Advancements in Alum Dosing for Nutrient Management in Lakes

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Advancements in Alum Dosing for Nutrient Management in Lakes

In the southern half of Minnesota, there are almost 500 lakes currently impaired for excess nutrients and many more remain unassessed. Based on Wenck’s experience developing Total Maximum Daily Loads for almost 100 of the impaired lakes, sediment phosphorus release is an important source of nutrients in the majority of these lakes. Wenck partnered with the University of Wisconsin-Stout to develop state of the art approaches for managing internal phosphorus loading in lakes. One of the primary approaches is the application of aluminum sulfate (alum) to prevent the release of phosphorus from lake sediments. We recently published an article titled, Relationships between redox-sensitive phosphorus concentrations in sediment and the aluminum: phosphorus binding ratio showcasing some of the results of our efforts in Minnesota and Wisconsin that demonstrate the importance of sediment analysis and jar testing when considering an alum treatment.  Thank you to all of our partners who supported our efforts and contributed to the advancements in alum dosing.

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Joe Bischoff

Wenck Author

Joe Bischoff

Aquatic Ecologist/Principal
In the southern half of Minnesota, there are almost 500 lakes currently impaired for excess nutrients and many more remain unassessed.