Greywater
is plumbed to a series of separate wastewater treatment and filtration
tanks. This System consists of a Surge Tank for flow control, an
Aeration Tank to produce aerobic conditions and a Clarification
Tank to return the settled solids back to the Surge Tank. An extremely
energy efficient air compressor provides an abundant amount of air
to continuously circulate the wastewater.
Utilizing
the standard wastewater treatment technology of extended aeration,
the water is aerated and bacteria grow on the interior surface
walls of the tanks. As the water is circulated by the 67 watt,
110 volt linear air compressor the bacteria clean the water in
a natural process. By separating the toilet flow from the greywater,
the estimate for water consumption and greywater treatment is
40 gallons of wastewater per person per day. Based upon 24-hour
retention for adequate treatment of the greywater, the estimated
treatment capacity of each Greywater Treatment System is 250 gallons
per day. For flows over 250 gallons per day additional Greywater
Systems are added and installed in parallel. The aeration and
circulation process biologically filters the wastewater, producing
a treated wastewater effluent quality that can then be efficiently
and economically filtered and disinfected for reuse. The quality
of the treated water was independently tested by Olmsted County,
MN and documented the following reductions. TSS 5088%, Kjeldahl
Nitrogen 83-90%, BOD 78-93% and Fecal Coliform 1000 fold.
Each
of the three rotationally molded polyethylene cylindrical tanks
are 26 in diameter and 51 high. Each tank has a 60
degree cone welded into the bottom of the tank and all of the
plumbing pipes for aeration and sludge removal are installed at
the factory. For ease of maintenance, a sludge removal system
pumps solids from the bottom of each tank to the BMRC for final
treatment.
Installation
takes two persons about three hours and consists of connecting
the tanks together with the 2 Fernco connectors, adding
water and adjusting the aeration manifold.
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