Journal
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
Volume 12, Issue 4, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-018-1073-4
Keywords
Factorial design analysis; Sulfate reducing bacteria; Multi-metal solution; Heavy metal removal; Anaerobic rotating biological contactor reactor; High metal loading
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This study was aimed at investigating the performance of anaerobic rotating biological contactor reactor treating synthetic wastewater containing a mixture of heavy metals under sulfate reducing condition. Statistically valid factorial design of experiments was carried out to understand the dynamics of metal removal using this bioreactor system. Copper removal was maximum (> 98%), followed by other heavy metals at their respective low inlet concentrations. Metal loading rates less than 3.7 mg/La (TM) h in case of Cu(II); less than 1.69 mg/La (TM) h for Ni(II), Pb(II), Zn(II), Fe(III) and Cd(II) are favorable to the performance of the An-RBC reactor. Removal efficiency of the heavy metals from mixture depended on the metal species and their inlet loading concentrations. Analysis of metal precipitates formed in the sulfidogenic bioreactor by field emission scanning electron microscopy along with energy dispersive X-ray spectroscopy (FESEM-EDX) confirmed metal sulfide precipitation by SRB. All these results clearly revealed that the attached growth biofilm bioreactor is well suited for heavy metal removal from complex mixture. (c) Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018
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