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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;Sabienė, Nomeda;Zaleckas, Ernestas
Title: Fractionation of trace metals in anaerobic digestate
Is part of: VIII International Scientific Conference : Toxic substances in the environment : Krakow, Poland, 14-15 September 2017 : book of abstracts. Krakow: Department of Agricultural and Environmental Chemistry University of Agriculture in Krakow, 2017
Extent: p. 95-95
Date: 2017
Keywords: Trace metals;Anaerobic digestate;Fractionation;Bioavailability;Accumulation
ISBN: 9788394896508
Abstract: Landfilling of organic waste in EU is steadily decreasing, while the use of anaerobic digestion to recover energy and plant nutrients from biowaste is forecast to increase significantly (Bhavisha et. al., 2017). Anaerobic digestate (AD) – a by-product of anaerobic digestion can be used in agriculture or forestry as an organic fertiliser and soil conditioner. When application to agricultural land is not feasible, AD can be alternatively used for land reclamation. Various types of biowaste substrates can be used as feedstock for anaerobic biogas production: sewage sludge; organic fraction of municipal waste; green waste; agricultural residues and by-products; organic waste from food processing industry; animal manures and slurries, etc. In most cases, different types of biowaste are co-digested and the qualitative characteristics, including trace metal (TM) content in AD, are strongly dependent upon the feedstock used. After anaerobic digestion TM can be released into the environment via different routes of entry either suspended/dissolved in effluents or in a form of a solid biomass product (biosolids). On-land application of contaminated digestate poses a great concern because soil acts as a transferor, and due to bioaccumulation TM can appear in a food chain (Castro et. al. 2009). Unfortunately, the fate, chemical speciation as well as transport of trace metals in soil environment are far from being understood. This work aims to understand TM chemical speciation, mobility as well as potential bioavailability before and after anaerobic digestion of municipal wastewater sewage sludge. Seeking to predict mobility as well as potential bioavailability of TM in the sludge, sequential extraction procedure was applied before/after anaerobic treatment, and vegetative pot experiment with lettuce (Lactuca sativa L.) was carried out in greenhouse conditions. Significant differences were found in trace metal speciation due to anaerobic treatment
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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