Critical aspects of biomass ashes utilization in soils: Composition, leachability, PAH and PCDD/F

Waste Management
M FreireLuís A C Tarelho

Abstract

Bottom and fly ashes streams collected along a year in several biomass thermal plants were studied. The bulk composition of ashes and other chemical characteristics that may impact soil application showed a high variability depending on the ash stream, combustion technology and ash management practice at the power plants. The acid neutralization capacity (ANC) and metal's availability for leaching at fixed pH 7 and 4 was performed according with EA NEN 7371, as a quick evaluation method to provide information on the long-term behavior of ashes, regarding heavy metals and also plant nutrients release. Also the pH dependence leachability study was performed according to CEN/TS 14429 for predicting the leaching behavior under different scenarios. Leachability profiles were established between pH 3 and 12, allowing to distinguish different solubility control phenomena of toxic heavy metals (Cu, Cr, Mn, Ni, Zn, Pb) as well as other salts (Ca, K, Mg, Na, Cl). The ANC of fly ashes at pH 4 (3.6-9.6 molH(+)/kg) were higher than that observed for the bottom ashes (1.2-2.1 molH(+)/kg). Ashes were also characterized for persistent organic pollutants (POP), such as polycyclic aromatic hydrocarbons (PAH) and paradibenzodioxines and furanes (...Continue Reading

References

Jun 22, 2006·Environmental Science & Technology·Thomas AstrupThomas H Christensen
Jul 7, 2007·Environmental Science & Technology·Maryam MahmoudkhaniHans Theliander
Aug 28, 2007·Environmental Pollution·Anja EnellGunnar Thelin
Jan 2, 2008·Journal of Hazardous Materials·Nee Sun Choong Kwet Yive, Megalei Tiroumalechetty
Apr 15, 2008·Bioresource Technology·F CabralE Vasconcelos
May 1, 2010·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Heidrun MoserRoland Becker

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Citations

Oct 9, 2016·Waste Management·Ana Isabel MorenoJuan A Conesa
Mar 29, 2018·Scientific Reports·Wagner de Oliveira GarciaJens Hartmann
Apr 14, 2018·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Valerio PaoliniAngelo Cecinato
Sep 5, 2020·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Kristina BunevicieneJonas Baltrusaitis
Apr 4, 2021·Materials·Ana BaričevićKeti Kristović

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