Wastewater Treatment Systems - page 20

20 •
How It Works
Highland Tank's patented oil/water
separators are stationary wastewater
treatment tanks, filled with water. They
contain specially designed internal
baffles and coalescers to accelerate
the separation process.
The tank is designed to allow convenient
access for inspection and maintenance
from above. Inlet flow is directed against
the velocity head diffusion baffle to
reduce flow turbulence and to distribute
the flow evenly over the separator's
cross-sectional area.
In the sediment chamber, heavy solids
settle out and concentrated oil rises to
the surface. The oily water then passes
through the Corella
Coalescer, an
inclined arrangement of stacked,
parallel, flat and corrugated plates.
The corrugated underside of the
plates causes the oil to
coalesce into sheets.
The oil globules then rise to the surface
of the separation chamber, where the
separated oil accumulates.
Any remaining solids sink to the top
of the plates and slide off the plates to
the solids collection area. The effluent
flows down and toward the outlet and
is discharged by gravity displacement.
A Petro-Screen polypropylene
impingement coalescer (an encased
bundle of layered oil-attracting fibers)
is used to intercept droplets of oil that
are too minute to be removed
by Corella
Manway Vent Piping**
Model HTC Oil/Water Separator
with EZ Access option shown.
*Optional equipment available from Highland Tank.
**Installer supplied equipment
Inlet Vent Piping**
Concrete Top Pad**
Flanged Inlet Piping
Sediment Chamber
Underflow Baffle
Isolation Spool Piece
(where required)
Electronic oil level controls sound an
alarm at high oil levels so that waste
oil can be removed from the separator.
Double-wall separators are monitored
with electronic leak detection systems
for the interstitial space.
Pea Gravel or other
approved backfill material
Cleaner, Safer, Smarter
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