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Phosphorus Retention Mechanisms of a Water Treatment Residual

^a Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523-1170
^b Department of Forest, Rangeland, and Watershed Stewardship, Colorado State University, Fort Collins, CO 80523-1170

View larger version (24K): [in a new window]   Fig. 1. The influence of shaking time on P-loaded water treatment residual (WTR) solution pH.

View larger version (27K): [in a new window]   Fig. 2. The influence of shaking time on Ca desorption from P-loaded water treatment residual (WTR).

View larger version (25K): [in a new window]   Fig. 3. The influence of shaking time on Al desorption from P-loaded water treatment residual (WTR).

View larger version (30K): [in a new window]   Fig. 4. The influence of shaking time on P desorption from P-loaded water treatment residual (WTR).

View larger version (30K): [in a new window]   Fig. 5. The influence of shaking time on P mineral solubility from P-loaded water treatment residual (WTR). Adapted from Lindsay (1979). DCP, dicalcium phosphate (CaHPO4); DCPD, dicalcium phosphate dibasic (CaHPO4·2H2O); OCP, octacalcium phosphate [Ca4H(PO4)3·2.5H2O]; TCP, tricalcium phosphate [Ca3(PO4)2].

View larger version (114K): [in a new window]   Fig. 6. Backscattered electron (BSE) image and wavelength dispersive spectroscopy dot maps of Ca, P, and Al of sample Day 1. The light-colored portions on the dot maps indicate the presence of Ca, P, or Al.

View larger version (142K): [in a new window]   Fig. 7. Backscattered electron (BSE) image and wavelength dispersive spectroscopy dot maps of Ca, P, and Al of sample Day 211. The light-colored portions on the dot maps indicate the presence of Ca, P, or Al.