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Strontium Removal by Montmorillonite - Pseudomonas fluorescens System

Abstract

The present study was conducted to determine the abilities of Pseudomonas fluorescens cells, montmorinment and their composites to accumulate strontium from a liquid medium, and elucidate the role of microbes on the mobility of strontium. Firstly, strontium (under 1000 ppm) did not have effect on the metabolism of P.fluorescens, according to the results of growth curve and FTIR. Various P. fluorescensmontmorinment system were exposed to solution of 100 ppm Sr2+ in a liquid medium to differentiate its removal efficiency. Experimental results showed that the removal rate of strontium reached 93.62%, 93.38%, respectively, in the montmorillonite-P.fluorescens contact/ non-contact system. And the removing process could be divided into slowly removal phase (0-80 h) and rapidly removal phase (80-120 h). The relative strontium removal capacities by actual soil, in decreasing order, were actual soil>P.fluorescens>sterilized soil - P.fluorescens system>sterilized soil. Results of strontium removal by the components of system showed that EPS and dead cells played the major role in removing strontium in the montmorillonite - P.fluorescens system. These results suggest that P. fluorescens play an important role in removing strontium by the montmorillonite - P.fluorescens system.

Yulian Zhao, Qunwei Dai, Faqin Dong, Linbao Han, and Wang Yan

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