Common Activated Sludge Microorganisms Chart

Tetra Tech’s Common Activated Sludge Microorganisms Chart is a companion to the Activated Sludge Troubleshooting Chart. This new chart is a compilation of photomicrographs taken by Ron Schuyler, P.E., B.C.E.E., to illustrate the various microorganisms that can be observed in the activated sludge process.

These photomicrographs include:

  • Bacteria – flocculated and individual cells
  • Amoeba protozoa
  • Flagellated protozoa
  • Free-swimming ciliated protozoa – bulk-liquid, crawlers and carnivores
  • Crawling ciliated protozoa
  • Stalked ciliated protozoa
  • Metazoa – rotifers, nematodes, water bears, ostracods, and others

Also included is a relative predominance chart to show growth relationships among organisms, as well as a notes section to explain some of the details regarding the microorganisms. The Common Activated Sludge Microorganisms Chart is a laminated 23.5” x 36” sized poster that is equipped with a dry-erase pen.

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