Thermogravimetric Analysis of Swine Manure Solids Obtained from Farrowing, and Growing-Finishing Farms


The modern trend of increasing the number of pigs at production sites led to a noticeable surplus of manure. Separation of manure solids provides an avenue of their utility via thermochemical conversion techniques. Therefore, the goal of this paper was to assess the physical and thermal properties of solid separated swine manure obtained from two different farms, i.e., farrowing, and growing-finishing, and to determine their pyrolysis kinetic parameters. Swine manure solids were dried and milled prior to assessing their properties. Differential and integral isoconversional methods (Friedman, and Flynn-Wall-Ozawa) were used to determine the apparent activation energy as a function of the conversion ratio. Significant differences were observed in the proximate, ultimate composition between both manure types. The higher heating value (HHV) for the manure solids from farrowing, and growing-finishing farms reached 16.6 MJ/kg and 19.4 MJ/kg, respectively. The apparent activation energy computed using Friedman and FWO methods increased with the increase in the degree of conversion. Between 10% and 40% degrees of conversion, the average activation energies, using Friedman method, were103 and 116 kJ/mol for the farrowing and growing-finishing manure solids, respectively. On the other hand, the same activation energies, calculated from FWO method, were 98 and 104 kJ/mol, for solid manure obtained from farrowing and growing-finishing farms, respectively. The findings in this study will assist in the effort to optimize thermochemical conversion processes to accommodate swine waste. This could, in turn, minimize swine production impacts on the surrounding ecologies and provide sustainable energy and biochar streams.

