West by Southwest to Stickney

Chapter 6 Photos, 21–45

(photos 1–20 here)

Central Area Water Reclamation Plants

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Lake Claremont Press: A Chicago Joint

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Photo 6.42

October 20, 1938. Installation of 96 rotary vacuum filters is nearing completion. Most of the water in sludge is extracted by rotary vacuum filters. A vacuum is maintained inside the drum, sludge is drawn onto the filter cloth from a trough on one side of the drum while the drum rotates slowly. By the time the drum rotates one-half turn, the sludge becomes a moist cake and is scraped off the filter cloth on the opposite side of the drum. (MWRD photo 24497)