Solutions addressing the classic
problems of ground impermeability and thaw instability associated
with permafrost...
ExtremeSTP models XSTP150, XSTP500, XSTP750,
and XSTP900 sewage treatment plants are built to operate above
ground in an arctic environment without need of a building or
other enclosure. Larger above ground models can be ordered for
specific projects.
XSTP models are assembled inside a super-insulated,
3-compartment tank. The tank is made of foam insulation sandwiched
between fiberglass on the inside and outside. The first compartment
pre-treats the sewage by retaining floating and settling solids.
In the second or "aerobic treatment compartment," a
Bio-Microbics FAST® (fixed activated sludge treatment) insert
aerobically (with oxygen) treats the wastewater and a UV (ultraviolet)
light disinfects the wastewater.
The third compartment provides effluent flow control.
Treated effluent is retained in this compartment until the water
rises to a predetermined level, then an automatic dosing siphon
(that has no moving parts) allows the water to discharge out of
the system at about 30 gpm (gallons per minute) for about one
minute. Even at -60oF, when warm water is discharged at this rate
and quantity, it does not freeze at the point of discharge but
rather flows away from the system before soaking into the natural
vegetative mat, into the ground, or freezing on top of the ground.
Thus ice buildup at the point of discharge is minimized or eliminated.
