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  • batch and continuous flow studies of adsorptive removal of cr(vi) by adapted bacterial consortia immobilized in alginate beads

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 620
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -

    the adsorptive removal of cr(vi) by alginate beads containing cr(vi)-adapted acinetobacter junii, escherichia coli and bacillus subtilis in batch and continuous packed bed column reactors was investigated. under optimized conditions (ph 3.0; contact time, 180 min; 30 °c; initial cr(vi) concentration of 100 mg/l), 65.86 mg/g adsorption capacity was recorded in the batch study. when an adsorbent dosage of 1 g/l, a flow rate of 5 ml/min, a bed height of 20 cm, an initial cr(vi) concentration of 300 mg/l was employed, a capacity of 657 mg/g was noted for the continuous column assay. the batch sorption data followed the langmuir isotherm and pseudo second order kinetics. five sorption/desorption cycles yielded 100%, 99.63%, 95.31%, 80.7% and 74.22% regeneration, respectively. cr(vi) adsorption studies using spiked ground water, freshwater and domestic wastewater in a packed bed reactor demonstrated cr(vi) removals of 64.8%, 55.08%, 56.86% respectively. cr(vi) sorption on immobilized bacteria was confirmed with fourier-transform infrared and energy dispersive x-ray spectroscopy.

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