Implications of non-equilibrium sorption on the interception-sorption trench remediation strategy

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Authors:Hitchcock, P. W.; Smith, D. W.
Author Affiliations:Primary:
University of Newcastle, Department of Civil Engineering and Surveying, Newcastle, N.S.W., Australia
Volume Title:Contaminants and the soil environment
Volume Authors:Naidu, R., editor
Source:Geoderma, 84(1-3), p.109-120; First international conference on Contaminants and the soil environment, Adelaide, South Aust., Australia, 1996, edited by R. Naidu. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0016-7061
Publication Date:1998
Note:In English. 27 refs.; illus., incl. 1 table
Summary:Design charts, based on solution of the advection-dispersion equation and assuming equilibrium sorption, have been developed to aid in interception-sorption trench design. The interception-sorption trench method is a simple, cost effective, in situ groundwater remediation technique. The procedure involves excavating a trench downflow of a polluted area and backfilling the trench with a sorbent material. The contaminant is transported through the soil along the natural groundwater gradient and over time the contaminant will be sorbed onto the material contained within the trench. The interception-sorption trench system can be used for groundwater remediation in a decontamination strategy or in a pollution-control strategy. The decontamination strategy comprises removing the trench material when all the contaminant is contained within the trench, thereby decontaminating the groundwater system. Alternatively, with the pollution-control strategy, the sorptive material remains in situ and the system is designed to reduce the postsorptive trench contaminant concentration to an environmentally acceptable level. The important implications of considering non-equilibrium sorption on trench design for both the decontamination and pollution-control strategies were studied using a linear hereditary time-dependent sorption model. For the pollution-control strategy, non-equilibrium conditions can result in underestimation of the maximum trench effluent concentration. For the decontamination strategy, non-equilibrium conditions can result in overestimation of the amount of contaminant in the trench at a given time. