الفهرس 
LITERATURE REV IEWOnly 14 pages are availabe for public view
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Abstract
This research is aiming at investigating the technical &
economical feasibility of adding chemical coagulants to
improve the efficiency of the primary treatment step and
determine the possibility of using enhanced primary
treatment instead of secondary treatment in small villages
and towns in Egypt which suffer the lack of adequate funds
and trained personnel needed for secondary treatment
plants. This research work includes these stages :*FIRST
STAGE :- In this stage focus was directed to conduct
laboratory studies to determine the effect of every type
avai lable of chemical coagulant in the removal efficiency
of BOD & TSS .
*SECONo STAGE In
which chemical providing optimum
removal efficiency was
zenein to determine the
used in the fullscale plant of
appropriate dosage for best removal
efficiency .
*THIRo STAGE:- Experiments were conducted on piolt scale
tube settlers model to study the effect of adding chemical
coagulants in improving the BOD and TSS removal efficiency.
The study conclusions are as follows :-
1- Ferric chloride is the best chemical with respect to
treatment efficiency and cost with max. R.R. obtained for
BOO & TSS are 62% & 91% respectively.
2- Polymers have little effect in improving the removal
efficiency of pollutants.
3- There is increase in removal ratio by an average of 20%
for BOO when ferric chloride was added in the tube settler
at a dosing range from 20-30 p.p.m.