A simultaneous assessment of organic matter and trace elements bio-accessibility in substrate and digestate from an anaerobic digestion plant. (September 2019)

• Record Type: Journal Article
• Authors: Laera, Andreina; Shakeri Yekta, Sepehr; Hedenström, Mattias; Buzier, Rémy; Guibaud, Gilles; Dario, Mårten; Esposito, Giovanni; van Hullebusch, Eric D.
• Is Part Of: Bioresource technology. Volume 288(2019)
• Publication Date: 2019-09
• Subjects: Sequential chemical extraction -- Organic matter fractionation -- Trace elements fractionation -- NMR spectroscopy -- Anaerobic co-digestion; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.121587
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Bio-accessible trace elements are assessed by an organic matter (OM) fractionation method. The fractionation method is evaluated with solid and solution-state NMR spectroscopy. Trace elements distribution is studied in each OM fraction. Reagents used for SPOM and REOM extraction are not enough selective to extract OM. Between 31% and 98% of total elements are associated with the mineral fraction. Abstract: This study evaluates a simultaneous assessment of organic matter (OM) and trace elements (TE) bio-accessibility in substrate and digestate from a full-scale anaerobic digester by a sequential OM extraction method. Simultaneous release of TE was determined along with the extraction of different OM fractions and the effects of extracting reagents on characteristics of OM were evaluated by nuclear magnetic resonance (NMR) spectroscopy. The reagents used for sequential extraction of OM were not enough selective. However, proteins were particularly removed by 0.1 M NaOH, while 72% H2 SO4 mainly extracted hemicellulose and cellulose. The OM fractionation allowed for simultaneous extraction of >60% of total As, Cd, Co, Fe, Mn, Ni and Zn, while the extraction was limited for Al, Cr, Cu, Mo, and Pb. In substrate, >50% of total As, Co, Mn and Ni and <40% of total Fe, Zn and Mo were identified in bio-accessible fractions. In digestate, all elements demonstrated poor bio-accessibility except for As.