الفهرس 
(II) LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
With the increasing importance of environmental pollution control and
the value of water shortage in the whole world, the interest started to be
noticeable in the developing countries. The big funds and land areas
required affected the distribution of the use of wastewater treatment in
these countries. These reasons led the scientific researchers to
concentrate on the use of local products, by-products, or wastes for new
modified wastewater treatment techniques suitable for each country
conditions. Also, the concentration on minimizing of power
consumption, maintenance requirements, complicated techniques and
imported equipment became one of the main targets for the ongoing
studies. This leads to choose the attached growth system to decrease the
required land, minimize the construction and operation cost as possible.
This study was carried out to check the possibility of applying biological
tower filters with new recycled plastic media under Egyptian
circumstances.
A field continuous flow pilot plant running for one-year period was
conducted to achieve the study objectives. The study resulted in removal
rates ranged between 60 to 85% for TSS, 57 to 83% for BODs and 50 to
84 % for COD. Average values of 70% for TSS, 62% for BODs and
61% for COD were maintained. These values proved the success of the
new plastic media, which was made of recycled PVC crushed water
bottles, to achieve almost the same results as fabricated plastic media.
The study resulted in a modified design equation of the bio -tower:
E = 100/[1 + 0.0326 (2.7 UF/5]
This equation decreases the required volume for the bio-tower media.
The study, also, proved the success of the bio-tower system as the
designed pilot plant, to decrease the required area of this type of plants
by 60% and the construction costs by 50%. The study ensured the
applicability of the recycled plastic as filter media and the suitability of
the bio-tower treatment procedure for Egyptian wastewater treatment for
high organic loads.