson, P.S., Reed, T.B. and Wever, P.W. (2007) Micro-Gasification: What It Is and Why It Works. Boiling Point, 53, 35-37.
http://www.hedon.info/docs/BP53-Anderson-14.pdf

[31]   Tinaut, F.V., Melgar, A., Pérez, J.F. and Horrillo, A. (2008) Effect of Biomass Particle Size and Air Superficial Velocity on the Gasification Process in a Downdraft Fixed Bed Gasifier. An Experimental and Modelling Study. Fuel Processing Technology, 89, 1076-1089.
http://dx.doi.org/10.1016/j.fuproc.2008.04.010

[32]   Hossain, M.K., Strezov, V., Chan, K.Y., Ziolkowski, A. and Nelson, P.F. (2011) Influence of Pyrolysis Temperature on Production and Nutrient Properties of Wastewater Sludge Biochar. Journal of Environmental Management, 92, 223228.
http://dx.doi.org/10.1016/j.jenvman.2010.09.008

[33]   Glaser, B., Lehmann, J. and Zech, W. (2002) Ameliorating Physical and Chemical Properties of Highly Weathered Soils in the Tropics with Charcoal—A Review. Biology and Fertility of Soils, 35, 219-230.
http://dx.doi.org/10.1007/s00374-002-0466-4

[34]   Fu, P., Yi, W., Bai, X., Li, Z., Hu, S. and Xiang, J. (2011) Effect of Temperature on Gas Composition and Char Structural Features of Pyrolyzed Agricultural Residues. Bioresource Technology, 102, 8211-8219.
http://dx.doi.org/10.1016/j.biortech.2011.05.083

[35]   Paethanom, A. and Yoshikawa, K. (2012) Influence of Pyrolysis Temperature on Rice Husk Char Characteristics and Its Tar Adsorption Capability. Energies, 5, 4941-4951.
http://dx.doi.org/10.3390/en5124941

[36]   Al-Wabel, M.I., Al-Omran, A., El-Naggar, A.H., Nadeem, M. and Usman, A.R. (2013) Pyrolysis Temperature Induced Changes in Characteristics and Chemical Composition of Biochar Produced from Conocarpus Wastes. Bioresource Technology, 131, 374-379.
http://dx.doi.org/10.1016/j.biortech.2012.12.165

[37]   Enders, A., Hanley, K., Whitman, T., Joseph, S. and Lehmann, J. (2012) Characterization of Biochars to Evaluate Recalcitrance and Agronomic Performance. Bioresource Technology, 114, 644-653.
http://dx.doi.org/10.1016/j.biortech.2012.03.022

[38]   Maschio, G., Koufopanos, C. and Lucchesi, A. (1992) Pyrolysis, a Promising Route for Biomass Utilization. Bioresource Technology, 42, 219-231.
http://dx.doi.org/10.1016/0960-8524(92)90025-S

[39]   Zhang, Y., Li, B., Li, H. and Liu, H. (2011) Thermodynamic Evaluation of Biomass Gasification with Air in Autothermal Gasifiers. Thermochimica Acta, 519, 65-71.
http://dx.doi.org/10.1016/j.tca.2011.03.005

[40]   Meyer, S., Glaser, B. and Quicker, P. (2011) Technical, Economical, and Climate-Related Aspects of Biochar Production Technologies: A Literature Review. Environmental Science & Technology, 45, 9473-9483.
http://dx.doi.org/10.1021/es201792c

[41]   Hernández, J.J., Ballesteros, R. and Aranda, G. (2013) Characterization of Tars from Biomass Gasification: Effect of the Operating Conditions. Energy, 50, 333-342.
http://dx.doi.org/10.1016/j.energy.2012.12.005

[42]   Ryu, C., Yang, Y.B., Khor, A., Yates, N.E., Sharifi, V.N. and Swithenbank, J. (2006) Effect of Fuel Properties on Biomass Combustion: Part I. Experiments—Fuel Type, Equivalence Ratio and Particle Size. Fuel, 85, 1039-1046.
http://dx.doi.org/10.1016/j.fuel.2005.09.019

