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Alkaline Stabilization of Freshwater Sediments

Alkaline Stabilization of Freshwater Sediments PDF Author: Amy Polaczyk
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The sediment to a pH of 12 and maintain for 2 hours. The US EPA asserts that this method is at least 99% effective at reducing organisms in biosolids. The goal of this study was to determine if the use of alkaline stabilization reduces the amount of microorganisms in sediments obtained from a freshwater stream. Measurements of heterotrophic bacteria, total fungi, Bacillus cereus, Escherichia coli, and total coliforms were used to assess the effectiveness of alkaline stabilization of sediments. It was determined that the amount of microorganisms in the sediment after treatment with hydrated lime and lime kiln dust was reduced, but the decrease was not 99% for all the indicator organisms as predicted by the US EPA guidance for biosolids. Heterotrophs, E. coli, and total coliforms were reduced by greater than 99%, but fungi were only reduced 86.5% and the opportunistic pathogen Bacillus cereus was only reduced by 75%.