الفهرس 
الغلافOnly 14 pages are availabe for public view
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Abstract
The responsibility of water resources management becomes one of the main challenges of
the 21st century. Especially in Egypt were water sacristy has been aggravated since 2005.
This due to urbanization coupled with increasing in population. Moreover, water demand
will be increased unless there are corresponding increases in water conservation and
recycling of this vital resource. So, it will necessitate to concentrate efforts to limit the
demand on freshwater to improve the ability to the future generations to meet their own
needs. There are alternative sources such as reuse of treated water and this will provide
maximum utility of water. The reuse of greywater is one of the most potential methods
which play a significant role towards environmental sustainability.
Nearly (1/3) of total water supply are lost in applications such as toilet flushing especially
in large public and office buildings. So the present study demonstrated that
implementation of greywater reuse technique in the office buildings which can achieve
significant reduction in potable water demand and reduce about 33% of the total annual
water bills. All results obtained according to Egyptian codes, data books and reliable
organizations which provide information help in calculation methods and design.
Greywater system can be used economically in different purposes such as toilet flushing,
landscaping irrigation, industrial cooling towers, building construction and car washing.
The present study also, analyzes the performance of a pilot scale treatment unit used to
treat light greywater collected from a household‘s wash hand basins and showers. This
pilot scale treatment unit is designed to simulate the actual performance of the designed
treatment unit in the office building. The collected greywater from household subjected
to certain physicochemical treatment steps and disinfected by UV radiations. The
laboratory analysis for the collected treated samples reveals significant results in removal
of turbidity and BOD it can remove about 96% for both also, removes about 82% from
COD this is due to fact that most COD in raw greywater was dissolved. The percentage
of removal of TSS and TP is 45% and 63.40% respectively. More significantly in this