الفهرس 
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Abstract
Wastewater treatment is problem that has plagued man ever since the discovered that discharging his wastes into surface water can lead to many additional environmental problem.
Today a wide range of treatment technologies are available for use in our efforts to restore and maintain the chemical and biological integrity of the nation’s water variety of natural biological systems used to help purify water in a controlled manner, these natural biological treatment systems include various forms of activated sludge, trickling filter treatment and wetland system.
Constructed wet lands are designed to improve water quality and the efficiency is dependent on plant processes.
They are formed by interaction of biological and physical components of the ecosystem capable of removing different types of contaminants from water.
The overall goal of this study is to discuss and evaluate the effectiveness of different media (gravel – rubber – plastic) in the removal efficiency of nitrogen and phosphorus from wastewater.
In general, the present thesis includes three main chapters.
The first chapter deals with the aim of the study and general introduction about wastewater and treatment it using wetland, type of wetlands, different media used, and literature review of the previous studies of the same field.
The second chapter includes the experimental work which preparation of standard, instruments and apparatus, which used.
The third chapter involves of the results and discussion tables and figures which illustrate the results.
The results showed the removal efficiency, BOD removal efficiency raises from 56.33 to 83.29% in plastic cell at Q.max and Q.min, in the same order, from 50.85 to 75.38% for gravel, and from 45.36 to 71.80% for rubber.
NH4-N removal efficiency enhances from 57.43 to 79.19 for plastic cell at Qmax and Qmin, respectively, from 47.80 to 69.13% for gravel, and from 44.89 to 61.84 % for rubber.
TKN-N removal efficiency enhances from 54.05 to 77.03 for plastic cell at Qmax and Qmin, respectively, from 48.00 to 66.61% for gravel, and from 44.71 to 62.35% for rubber.
PO4 removal efficiency enhances from 67.22 to 88.74 for plastic cell at Q.max and Q.min, respectively, from 52.96 to 74.49% for gravel, and from 46.24 to 70.09% for rubber.
This study have be done the different hydraulic flow and the highest removal efficiency in all parameter came in lowest flow 1 m3 / day
At the end we can say the wetlands show effective in removal efficiency and the plastic media show the highest removal efficiency in comparison with gravel and rubber.