Troubleshooting Activated Sludge Processes Introduction
Conditions 4 and 5 - White Billowy Foam White billowy foam is caused by high concentrations of surfactants such as detergents. It is not nearly the problem today that it was before biodegradable detergents were used. Condition 4 occurs at start-up of a system where a young sludge exists due to low mixed liquor suspended solids concentrations.
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