Study on Adsorption of Strontium by Immobilized Deinococcus radiodurans Cell Bead Packed Column and Volume Reduction

Two different immobilized carrier,sodium alginate(SA)and polyvinyl alcohol(PVA)-sodium alginate(SA) immobilized Deinococcus radiodurans beads were used to investigate the adsorption and elution for strontium as well as the volume reduction by ashing.Results showed that both SA beads containing 5% biomass and PVA-SA beads containing 10% biomass had good mechanical strength.The packed column of SA immobilized D.radiodurans beads had higher adsorption ratio and elution ratio than PVA-SA immobilized beads for strontium,with the maximum adsorption ratio about 98% and elution ratios above 90%.FTIR results indicated that the SA immobilized D.radiodurans beads had more binding groups for strontium adsorption than PVA-SA immobilized beads.The volume reduction results showed the SA immobilized D.radiodurans beads had greater weight reduction ratio than PVA-SA immobilized beads by ashing process,which could reach about 1 650 times.The results suggested that the SA immobilized D.radiodurans beads may be potential application for wastewater treatment.