MIL-HDBK-1165
the form of charged particles, then permanently fused to the
surface with high temperature baking. Using powder coatings
eliminates the need for exhaust vents and scrubbers for fumes and
water sprays for paint collection, and will not produce "paint
overspray". No hazardous wastewaters are generated. The cost of
installing a powder coating booth system is competitive with
installing a liquid coating booth.
b) Paint stripping facilities. For paint stripping
facilities, the method of Plastic Media Blasting (PMB) may be an
appropriate replacement for chemical strippers. The plastic
beads used for blasting are nontoxic and will not harm or etch
the workpiece's surface (as sand blasting may). A PMB system
also includes a media reclamation device to collect and recycle
the plastic beads after use. Dangerous solvent strippers and
water used for rinsing are eliminated. No hazardous wastewater
is generated. However, the spent bead media must be evaluated
for hazardous contamination prior to disposal.
5.3.4.4
Water Recycling, Reclamation, and Reuse. Wastewater
from painting or paint stripping facilities may contain a number
of hazardous chemicals, making it difficult to reuse in the same
process. Water reclamation may, however, be possible for uses
such as irrigation. Still, depending on the complexity of the
wastewater, extensive treatment might not be cost effective.
Alternately, water from other sources can be used in
paint stripping rinse tanks and paint spray booths, as long as
the water meets the quality standards in the process
specifications. As for metal cleaning facilities, cooling tower
discharge and boiler blowdown water may be suitable water sources
for painting or paint stripping rinse water.
5.3.5
Industrial Laundries
5.3.5.1
Conventional and Water-Efficient. The conventional and
new designs of washers, along with their corresponding water
consumption, are discussed in paragraph 5.2.6. Front-loading,
horizontal-axis washers are a more common sight in commercial and
industrial laundry facilities than they are in residential homes
and thus these facilities are more advanced in the practice of
regularly conserving water. Most large industrial or
institutional laundries use what are termed "washer/extractors"
that are larger versions of the residential washer and provide
more cycle options.
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