Dioxins Leaching Prediction in Selected Soils Series through Breakthrough Curves (BTCs) Model
Keywords:
Groundwater pollution, leaching potential, preferential flow, sorption, dioxins, and BTCs.Abstract
This study investigated the possibility of selected dioxins leaching and causes of groundwater
contamination. For this purpose, soil samples were taken from the KP districts of Peshawar, Charsadda, and
Swabi. Soil desorption analysis was used to assess the sorption capacity of these particular soil series.
Breakthrough Curve (BTC) plots were used to describe the transportation of solutes. The distribution
coefficient (K ), retardation factor, and dispersivity are used to determine the K values during sorption and d d
desorption. Dioxin transportation was expected to occur at two different velocities: steady or preferential
flow (50 cm day -1) and normal velocity (20 cm day -1). Regarding Dibenzo-p-Dioxin (DD), the K values for d
three series were found to be in ascending order: Charsadda > Peshawar > Sultanpur series; however, the
order for 2 Chloro-p-Dioxin (2Cl-DD) was determined to be Charsadda > Sultanpur > Peshawar. Comparing
the results with those from other studies, the total sorption was observed to be low. In contrast to high seepage
velocity, BTC graphs took comparatively longer to reach the point of saturation under the usual velocity for
both of the selected Dioxins (DD and 2Cl-DD). The investigation found that the chosen dioxins significantly
leached and had low sorption.
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