Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
Effects of Expansion of Gas Bubbles in Enscher Sludge, Shown in Right-Hand Cylinder
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.
These gases while in the sludge, are under a hydrostatic pressure due to the depth of the tank, and when the sludge is withdrawn upon the drying bed the bubbles expand, lightening the mass and aiding in a separation of the water, which flows to the bottom and is carried away by the drains of the drying bed. This is shown in the accompanying illustration.