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THE EFFECT OF DIURNAL PEAK FLOW EQUALIZATION ON SLUDGE SETTLEABILITY

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Abstract:

The Burlingame Wastewater Treatment Facility is a 5.5 million gallons per day secondary treatment plant owned by the City of Burlingame, CA, and operated by U.S. Filter Operating Services. The secondary treatment facility includes four rectangular aeration basins and four square secondary clarifiers. The air activated sludge plant has historically experienced sludge settleability problems, with a sludge volume index (SVI) averaging around 400 ml/g and occasional peaks exceeding 600 ml/g. The poor sludge settleability has had severe ramifications on plant operations, often mainfesting in solids washout from the secondary clarifiers. Plant staff had tried return activated sludge chlorination as an operational control measure, but found it to be costly and limited in effectiveness. Microscopic examination was performed and Type 021N and Type 1701 filamentous organisms were found to be the major cause of the bulking sludge. While waiting for long-term improvements (anaerobic selector and additional aeration capacity) to be constructed, plant staff implemented a diurnal peak flow equalization control strategy to help eliminate the Type 1701 filamentous organisms and improve sludge settleability. This paper will discuss the effect this control strategy has on SVI, filamentous organisms, and initial settling velocity of the sludge. In addition, the benefit this control strategy has on elimination of clarifier loading is illustrated via the use of a plant-specific State Point Analysis model.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864703784756174

Publication date: 2003-01-01

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