Biological treatment of transformer oil using commercial mixtures of microorganisms |
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| Authors: | Elzbieta Sobiecka Krystyna Cedzynska Conrad Bielski Blanca Antizar-Ladislao |
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| Institution: | 1. Technical University of Lodz, Institute of General Food Chemistry, ul. Stefanowskiego 4/10, 94-043 Lodz, Poland;2. EC DG JRC IES, Spatial Data Infrastructures Unit, via E Fermi 2749, TP 262, 21027 Ispra (VA), Italy;3. University of Edinburgh, School of Engineering and Electronics (Environmental Engineering), The King''s Buildings, Mayfield Road, Edinburgh EH9 3JL, United Kingdom;1. Institute of Microbiology, Academy of Sciences of the Czech Republic v.v.i., Vídeňská 1083, CZ-142 20, Prague 4, Czechia;2. Department for Innovation in Biological, Agro-food and Forest Systems (DIBAF), University of Tuscia, Via S. Camillo De Lellis, 01100, Viterbo, Italy;3. Institute for Environmental Studies, Faculty of Science, Charles University in Prague, Benátská 2, CZ-128 01, Prague 2, Czechia;4. Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via del Giochetto snc, 06122, Perugia, Italy;1. Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China;2. State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Weigang, Nanjing, China |
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| Abstract: | The biodegradation of six PCB congeners (IUPAC nos. 28, 52, 101, 138, 153, and 168) present in transformer oil using different commercial mixtures of microorganisms (Sybron 1000, Biozyn 301, Biozyn 300, DBC 5, ChZR, NS 20-10, NS 20-20, and NS 20) under anoxic, oxic, or anoxic/oxic treatments was investigated at laboratory scale. Overall, PCB congener biodegradation was observed in all treatments in the ranges of 0–99%, 2–97% and 40–94% under anoxic, oxic, or anoxic/oxic treatments, respectively. The highest biodegradation of total PCB congeners occurred using Sybron under oxic and anoxic conditions (76.0% and 91.3% reduction, respectively; initial PCB concentration, 1417.1 mg l?1). Also, the highest biodegradation extent of the PCB congeners occurred when the commercially available mixture of microorganisms, Sybron, was used (84.7% reduction) under combined anoxic/oxic conditions. Demonstration that biodegradation of most of the individual PCB congeners was achieved by the commercial mixtures of microorganisms in this study suggests that PCB-impacted environments can sustain populations of these PCB-metabolizing organisms. This is particularly relevant for the development of biostimulation or bioaugmentation strategies for the bioremediation of PCB-contaminated wastes. |
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