pa1778data.pdf

well at a rate of .4 gph.
Construction date: 1979.
Installation of equipment: 1979.
U.S. STEEL DUQUESNE WORKS
HAER No. PA-115
(Page 201)
J. Calcium Dispersant Tank: The 6 f -0" diameter x 10 f -0" high,
2000 gallon capacity, calcium dispersant tank is located between
the acid storage tank and the chemical feed pump house.
Installation date: 1979.
K. Gravity Filter Building: Laid out on a east-west axis, the
40'-0" wide x 63'-0" long x 30*-0" high steel framed water
filtration building is located 4'~0" south of the filter cake
building. Built by the American Bridge Company on a concrete
foundation, the building has a corrugated metal exterior and a
flat roof. The southern corner of the building has been removed
for road clearance.
A 7'-3/4" wide x 34'-10 1/2" long x 21»-6" high DeLaval
gravity filter is laid out on a east-west axis alongside the
northern wall of the building. Constructed of steel plate, the
filter is made up of four identical cells which are designed to
remove suspended solids from raw water while maintaining a high
flow rate through a filter. The filter consists of a top layer
of anthracite coal and a bottom layer of sand, supported by
several layers of graded gravel.
A polymer feeding system for the gravity filter is located
just west of it alongside the northern wall. It consists of two
55 gallon polymer storage tanks which are connected to two 1/2 hp
Milroyal A metering pumps.
A 12'-6" diameter x 21'-6" high Delaval backwash holding
tank is located south of the gravity filter near the southern
wall of the building. A 7 1/2 hp motor-powered "Lightnin" mixer
extends down through the center of the tank. Two 7 1/2 hp motor-
powered Morris pumps rated at 180 gpm are located on the southern
side of the tank. The pumps deliver slurry from the holding tank
to the clarifier.
Located just east of the gravity filter and backwash tank,
and laid out on a north-south axis is a ll f -o" wide x 25 ! -0 long
x 15'-0" deep concrete sump covered by grating. The sump is
divided by a V-shaped weir into two sections. Extending from the
northern section of the sump are two 3 0 hp motor powered Morris
vertical cantilevered sump pumps rated at 1050 gpm. These pumps
deliver backwash water to the gravity filters. Located above the
southern section of the sump is a polymer feed system for the
clarifier. The system consists of a small mixing tank, a feed
tank, and a small (approximately 100 gpm) motor-powered pump.