Activated sludge helper

Indicative operational guide for activated sludge troubleshooting: SVI, effluent suspended solids, turbidity, foaming, filamentous microorganisms, sludge age, dissolved oxygen and nitrification.

Activated sludge operational guide

This guide walks operators through a decision tree for settling problems, foaming, effluent suspended solids, turbidity, filamentous microorganisms and nitrification.

This guide is an indicative aid for operational diagnostics of activated sludge. The result does not replace laboratory analyses, microscopic examination or a site-specific process assessment. Always verify recommendations against local conditions, current measurements and operating rules.

SVI > 150 mL/g?

Use the current sludge volume index from settling and mixed liquor suspended solids measurements.

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