الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
In many areas where water sources are limited reuse of wastewater has become important factor in water resources planning. For any purposes of wastewater reuse, remaining nitrogen concentration in the wastewater effluent is of great concern to the design engineer, because of many environmental problems such as :
1-Toxic effects of ammonia on aquatic life and fishing.
2-Use of nitrogen by aquatic plants increase the rate of eutrophication in receiving water.
3-Decrease of dissolved oxygen in the receiving water resulting from oxidation of ammonia nitrogen.
4-Possible transmission of nitrate nitrogen into drinking water and consequently health risks.
5-Increase the chlorine dose and disinfection, increase the cost of the treated water.
6-Odor problem when the ammonia concentration become more than 17 mg/L at Ph greater than 8.
7-Water contains ammonia causes acid rains which is considered the key component of ozone pollution.
8-The presence of ammonia with phosphorous can lead to the development of undesirable aquatic life.
So the removal of ammonia nitrogen from wastewater prior to its reuse has become a major concern.
There are several treatment methods used in the present time for removing ammonia nitrogen from wastewater, these methods include physical, chemical and biological treatment but these methods suffer from several disadvantages and need special conditions for being applied.