Effect of carrier gas during pyrolysis on the persistence and bioavailability of polycyclic aromatic hydrocarbons in biochar-amended soil
2022
Godlewska, Paulina | Oleszczuk, Patryk
In this study the persistence (based on extractable, Cₜₒₜ) and bioavailability (based on freely dissolved content, Cfᵣₑₑ) of polycyclic aromatic hydrocarbons (PAHs) in biochar-amended soil was investigated. Biochar produced at 500 or 700 °C from sewage sludge (BC) or sewage sludge and willow (W) mixture (BCW) in an atmosphere of nitrogen (N₂) or carbon dioxide (CO₂) was evaluated. The biochars were applied to the real soil (podzolic loamy sand) at a dose of 2% (w/w). The content of Cₜₒₜ and Cfᵣₑₑ PAHs was monitored for 180 days. The biochar production conditions determined the Cₜₒₜ and Cfᵣₑₑ PAHs in the soil. A change of carrier gas from N₂ to CO₂ caused an increase in Cₜₒₜ PAH losses in the soil from 19 to 75% for the biochar produced from SL and from 49 to 206% for the co-pyrolyzed biochar. As regards Cfᵣₑₑ PAHs, the change from N₂ to CO₂ increased the losses of Cfᵣₑₑ PAHs only for the biochar derived from SL at a temperature of 500 °C (by 21%). In the soil with the other biochars (produced at 700 °C from SL as well as at 500 and 700 °C from SL/W), the Cfᵣₑₑ increased from 17 to 26% compared to the same biochars produced in an atmosphere of N₂.
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