Role of different microorganisms in remediating PAH-contaminated soils treated with compost or fungi
| Autor: | Anna Alfani, Alessandro Bellino, Enrica Picariello, Flavia De Nicola, Daniela Baldantoni, Raffaella Morelli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Fungal consortium
Environmental Engineering Microorganism 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law engineering.material complex mixtures 01 natural sciences Soil chemistry.chemical_compound Bioremediation Settore BIO/07 - ECOLOGIA Soil Pollutants Anthracene Benzo[a]pyrene Biowaste compost PLFA Random forest Polycyclic Aromatic Hydrocarbons Microbial biodegradation Waste Management and Disposal Soil Microbiology 0105 earth and related environmental sciences Compost Composting Fungi General Medicine 020801 environmental engineering Biodegradation Environmental Benzo(a)pyrene chemistry Environmental chemistry Soil water engineering Pyrene |
| Popis: | Microbial degradation is the main responsible for polycyclic aromatic hydrocarbons (PAHs) removal from contaminated soils, and the understanding of this process is pivotal to define effective bioremediation approaches. To evaluate the contribution of several microbial groups in soil anthracene and benzo[a]pyrene degradation, the analysis of phospholipid fatty acid (PLFA) profiles and machine learning techniques were employed. To this end, PLFAs and PAH concentrations were analysed, along 274 days of incubation in mesocosms, in soils artificially contaminated with anthracene and benzo[a]pyrene, subjected to different treatments: untreated soil and soils treated with biowaste compost or fungal consortium. Random forest models, figuring anthracene or benzo[a]pyrene concentrations as dependent variables and PLFAs as predictors, were then built to evaluate the contribution of each variable in PAH degradation. PLFA profiles varied substantially among soil treatments and along time, with the increase of Actinomycetes in soils added with fungi and other Gram+ bacteria in compost amended soils. The former, together with fungi, are primarily responsible for anthracene and benzo[a]pyrene degradation in both treated soils, a process in which also metanotrophs and other Gram+ and Gram- bacteria participate. In untreated soil, the cooperation of a multitude of different microorganisms was, instead, responsible for PAH removal, a process with lower efficiency in respect to treated soils. |
| Databáze: | OpenAIRE |
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