Characterization of biochars from different sources and evaluation of release of nutrients and contaminants

Natália Aragão de Figueredo, Liovando Marciano da Costa, Leônidas Carrijo Azevedo Melo, Evair Antônio Siebeneichlerd, Jairo Tronto


The biochar, product of pyrolysis of organic waste, has been used as a soil conditioner and alternative on solid waste management. However, the raw material and pyrolysis temperature used influence the quantity and dynamics of release of nutrients and contaminants from the biochar. The objective wasto evaluate the use of waste sugarcane bagasse, eucalyptus and sewage sludge for production of biochar and determine the chemical, physical, mineralogical properties and acid extraction of these materials produced at 350 °C and 500 °C. Were evaluated the proportion of C, H, N, O; ashes; macro and micronutrients, plus some contaminants; characterization of mineral phases by diffractometry of X- rays; functional groups by infrared absorption spectroscopy (FTIR). Moreover, it was determined the release of nutrients and contaminants for the extraction in increasing concentration of HNO3 (0,01 - 2,0 mol L-1). The O/C and H/C relations decreased with increasing temperature of pyrolysis, which define a greater stability of the C of biochars. Sewage sludge biochar (BC-L) had the highest nutrient release rates and contaminant metals (Cd, Cr, Ni and Pb). Acid extraction of other biocarvões was very low (<20% of the total content). The results indicate that the carbon fraction of biochar contributes to the low rateof release of the elements in acid place.


Biochar; Waste; Acid extraction

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AMARAL SOBRINHO, al.Metais pesados em alguns fertilizantes e corretivos. Revista Brasileira de Ciência do Solo,v. 16, n. 2, p. 271-276, 1992.

BOEHM, H.-P. Surface chemical characterization of carbons from adsorption studies. In: BOTTANI, E.J.; TASCÓN, J.M.D. (Ed.). Adsorption by carbons. Amsterdam:Elsevier, 2008. p. 301-328.

CASE, al. Biochar suppresses N2O emissions while maintaining N availability in a sandy loam soil. Soil Biology and Biochemistry, v. 81, p. 178-185, 2015.

CHEN, D. et al. Effect of pyrolysis temperature on the chemical oxidation stability of bamboo biochar. Bioresource Technology, v. 218, p. 1303-1306, 2016.

DEMIRBAS, A. Determination of calorific values of biochars and pyrolysis from pyrolysis of beech trunkbarks. Journal of Analytical and Applied Pyrolysis, v. 72, n. 2, p. 215-219, 2004.

GARCIA-PEREZ, M. et al. Fast pyrolysis of oil mallee woody biomass:effect of temperature on the yield and quality of pyrolysis products. Industrial & Engineering Chemistry Research, v. 47, n. 6, p. 1846-1854, 2008.

GASKIN J.W. et al. Effect of low temperature pyrolysis conditions on biochars for agricultural use. Transactions of the Asabe, v. 51, n. 6, p. 2061-2069, 2008.

GLASER, B. et al. The Terra Preta phenomenon - a model for sustainable agriculture in the humid tropics. Naturwissens chaften. v. 88, p. 37-41, 2001.

GRAY, M. et al. Water uptake in biochars: the roles of porosity and hydrophobicity. Biomass and Bioenergy, v. 61, p. 196-205, 2014.

HOSSAIN, M.K. et al. Influence of pyrolysis temperature on production and nutrient properties of wastewater sludge biochar. Journal of Environmental Management, v. 92, n. 1, p. 223-228, 2011.

HUANLIANG, L. et al. Characterization of sewage sludge-derived biochar from different feedstocks and pyrolysis temperatures. Journal of Analytical and Applied Pyrolysis, v. 102, p. 137-143, 2013.

HWANG, I.H. et al. Characteristics of leachate from pyrolysis residue of sewage sludge. Chemosphere, v. 68, n. 10, p. 1913-1919, 2007.

KEILUWEIT, al. Dynamic molecular structure of plant biomass-derived black carbon (Biochar). Environmental Science & Technology, v. 44,n. 4, p. 1247-1253, 2010.

KOOKANA, R.S. et al. Biochar application to soil:agronomic and environmental benefits and unintended consequences. Advances in Agronomy,, v. 112, p. 103-143, 2011.

LEHMANN, J. et al. Biochar effects on soil biota:a review. Soil Biology and Biochemistry, v. 43, n. 9, p. 1812-1836, 2011.

MENDONÇA, E.S; MATOS, E.S. Matéria orgânica do solo: métodos de análise. Viçosa, MG: UFV, 2005. 107 p.

MITCHELL, P.J. et al. Shifts in microbial communityand water-extractable organic matter composition with biochar amendment in a temperate forest soil. Soil Biology and Biochemistry, v. 81, p. 244-254, 2015.

NGUYEN, B.T. et al. Temperature sensitivity of black carbon decomposition and oxidation. Environmental Science & Technology, v. 44, n. 9, p. 3324-3331, 2010.

OLIVEIRA, C. et al. Solubilidade de metais pesados em solos tratados com lodo de esgoto enriquecido. Revista Brasileira da Ciência do Solo, v. 27, n. 1, p. 171-181, 2003.

REEVES, J.B. et al. Near infrared spectroscopic examination of charred pine wood, bark, cellulose and lignin: implications for the quantitative determination of charcoal in soils. Journal Near Infrared Spectroscopy,v. 15, p. 307-315, 2007.

SONG, W.; GUO, M. Quality variations of poultry litter biochar generated at different pyrolysis temperatures. Journal of Analytical and Applied Pyrolysis, v. 94, p. 138-145, 2012.

UCHIMIYA, M.; CHANG, S.C. Screening biochars for heavy metal retention in soil: role of oxygen functional groups. Journal of Hazardous Materials,v. 190, n. 1/3, p. 432-441, 2011.

ZHANG, L., CHUNBAO, C., XU, P.C. Overview of recent advances in thermo-chemical conversion of biomass. Energy Conversion and Management,v.51, n. 5, p. 969-982, 2010.

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