AI Article Synopsis
- - This study explores the availability of essential (like Co, Fe, Ni, Zn, Mn, Cu) and non-essential metals (like Pb, Cr, Cd) during anaerobic digestion of pig manure and maize.
- - Researchers used a Modified BCR sequential extraction method over 45 days to analyze how metal speciation relates to digestion variables.
- - Findings show that metals like Cr, Cu, Fe, and Pb were mainly tied to the oxidisable fraction, while Zn, Mn, and Cd had varying availability, influenced by factors like pH and feedstock chemistry in co-digestion.
Article Abstract
This study aims to analyse the potential availability of essential metals including as Co, Fe, Ni, Zn, Mn, and Cu and non-essential metals such as Pb, Cr, and Cd within anaerobic mono- and co-digestion of pig manure and maize. The metals partitioning was determined using the Modified BCR (European Community Bureau of Reference) sequential extraction at defined intervals over a 45-days period, correlating changes in metals speciation with key digestion variables. The findings revealed that Cr, Cu, Fe, and Pb were predominantly associated with the oxidisable fraction, while Zn, Mn, and Cd were potentially available in both processes. Notably, NH-N and the VFAs, except propionic acid, correlated significantly with the available fractions of Co, Mn, Ni, Zn, Cr, and Pb during mono-digestion of pig manure. The wider pH range and the chemical properties of the feedstock in co-digestion resulted in varied correlations between the metals availability and the digestion variables.
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| http://dx.doi.org/10.1016/j.biortech.2024.130818 | DOI Listing |
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