[43]   Kumar, A., Jones, D.D. and Hanna, M. (2009) Thermochemical Biomass Gasification: A Review of the Current Status of the Technology. Energies, 2, 556-581.
http://dx.doi.org/10.3390/en20300556

[44]   Rapagnà, S., Gallucci, K., Di Marcello, M., Matt, M., Nacken, M., Heidenreich, S. and Foscolo, P.U. (2010) Gas Cleaning, Gas Conditioning and Tar Abatement by Means of a Catalytic Filter Candle in a Biomass Fluidized-Bed Gasifier. Bioresource Technology, 101, 7123-7130.
http://dx.doi.org/10.1016/j.biortech.2010.03.139

[45]   Kiel, J.H.A. and van Paasen, S.V.B. (2004) Tar Formation in a Fluidized Bed Gasifier: Impact of Fuel Properties and Operating Conditions. Report ECN-C-04-013, 1-58.
http://www.ecn.nl/docs/library/report/2004/c04013.pdf

[46]   Yang, H., Yan, R., Chen, H., Zheng, C., Lee, D.H. and Liang, D.T. (2006) In-Depth Investigation of Biomass Pyrolysis Based on Three Major Components: Hemicellulose, Cellulose and Lignin. Energy & Fuels, 20, 388-393.
http://dx.doi.org/10.1021/ef0580117

[47]   Wannapeera, J., Worasuwannarak, N. and Pipatmanomai, S. (2008) Product Yields and Characteristics of Rice Husk , Rice Straw and Corncob During Fast Pyrolysis in a Drop-Tube/Fixed-Bed Reactor. Songklanakarin Journal of Science & Technology, 30, 393-404.

[48]   Demirbas, A., Pehlivan, E. and Altun, T. (2006) Potential Evolution of Turkish Agricultural Residues as Bio-Gas, BioChar and Bio-Oil Sources. International Journal of Hydrogen Energy, 31, 613-620.
http://dx.doi.org/10.1016/j.ijhydene.2005.06.003

[49]   Fushimi, C., Araki, K., Yamaguchi, Y. and Tsutsumi, A. (2003) Effect of Heating Rate on Steam Gasification of Biomass. 2. Thermogravimetric-Mass Spectrometric (TG-MS) Analysis of Gas Evolution. Industrial & Engineering Chemistry Research, 42, 3929-3936.
http://dx.doi.org/10.1021/ie0300575

[50]   Jin, W., Singh, K. and Zondlo, J. (2013) Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method. Agriculture, 3, 12-32.
http://dx.doi.org/10.3390/agriculture3010012

[51]   Lewis, A.D. and Fletcher, T.H. (2013) Prediction of Sawdust Pyrolysis Yields from a Flat-Flame Burner Using the CPD Model. Energy & Fuels, 27, 942-953.
http://dx.doi.org/10.1021/ef3018783

[52]   Fahmi, R., Bridgwater, V., Donnison, I., Yates, N. and Jones, J.M. (2008) The Effect of Lignin and Inorganic Species in Biomass on Pyrolysis Oil Yields, Quality and Stability. Fuel, 87, 1230-1240.
http://dx.doi.org/10.1016/j.fuel.2007.07.026

[53]   Masek, O., Brownsort, P., Cross, A. and Sohi, S. (2013) Influence of Production Conditions on the Yield and Environmental Stability of Biochar. Fuel, 103, 151-155.
http://dx.doi.org/10.1016/j.fuel.2011.08.044

[54]   Crombie, K., Masek, O., Sohi, S.P., Brownsort, P. and Andrew, C. (2013) The Effect of Pyrolysis Conditions on Biochar Stability as Determined by Three Methods. GCB Bioenergy, 5, 122-131.

