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Open Access Applying Rheological Techniques to Upgrade Anaerobic Digesters and Handle High Solids Concentrations

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The Orange County Sanitation District (OCSD) is upgrading their wastewater treatment Plant No. 1 in Fountain Valley, California. To maintain the 15-day hydraulic retention time (HRT) for meeting EPA 40 CFR Part 503 for Class B biosolids without adding anaerobic digestion volume, it will be necessary to thicken the feed solids to the digesters. An engineering study was conducted to evaluate the effectiveness of the existing jet mixing loop (JML) system for digested sludge concentrations up to 6 percent dry solids (DS). Site-specific sludge rheology data were obtained and used to evaluate digester mixing first in a scale model and then in a computer model using Computational Fluid Dynamics (CFD). The results showed that the JML system would be effective if larger mixing pumps were installed and the mode of operation was modified from parallel jet operation to sequential operation of pairs of jets.


Document Type: Research Article


Publication date: 2007-04-01

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