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Sharara, M. and Sadaka, S. (2014) Thermogravimetric Analysis of Swine Manure Solids Obtained from Farrowing, and Growing-Finishing Farms. Journal of Sustainable Bioenergy Systems, 4, 75-86. doi: 10.4236/jsbs.2014.41008.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] McGlone, J. (2013) The Future of Pork Production in the World: Towards Sustainable, Welfare-Positive Systems. Animals, 3, 401-415.
[2] NASS-USDA (2013) Quarterly Hogs and Pigs.
[3] Tilman, D., Cassman, K., Matson, P., Naylor, R. and Polasky, S. (2002) Agricultural Sustainability and Intensive Production Practices. Nature, 418, 671-677.
[4] American Society of Agricultural and Biological Engineers (ASABE) (2005) Standard D3843.2—Manure Production and Characteristics.
[5] Burton, C. (2007) The Potential Contribution of Separation Technologies to the Management of Livestock Manure. Livestock Science, 112, 208-216.
[6] Møller, H., Hansen, J. and Sørensen, C. (2007) Nutrient Recovery by Solid-Liquid Separation and Methane Productivity of Solids. Transactions of ASABE, 50, 193-200.
[7] Ro, K., Cantrell, K. and Hunt, P. (2010) High-Temperature Pyrolysis of Blended Animal Manures for Producing Renewable Energy and Value-Added Biochar. Industrial & Engineering Chemistry Research, 49, 10125-10131.
[8] Park, M., Kumar, S. and ChangSix, R. (2012) Solid Waste from Swine Wastewater as a Fuel Source for Heat Production. Asian-Australasian Journal of Animal Sciences, 25, 1627-1632.
[9] Wnetrzak, R., Kwapinski, W., Peters, K., Sommer, S., Jensen, L. and Leahy, J. (2013) The Influence of the Pig Manure Separation System on the Energy Production Potentials. Bioresource Technology, 136, 502-508.
[10] Font-Palma, C. (2012) Characterisation, Kinetics and Modelling of Gasification of Poultry Manure and Litter: An Overview. Energy Conversion and Management, 53, 92-98.
[11] Sweeten, J., Heflin, K., Auvermann, B., Annamalai, K. and McCollum, F. (2013) Combustion Fuel Properties of Manure and Compost from Paved and Unpaved Cattle Feedlots as Modified by Annual Precipitation. Transactions of the ASABE, 56, 279-294.
[12] Jenkins, B., Baxter, L., Miles Jr., T. and Miles, T. (1998) Combustion Properties of Biomass. Fuel Processing Technology, 54, 17-46.
[13] Singh, K., Risse, M., Worley, J., Das, K. and Thompson, S. (2008) Effect of Fractionation on Fuel Properties of Poultry Litter. Applied Engineering in Agriculture, 24, 383-388.
[14] Ro, K., Cantrell, K., Hunt, P., Ducey, T., Vanotti, M. and Szogi, A. (2009) Thermochemical Conversion of Livestock Wastes: Carbonization of Swine Solids. Bioresource Technology, 100, 5466-5471.
[15] Otero, M., Sánchez, M. and Gómez, X. (2011) Co-Firing of Coal and Manure Biomass: A TG-MS Approach. Bioresource Technology, 102, 8304-8309.
[16] Vyazovkin, S. and Wight, C. (1999) Model-Free and Model-Fitting Approaches to Kinetic Analysis of Isothermal and Nonisothermal Data. Thermochimica Acta, 340-341, 53-68.
[17] ASTM Standard D 2974 (2007) Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils. ASTM D2974-07a.
[18] ASTM Standard D5865 (2012) Standard Test Method for Gross Calorific Value of Coal and Coke. D5865-12.
[19] Galwey, A. and Brown, M. (1998) Kinetic Background to Thermal Analysis and Calorimetry. In: Handbook of Thermal Analysis and Calorimetry, Chapter 3, Vol. 1, Elsevier Service B.V., Amsterdam, 147-224.
[20] Zhou, D. and Grant, D. (2004) Model Dependence of the Activation Energy Derived from Nonisothermal Kinetic Data. The Journal of Physical Chemistry, 108, 4239-4246.
[21] Cai, J. and Bi, L. (2009) Kinetic Analysis of Wheat Straw Pyrolysis Using Isoconversional Methods. Journal of Thermal Analysis and Calorimetry, 98, 325-330.
[22] Friedman, H. (1964) Kinetics of Thermal Degradation of Char-Foaming Plastics from Thermogravimetry: Application to a Phenolic Plastic. Journal of Polymer Science Part C: Polymer Symposia, 6, 183-195.
[23] Flynn, J.H. and Wall, L.A. (1966) General Treatment of the Thermogravimetry of Polymers. Journal of Research of National Bureau of Standards-A. Physics and Chemistry, 70A, 487-523.
[24] Ozawa, T. (1965) A New Method of Analyzing Thermogravimetric Data. Bulletin of the Chemical Society of Japan, 38, 1881-1886.
[25] Doyle, C. (1962) Estimating Isothermal Life from Thermogravimetric Data. Journal of Applied Polymer Science, 6, 639-642.
[26] Mariotti, F., Tomé, D. and Mirand, P. (2008) Converting Nitrogen into Protein—Beyond 6.25 and Jones’ Factors. Critical Reviews in Food Science and Nutrition, 48, 177-184.
[27] Demirbas, A. (1997) Calculation of Higher Heating Values of Biomass Fuels. Fuel, 76, 431-434.
[28] Yang, H., Yan, R., Chen, H., Zheng, C., Lee, D. and Liang, D. (2006) In-Depth Investigation of Biomass Pyrolysis Based on Three Major Components: Hemicellulose, Cellulose and Lignin. Energy and Fuels, 20, 388-393.
[29] Møller, H., Sommer, S. and Ahring, B. (2004) Methane Productivity of Manure, Straw and Solid Fractions of Manure. Biomass and Bioenergy, 26, 485-495.
[30] Yao, F., Wu, Q., Lei, Y., Guo, W. and Xu, Y. (2008) Thermal Decomposition Kinetics of Natural Fibers: Activation Energy with Dynamic Thermogravimetric Analysis. Polymer Degradation and Stability, 93, 90-98.
[31] Xiu, S., Zhang, Y. and Shahbazi, A. (2009) Swine Manure Solids Separation and Thermochemical Conversion to Heavy Oil. BioResources, 4, 458-470.
[32] Brebu, M. and Spiridon, I. (2011) Thermal Degradation of Keratin Waste. Journal of Analytical and Applied Pyrolysis, 91, 288-295.
[33] Maddi, B., Viamajala, S. and Varanasi, S. (2011) Comparative Study of Pyrolysis of Algal Biomass from Natural Lake Blooms with Lignocellulosic Biomass. Bioresource Technology, 102, 11018-11026.
[34] Draman, S., Daik, R., Latif, F. and El-Sheikh, S. (2013) Characterization and Thermal Decomposition Kinetics of Kapok (Ceiba pentandra L.)–Based Cellulose. BioResources, 9, 8-23.
[35] Shuping, Z., Yulong, W., Mingde, Y., Chun, L. and Junmao, T. (2010) Pyrolysis Characteristics and Kinetics of the Marine Microalgae Dunaliella tertiolecta Using Thermogravimetric Analyzer. Bioresource Technology, 101, 359-365.
[36] Simon, P. (2004) Isoconversional Methods. Journal of Thermal Analysis and Calorimetry, 76, 123-132.

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