Challenges and Opportunities for Innovation in the Public Works ...

Fort Harrison Expects Quick Payback
on New Steam Controller
Anew steam dispatching control
system (SDCS) being demonstrated
at Fort Benjamin Harrison, IN,
may save up to $190,000 in its first y,, ar
of operation. CERL installed the SDCS
on Fort Harrison's district steam distribution
system last year under FEAP.
In this steam distribution system, the
steam demand depends mainly on the
outdoor temperature. The SDSC uses a
temperature sensor interfaced with a
controller that dispatches just slightly
more steam pressure than is needed to
serve the most remote customer's
demand.
Steam dispatching
This strategy differs from traditional control system senses
district steam heating systems, which customers' needs by
maintain a constant steam pressure outdoor temperature
regardless of demand. The SDCS's lower and automatically
pressure means lower temperature, so adusts steami producthat
energy is saved by reduced heat loss tion to meet the
and by lower steam losses through leaks demand
and faulty traps.
The SDCS at Fort Harrison cost abont For more information on SOCS tech- USA-CERL (outside IL), 800-252-7122
$180,000. If it continues to perform as it nology, contact Ralph Moshage at CERL, (within IL); or Bernie Wasserman,
has during the 8 months of the study, the COMM 217-398-5544 or toll-free 800- EHSC, 703 -355-2238. U
annual savings can be projected at
$190,000 for a simple payback of I year.
Comments? Reed Bed Dewaters Sludge, Leaves
Suggestions? Low Residuals
Do you have a topic you would
like tou he feat pin aoupcomg
like to see featured in an upcoming
A n innovative sludge dewatering
system can end many of the problems
experienced with conventional sand
A 20,000 square foot reed bed system
has been installed at Fort Campbell, KY,
to demonstrate this technology. The reed
was planted in spring 1990 and was fully
issue of the FEAP Technology drying beds -- long dewatering times, grown as of summer 1991. The system is
Transfer Bulletin? An idea about media clogging, and weather vulnerabil- currently handling about half of the
how we might improve our
publication to serve you better?
We'd like to have your input!
ity, to name a few.
A reed bed system uses the common
sludge generated by Fort Campbell's 3
million gallon per day wastewater
treatment plant. The reed bed leaves a
reed Phragmites which is planted on a very low volume of residual that must be
Please send your comments to: modified sand bed. Sludge is dewatered hauled away for disposal.
by drainage and evaporation, and the
FEAP Information Center reed stabilizes the organic matter. For more information on alternative
PERL.TBoxE9005Pdewatering technologies, contact Dr.
P.O. Box 9005 Advantages of reed beds include low Byung Kim at CERL, COMM 217-373-
Champaign, IL 61826-9005 costs for: initial purchase, operation and 7281; or Malcolm McLeod, EHSC, 703-
maintenance, and sludge disposal. 355-3151. 0
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