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The impact of different extraction conditions on the concentration and properties of dissolved organic carbon in biochars derived from sewage sludge and digestates
 
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1
Faculty of Environmental Engineering, Lublin University of Technology
 
2
Faculty of Chemistry, Maria Curie-Sklodowska University
 
These authors had equal contribution to this work
 
 
Publication date: 2024-07-08
 
 
Corresponding author
Justyna Kujawska   

Faculty of Environmental Engineering, Lublin University of Technology
 
 
J. Ecol. Eng. 2024; 25(9)
 
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ABSTRACT
This study aimed to determine the quantity and quality of dissolved organic carbon (DOC) released from sewage sludge-derived biochar and digestion-derived biochar under different extraction conditions (deionised water, hot water, 0.1 mol/L NaOH) using TOC analyser, UV-vis spectroscopy. Biochars were produced through the pyrolysis process at temperatures of 400, 500, 600, and 800°C. The objective of this article was to examine the influence of diverse extraction solutions on the amount of dissolved organic carbon (BDOC) released from biochars and to delineate alterations in the composition and characteristics of DOC contingent on the extraction parameters. The findings demonstrated that elevated pyrolysis temperatures resulted in a notable reduction in DOC concentration, with fractions extracted using NaOH exhibiting the highest DOC concentrations. SUVA254 analysis and the E2/E3 ratio indicated that biochars produced at higher temperatures contained a greater proportion of aromatic and hydrophobic substances. These results indicate that pyrolysis temperature, feedstock type and extraction conditions are of significant importance for the properties of DOC in biochar. This has important implications for their potential applications in soil management and carbon sequestration strategies.
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