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Type of publication: Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Paulauskas, Valdas;Kasiulienė, Alfreda
Title: Trace metals in anaerobic biomass digestate
Is part of: Biosystems Engineering : 10th International Conference, May 8-10, 2019 in Tartu, Estonia: Book of Abstracts. Tartu : Estonian University of Life Sciences, 2019
Extent: p. 79-79
Date: 2019
Keywords: Anaerobic digestate;Trace metals;Fractionation
ISBN: 9789949536818
Abstract: One of the most abundant sources for alternative energy is biomass. Energy can be produced either by direct biomass combustion or alternatively using anaerobic biogas production technologies. Digestate – a by-product of anaerobic digestion can be used in agriculture or forestry as an organic fertiliser. However, due to the elevated concentrations of trace metals on-land application of the digestate can be restricted. Furthermore, the fate, chemical speciation as well as transport of trace metals in environments - often agricultural lands – is far from being understood. Metal species are formed exclusively in the extremely reducing, organic and metal rich conditions in anaerobic bioreactors. After anaerobic digestion trace metals are released into the environment via different routes of entry either suspended/dissolved in effluents or in a form of a solid biomass product. Once outside the reducing conditions of anaerobic fermenters, they will face oxidizing conditions that will influence their transformation to other thermodynamically stable species. This work aims to understand trace metal chemical speciation, redox-stability, sorption, mobility as well as bioavailability both in anaerobic technologies and in the soil environment. The total metal concentration, the conditions during digestion such as pH and redox potential, and the kinetics of reduction, precipitation, complexation, and adsorption are expected to play a key role influencing the chemical speciation of microelements in the digestate. To realize this aim, trace metal fractionation experiment was performed. Trace metal concentration and speciation was dependent upon the type of biomass used in the biogas reactor. The increasing pH decreased solubility of metals in the matrix. There were found significant differences in trace metal speciation between anaerobic environment and oxidising conditions
Affiliation(s): Miškų ir ekologijos fakultetas
Proj. "Vilko ekologijos tyrimai"
Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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