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A Rapid Sludge Activity Test for Dairy Wastes

John Palmer
Irish Journal of Food Science and Technology
Vol. 7, No. 2 (1983), pp. 105-110
Stable URL: http://www.jstor.org/stable/25558069
Page Count: 6
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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.
A Rapid Sludge Activity Test for Dairy Wastes
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Abstract

A sludge activity test based on measurement of the reduction in soluble COD occurring in an aerated mixture of sludge and various dairy waste substrates was evaluated. An incubation temperature of 15°C for 2 to 4 h or 18°C for 1 h using a chemical oxygen demand to mixed liquor suspended solids ratio of 0.11 (COD/MLSS) was sufficient to give almost complete degradation of a readily degradable substrate. Degradation of skim milk occurred more readily than that of whey, the difference depending on the aeration time and the type of sludge used. The addition of caseinate or skim milk to whey or lactose improved the amount of degradation while ammonium salts gave no improvement. Sludge from an oxidation ditch was much slower in degrading skim milk, whey and lactose than sludge from high rate bioaeration plants. The level of caustic alkalinity of the substrate affected the degradation rate.

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