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Causes and Control of Nocardia in Activated Sludge

Paul Pitt and David Jenkins
Research Journal of the Water Pollution Control Federation
Vol. 62, No. 2 (Mar. - Apr., 1990), pp. 143-150
Stable URL: http://www.jstor.org/stable/25043810
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Causes and Control of Nocardia in Activated Sludge
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Abstract

Nocardia foaming is a serious problem in activated sludge affecting 66% of surveyed U. S. activated sludge plants. The main strategy for Nocardia control was MCRT reduction to under 6 days. A counting technique to assess Nocardia levels in activated sludge was developed. Bench-scale experiments showed that Nocardia amarae growth was both MCRT and temperature dependent. Bench-scale anaerobic selector experiments were successful in reducing Nocardia levels in one of four tests. Full-scale anaerobic selector experiments at the city and county of San Francisco Southeast plant showed reduced Nocardia levels in an anaerobic selector system compared to a control system.

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