Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 218, Issue -, Pages 486-496Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.03.020
Keywords
Immobilized sulfate reducing bacteria; Sodium alginate beads; Sulfide precipitation; Heavy metals; Packed column reactor
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Heavy metal removal was evaluated using sodium alginate immobilized sulfate reducing bacteria (SRB) under batch and continuous mode. Under batch conditions, more than 95% metal removal was achieved due to formation of insoluble metal sulfides exterior to the bead surface. Best heavy metal removal results were obtained at 48 h hydraulic retention time (HRT). Metal loading rate values upto 2.20 mg/L.h for Fe(III), Zn(II), Cd(ll), Pb(II) and Ni(II) and upto 4.29 mg/L.h for Cu(II) were proved to be favorable for their removal using the continuous downflow column reactor packed with the immobilized SRB beads. Continuous metal removal from a mixture of the heavy metals showed that Cu(II) removal was maximum (99%), followed by Zn(II) (95.8%) and other metals at their respective low inlet concentrations. However, the removal values were reduced at a high inlet concentration of these metals, which matched well with low COD and sulfate reduction values. (C) 2018 Elsevier Ltd. All rights reserved.
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