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Abstract
The present study aimed to evaluate the effectiveness of Moringa oleifera seeds which exhibit a high economic importance in the treatment of synthetic as well as industrial waters from the high toxic heavy metal contents as (Mn, Cu and Cr). This study is considered as a new trend for polluted water treatment in Egypt where most of the treatment processes are carried out by methods using chemical subtances which show a potential hazardous effects to human health. It was observed that Mo seeds are able to remove heavy metals by high efficiency, where a percentage of removal 88.93% for Cu, 91.43% for Mn and 72.72% for Cr were recorded by using direct method with defatted seeds at various concentrations and pH values. A model sample from tannery sources with high Cr content was used to evaluate the efficiency of Mo seeds in Cr removal, the percentage of removal was calculated as 84.76% by direct method which improved the values obtained for Cr removal using a synthetic water. Also, the ability of nematode endoparasites to bioaccumulate heavy metals from the electric catfish Malapterurus electricus (order: Siluriformes) was studied. It was observed that these parasites are able to bioaccumulate the heavy metals (Fe, Zn, Pb Cd, Mn and Cu) higher than those in the edible muscles of the host. Also, the antibacterial effect of Mo seeds was tested in a water sample collected from the River Nile. It was observed that, all of the prepared concentrations of Mo seed powder were effective in the reduction of three tested bacterial counts (Total Bacterial Count, Total Coliform Bacterial Count and Fecal coliform Bacterial Count) but with various percentages of removal