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Abstract
The increasing environmental awareness of the Egyptian authority
to provide proper and economical engineering solutions to wastewater
treatment as part of a national strategy to control pollution is the motive
to carry out researches on adapting treatment technologies to local
environment and improving their performance.
Biological filters are one of the biological treatment technologies
that are promising due to its simplicity in construction and operation in
addition to its environmental attraction of having low energy
requirements.
The research work in this study is aimed towards selection of the
most appropriate filtration media for biological filters, that could be
fabricated locally for sewage treatment plants in Egypt.
The experimental work plan was directed to investigate the impact
of three different plastic media, act as biological filtration media, on the
performance of a Dual Biological Aeration Filter (DBAF). A pilot plant
was designed and installed at EL-BERKA wastewater treatment plant, in
Cairo for this purpose. The three filtration media chosen for this study
are Rushing rings, PVC corrugated pipes, and PVC recycled water
bottles.
Continuous flow pilot plant testing was conducted for one year to
achieve the study objectives. The study resulted in the following
conclusions:
-The combined BOD, COD, and TSS removal efficiency was similar
with rushing rings and PVC corrugated pipes, but lower with PVC
recycled water bottles.
-The cost comparison indicated that the PVC recycled water bottles is 60
to 70 % less costly than the other two media, but technically the rushing
rings media achieved the highest removal efficiencies