الفهرس 
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Abstract
The recycling and reuse of the Egyptian wastewater in agriculture has received more attention during the last decades as many countries around the world. However, health risks and costs are always subjects that need to be taken into account.
The actual problem is that most of the current wastewater treatment plants are filled to capacity, not operational and may bypass significant parts of its influents without any kind of treatment causing serious health risks if reused in agricultural purposes.
The overall objective of this research is to investigate using a combination between two treatment methods, namely wetland system established near to the Manazala Lake on the main stream of the Bahr El-Baqar drain and effective microorganisms (EM) to improve the quality of wastewater.
More specifically, the study comprise two main experiments, the main objectives of the first experiment is to examine the ability of EM to reduce the pollution loads in a water sample and secondly to identify the best concentration, which may be recommended.
The two experiments comprised analyzing seven water quality parameters including pH, TDS, TSS, DO, BOD, Cd, and Cr.
The results obtained from Experiment 1 were statistically analyzed using means of statistical comparisons such as Analysis of Variance (ANOVA) or Kruskal Wallis Test to compare between the percentages of accumulated reductions of some parameters expressing pollution levels as a result for adding the different EM concentrations (1:100, 1:1000 and 1:10000) to water samples.
The main objective of Experiment 2 is to investigate the effect of combining the use of especial concentration of EM with constructed wetland established near to the Manazala Lake on the main stream of the Bahr El-Baqar drain Eastern Nile Delta of Egypt.
Water samples were taken (for both experiments) from the Bahr El-baqar drain as one of the most polluted drains in the Nile Delta that includes almost all sources of pollution such as agricultural, municipal and industrial wastes.
The results of experiment 1 showed that there is a significant potential for the EM to improve most of the examined water quality parameters. In addition, the 1:10000 concentrations had the highest ability to improve most of the examined WQPs in the water samples.
The results of experiment 2 insure that using a combined system (EM + Wetland) can significantly improve most of the examined WQPs for the contaminated water in Bahr El-Baqar drain.
It is expected that the successful operation of the combined system (EM + constructed wetlands) will encourage replicating the technology in other parts of the Egyptian drainage system. This will significantly improve both: the reused drainage water quality and the quality of water flowing to the northern lakes.