title: Simultaneous Cr(VI) reduction and phenol degradation using Stenotrophomonas sp. isolated from tannery effluent contaminated soil.
abstract: This study presents simultaneous hexavalent chromium (Cr(VI)) reduction and phenol degradation using Stenotrophomonas sp., isolated from tannery effluent contaminated soil. Phenol was used as the sole carbon and energy source for Cr(VI) reduction. The optimization of different operating parameters was done using Placket-Burman design (PBD) and Box-Behnken design (BBD). The significant operating variables identified by PBD were initial Cr(VI) and phenol concentration, pH, temperature, and reaction time. These variables were optimized by a three-level BBD and the optimum initial Cr(VI) concentration, initial phenol concentration, pH, temperature, and reaction time obtained were 16.59 mg/l, 200.05 mg/l, 7.38, 31.96 °C and 4.07 days, respectively. Under the optimum conditions, 81.27 % Cr(VI) reduction and 100 % phenol degradation were observed experimentally. The results concluded that the Stenotrophomonas sp. could be used to decontaminate the effluents containing Cr(VI) and phenol effectively.
authors.affiliation: Department of Chemical Engineering, Alagappa College of Technology Campus, Anna University Chennai, Chennai, 600 025, India.
authors.forename: Dharmaraj
authors.initials: D
authors.lastname: Gunasundari
authors.forename: Karuppan
authors.initials: K
authors.lastname: Muthukumar
mesh_terms: D001673:Biodegradation, Environmental; D002857:Chromium / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis; D010636:Phenols / Q000737:chemistry / Q000378:metabolism*; D010802:Phylogeny; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000737:chemistry*; D020588:Stenotrophomonas / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D013633:Tanning; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D007220:Industrial Waste; D010636:Phenols; D012989:Soil Pollutants; D002857:Chromium; C074702:chromium hexavalent ion