UFC 4-150-02
12 May 2003
minimize flow variations, flow equalization should be considered. Equalization can be
applied to specific flows (such as industrial flows or other specialized flow types) that
exhibit wide variations to the entire wastewater flow. When calculating flows, consider
the following.
Industrial flows such as vehicle and aircraft wash facilities. If these flows
coincide with peak domestic flows, then they should be added to the peak
flows.
Ship holding tank discharge flows. Flow rates will depend on the total
volume of flow and the time required to convey the wastewater to the
treatment facility. Design equalization systems to equalize the flows in
order to minimize their effects on peak flows. Consider conveying the ship
wastewaters to the treatment facility at night when domestic flows are low.
Intermittent flows due to military functions. Periods of increased sewage
flows will occur because of training activities or other personnel
mobilization exercises common to military installations. Training activities
or other mobilization exercises will create short-term increases in domestic
wastewater and possibly industrial flows. These intermittent activities may
create the peak wastewater flow rate. Design the sewage collection
system to handle routine variations in flow resulting from training and other
routine military exercises. The design must ensure acceptable
performance with reasonable operational costs. (For example, an
equalization system may provide flow and load dampening to
accommodate these significant variations.) However, do not design
facilities to accommodate peak surges resulting from emergency military
mobilizations.
Intermittent periods of reduced use. Low flows can also be a problem.
Therefore, design the wastewater facility to operate efficiently over a
range of flows. (For example, provide parallel trains that can be taken out
of service.)
Changes in requirements or military mission. Designs should include
provisions for the system's expansion and contraction as well as system
modifications due to more stringent effluent requirements or military
mission changes. In general, maximize operational flexibility.
3-7.2.4
Wastewater Loadings. Wastewater loadings are typically calculated
based on the projected flows and wastewater pollutant concentrations and are
expressed in pounds per day (lb/d) or kilograms per day (kg/d). Where possible,
determine loadings by analyzing the wastewater to be treated. Consult with the Activity
and the cognizant NAVFAC EFD/EFA OR USACE DISTRICT to obtain collected data
and specific instructions.
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