[55]   Angin, D. (2013) Effect of Pyrolysis Temperature and Heating Rate on Biochar Obtained from Pyrolysis of Safflower Seed Press Cake. Bioresource Technology, 128, 593-597.
http://dx.doi.org/10.1016/j.biortech.2012.10.150

[56]   Maiti, S., Dey, S., Purakayastha, S. and Ghosh, B. (2006) Physical and Thermochemical Characterization of Rice Husk Char as a Potential Biomass Energy Source. Bioresource Technology, 97, 2065-2070.
http://dx.doi.org/10.1016/j.biortech.2005.10.005

[57]   Hu, S., Xiang, J., Sun, L., Xu, M., Qiu, J. and Fu, P. (2008) Characterization of Char from Rapid Pyrolysis of Rice Husk. Fuel Processing Technology, 89, 1096-1105.
http://dx.doi.org/10.1016/j.fuproc.2008.05.001

[58]   Manyà, J.J., Roca, F.X. and Perales, J.F. (2013) TGA Study Examining the Effect of Pressure and Peak Temperature on Biochar Yield during Pyrolysis of Two-Phase Olive Mill Waste. Journal of Analytical and Applied Pyrolysis, 103, 86-95.
http://dx.doi.org/10.1016/j.jaap.2012.10.006

[59]   Manyà, J.J., Ortigosa, M.A., Laguarta, S. and Manso, J.A. (2014) Experimental Study on the Effect of Pyrolysis Pressure, Peak Temperature and Particle Size on the Potential Stability of Vine Shoots-Derived Biochar. Fuel, 133, 163172.
http://dx.doi.org/10.1016/j.fuel.2014.05.019

[60]   Poerschmann, J., Baskyr, I., Weiner, B., Koehler, R., Wedwitschka, H. and Kopinke, F.D. (2013) Hydrothermal Carbonization of Olive Mill Wastewater. Bioresource Technology, 133, 581-588.
http://dx.doi.org/10.1016/j.biortech.2013.01.154

[61]   Liu, Z., Quek, A., Hoekman, S.K. and Balasubramanian, R. (2013) Production of Solid Biochar Fuel from Waste Biomass by Hydrothermal Carbonization. Fuel, 103, 943-949.
http://dx.doi.org/10.1016/j.fuel.2012.07.069

[62]   Masek, O., Budarin, V., Gronnow, M., Crombie, K., Brownsort, P., Fitzpatrick, E. and Hurst, P. (2013) Microwave and Slow Pyrolysis Biochar—Comparison of Physical and Functional Properties. Journal of Analytical and Applied Pyrolysis, 100, 41-48.
http://dx.doi.org/10.1016/j.jaap.2012.11.015

[63]   Larsson, S.H., Rudolfsson, M., Nordwaeger, M., Olofsson, I. and Samuelsson, R. (2013) Effects of Moisture Content, Torrefaction Temperature, and Die Temperature in Pilot Scale Pelletizing of Torrefied Norway Spruce. Applied Energy, 102, 827-832.
http://dx.doi.org/10.1016/j.apenergy.2012.08.046

[64]   Kappe, C.O. (2004) Controlled Microwave Heating in Modern Organic Synthesis. Angewandte Chemie International Edition (in English), 43, 6250-6284.
http://dx.doi.org/10.1002/anie.200400655

[65]   Sun, Y., Gao, B., Yao, Y., Fang, J., Zhang, M., Zhou, Y., Chen, H. and Yang, L. (2014) Effects of Feedstock Type, Production Method, and Pyrolysis Temperature on Biochar and Hydrochar Properties. Chemical Engineering Journal, 240, 574-578.
http://dx.doi.org/10.1016/j.cej.2013.10.081

[66]   Deal, C., Brewer, C.E., Brown, R.C., Okure, M.A.E. and Amoding, A. (2012) Comparison of Kiln-Derived and GasifierDerived Biochars as Soil Amendments in the Humid Tropics. Biomass and Bioenergy, 37, 161-168.
http://dx.doi.org/10.1016/j.biombioe.2011.12.017

