الفهرس 
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Abstract
With The increasing of environmental concerns, new practices
and management procedures are being currently under deep
investigations. Among the worldwide new motivated interests, comes
the wastewater disposal and control. Many countries are studying the
application of new regulations on wastewater management, and its
possible implementations. The main problem was the high initial and
running costs for wastewater treatment.
This study concerned about the improvement of new treatment
system called DBAF to increase its efficiency. A pilot unit previously
designed by others was developed & installed in El Berka wastewater
treatment plant. The pilot unit was monitored over 9 months of
continuos operation. The development was the addition of air to the
bottom of the down flow filter part.
The results of this study indicate that the DBAF pilot unit
achieved 98%, 98 %and 98 % average removal efficiencies for TSS,
BOD and COD respectively with effluent concentrations 8, 9, and
19m9IL respectively. The up flow filter efficiency is almost fixed
even with the increase of the air rate. The aeration at the bottom of the
down flow filter and the increase of the air rate enhanced its removal
efficiency, which achieved 98 % average removal efficiency for all
measured parameters. The pilot unit is affected by the change of the
temperature where the pilot unit achieves high removal efficiency in
August and September at both upflow filter and down flow filter .
KEYWORDS:
Wastewater Treatment, Biological Treatment, Secondary
Treatment, Biological Filtration, Aerated Bio-Filter, Aeration
Efficiency.