An integrated approach to remove Cr(VI) using immobilized Chlorella minutissima grown in nutrient rich sewage wastewater

► Nutrient removal coupled with algal biomass production. ► Cr biosorption using wastewater grown immobilized C. minutissima. ► Recovery of Cr from metal from loaded immobilized C. minutissima. The potential of an integrated system for sewage wastewater treatment and biosorption of chromium(VI) was...

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Bibliographic Details
Published in:Bioresource technology 2012-01, Vol.104, p.257-265
Main Authors: Singh, Shailendra Kumar, Bansal, Ajay, Jha, M.K., Dey, Apurba
Format: Article
Language:English
Subjects:
Bioreactors - microbiology
Biosorption
Cells, Immobilized
Chlorella
Chlorella - cytology
Chlorella - metabolism
Chlorella minutissima
Chromium
Chromium - isolation & purification
Chromium - metabolism
Desorption
Drying
Equipment Design
Equipment Failure Analysis
Immobilization
Phycoremediation
Sewage
Sewage - microbiology
Species Specificity
Systems Integration
Uptakes
Waste water
Water Pollutants, Chemical - isolation & purification
Water Pollutants, Chemical - metabolism
Water Purification - methods
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Summary:► Nutrient removal coupled with algal biomass production. ► Cr biosorption using wastewater grown immobilized C. minutissima. ► Recovery of Cr from metal from loaded immobilized C. minutissima. The potential of an integrated system for sewage wastewater treatment and biosorption of chromium(VI) was evaluated using immobilized Chlorella minutissima cells. Immobilized algal cells were grown in sewage wastewater in designed photobioreactor for 48h and then subjected to removal of Cr(VI) from synthetic wastewater. The effect of pH, Cr(VI) concentration, biosorbent dose on Cr(VI) removal was investigated. C. minutissima showed a higher NH4+-N and PO43--P removal efficiency (above 99% removal) than the NO32--N (58% removal) in 48h. Biosorption of Cr(VI) was found to be highly dependent on solution pH, biosorbent dose and initial Cr(VI) concentration. Maximum Cr(VI) uptake 57.33mgCr(VI)/g dry biosorbent/L of solution was observed at pH2 with 20% (w/v) biosorbent. Further more than 90% of total Cr adsorbed could be recovered using 0.5M NaOH as desorption medium.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2011.11.044