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|Title:||Studies on removal of heavy metals from wastewater using biofiltration|
|Keywords:||Removal of heavy metals, Wastewater, Biofiltration|
|University:||Birla Institute of Technology and Science|
|Abstract:||The present work deals with the bioremediation and biofiltration experimental studies for the removal of chromium [Cr(VI)], copper [Cu(II)] and zinc [Zn(II)] from wastewater. This study includes isolation of three distinct bacterial strains Pseudomonas taiwanensis, Acinetobacter guillouiae and Klebsiella pneumoniae from activated sludge of the Sewage Treatment Plant, BITS-Pilani, Pilani, Rajasthan, India. These strains are utilized to treat Cr(VI), Cu(II) and Zn(II) contaminated aqueous solutions. The extensive batch studies are performed to see the effect of initial metal concentration, initial pH, MSM dosage, Nitrogen (N)-Phosphorus (P)-Potassium (K) composition in MSM, aerobic and facultative anaerobic conditions, temperature and inoculum volume on metal removal. The maximum values of specific growth rate of P. taiwanensis, A. guillouiae and K. pneumoniae are obtained as 0.262 h-1 for 150 mg L-1 of Cr(VI), 0.208 h-1 for 80 mg L-1 of Cu(II) and 0.043 h-1 for 80 mg L-1 of Zn(II), respectively. newlineVarious growth kinetic models such as Monod, Powell, Haldane, Luong and Edwards are tested with the experimentally obtained bioremediation data of three bacterial strains for Cr(VI), Cu(II) and Zn(II) removals. The rate kinetic approaches (zero-order and three-half-order) are applied to experimental data obtained from bioremediation study. newlineA novel consortium of three bacterial species (P. taiwanensis, A. guillouiae and K. pneumoniae) is developed and used to remove single and multiple metals from aqueous solutions. Metal uptake capacity of consortium is compared with the uptake capacity of the individual species for single and multiple metal ions. Efficacy of consortium is also tested for the simulated industrial effluents contaminated with multiple metals at different compositions. Consortium shows maximum removal efficiency and uptake capacity for the single as well as multiple metal removal. newlineThe continuous biofiltration studies are carried out for the removal of individual metals Cr(VI), Cu(II) and Zn(II) in an in-house|
|Appears in Departments:||Chemical Engineering|
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