West by Southwest to Stickney

Chapter 6 Photos, 21–45

(photos 1–20 here)

Central Area Water Reclamation Plants

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Photo 6.36

April 21, 1936. Still under construction, this tank is the first bay in the aeration tanks for battery A. Air in the steel pipe in the tank bottom will be purged through diffusers to mix with sewage from the preliminary settling tanks. The rising air bubbles induce a helical motion as the flow proceeds from one end of the tank to the other. Microorganisms in the flow will thrive on the dissolved oxygen and digest the organic matter, producing a mixed liquor of water and floc. (MWRD photo 21087)