Characterization of chars produced in the co-pyrolysis of different wastes: Decontamination study

Abstract

Summary: The present work is devoted to the study of chars obtained in the co-pyrolysis of plastics, biomass and tyres wastes. The chars were extracted with several organic solvents in order to assess the more efficient in reducing the organic load of the chars and, therefore, their toxicity. The ability of each selected extractant to remove toxic pollutants was evaluated by comparing the extracts yield and thoroughly characterizing the different crude extracts obtained by combining chemical analysis and toxicity bioassays. Also, the mineral composition of the treated and non treated chars was assessed. The results will allow to conclude which solvent should be used in the decontamination of the pyrolysis chars.

Fates of Chemical Elements in Biomass during Its Pyrolysis

“…It cannot be exempt from these problems since biomass contains elements other than C, H, and O which may be potentially hazardous . These elements, such as P, S, Cl, and alkali (alkaline earth) metals, are diversely distributed in the products of biomass pyrolysis processes and may (I) cause serious harm to human health and the ecosystem; (II) result in severe operation problems such as agglomeration, slagging, deposition, and heated side corrosion during the pyrolysis process; and (III) act as a catalyst in the pyrolysis process. , Most of the previous research is focused on the fate of these elements during the thermal conversion of coal and waste synthetic polymers such as plastics and tires. Previous research indicated that the release of these elements depends mainly on the volatilization temperature .…”

Bio-oils from biomass slow pyrolysis: A chemical and toxicological screening

“…A few studies provide information about the hazards posed by bio-oils obtained from biomass pyrolysis [8][9][10][11][12][13]. Data on the hazards of biomass co-pyrolysis products are reported by Bernardo and coworkers [14][15][16]. Material Safety Data Sheets have been also proposed for some bio-oils [8,17,18].…”

From Waste Metallized Film Capacitors to Valuable Materials: Hexagonal Flake-Like Micron Zinc Powder, Copper–Iron Electrodes, and an Energy Resource

“…The decomposition efficiency could not reach 100%, which was attributed to the idea that some of the organics will be transformed into residual carbon under oxygen-free conditions. 30,31 Therefore, the temperature of 500 °C and holding time for 30 min could be regarded as the optimal pyrolysis parameter for organics in this work.…”