الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
One of the main problems which faces the designer that; there are several methods available
for the selection of the best wastewater treatment technology but these methods had a lot
variables that may be not available to get them in the beginning of the design which minimize
its possibility for application, the Egyptian Code doesn’t contain a certain method used for
selection the type of appropriate Treatment.
So, most of the designers don’t study the selection procedure, they just apply the available
technology they used before or choosing the well-known type of treatment without applying
the engineering parameter and this selection could be unsuitable, which may cause wasted
money, problems in operation and maintenance and reduction the quality of treated wastewater.
The major goal of this research is to determine a suitable selection methodology easy to apply,
can be used for selection the most appropriate wastewater treatment technology according to
the chosen governed conditions.
The methodology will apply on biological treatment, and five secondary treatment processes
were taken for this purpose. The selected treatment technologies that were taken for
examination and assessment are Conventional Activated sludge, Trickling filter, combined
system, Oxidation pond & Extended aeration that mostly used in Egypt.
The governed parameters in this study are population, characteristics of raw sewage (BODCOD
-TSS), Site conditions (required area –type of soil), characteristics of treated sewage
(BOD- COD -TSS) and Cost (Construction cost, Running cost & maintenance cost)
A study procedure is proposed to select the optimum wastewater treatment technology. The
procedure is carried out in two parts technical and financial evaluation. The technical evaluation
is developed to choose the acceptable treatment technology that can be used for a certain
governed condition, as population, characteristics of raw sewage. Financial evaluation is
resulting by using financial diagram which conducted among acceptable treatment
technologies, taking into consideration construction cost, running cost & maintenance cost.
The proposed procedure has been applied on five existing plants as case studies after the
evaluation; comparison between study procedure result and the applied technology in the site
is carried out. This resulted that several sites could use more efficient and cheaper methods if
their designers used the developed study procedure for technology choice.