Total Phosphorous Removal with Rare Earth Technology: Real World Case Studies

Case study results for ultra-low removal of total phosphorous using rare earth chloride in three Wisconsin wastewater treatment plants will be presented. Total phosphorous influent levels as high as 6 mg/L were reduced to levels less than 0.07 mg/L in jar tests to determine the starting dosage for plant trials. The dosing estimate from the jar testing correlated well with actual plant trial results that resulted in discharge levels of less than 0.075 mg/L leaving the plant. Orthophosphate testing was utilized as a quick surrogate test to adjust feed rates during the plant trials when total phosphorus results were unavailable.