MIL-HDBK-1165
b) Spray apparatus - automatic spray heads are
recommended for aircraft rinsing, but not for washing, for the
same reason listed above.
c) Automatic shutoff spray nozzles - these devices are
designed for facilities with manual rinsing. They are the same
basic design as a garden spray nozzle. Considering that water is
usually left on during the entire time a vehicle or aircraft is
washed and rinsed, the automatic shutoff spray nozzle can save
tens to hundreds of gallons per run.
d) Low flow and high pressure hot water units - can
reduce the amount of water and solvents used by facilities for
cleaning engine components. The standard method for cleaning
engine parts has been to use organic solvents or low-pressure
cold water. High-pressure hot water greatly reduces the required
amount of water and solvents, which may require handling as
hazardous waste. Reduction in solvent use also contributes to
the installation's pollution prevention goals.
e) Pre-wash areas - for tracked vehicle washracks with
recycling systems, to eliminate a majority of the coarse dirt so
that it will not enter into and clog up the treatment system.
5.3.1.4
Water Recycling, Reclamation, and Reuse. The
costliest, but most highly effective way to reduce water usage at
wash and rinse facilities is to implement a wastewater recycling
system. The type of wastewater treatment system you choose will
depend on the configuration of your facility. Figure 13 shows
possible water recycling systems for two common types of
automatic vehicle washracks; (1) tunnel (gas station car washes)
and (2) rollover. Passing through these systems, treated
wastewater is recycled back to the washrack for reuse.
a) Recycling. Remember, the treatment system must be
capable of providing water with acceptable quality before it can
be recycled. The recycled water's quality depends on what system
components are used and the components of the incoming water.
The water used on wash racks needs to be relatively free of
abrasive materials, oils, or salts that might damage or stain the
vehicles you are washing, and it also must be free of chemical or
bacterial agents that might harm the operators of the washrack.
Wastewater treatment systems are likely to contain the following
components: sand traps, oil and water separators, screen filters,
coarse/polishing filters, and storage tanks for the treated
water.
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