[67]   Ozcimen, D. and Karaosmanoglu, F. (2004) Production and Characterization of Bio-Oil and Biochar from Rapeseed Cake. Renewable Energy, 29, 779-787.
http://dx.doi.org/10.1016/j.renene.2003.09.006

[68]   Prasertsan, S. and Krukanont, P. (2003) Implications of Fuel Moisture Content and Distribution on the Fuel Purchasing Strategy of Biomass Cogeneration Power Plants. Biomass and Bioenergy, 24, 13-25.
http://dx.doi.org/10.1016/S0961-9534(02)00088-0

[69]   Roy, P.C., Datta, A. and Chakraborty, N. (2009) Modelling of a Downdraft Biomass Gasifier with Finite Rate Kinetics in the Reduction Zone. International Journal of Energy Research, 33, 833-851.
http://dx.doi.org/10.1002/er.1517

[70]   Demirbas, A. (2004) Effect of Initial Moisture Content on the Yields of Oily Products from Pyrolysis of Biomass. Journal of Analytical and Applied Pyrolysis, 71, 803-815.
http://dx.doi.org/10.1016/j.jaap.2003.10.008

[71]   Mani, S., Tabil, L.G. and Sokhansanj, S. (2006) Effects of Compressive Force, Particle Size and Moisture Content on Mechanical Properties of Biomass Pellets from Grasses. Biomass and Bioenergy, 30, 648-654.
http://dx.doi.org/10.1016/j.biombioe.2005.01.004

[72]   Shin, D. and Choi, S. (2000) The Combustion of Simulated Waste Particles in a Fixed Bed. Combustion and Flame, 121, 167-180.
http://www.sciencedirect.com/science/article/pii/S0010218099001248

[73]   Aldas, R.E. (2009) Integrated Bioenergy Conversion Concepts for Small Scale Gasification Power Systems. Proquest Dissertations and Theses. Ph.D. Thesis, University of California, Davis.

[74]   Guo, X., Xiao, B., Liu, S., Hu, Z., Luo, S. and He, M. (2009) An Experimental Study on Air Gasification of Biomass Micron Fuel (BMF) in a Cyclone Gasifier. International Journal of Hydrogen Energy, 34, 1265-1269.
http://dx.doi.org/10.1016/j.ijhydene.2008.11.107

[75]   Skoulou, V., Koufodimos, G., Samaras, Z. and Zabaniotou, A. (2008) Low Temperature Gasification of Olive Kernels in a 5-kw Fluidized Bed Reactor for H2-Rich Producer Gas. International Journal of Hydrogen Energy, 33, 6515-6524.
http://dx.doi.org/10.1016/j.ijhydene.2008.07.074

[76]   Lv, P.M., Xiong, Z.H., Chang, J., Wu, C.Z., Chen, Y. and Zhu, J.X. (2004) An Experimental Study on Biomass AirSteam Gasification in a Fluidized Bed. Bioresource Technology, 95, 95-101.
http://dx.doi.org/10.1016/j.biortech.2004.02.003

[77]   Zainal, Z.A., Rifau, A., Quadir, G.A. and Seetharamu, K.N. (2002) Experimental Investigation of a Downdraft Biomass Gasifier. Biomass and Bioenergy, 23, 283-289.
http://dx.doi.org/10.1016/S0961-9534(02)00059-4

[78]   Garcia-Bacaicoa, P., Bilbao, R., Arauzo, J. and Salvador, M.L. (1994) Scale-Up of Downdraft Moving Bed Gasifiers (25-300 kg/h)—Design, Experimental Aspects and Results. Bioresource Technology, 48, 229-235.
http://dx.doi.org/10.1016/0960-8524(94)90151-1

[79]   FAO (1985) Industrial Charcoal Making. FAO Forestry Department, Rome.

