Polycyclic aromatic hydrocarbons degradation and microbial community shifts during co-composting of creosote-treated wood

Journal of Hazardous Materials
Stefano CovinoT Cajthaml

Abstract

The feasibility of decontaminating creosote-treated wood (CTW) by co-composting with agricultural wastes was investigated using two bulking agents, grass cuttings (GC) and broiler litter (BL), each employed at a 1:1 ratio with the matrix. The initial concentration of total polycyclic aromatic hydrocarbons (PAHs) in CTW (26,500 mg kg(-1)) was reduced to 3 and 19% after 240 d in GC and BL compost, respectively. PAH degradation exceeded the predicted bioaccesible threshold, estimated through sequential supercritical CO2 extraction, together with significant detoxification, assessed by contact tests using Vibrio fisheri and Hordeum vulgare. GC composting was characterized by high microbial biomass growth in the early phases, as suggested by phospholipid fatty acid analyses. Based on the 454-pyrosequencing results, fungi (mostly Saccharomycetales) constituted an important portion of the microbial community, and bacteria were characterized by rapid shifts (from Firmicutes (Bacilli) and Actinobacteria to Proteobacteria). However, during BL composting, larger amounts of prokaryotic and eukaryotic PLFA markers were observed during the cooling and maturation phases, which were dominated by Proteobacteria and fungi belonging to the Ascomy...Continue Reading

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Citations

Feb 28, 2016·Applied Microbiology and Biotechnology·Matthias Kästner, Anja Miltner
Oct 12, 2018·Environmental Science and Pollution Research International·Li-Juan FengJia-Li Li
Nov 25, 2016·Environmental Toxicology and Chemistry·Austin K BaldwinMatthew Magruder
Aug 5, 2016·Environmental Science and Pollution Research International·Patricia GodoyElisabet Aranda
Jul 10, 2018·Applied Microbiology and Biotechnology·Hao ZhouAnthony G Hay
Nov 20, 2020·The Science of the Total Environment·Huu-Tuan TranChi-Thanh Vu
Feb 16, 2021·Biodegradation·Rocío MedinaMaría T Del Panno

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