title: Biodegradation of Various Aromatic Compounds by Enriched Bacterial Cultures: Part A-Monocyclic and Polycyclic Aromatic Hydrocarbons.
abstract: Present study focused on the screening of bacterial consortium for biodegradation of monocyclic aromatic hydrocarbon (MAH) and polycyclic aromatic hydrocarbons (PAHs). Target compounds in the present study were naphthalene, acenaphthene, phenanthrene (PAHs), and benzene (MAH). Microbial consortia enriched with the above target compounds were used in screening experiments. Naphthalene-enriched consortium was found to be the most efficient consortium, based on its substrate degradation rate and its ability to degrade other aromatic pollutants with significantly high efficiency. Substrate degradation rate with naphthalene-enriched culture followed the order benzene > naphthalene > acenaphthene > phenanthrene. Chryseobacterium and Rhodobacter were discerned as the predominant species in naphthalene-enriched culture. They are closely associated to the type strain Chryseobacterium arthrosphaerae and Rhodobacter maris, respectively. Single substrate biodegradation studies with naphthalene (PAH) and benzene (MAH) were carried out using naphthalene-enriched microbial consortium (NAPH). Phenol and 2-hydroxybenzaldehyde were identified as the predominant intermediates during benzene and naphthalene degradation, respectively. Biodegradation of toluene, ethyl benzene, xylene, phenol, and indole by NAPH was also investigated. Monod inhibition model was able to simulate biodegradation kinetics for benzene, whereas multiple substrate biodegradation model was able to simulate biodegradation kinetics for naphthalene.
authors.affiliation: Environmental and Water Resources Engineering Division, Department of Civil Engineering, IIT Madras, Chennai, 600 036, India.
authors.forename: Akashdeep Singh
authors.initials: AS
authors.lastname: Oberoi
authors.forename: Ligy
authors.initials: L
authors.lastname: Philip
authors.forename: S Murty
authors.initials: SM
authors.lastname: Bhallamudi
mesh_terms: D000064:Acclimatization; D000332:Aerobiosis; D001673:Biodegradation, Environmental; D049109:Cell Proliferation / Q000187:drug effects; D045247:Chryseobacterium / Q000166:cytology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D046508:Culture Techniques; D007700:Kinetics; D008954:Models, Biological; D010802:Phylogeny; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism* / Q000494:pharmacology; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D016992:Rhodobacter / Q000166:cytology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D017423:Sequence Analysis, RNA; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical