Column leaching from a Danish forest soil amended with wood ashes: fate of major and trace elements

Abstract

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Wood biomass fly ash ameliorates acidic, low-nutrient hydromorphic soil & reduces metal accumulation in maize

“…Regarding the mineralogical composition, tested fly ash contained mostly calcite (CaCO3), quartz (SiO2), lime (CaO), portlandite (Ca(OH)2), potassium oxide (K2O), periclase (MgO), arcanite (K2SO4) and smaller proportions of other minerals such as aluminium/ferric oxides (Table S2; Figure 1D); these findings are in agreement with the recent studies (Maresca et al, 2017;Carević et al, 2019;Tosti et al, 2019) on using ash material as a potential soil amendment in i) non-contaminated agro-or forest ecosystems (e.g., Maresca et al, 2018) or ii) metalcontaminated soils (Gu et al, 2011;Leclercq-Dransart et al, 2019). Fly ash mineralogy is highly dependent on the biomass type (Vassilev et al, 2013); however, by manipulating (combining) different fuel sources/types it is possible to influence the composition of mineral ash matrices, making them suitable for specific purposes.…”

Biomass bottom ash & dolomite similarly ameliorate an acidic low-nutrient soil, improve phytonutrition and growth, but increase Cd accumulation in radish

“…The previously tested natural soil conditioner was purchased as a commercial product (Agrocal Ca+Mg powder, Holcim Ltd.), originating from the Istrian stonepits (Croatia) (Figure S1) and mostly containing sedimentary dolomite (DO). Before further examination, BA and DO-based soil conditioner samples were passed through a 50 µm inox sieve and characterised physicochemically according to the procedures and methods described by Maresca et al (2018) and Tosti et al (2018). In brief, mineralogy content of BA and DO was examined by using Xray diffraction (XRD6000, Shimadzu, Japan), their elemental composition was determined by X-ray fluorescence (S4 Pioneer, Bruker AXS, Germany), losses by ignition (at 550 and 1100° C) were determined gravimetrically, total C and N content were determined after dry combustion using a CN Analyser (Thermo Fisher Scientific, USA), polycyclic aromatic hydrocarbons (PAHs; 14 different species) were extracted by hexane and examined by a gas chromatography mass detector (Agilent GC System 7890B and 5977A, USA), and the pH reaction and electrical conductivity of BA or DO water eluates were measured as explained previously for soil samples.…”

Biomass in an industrial boiler: characterizing and reducing waste from the burning process

“…Legislation and guidelines may vary according to countries or regions. Some countries limit the amount it can be used each time the ash is applied, and some countries limit the total use for a specific area (CCME, 2021;Maresca, et al, 2018). The slow release of the nutrients into the soil is a common effect of ash application and constitutes a beneficial characteristic because it can improve organism and plant development (Kataki, et al, 2017;Liang, et al, 2020).…”