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A Pilot-Scale Evaluation of Alum Treatments to Reduce Lake Sediment Phosphorus Release

Dep. of Civil and Environ. Eng., Clarkson Univ., Potsdam, NY 13676.

^* Corresponding author.

ABSTRACT

Presented is a simple mass-balance approach to evaluating alum inactivation of sediment-bound phosphorus (P) using continuous-flow reactors and aerobic sediments from a eutrophic luke (Black Lake, NY). The method permitted tests of treatment effects on the rate and duration of sediment P release, was simple to interpret, statistically reliable, and could be applied to other eutrophic systems. Analyzed as a zero-order process, sediment P release rate decreased linearly as a function of alum dose, and the maximum dose tested (equivalent to 1.22 g Al m^–2) halved the zero-order P release rate for four hydraulic retention periods.

Contribution from the Dep. of Civil and Environ. Eng., Clarkson Univ.

Financial support provided by New York State Dep. of Environ. Conserv. and facilities provided by the St. Lawrence County Environ. Manage. Council is gratefully acknowledged.

Received for publication November 12, 1987.