الفهرس 
INTRODUCTION AND LITERATURAL REVIEWOnly 14 pages are availabe for public view
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Abstract
ABSTRACT
Sludge treatme~t and disposal is major consideration in the planning
and design of new wastewater treatment plants and in the expansion
and upgrading of existing facilities.
In Egypt, all the wastewater treatment plants are using the natural
sludge dewatering system, sand drying beds method. But during the design
phase of wastewater treatment plant for Alexandria City, a problem
of land availability was faced. So, the study was done by using vacuum
assisted-drying beds method for sludge dewatering instead of ordin-a.ry
sand drying beds.
The different options for sludge dewatering were discussed then
the vacuum assisted-drying beds method was chosen for the facing for
the problem of land.
This study discusses the sludge dewatering using. the vacuum
assisteddrying beds method with or without the use of polymers additions
and comparing it with the ordinary sand drying beds technically and
economically. ’
Due the tests done, it can be seen that the success of the vacuum
assisted-drying beds method for sludge dewatering is high with the
use of polyelectrolyte polymer but in the other hand the designer must
try the ordinary sand drying beds firstly before using this method
for economy & its facilities in maintenance, labours requirements and
construction.