Department of Chemical Engineering

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Author: search.filters.author.Majumder, SubhajitSubject: search.filters.subject.Biofiltration

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    Biofiltration: Essentials, Research and Applications
    (Wiley, 2012-03-26) Gupta, Suresh; Raghuvanshi, Smita; Majumder, Subhajit
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    Biofilter column for removal of divalent copper from aqueous solutions: Performance evaluation and kinetic modeling
    (INFOFNA, 2015) Gupta, Suresh; Raghuvanshi, Smita; Majumder, Subhajit
    In recent years, the biofiltration technique has gained significant importance for the removal of toxic organic compounds. However, very limited studies on biofiltration were carried out for the removal of divalent copper [Cu(II)] from aqueous solution using indigenous packing material. There are no reports in the literature that deal with the performance evaluation and kinetic modeling of the biofilter column for the removal of Cu(II). In the present study, a lab- scale biofilter column was fabricated and packed with a mixture of compost and coal as a packing material. The seeding of the column was done using an indigenous bacterial strain Acinetobacter guillouiae. The removal of divalent copper [Cu(II)] was investigated in this column for a period of 55 days. The maximum removal efficiency of 97.5% was achieved during phase II for Cu(II) inlet concentration of 20 mg L−1. During shock loading, maximum removal efficiency obtained was 87% for initial Cu(II) concentration 28.5–30 mg L−1. The Michaelis–Menten kinetic constants obtained were 0.2 mg L−1 min−1 and 13.03 mg L−1. It was found that the Ottengraf model with zero-order diffusion-limitation fits the experimental data quite well for phase II, III and V.
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    Application of a hybrid biofilter column for the removal of Cr(VI) from aqueous solution using an indigenous bacterial strain Pseudomonas taiwanensis
    (Taylor & Francis, 2016-02-01) Gupta, Suresh; Raghuvanshi, Smita; Majumder, Subhajit
    In the present study, a laboratory-scale biofilter column was designed and fabricated. It was packed with a mixture of coal and compost as a packing medium. The column was enriched with an indigenous bacterial strain Pseudomonas taiwanensis isolated from aerobic mixed culture of Sewage Treatment Plant, BITS-Pilani, Pilani campus. The removal of hexavalent chromium [Cr(VI)] from aqueous solution was investigated in the biofilter column. The entire biofiltration operation was divided into five phases (I to V) for a period of 63 days. Biofilter column was subjected to shock loading conditions for 20 days immediately after 63 days of operation. The maximum removal efficiency of 89.4% was obtained during phase V for Cr(VI) inlet concentration of 40 mg L−1. During shock loading, maximum removal efficiency was obtained as 90% for 48.5–50 mg L−1 of initial Cr(VI) concentration. Kinetic parameters of biofiltration process for Cr(VI) removal were also determined by fitting Michaelis-Menten kinetic model with experimental data. The Michaelis-Menten kinetic constants were obtained as 0.258 mg L−1 min−1 and 26.83 mg L−1. It was found that Ottengraf-Van den Oever model with zero-order diffusion limitation fit the experimental data quite well for phases III, IV, and V with coefficient of determination (R2) values .97, .99, and .984, respectively. A possible method for safe disposal of packing medium was also presented in this study.