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Deriving Boron Adsorption Isotherms from Soil Column Displacement Experiments

^a Institute of Soil, Water and Environmental Sciences, the Volcani Center, Agricultural Research Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel
^b Dep. of Environmental Engineering, Chinese Agricultural Univ., Beijing, 100083, China

View larger version (33K): [in a new window]   Fig. 1. (a) Boron adsorption isotherms and (b) Langmuir plots of data at different pH.

View larger version (21K): [in a new window]   Fig. 2. Measured and fitted breakthrough curves for Br in columns: 1, Series-A; 2, Series-B; and 3, Series-C. Measured data-symbol and result of fitting-solid line.

View larger version (30K): [in a new window]   Fig. 3. Measured, predicted and fitted breakthrough curves for B adsorption and desorption on columns Series-A for the input B concentration (a) 5 mg L–1 and (b) 1 mg L–1. Predictions were made using the batch-measured isotherm parameters, bm = 17.24 mg kg–1, k = 0.0549 L mg–1, and Pe = 21.

View larger version (19K): [in a new window]   Fig. 4. Hysteretic B adsorption and desorption isotherms obtained from columns Series-A. 1, adsorption isotherm; 2, desorption isotherm at the input B concentration of 5 mg L–1; 3, desorption isotherm at the input B concentration of 1 mg L–1.

View larger version (25K): [in a new window]   Fig. 5. Measured and fitted breakthrough curves for B adsorption and desorption on columns Series-B for the input B concentration (a) 5 mg L–1 and (b) 1 mg L–1. Simulations were made using Pe = 41. Best fitted isotherm parameters, bm and k, are given in Table 4 (B1 and B2).

View larger version (24K): [in a new window]   Fig. 6. Measured and predicted breakthrough curves for the transport of B in column Series-B simulated under pulse injection conditions. Observed data points were taken from Fig. 5a (solid circles), and from Fig. 5b (open circles). Predictions were made using Pe = 41, and average values for the isotherm parameters bm = 15.10 mg kg–1 and k = 0.061 L mg–1 of Table 4. A pulse durations T· = 4.31 and T· = 5.8 were used to simulate the input B concentrations of 5 mg L–1 and 1 mg L–1, respectively.

View larger version (23K): [in a new window]   Fig. 7. Measured and fitted breakthrough curves for the transport of the B species in columns Series-C. Simulations were made using Pe = 26 and T· = 0.85. Best fitted isotherm parameters, bm and k, are given in Table 4 (C1, C2, and C3).

View larger version (20K): [in a new window]   Fig. 8. The apparent adsorption coefficient k as a function of pH.