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Lability of Drinking Water Treatment Residuals (WTR) Immobilized Phosphorus

Aging and pH Effects

Soil and Water Sci. Dep., Univ. of Florida, Gainesville, Fl 32611-0510

View larger version (16K): [in this window] [in a new window]   Fig. 1. Aging effects on labile P of the Immokalee soil samples spiked with 100 mg P kg–1 and thermally incubated at 70°C for 4.5 yr. Error bars denote one standard error of the mean.

View larger version (14K): [in this window] [in a new window]   Fig. 2. pH effects on labile P of P-impacted Immokalee soil samples incubated for 4.5 yr at 70°C. Error bars denote one standard error of the mean.

View larger version (12K): [in this window] [in a new window]   Fig. 3. Effects of drinking water treatment residuals (WTR) amendment on labile P concentrations with time of Immokalee soil samples spiked with 100 mg P kg–1 and artificially aged through wet and dry cycles. Error bars denote one standard error of the mean.

View larger version (8K): [in this window] [in a new window]   Fig. 4. Effects of drinking water treatment residuals (WTR) amendment on labile P concentrations as a function of pH for the Immokalee soil samples spiked with 100 mg P kg–1 and incubated via wet and dry cycles for 2 yr. Error bars denote one standard error of the mean.

View larger version (10K): [in this window] [in a new window]   Fig. 5. Effects of drinking water treatment residuals (WTR) amendment on labile P concentrations as a function of impacted P loads for Immokalee soil samples artificially aged via wet and dry cycles for 2 yr. Error bars denote one standard error of the mean.

View larger version (11K): [in this window] [in a new window]   Fig. 6. Relationship between labile P concentrations of the drinking water treatment residuals (WTR)-amended P-impacted (100 mg kg–1) Immokalee soil samples incubated either thermally or via wetting and drying. Measurements were taken until time to apparent equilibrium.

View larger version (10K): [in this window] [in a new window]   Fig. 7. pH effects on labile P concentrations of the Michigan field-aged soil samples taken in fall 2005. Error bars denote one standard error of the mean.

View larger version (18K): [in this window] [in a new window]   Fig. 8. Aging effects on labile P concentrations of the Michigan field-aged soil samples equilibrated at (A) pH 6 and (B) pH 3. Error bars denote one standard error of the mean.