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Effects of Hydrazine on the Activated Sludge Process

Jay A. Farmwald and Michael G. MacNaughton
Journal (Water Pollution Control Federation)
Vol. 53, No. 5 (May, 1981), pp. 565-575
Stable URL: http://www.jstor.org/stable/25041143
Page Count: 11
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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.
Effects of Hydrazine on the Activated Sludge Process
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Abstract

The increased procurement, storage, and transportation of hydrazine in support of the Titan and Minuteman operational missiles, the Space Shuttle, and the F-16 combat fighter programs makes it important to document the effects of fuel spills and low-level, continuous-flow discharges on publicly owned wastewater treatment works. Using 12 bench-scale continuous-flow recycle reactors, it was shown that treatment efficiency (as measured by chemical oxygen demand removal) is not seriously impaired by slug doses that increase aeration basin hydrazine concentrations up to 44 mg/l. The chemical oxygen demand recovery times for slug doses of 243 mg/l were approximately 4 to 5 days. The concentration with respect to ammonia oxidation was determined to be between 1 and 23 mg/l, whereas nitrate recovery times for doses up to 243 mg/l were approximately 10 days. Continuous influent hydrazine concentrations above 10 mg/l seriously degrade chemical oxygen demand removal capabilities. Nitrification under continuous feed conditions was inhibited above 1 mg/l.

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