Journal of Food, Agriculture and Environment
Preferential solute transport with models simulation
Author(s):
Ting Yang 1,
Beibei Zhou 1, 2*, Quanjiu Wang 1, 2*Recieved Date: 2013-08-10, Accepted Date: 2013-10-10
Abstract:Transport ions in soil with preferential path often cause serious contamination, in our study, a conservative anion (Cl-), a heavy metal ion (Cu2+) and fertilizer ions (NO3-, K+) on solute transport were studied with an undisturbed, saturated and silt loam soil column, using a series of miscible experiments. With different two pore water velocity (slow 1.47 cm/h, fast 3.34 cm/h), and the chloride transport process in the soil columns were simulated with two-region model and two-flow region model. Results indicated that: increasing pore water velocity ahead of breakthrough time, and that, pore water velocity has much more effect on anions than cations in the small pulse input; with the increase of the pore water velocity, greater asymmetry in the BTC occurred, reflecting the earlier breakthrough and greater degree of tailing; the shapes of the BTCs of the four different ions varied notably, and Cu2+ behaved differently from the anions and potassium under the same input method conditions and its relative concentration was much lower. Both small and large pulse breakthrough curves could be more accurately fitted by the two-flow region model than the two-region model.
Keywords:Breakthrough curves,
pore water velocity, solute application method, transport ions, two-region model, two-flow region modelJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2167-2173
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