MIL-HDBK-1005/16
interference or pass through or exceed effluent discharge limits
(some sewer use ordinances also contain specific numerical
limits)
d)
Pollutants which result in the presence of toxic
gases, vapors, or fumes within the sewerage system that may
cause acute worker health and safety problems
In addition to these provisions, many POTW sewer use
ordinances prohibit oil and grease discharges that could
accumulate in collection system piping and obstruct flow, or
that could accumulate in the sludge of treatment works,
resulting in hazardous substance disposal requirements.
5.3.2
Related Impacts on Collection/Treatment Systems. In
addition to impacts outlined in regulations, wastewater
containing significant quantities of oil and grease can impact
the collection and treatment systems in the following ways:
a)
Accumulation of oil and grease in collection
piping, causing obstruction of flow
b)
Accumulation in treatment facility sludge,
resulting in hazardous substance disposal requirements
For these reasons, wastewater discharges from
maintenance facilities and washracks should be managed to
prevent adverse effects to the treatment plant and to protect
the environment from releases to surface waters.
5.4
Evaluating the Need for Oil/Water Separators.
Numerous oil/water separators (OWSs) exist at military bases,
some of which are not needed or are not accomplishing their
intended purpose. Misapplications and inadequate performance
have resulted from poor design, improper selection of pre-
manufactured units, failure to adequately understand the
character of wastewaters being treated or pretreated, and lack
of proper maintenance. Consequently, the need for an OWS should
be carefully evaluated before undertaking its design.
Figure 10 presents a decision diagram for determining
whether an OWS is needed at a particular location. In using the
decision diagram, the following source control issues should be
considered:
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