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Case Study for Customer Location
MT59:
Reservoir or Lake Use:
Municipal wastewater treatment system for a population of 5,700.
The city currently does not have discharge limits because of the
infiltration pond. They monitored effluents during 1999 with the
following results: 20-100 mg/L BOD, 20-40 mg/L TSS, and the
ammonia levels were around 11.3 mg/L.
System Overview and Reservoir:
The primary pond is 40 acres in area, 5 ft maximum depth, with a
BOD loading of about 28 lb/acre/day. There is no grid aeration.
Flow rate is 0.7 MGD, with a 100% to primary pond, then into the
40-acre infiltration pond (IP) where the water goes underground
to the Yellowstone River. System is continuous discharge. Exact
detention time unknown because percolation process varies.
Reported Problem Before Installation:
Sludge had accumulated in the primary cell to the point that a
large island appeared when water levels were low. Spring odor
events at ice-out typically lasted 3 weeks or more.
Installation:
Date: Sept. 1999, installed six (6) units equal to SB2500 in the
primary pond.
Results:
Soon after SolarBee installations odor control was achieved and
sludge reduction had begun. By November 2001, overall sludge
depth of pond was 14.5 inches, and by August 2002 it was
approximately 11 inches with the major mound around the influent
reduced considerably. Spring odor events at ice-out now lasts
less than 3 days if at all; odors for the most part are now
non-existent. Also, the primary pond used to go septic during
hot weeks in July or August for a week or two, but now that does
not happen. The superintendent indicates that the system is
working well and objectives are being met. The city is happy
with the performance of the SolarBees, and appreciates the
benefits they have seen in the primary pond.
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