title: Characterization of a simple bacterial consortium for effective treatment of wastewaters with reactive dyes and Cr(VI).
abstract: A microbial consortia consisting of three bacteria isolated from tanning and textile wastewaters revealed high capacity to simultaneously bioaccumulate dye and Cr(VI). The identity of the bacteria were determined by 16S rRNA gene analysis to be closely related to Ochrobactrium sp., Salmonella enterica and Pseudomonas aeruginosa. Dependence of initial pH values and range of concentrations of the dye Reactive Black B (33.2-103.1 mg l(-1)) and Cr(VI) (19.9-127.6 mg l(-1)) were examined to find the effect of pH on the dye and Cr(VI) bioaccumulation. Optimal pH for growth of the consortia in media containing 35 mg l(-1) dye and 50 mg l(-1) Cr(VI) was determined to be around 8. The Cr(VI) bioaccumulation by the consortia was rapid in media containing molasses with or without reactive dye with a maximum Cr(VI) bioaccumulation yield ranging from 90% to 99% within a 2-4d period. A slightly lower yield for the dye bioaccumulation was measured with a maximum dye bioaccumulation of 80% at 59.3 mg l(-1) dye and 69.8 mg l(-1) Cr(VI). The highest specific Cr uptake value was obtained as 76.7 mg g(-1) at 117.1 mg l(-1) Cr(VI) and 50.8 mg l(-1) dye concentration. This ability to bioaccumulate dye and Cr(VI) was more efficient than the enriched sludge from which they were isolated.
authors.affiliation: Faculty of Science, Biotechnology Division, Ankara University, Department of Biology, 06100 Beşevler, Ankara, Turkey.
authors.forename: Nur Koçberber
authors.initials: NK
authors.lastname: Kiliç
authors.forename: Jeppe Lund
authors.initials: JL
authors.lastname: Nielsen
authors.forename: Meral
authors.initials: M
authors.lastname: Yüce
authors.forename: Gönül
authors.initials: G
authors.lastname: Dönmez
mesh_terms: D001673:Biodegradation, Environmental; D002857:Chromium / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D009282:Naphthalenesulfonates / Q000378:metabolism*; D042041:Ochrobactrum / Q000302:isolation & purification*; D011550:Pseudomonas aeruginosa / Q000302:isolation & purification*; D019779:Salmonella enterica / Q000302:isolation & purification*; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D009282:Naphthalenesulfonates; D012722:Sewage; D002857:Chromium; C063421:Remazol black B