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Case Study for Customer Location
CO40:
Reservoir or Lake Use:
Municipal wastewater treatment system serving a population of
about 740 people.
System Overview and Reservoir:
The existing treatment system consists of two ponds. Pond 1 (the
primary pond) is 0.5 acres in area, 9 ft deep, 1 MG capacity,
and the loading is about 281 lb BOD/acre/day. Pond 1 has a 40-hp
grid aeration system running 24 hrs/day. Pond 1 is semi-split by
a partial curtain. Pond 2 (the secondary pond) is 0.5 acres in
area, 9 ft deep, 1 MG capacity, and has a 10-hp grid aeration
running 24 hrs/day. Flow rate to the system is about 0.07 MGD,
with 100% going first to Pond 1, then to pond 2, then to
discharge. This system has periodic scheduled discharge. Total
detention time is 28 days. Most critical discharge permit limits
are: 25/40mg/L CBOD, 75/110 mg/L TSS or 85% CBOD removal. There
are no current ammonia discharge limits.
Reported Problem Before Installation:
The main problems were high energy, operating and maintenance
costs from the aeration systems, unacceptable noise levels from
the aeration system, sludge accumulation in the ponds, odors,
and maintaining acceptable water quality of the final effluent.
Installation:
Date: April 2000, installed two (2) units equal to SB2500, with
24-hour electrical kits, one on each side of the curtain in
primary Pond 1.
Results:
Customer has been able to reduce aeration run times in half with
similar savings in power costs. Because the circulators run
silently, reduced aeration also means reduced noise. By January
2003, sludge depth had been reduced about 2.5 ft in center of
pond, and about 1 ft along the pond’s edges. During the first
few years the plant remained in compliance with CBOD and TSS
limits most of time, with only occasional spikes. The intake
depths were lowered in 2004, which improved consistency and
enabled the plant to meet all discharge limits and maintain good
sludge stabilization. The customer is very pleased with the
results.
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