الفهرس 
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Abstract
The aim of the present work, is to study the ecological features, pollution status and comparative studies between different remediation processes of heavy metals from wastewater in Manzala Lake drains to improve water quality for reuse in irrigation, so our objectives were: Throw light on some pollutants in Manzala Lake drains, Nile Delta, Egypt, inventory of aquatic plants inhabiting the water and banks of the drains, Nile Delta, collect samples of water and sediment from selected sites to conduct the physical and chemical analysis, estimation of heavy metals in plants, water and sediment, determination the phyto-accumulation efficiency of some aquatic plant species growing in drains of Manzala Lake and removal of different pollutants by Fenton oxidation (Chemical remediation). Floristically, the total number of the recorded flowering plant species in the current research is 50 (36 perennials, one biennials and 13 annuals), belonging to 43 genera and related to 27 families. Ecologically, those taxa can be divided into 4 classes (3 submerged, 7 floating, 13 emergent hydrophytes and 27 terrestrial species). The order of mean values of heavy metals in sediments of the three drains of Manzala Lake is as follow; Fe > Ni > Co > Cd > Cr > Pb. While, the order of mean values of heavy metals in water of the three drains of Manzala Lake is as follow; Fe > Co > Cd > Ni > Cr > Pb. The Contamination Factor (CF) values of Fe, Ni and Cr showed low contamination factor. As it ranged between low and moderate CF for Co and Pb. For Cd, it varied between considerable CF and very high CF in El-Serw, Hadous and Bahr El-Baqar drains. The degree of contamination in El-Serw and Hadous drains ranged between low DC to very high DC.