You are here:
FULL-SCALE DEMONSTRATION OF OPEN TANK OXYGEN ACTIVATED SLUDGE TREATMENT
Citation:
Pearlman, S. AND D. Fullerton. FULL-SCALE DEMONSTRATION OF OPEN TANK OXYGEN ACTIVATED SLUDGE TREATMENT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-79/012 (NTIS PB296904), 1979.
Description:
This report presents an operating summary of a full-scale demonstration of the FMC open tank pure oxygen (FMC O2) activated sludge system, conducted at the facilities of the Metropolitan Denver Sewage Disposal District No. 1 (Metro) in Denver, Colorado. The system was operated over a period of 15 mo at both steady state and diurnal flow rates ranging from 22,700 cu m/day (6 mgd) to 53,000 cu m/day (14 mgd), with average F/M loadings varying between 0.49 and 1.14 kg BOD/day/kg MLVSS and clarifier overflow rates ranging from 16.5 to 32.2 cu m/day/sq m (406 to 791 gpd/sq ft). The overall performance of the system was dictated in large part by the quantity of filamentous organisms in the activated sludge, and the investigation of these organisms, with attempts to control or eliminate them, was an ongoing activity during much of the demonstration. The system was evaluated as to oxygen transfer efficiency and oxygen consumption. Further, it was compared to the Metro diffused air system running in parallel with the demonstration system on the basis of sludge production and power requirements. Comparison of sludge settleabilities was made between these two systems and a closed tank pure oxygen system (UNOX) also in operation at Metro. In addition to allowing an evaluation of the FMC O2 system as a whole, the demonstration provided an opportunity to evaluate various component equipment items as to their reliability and performance.