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Using Simulation to Predict Bulking Caused by Dynamic Process Loading

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A high purity oxygen (HPO) activated sludge wastewater treatment plant (WWTP) had been converted from fully aerobic, high dissolved oxygen (DO) operation to an anaerobic selector configuration with controlled DO. This resulted in a 20% decrease in average sludge volume index (SVI), but the WWTP continued to experience periodic excursions of poor settleability. In the research described in the paper the authors compared long term data for SVI and filament population distribution to results from dynamic modeling of the process. A conclusion of the research is that while maintenance of an adequate mean cell residence time (MCRT) can control most SVI excursions by maintaining a sufficient population of phosphorus accumulating organisms (PAO) to enhance settling, peak influent loadings can cause disruption of settling by causing peaks of volatile fatty acid (VFA) in the anaerobic stage of the reactor, especially during cold weather, when the PAO are more prone to washout.

Keywords: HPO; anaerobic selector; dynamic modeling; filaments; settleability

Document Type: Research Article


Publication date: 2009-01-01

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