Stabilization of sewage sludge by different biochars towards reducing freely dissolved polycyclic aromatic hydrocarbons (PAHs) content.
The objective of the study was to identify the effect of various biochars on the content of freely dissolved (Cfree) PAHs in sewage sludge. Apart from the evaluation of biochars obtained from various materials, the study also included the determination of the effects of biochar particle sizes and biochar production temperature on their ability to bind PAHs in sewage sludge. Increase in biochar dose caused a gradual reduction of Cfree PAHs content, but only up to the biochar dose of 5%. Depending on the kind of initial material from which the biochar was produced, the reduction of Cfree PAHs content in sewage sludge varied from 17.4% to 58.0%. Both the temperature and the particle size of biochar had an effect on PAH free concentration reduction. Biochars characterised by a low polarity index (O/C or (O+N)/C) reduced the level of Cfree PAHs better than biochars with a higher polarity index value.
Department of Environmental Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Square, 20-031 Lublin, Poland. Electronic address: patryk.oleszczuk@poczta.umcs.lublin.pl.
Patryk
P
Oleszczuk
Department of Environmental Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Square, 20-031 Lublin, Poland.
Anna
A
Zielińska
Department of Environmental Engineering, Norwegian Geotechnical Institute NGI, Oslo 16, Norway; Department of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden; Institute for Plant and Environmental Sciences, University of Life Sciences (UMB), 5003 Ås, Norway.
Gerard
G
Cornelissen
D002606:Charcoal / Q000737:chemistry*; D010316:Particle Size; D010944:Plants / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*
D011084:Polycyclic Aromatic Hydrocarbons; D012722:Sewage; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal
Availability; Biochar; PAHs; Sewage sludge