Straggler Floc
Straggler floc is a large, light-colored, very fluffy floc that can be filamentous or not. A microscopic examination will quickly reveal whether it is filamentous or nonfilamentous. Poor clarifier design and high influent or return flows exacerbate the effects of straggler floc. Reducing return rates is frequently beneficial.
All filamentous growth conditions can result in the development of filamentous straggler flocs, and the control actions associated with those should be followed. Try on/off aeration or step-feeding in severe cases during peak flows. If that doesn't work, you may need to modify the clarifier.
Nonfilamentous straggler floc can be found in areas where organic loading changes have caused certain flocs to grow quickly. It is necessary to apply oxidative pressure, which increases the total sludge units while decreasing the food-to-microorganism ratio. As a result, a slight reduction in wasting and a slight reduction in returns frequently solves the problem.
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