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SL349: Onsite Sewage Treatment and Disposal Systems: Phosphorus

Figure 1. Fate and transport of phosphate (PO43-) in a septic system. Most adsorption and precipitation reactions of phosphate are complete by the time the septic tank effluent reaches the water table. Thus, understanding how phosphate moves in the drain field is the key to determining the ultimate fate of phosphate from septic systems.

Credit: Mary Lusk, UF/IFAS.