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In this research, several strains of Pseudomonas fragi and<br>Pseudomonas stutzeri were isolated from the Qatar's marine water and<br>identified through MALDI-TOF MS. It was found that the commonly<br>found Pseudomonas bacteria can biodegrade antiscalants and utilize<br>them as a source of energy and carbon. However, the biodegradation<br>rates were different for different antiscalants studied. Furthermore, all<br>the tested strains were found to be capable of precipitating calcium<br>sulfate at non-crystallizing conditions, since the precipitation was not<br>observed in controls (RO membranes not inoculated with bacteria).<br>Therefore, it can be concluded that microorganisms pose two threats in<br>RO desalination systems i.e. (i) biodegradation of antiscalants reducing<br>their efficiency to control scaling; and (ii) induction of calcium sulfate<br>precipitation on RO membranes. As a result, the presence of microorganisms will not only cause biofouling but also enhance mineral<br>scaling on the RO membranes. Therefore, it is important to consider the<br>foulant-foulant interactions during development of fouling control<br>strategies. Further research is being conducted in investigating these<br>interactions in detail and develop membrane materials capable of<br>tackling both biofouling and scaling, simultaneously
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