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Proper sewage
treatment, like the Scarab system, allows the natural
biological process to break down (or biodegrade) the
harmful sewage elements, into simple products that no longer
pollute or harm the environment. The process includes a
method of disinfection with Ozone or chlorine, ensuring the final discharge of
the water is free of dangerous bacteria and viruses,
which include cholera, dysentery,
typhoid, and in many cases,
malaria. Unsanitary
conditions and untreated sewage, as seen recently
in Zimbabwe, is the prime cause for the outbreak of
cholera in that region.
Scarab
Bio-Reactor
The
Submerged Fixed Film type Bio-Reactor is
comprised of
the following main components:
•
Balancing
Unit
The
Balancing Unit has been designed to regulate the hydraulic
loading of the Bio-Reactor. This is done in such a way
that only a fixed volume of effluent is delivered to
the Bio-Reactor at any given time, thus eliminating
hydraulic variance and ensuring continuous optimum performance.
Any temporary abnormal variance in the hydraulic loading
is stored in the final chamber of the Septic Tank until
such time as the Bio-Reactor is able to process
the additional effluent.
•
Mixing Chamber
Incoming
effluent from the Balancing Unit is introduced into the Bio-Reactor in the Mixing Chamber. The anaerobic
effluent is mixed with the partially aerated effluent
in the base of the Bio-Reactor and allows for the removal of
the heavier settled solids which accumulate on the base
of the Bio-Reactor for return to the first chamber of
the Septic Tank for further degradation.
•
Pump and Circulation Chamber
Partially aerated effluent is
delivered from the Circulation Chamber to the Accelerated
Oxygenation by way of the circulation pump. Each litre
of effluent is circulated and re-oxygenated numerous
times in order to achieve optimum oxygen saturation.
•
Accelerated Oxygenation Unit
The Accelerated Oxygenation
Unit performs the function of supplying oxygen to the
effluent in the Bio-Reactor. The
mixing of air and effluent under pressure, allows the
effluent to efficiently absorb oxygen with a longer
retention time and carry it throughout the Bio-Reactor
to facilitate the optimum growth of Bio-Mass. The output
from the Accelerated
Oxygenation Chamber enters the Mixing Chamber. Once the effluent is sufficiently oxygenated,
being lighter than incoming effluent, it then rises
into the Biopak Media Chamber.
•
Biopak Media Chamber
The Biopak Media Chamber is
randomly packed with Biopak units to facilitate anchorage
for the Bio-Mass population.
This high surface area to volume ratio allows for the
optimum biomass per unit of volume achievable. This chamber has two outlets, one for the
final treated effluent and one for de-nitrification.
The final effluent is then passed on to the Ozone unit.
A small portion of this nitrate rich effluent from the
Bio-Reactor is then returned to the first chamber of
the Septic Tank for de-nitrification and organic phosphate
removal.
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Pathogen Treatment