Attack of the Free-Swimming Ciliates

An infestation turns secondary clarifier effluent a milky white. An increase in dissolved oxygen and other adjustments cure the problem.
Attack of the Free-Swimming Ciliates
Figure 1. Solids rising and extending across the clarifier surface. (Photo by Ron Trygar)

A troubleshooter receives a phone call from a frantic operator who has described a very unusual condition at his wastewater treatment plant.

Operator: Can you come out to our treatment plant and give me some advice about an unusual-looking effluent?

Lab Detective: Sure. What seems...

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