title: Bioremediation of polycyclic aromatic hydrocarbon (PAH) compounds: (acenaphthene and fluorene) in water using indigenous bacterial species isolated from the Diep and Plankenburg rivers, Western Cape, South Africa.
abstract: This study was conducted to investigate the occurrence of PAH degrading microorganisms in two river systems in the Western Cape, South Africa and their ability to degrade two PAH compounds: acenaphthene and fluorene. A total of 19 bacterial isolates were obtained from the Diep and Plankenburg rivers among which four were identified as acenaphthene and fluorene degrading isolates. In simulated batch scale experiments, the optimum temperature for efficient degradation of both compounds was determined in a shaking incubator after 14 days, testing at 25°C, 30°C, 35°C, 37°C, 38°C, 40°C and 45°C followed by experiments in a Stirred Tank Bioreactor using optimum temperature profiles from the batch experiment results. All experiments were run without the addition of supplements, bulking agents, biosurfactants or any other form of biostimulants. Results showed that Raoultella ornithinolytica, Serratia marcescens, Bacillus megaterium and Aeromonas hydrophila efficiently degraded both compounds at 37°C, 37°C, 30°C and 35°C respectively. The degradation of fluorene was more efficient and rapid compared to that of acenaphthene and degradation at Stirred Tank Bioreactor scale was more efficient for all treatments. Raoultella ornithinolytica, Serratia marcescens, Bacillus megaterium and Aeromonas hydrophila degraded a mean total of 98.60%, 95.70%, 90.20% and 99.90% acenaphthene, respectively and 99.90%, 97.90%, 98.40% and 99.50% fluorene, respectively. The PAH degrading microorganisms isolated during this study significantly reduced the concentrations of acenaphthene and fluorene and may be used on a larger, commercial scale to bioremediate PAH contaminated river systems.
authors.affiliation: Cape Peninsula University of Technology, Department of Environmental and Occupational Studies, Cape Town, South Africa. Electronic address: seunalegbeleye@gmail.com.
authors.forename: Oluwadara Oluwaseun
authors.initials: OO
authors.lastname: Alegbeleye
authors.affiliation: Cape Peninsula University of Technology, Faculty of Applied Sciences, Extended Curriculum Programmes, Cape Town, South Africa.
authors.forename: Beatrice Olutoyin
authors.initials: BO
authors.lastname: Opeolu
authors.affiliation: Cape Peninsula University of Technology, Department of Biotechnology and Consumer Science, Cape Town, South Africa.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Jackson
mesh_terms: D000073:Acenaphthenes / Q000378:metabolism*; D001419:Bacteria / Q000145:classification / Q000302:isolation & purification* / Q000378:metabolism*; D001711:Biotransformation; D005449:Fluorenes / Q000378:metabolism*; D045483:Rivers / Q000382:microbiology*; D013019:South Africa; D013696:Temperature
chemical_list: D000073:Acenaphthenes; D005449:Fluorenes; C041509:fluorene; C042552:acenaphthene
keywords: Bioreactor; Bioremediation; PAH degrading microorganisms; Polycyclic aromatic hydrocarbons (PAHs)