In this work, the green microalgae Scenedesmus obliquus was tested for his Fe3+ removal ability in his living state.To avoid poisoning by heavy metals, the green microalgae Scenedesmus obliquus used in the form of paste obtained after incubation, for seven days in the treated wastewater, and centrifugation.The findings showed that this method achieved total removal of Fe3+in less time, with a lower cost of materials, and with less complexity than the method commonly used which uses absorption.This method avoids four disadvantages of the current method, which 1) need a long time to achieve total removal of heavy metals, 2) is a slower process which needs greater time and cost, 3) cannot be used for any heavy metal that requires an acidic environment in order to avoid precipitation, and 4) slows the growth of algae and causes mortality of algae due to the acidic environment and prolonged exposure of algae to toxic heavy metal.The maximum Fe3+ removal was estimated to use 16g/l of living algal cells to remove 25g/l of Fe3+ with pH=3, T°=30°C and 80tr/min during 20min.
<p>:<strong> </strong>The present work compares the biosorption capacity of Fe<sup>3+</sup> by the living biomass presented in our previous study with dead biomass prepared from the same microalgae after deactivating the cells using temperature (drying). This technique (dry biomass) is the most frequently used in biological processes based on adsorption by microalgae. The influence of different parameters on the biosorption capacity of the two biomasses was studied. The highest efficiency of metal removal was recorded by a live microalgae <em>Scenedesmus obliquus,</em> with a removal value of 100% within 20 minutes versus to 43% for dried microalgae within 60 minutes. This work confirms the potential use of a live microalgae <em>Scenedesmus obliquus</em> as an efficient technique for removing ions from wastewater.</p>
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