[80]   Hatzilyberis, K.S. (2011) Design of an Indirect Heat Rotary Kiln Gasifier. Fuel Processing Technology, 92, 2429-2454.
http://dx.doi.org/10.1016/j.fuproc.2011.08.004

[81]   Bates, E. (2007) Good Technologies…But Do They Really Work? Boiling Point, 53, 3-5.
http://www.hedon.info/docs/BP53-Bates-2.pdf

[82]   Panwar, N.L. and Rathore, N.S. (2008) Design and Performance Evaluation of a 5kw Producer Gas Stove. Biomass and Bioenergy, 32, 1349-1352.
http://dx.doi.org/10.1016/j.biombioe.2008.04.007

[83]   Bantelay, D.T. and Nigus, G. (2014) Design, Manufacturing and Performance Evaluation of House Hold Gasifier Stove: A Case Study of Ethiopia. American Journal of Energy Engineering, 2, 96-102.
http://dx.doi.org/10.11648/j.ajee.20140204.12

[84]   Ojolo, S.J., Abolarin, S.M. and Adegbenro, O. (2012) Development of a Laboratory Scale Updraft Gasifier. International Journal of Manufacturing Systems, 2, 21-42.
http://dx.doi.org/10.3923/ijmsaj.2012.21.42

[85]   Downie, A., Munroe, P., Cowie, A., van Zwieten, L. and Lau, D.M.S. (2012) Biochar as a Geoengineering Climate Solution: Hazard Identification and Risk Management. Critical Reviews in Environmental Science and Technology, 42, 225-250.
http://dx.doi.org/10.1080/10643389.2010.507980

[86]   Cherubini, F., Bird, N.D., Cowie, A., Jungmeier, G., Schlamadinger, B. and Woess-Gallasch, S. (2009) Energyand Greenhouse Gas-Based LCA of Biofuel and Bioenergy Systems: Key Issues, Ranges and Recommendations. Resources, Conservation and Recycling, 53, 434-447.
http://dx.doi.org/10.1016/j.resconrec.2009.03.013

[87]   Maccarty, N., Still, D. and Ogle, D. (2010) Fuel Use and Emissions Performance of Fifty Cooking Stoves in the Laboratory and Related Benchmarks of Performance. Energy for Sustainable Development, 14, 161-171.
http://dx.doi.org/10.1016/j.esd.2010.06.002

[88]   Ballard-Tremeer, G. and Jawurek, H.H. (1996) Comparison of Five Rural Wood-Burning Cooking Devices: Efficiencies and Emissions. Biomass and Bioenergy, 11, 419-430.
http://dx.doi.org/10.1016/S0961-9534(96)00040-2

[89]   Ballard-Tremeer, G. (1997) Emissions of Rural Wood-Burning Cooking Devices. A Thesis Submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in Fulfilment of the Requirements for the Degree of Doctor of Philosoph
http://www.ecoltdgroup.com/wp-content/uploads/2011/12/PhDThesis_GrantBallard-Tremeer.pdf

[90]   Zhang, J.J. and Morawska, L. (2002) Combustion Sources of Particles: 2. Emission Factors and Measurement Methods. Chemosphere, 49, 1059-1074.
http://dx.doi.org/10.1016/S0045-6535(02)00240-0

[91]   Ahuja, D.R., Joshi, V., Smith, K.R. and Venkataraman, C. (1987) Thermal Performance and Emission Characteristics of Unvented Biomass-Burning Cookstoves: A Proposed Standard Method for Evaluation. Biomass, 12, 247-270.
http://dx.doi.org/10.1016/0144-4565(87)90039-4

[92]   Butcher, S., Smith, R. and Osborn, J.F. (1984) Emission Factors and Efficiencies for Small-Scale Open Biomass Combustion: Toward Standard Measurement Techniques. 122-128.
https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/29_6_PHILADELPHIA_08-84_0122.pdf

[93]   Cao, G., Zhang, X., Gong, S. and Zheng, F. (2008) Investigation on Emission Factors of Particulate Matter and Gaseous Pollutants from Crop Residue Burning. Journal of Environmental Sciences (China), 20, 50-55.
http://dx.doi.org/10.1016/S1001-0742(08)60007-8

