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Abstract
The aim of this study was to find biological methods with high efficiency for the treatment of wastewater and heavy metals polluted water. This was achieved by using polluted water associated fungi and detection of its ability to biosorb some heavy metals like Zinc (Zn), Copper (Co), Lead (Pb), Manganese (Mn), iron (Fe) and cobalt (Co) present in the polluted water samples. These fungi isolated from irrigation and drainage canals located near the industrial area of New Damietta. Mucor Racemosus was selected because it is the most common fungus and then the appropriate and optimum conditions to improve its effectiveness were provided. Fourty – five fungi were isolated and identified. Temperature, pH, Alkalinity, Ammonia, Chemical Oxygen Demand, Total Suspended Solids, Total Dissolved solids and Oil And Grease of The collected water samples were studied. The concentrations of heavy metals (Zn, Cu, Pb, Mn, Fe and Co) in the polluted water samples were determined. Heavy metals polluted water samples were treated by M. racemosus biosorbent because it is the most common fungus in the polluted water samples. Effect of initial metal ion concentration, biomass concentration, pH control and contact time were studied using dried (live) M. racemosus. M. racemosus was alkali treated with sodium hydroxide (NaOH) and this was an efficient method because the biosorption of heavy metals using M. racemosus was increased after its treatment with NaOH. Then alkali-treated M. racemosus was immobilized on Ca-alginate beads and this efficiently improved the capacity of M. racemosus to biosorb heavy metals present in the polluted water samples. Up to 80.55%, 81.11%, 96.15%, 83.83%, 96.81% and 96% of Zn, Cu, Pb, Mn, Fe and Co were removed at pH 4 respectively by alkali-treated immobilized M. racemosus. While at pH 5 up to 95.04%, 95.88%, 83.24%, 96.34%, 85.88% and 84.85% of Zn, Cu, Pb, Mn, Fe and Co were removed respectively by alkali-treated immobilized M. racemosus.