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Transport of Di(2-ethylhexyl)phthalate (DEHP) Applied with Sewage Sludge to Undisturbed and Repacked Soil Columns

^a L.W. de Jonge, Danish Institute of Agricultural Sciences, Dep. of Crop Physiology and Soil Science, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark
^b Dep. Environmental Engineering, Aalborg University, Sohngaardsholmvej 57, DK-9000 Aalborg, Denmark

View larger version (37K): [in a new window]   Fig. 1. Schematic of the experimental column system.

View larger version (22K): [in a new window]   Fig. 2. Desorption isotherm of di(2-ethylhexyl)phthalate (DEHP) from the sludge at 20°C. The line is the fitted Freundlich isotherm.

View larger version (44K): [in a new window]   Fig. 3. Cumulative leached fraction of di(2-ethylhexyl)phthalate (DEHP) for all the performed column experiments. Treatment 1 represents the heterogeneous sludge application, Treatment 2 represents the homogeneous case. Note the different scales used for the Røgen soil.

View larger version (36K): [in a new window]   Fig. 4. Concentration of 14C di(2-ethylhexyl)phthalate (DEHP) measured in the effluent of the Askov columns. Note the delay in the concentration increase for Treatment 1, which is absent for Treatment 2.

View larger version (43K): [in a new window]   Fig. 5. Cumulative leached fraction of Br tracer for all the performed column experiments. Treatment 1 represents the heterogeneous sludge application, Treatment 2 represents the homogeneous case.

View larger version (21K): [in a new window]   Fig. 6. Turbidity, electrical conductivity, and pH in the effluent of some representative intact soil columns.

View larger version (34K): [in a new window]   Fig. 7. Cumulative leaching of di(2-ethylhexyl)phthalate (DEHP) from Røgen Columns 1a (A) and 1c (B). In Column 1a, the DEHP breakthrough is delayed, and the particle-facilitated contribution was small. In Column 1c, leaching occurred immediately after the start of the experiment, and the contribution from particle-facilitated transport is considerable.