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Sorption and Degradation of Alachlor and Metolachlor in Ground Water Using Green Sands

^a Construction Environment Department, Korea Institute of Construction Technology, 2311, Daehwa-Dong, Iilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea
^b Department of Civil and Environmental Engineering, University of Wisconsin, 2214 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706-1691

View larger version (20K): [in a new window]   Fig. 1. Concentrations of alachlor and metolachlor from batch degradation tests conducted with green sand iron from Green Sand 11.

View larger version (20K): [in a new window]   Fig. 2. Schematic of column test apparatus.

View larger version (28K): [in a new window]   Fig. 3. (a) Typical breakthrough curves for column tests with green sands and (b) breakthrough curves for control tests conducted with Portage sand along with fits of the advection–dispersion–reaction equation (ADRE; Eq. [2]).

View larger version (30K): [in a new window]   Fig. 4. Batch sorption isotherms for alachlor: (a) Sands 1 through 5 and (b) Sands 7 through 12.

View larger version (30K): [in a new window]   Fig. 5. Batch sorption isotherms for metolachlor: (a) Sands 1 through 5 and (b) Sands 7 through 12.

View larger version (34K): [in a new window]   Fig. 6. Contours of partition coefficient (L/kg) as a function of total organic carbon (TOC) and 2-µm clay content for (a) alachlor and (b) metolachlor. Open circles represent data points. Numbers in italics next to data points are measured partition coefficients. Numbers in bold are contour intervals for the partition coefficient.

View larger version (26K): [in a new window]   Fig. 7. Bulk first-order rate constants (Kobs) for alachlor as a function of specific surface area (SSA) of iron.

View larger version (31K): [in a new window]   Fig. 8. Comparison of partition coefficients for alachlor and metolachlor from column tests and batch sorption tests.

View larger version (15K): [in a new window]   Fig. 9. Normalized rate constants (KSA) for Sand 12 and iron–Portage sand mixture during long-term testing.

View larger version (31K): [in a new window]   Fig. 10. Normalized concentration as a function of green sand iron content and barrier thickness: (a) alachlor and (b) metolachlor.