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