الفهرس 
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Abstract
· .
Wastewater oxidation ponds (WOP) offer a significant
financial advantage in wastewater treatment due to their
simple operation and maintenance, as ’dell as, their low
energy requirements. WOP has been considered one of the best
solutions for sewage treatment in arid and semi-arid areas
where land is available.
The experimental investigation has been performed in
order to evaluate the effect of some selected parameters on
pond treatment performance. The selected parameters to the
study are: Solids, biological oxygen demand (BOD), and pH
value. pH values were measured for their effects on the
microbial activity and organic substance reaction. Solids
were measured as suspended and dissolved in both volatile and
nonvolatile form. Suspended solids were expected to exceed
the acceptable treatment level due to the heavy algae
production especially in the upper layer of the pond where
there is more available light than that for the lower layers,
which may reduce the penetration of the sun light to lower
layer and make defects in the dissolved oxygen.
The experimental work included the construction of two
prototype models for the pond. The models where fitted with
a number of outlet noels for sampling from different location
along the flow direction at different levels. These sampling