A Pilot-Scale Evaluation of Alum Treatments to Reduce Lake Sediment Phosphorus Release
- Thomas C. Young *,
- Anthony G. Collins and
- Robert A. Armstrong
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.
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