Sludge Presses for Grease Recovery, Bradford, England
Mechanical method of reducing bulk of wet sludge by dewatering.
This item is part of the 1914 Report on the Collection and Treatment of the Sewage of the City of Philadelphia, which can be viewed here along with two preliminary reports from 1911 and 1912. To see other illustrations from this report, click “1914 Sewage Treatment Plan” in the Subject list.
Among the early mechanical methods of reducing the bulk of the wet sludge by dewatering was pressing in machines (those used at Bradford, England, being shown in accompanying illustrations) which consist of a number of cast iron plates generally 9 square feet in area, with corrugated faces and surrounded by a machined rim so that when placed together they form water tight cells about 2 inches thick.