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VFT
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Wastewater
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Bioremediation
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HPOWER
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Recyling
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Oil Refinery
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Wastewater
Introduction
Screening/Grit
Primary Settling
Solids
Digester
Drying Beds
Belt Filter Press
LSPS
Liquids
Aeration Basin
Final Settling
RAS
Filters
Reuse Tank
Chlorine Contact
Zone of Mixing
Outfall Area
Personnel
Flowchart
Plant
Map
Assignment

Click here to experience the actual
smells of the primary settling tanks.
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Primary
Settling
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This is a primary
clarification (or primary settling) tank. The bars you see
which run across the width of the tank are moving slowly
away from you.
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As the bars move
across the water, the floating grease and scum are pushed to
the far side of tank.
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Once these bars
reach the far end of the tank, they continue downward to the
bottom and begin moving toward you.
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Solids that settle
to the bottom of the tank are pushed along the bottom in the
opposite direction and are collected on the near end of the
pool and will eventually be scooped up into basins known as
hoppers.
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At this point in the
treatment, the sewage has been physically separated into two
parts: solids and liquids (the primary effluent). This
liquid still contains organic matter that will be decomposed
by microorganisms which will digest complex organic
wastes.
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The solid matter and
the fluid matter will now follow separate pathways for
treatment.
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Path of
Solids
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