The Physicochemical Properties and Composition of Biomass Ash and Evaluating Directions of its Applications
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Department of Inorganic and Analytical Chemistry, Rzeszów University of Technology, Rzeszów, Poland
Online publish date: 2018-06-25
Publish date: 2018-07-09
Submission date: 2017-10-03
Final revision date: 2017-11-14
Acceptance date: 2017-11-28
Pol. J. Environ. Stud. 2018;27(6):2593–2603
We researched industrial wood ash in order to assess its posed threats and possible applications. The ash is type S; due to the content of SiO2, CaO, Al2O3, Kb>2O, Fe2O3, Na2O, MgO, SO3, and TiO2 it is alkaline (pH = 12.9) with small bulk density (<1.4 g/mL); and it is characterized by high fragmentation and irregularly shaped grains (research SEM/EDS). It has a high cationic-exchange capacity (56 mmol/100 g) and a negatively-charged surface (pH>pHPZC), which suggests the possibility of sorption cations. Research of the structure of phases present in the ash (FT-IR method) and physical or chemical changes with their accompanied thermal effects in the temperature range 25-900º (TG/DTG method) indicate no degradation of aluminum-silicon skeletons. Metals occur inside and in the surface layer of the grain (FAAS, SEM/EDS analyses). Research of fractionation of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn (classic Tessier’s method) indicated high mobility among others (Co 28.44%, Cr 20.49%, and Pb 16.51%), which poses a risk of environmental pollution. The obtained results indicate 2 directions of ash application: (i) limited environmental due to heavy metal and (ii) processing in geopolymer.
Jan Kalembkiewicz   
Politechnika Rzeszowska, Wydział Chemiczny, Zakład Chemii Nieorganicznej i Analitycznej, al. Powstanców Warszawy 6, 35-959 Rzeszów, Poland