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Phosphorus Sorbing Materials: Sorption Dynamics and Physicochemical Characteristics

^a Wor-Wic Community College, 32000 Campus Drive, Salisbury, MD 21804
^b Wetland Biogeochemistry Lab., Soil and Water Science Dep., Univ. of Florida/IFAS, 106 Newell Hall, PO BOX 110510, Gainesville, FL 32611

View larger version (10K): [in this window] [in a new window]   Fig. 1. Multi-point phosphorus sorption isotherms for eight materials showing log trend lines and their associated r2 values. Error bars represent ± one standard deviation. During the multi-point phosphorus sorption isotherm experiments we did not have Fe-DWTR, Ca-DWTR, or SuperMag materials. Dehydrated Fe-sludge was not locally available; therefore, we do not present results.

View larger version (11K): [in this window] [in a new window]   Fig. 2. Kinetic study showing phosphorus remaining in solution after various equilibration periods with seven materials. Error bars represent ± one standard deviation. The sand-masonry was eliminated as a potential candidate material due to low P-sorption capacity, therefore it was not tested further. The organic soil had too high an in situ value in natural wetlands; therefore we did not view it as a readily available by-product. The Al#2 and sandblast grit materials were not tested due to potential toxicity concerns. The dehydrated Fe-sludge was not tested, due to it not being locally available.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Inorganic phosphorus fractions of tested materials. The total mass (mg) of phosphorus per mass (kg) of material are provided above each column. The NaOH-Pi represents the inorganic P in the NaOH extracted solution. The NaOH-Po represents the amount of organic phosphorus in the NaOH extract. The inorganic phosphorus was calculated as the difference between total P and soluble reactive P in the NaOH solution.