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Case Study for Customer Location
CA54:
Reservoir or Lake Use:
Industrial paper packaging plant wastewater treatment system.
System Overview and Reservoir:
This is a 2-pond, continuous discharge system to treat
wastewater from an industrial paper packaging plant. The flow
rate is 2.0 MGD, with 100% of the flow to Pond 1
(settling/separation), then to Pond 2 (primary/aeration). Total
system detention time is 13 days. Pond 1 is 3 acres in area, 8
ft deep, 8M gallons, loading is 120 lbs of BOD/acre/day, and has
no grid aeration. Pond 2 is 6 acres in area, 10 ft deep, 18M
gallons, and has 210 hp of grid aeration that was operating 24
hours per day. Most critical discharge permit limits are: 30
mg/L BOD, 30 mg/L TSS, with no ammonia limit.
Reported Problem Before Installation:
Major objectives were to reduce the high energy costs and
maintenance for aeration equipment in Pond 2, and eliminate
short-circuiting.
Installation:
Date: June 2001, installed two (2) units equal to SB2500 with
24-hour electric kits into Pond 2. January 2004, upgraded both
units to SB10000s with 24-hour electric kits.
Results:
Customer was able to reduce aeration hp/run time by as much as
75% with the two SB2500 units, running only 60 hp 24-hours/day
instead of 210 hp. Energy savings gave a payback time of less
than one year. With the SB10000 units, customer can now run one
15 hp aerator at the pond’s inlet and one 40 hp unit only a few
hours per day. The upgraded SB10000 units continue to work well,
allowing the plant to operate the ponds with minimal aeration.
Furthermore, the customer was able to take a 10% Solar Tax
Credit and accelerated depreciation for their purchase of the
SolarBees. Customer is very happy with the SB10000s.
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