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Phytoremediation of a Highly Creosote- Contaminated Soil by Means of Salix Viminalis

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Phytoremediation of a Highly Creosote- Contaminated Soil by Means of Salix Viminalis International Poplar Commission Phytoremediation of a highly creosote- contaminated soil by means of Salix viminalis Karin Önneby1, Leticia Pizzul1 and Ulf Granhall1 Mauritz Ramstedt 1Department of Microbiology, SLU, P.O. Box 7025, 75007 Uppsala, SWEDEN Email:E-mail: mauritz.ramstedt@m [email protected] Objective To study the effect of willow (Salix viminalis) on the degradation of polycyclic aromatic hydrocarbons (PAHs) in a highly creosote-contaminated soil. Results 1600 The presence of S. viminalis enhanced 1400 Initial degradation of all the studied PAHs (Fig. 1). 1200 The highest dissipations were observed for Without plant 1000 With plant fluoranthene (79%) and pyrene (77%). For 800 those compounds, some degradation also 600 occurred in pots without plants, 35 and 19% 400 Concentration (mg/kg dw) Concentration respectively. Degradation of anthracene 200 (67%) and benzo[a]pyrene (43%) was found 0 Anthracene Fluoranthene Pyrene Benzo[a]pyrene only in pots with S. viminalis. Fig. 1. PAH concentrations in the creosote-contaminated soil, initially and after 10 weeks of treatment with or without plant. 4000000 The higher number of bacteria in the 3000000 treatments with plants, compared to the initial soil and the soil without plants (Fig. 2) 2000000 indicates an increase in microbial activity. CFU (dw) /g soil 1000000 This activity, and possibly a higher release of biosurfactants, could explain the enhanced 0 degradation obtained with plants. Initial Without plant With plant Fig. 2. Bacterial number (CFU/g dry soil) in the creosote- contaminated soil, initially and after 10 weeks of treatment with or without plant. Conclusions and future perspectives The use of S. viminalis in phytoremediation is quite promising. The disappearance of benzo[a]pyrene is of particular interest due to its recalcitrance. Our future plans are to investigate the mechanisms behind the disappearance of PAHs and to evaluate other willow clones for their potential to reduce organic pollutants in soil. Background Materials and methods Phytoremediation is the use of plants to clean up Salix viminalis (clone 78 183) was grown in pots contaminated sites and is based on biological containing a highly creosote-contaminated soil from processes involving the capability of plants and a former wood impregnation site belonging to the related microbial populations to accumulate, break Swedish Railway Administration, in Krylbo. Pots down or to reduce the mobility of contaminants. without plants were also included. The experiment Creosote, a common wood preservative, consists of was carried out for 10 weeks in a greenhouse. up to 85% different PAHs. PAHs are organic Anthracene, fluoranthene, pyrene and benzo[a]pyrene contaminants of highest concern because of their were analysed by GC-MS. The microbial number toxicity, and mutagenic and carcinogenic was obtained by viable count (CFU g soil-1). properties. [email protected] Environmental Applications of Poplar and Willow Working Party 18-20 May 2006, Northern Ireland International Poplar Commission Environmental Applications of Poplar and Willow Working Party 18-20 May 2006, Northern Ireland .
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