الفهرس 
Introduction and ObjectivesOnly 14 pages are availabe for public view
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Abstract
Organisms remain one of the most important compositions and principles in the wasterwater , The most important of these organisms which contribute in the aerobic bacteria, where it remains a must to provide it the suitable surroundings for it to keep on living and to increase it activity and reproduction.
The aim of this research is to study treatability aspect and economical side in three types of treatment: -
Activited Sludge System, Oxidation Ditches System and Tricking
Filter System.
Based on the observation and the results obtained from study the following points were conculded :-
The 0.0 system gave the highest COO and BOD % removal comparing with the other two system ( A.S system and T. F system) .
The 0.0 system gave the less cost of the m3 treatment than the other two systems ( A.S system and T.F system)
The 0.0 system id the highest efficency and the decreased one in the economic aspect which can be used Behera governorate .
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