pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 235)<br />
concrete foundation, the corrugated metal building is laid out on<br />
a north-south axis. Its gable roof is supported by Pratt<br />
trusses. The building is divided into two rooms. The southern<br />
room contains a small Panner Bros, stamping press in the western<br />
corner of the room. Inside of the northern room are four desks<br />
and three lockers.<br />
Construction dates: ca. 1942.<br />
K. Waste Water Treatment System for the Primary and Bar Mills:<br />
The waste water treatment system for the primary and 22" bar mill<br />
at the Duquesne Works, located just south of the heat treatment<br />
building, treats all contact water used in the respective mills<br />
and recycles it back into their systems. The following<br />
integrates the structures and equipment making up the system with<br />
a description of their function.<br />
1. Clarifier and Sludge Pumps: The 100* diameter x 13' high<br />
Dorr-Oliver clarifier is located just south of the system's<br />
cooling water tower and is made out of steel construction. It<br />
has a 15* diameter centerwell, a 5 hp motor-powered rake and oil<br />
skimmer, and a 2'-6" wide x 3'-0" deep launderer which encircles<br />
its circumference. Two 7.5 hp motored-powered Wemco-Envirotech<br />
sludge pumps with a rating of 100 gpm each are located in a<br />
corrugated metal lean-to that is adjacent to the southern side of<br />
the clarifier.<br />
Waste water from the primary and 22" bar mill lift stations<br />
entered the centerwell at the bottom of the clarifier and rose<br />
slowly, thus allowing about 50 percent of its suspended solids to<br />
settle at its bottom. In order to enhance the coagulation of<br />
suspended solids both alum and polymers were added to the waste<br />
water as it entered the centerwell. The clarifier's skimmer<br />
removed floating oil from the waste water and stored it in a<br />
2,200-gallon scum tank adjacent to the clarifier. The partially<br />
cleaned waste water subsequently overflowed into the clarifier 1 s<br />
launderer and was directed by gravity into a filter feed tank.<br />
The rake mechanism directed the settled sludge to the sludge<br />
pumps where it was pumped to the thickener.<br />
Installation date: 1981.<br />
2. Filter Feed Tank, Process Pump Building, Process<br />
Building, Pressure Filters, and Spent Backwash Tank: Located<br />
adjacent to the clarifier on its southeastern side, the filter<br />
feed tank is an 25 f diameter x 12' high, circular steel tank with<br />
a sloped bottom. The partially cleaned waste water from the<br />
clarifier passes through the filter feed tank into the suction,<br />
which is located in a small well at the bottom of the tank, for<br />
three filter feed pumps. The 5200 gpm capacity Wilson-Snyder<br />
filter feed pumps are located in the process pump building.