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The goal of this project was to develop a system that identified magnesium demand for struvite formation by monitoring conductivity changes during continuous injection of magnesium chloride in several different manure slurries. The conductivity of six manure slurries was monitored to identify the response due to magnesium chloride injection and struvite precipitation. Struvite precipitation is a technically feasible treatment method for phosphorus removal and recovery from manure slurries (Bowers and Westerman, 2005a; Burns et al., 2000). Swine manure slurries typically require the addition of magnesium (Mg) to force struvite precipitation. The quantity of Mg required for maximized phosphorus removal is generally determined through laboratory tests. Optimized struvite precipitation in a field setting would require a real-time method to determine Mg addition rates for the duration of a land application event. This paper will discuss the requirements of a feasible automated control system which monitors and controls the injection of Mg to force struvite precipitation, accounting for real-time variations of magnesium demand. Theoretical predictions and pure solution tests provided information capable of determining the magnesium demand for struvite precipitations. After testing six different manures in

Concentration and Extraction of Phosphorous from Swine Manure Slurries (as Struvite)