(4) The general condition of the ship's tanks
expected to be discharged (e.g., new, clean, coated, well
maintained, or dirty and normally full of sludge, scale, and
(5) Whether ballast water is clean sea water or
polluted harbor water.
(6) Whether the treatment system proposed
("ship's waste off-load barge" or fixed shore-based
facilities) meets the standards of effluent water quality
established by local environmental regulations.
c) If it is determined that both simple mixtures and
emulsions are present, consider the possibility of using two
segregated separate systems, one for gravity separation and
the other for breaking emulsions. Avoid mixing the two types
of suspensions when possible. For bilge water and other
contaminated oily wastes which require additional treatment,
refer to MIL-HDBK-1005/9, Industrial and Oily Wastewater
Control or for Army and Air Force projects MIL-HDBK-1005/17,
Nondomestic Wastewater Control and Treatment Design.
d) For typical schematic arrangement of ballast
water treatment and disposal systems, refer to NAVFAC P-272.
188.8.131.52 Receiving and Settling Tanks
. The minimal ballast
water receiving facility usually requires two storage tanks,
usually of equal capacity, to be used alternately as receiving
and settling tanks. If these tanks are sized to allow 4 to 5
days undisturbed settlement, separation of simple suspensions
of light oils in water can be achieved. Use welded steel
vertical aboveground storage tanks designed and constructed in
accordance with Section 8 of this handbook. In addition to
complying with Section 8 of this handbook for construction
appurtenances, provide the following fittings and
a) An automatic float gauge suitable for use with
transmitting device for remote readout.
b) One cable-operated swing-line assembly on the oil
c) One shell fill nozzle.