[94]   Darley, E.F., Burleson, F.R., Mateer, E.H., Middleton, J.T. and Osterli, V.P. (1966) Contribution of Burning of Agricultural Wastes to Photochemical Air Pollution. Journal of the Air Pollution Control Association, 16, 685-690.
http://dx.doi.org/10.1080/00022470.1966.10468533

[95]   Janvijitsakul, K. and Kuprianov, V.I. (2008) Major Gaseous and PAH Emissions from a Fluidized-Bed Combustor Firing Rice Husk with High Combustion Efficiency. Fuel Processing Technology, 89, 777-787.
http://dx.doi.org/10.1016/j.fuproc.2008.01.013

[96]   Albina, D.O. (2006) Emissions from Multiple-Spouted and Spout-Fluid Fluidized Beds Using Rice Husks as Fuel. Renewable Energy, 31, 2152-2163.
http://dx.doi.org/10.1016/j.renene.2006.02.013

[97]   Kuprianov, V.I., Kaewklum, R., Sirisomboon, K., Arromdee, P. and Chakritthakul, S. (2010) Combustion and Emission Characteristics of a Swirling Fluidized-Bed Combustor Burning Moisturized Rice Husk. Applied Energy, 87, 2899-2906.
http://dx.doi.org/10.1016/j.apenergy.2009.09.009

[98]   Thao, P.T.M., Kurisu, K.H. and Hanaki, K. (2011) Greenhouse Gas Emission Mitigation Potential of Rice Husks for An Giang Province, Vietnam. Biomass and Bioenergy, 35, 3656-3666.
http://dx.doi.org/10.1016/j.biombioe.2011.05.023

[99]   Galinato, S.P., Yoder, J.K. and Granatstein, D. (2011) The Economic Value of Biochar in Crop Production and Carbon Sequestration. Energy Policy, 39, 6344-6350.
http://dx.doi.org/10.1016/j.enpol.2011.07.035

[100]   Torres-Rojas, D., Lehmann, J., Hobbs, P., Joseph, S. and Neufeldt, H. (2011) Biomass Availability, Energy Consumption and Biochar Production in Rural Households of Western Kenya. Biomass and Bioenergy, 35, 3537-3546.
http://dx.doi.org/10.1016/j.biombioe.2011.05.002

[101]   Luoga, E., Witkowski, E.T. and Balkwill, K. (2000) Economics of Charcoal Production in Miombo Woodlands of Eastern Tanzania: Some Hidden Costs Associated with Commercialization of the Resources. Ecological Economics, 35, 243-257.
http://dx.doi.org/10.1016/S0921-8009(00)00196-8

[102]   Islam, M.N. and Ani, F.N. (2000) Techno-Economics of Rice Husk Pyrolysis, Conversion with Catalytic Treatment to Produce Liquid Fuel. Bioresource Technology, 73, 67-75.
http://dx.doi.org/10.1016/S0960-8524(99)00085-1

[103]   Roberts, K.G., Gloy, B.A., Joseph, S., Scott, N.R. and Lehmann, J. (2010) Life Cycle Assessment of Biochar Systems: Estimating the Energetic, Economic, and Climate Change Potential. Environmental Science & Technology, 44, 827833.
http://dx.doi.org/10.1021/es902266r

[104]   Shabangu, S., Woolf, D., Fisher, E.M., Angenent, L.T. and Lehmann, J. (2014) Techno-Economic Assessment of Biomass Slow Pyrolysis into Different Biochar and Methanol Concepts. Fuel, 117, 742-748.
http://dx.doi.org/10.1016/j.fuel.2013.08.053

[105]   Granatstein, D., Collins, H., Garzia-Perez, M. and Yuder, J. (2009) Use of Biochar from Pyrolysis of Waste Organic Material as a Soil Amendment. Final Report, Center for Sustaining Agriculture and Natural Resources, Washington State University, Washington, 168.

 
 
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