North Carolina National Guard
The North Carolina National Guard's Combined Support Maintenance Shop
(CSMS) in Raleigh services military vehicles up to 20 tons in weight from 100
armories throughout NC. These vehicles include CVCVs, HUMMWVs, tankers,
forklifts and earth-moving equipment. The shop is typically staffed by a crew of 34
mechanics. In response to increasing costs for hazardous waste management and a
Federal Executive order mandating a 50% reduction in pollutants by 1997 (1994
baseline), the facility has implemented a range of sound pollution prevention and
waste management practices over the past 3 years. These practices have reduced the
quantities of waste generated by the facility and also resulted in monetary savings.
Aqueous Jet Washer
In 1993 the facility purchased an aqueous jet washer. This large 2,000-pound unit
cleans a range of vehicle components up to an entire engine block in size. The
parts washer uses 140 gallons of recirculated biodegradable soap solution, typically
over a 40 minute cycle time. Small quantities of defoamer and rust inhibitor must
also be added to the solution periodically. When not in use, the soap solution is
held in a reservoir that has an oil skimmer attachment to remove oil and grease.
After conducting initial testing for metals, the facility found the spent soap solution
could be dumped to the sewer system every 2-3 weeks.
The jet washer costs $10,000, and batches of solution cost $45 to prepare and
must be replaced every three weeks. This results in an annual raw materials cost of
approximately $800. However, since the installation of the aqueous jet washer, the
facility has been able to eliminate 2 parts washers and 1 carburetor cleaner. The
annual operating costs of the parts washers are approximately $1400, so $600 are
saved annually in operating costs alone. Additional benefits include reduced labor
invested in hazardous waste management and reduced liability since hazardous
waste is not generated on-site or shipped off-site. The washer has proven so
effective that the facility plans to purchase another unit in the near future.
Details of Reductions
Additional Information :
Biodegradable Floor Cleaner
The facility cleans its floor every 2 weeks with a biodegradable floor cleaner. This
cleaner can be rinsed directly to the drain and sewage system.
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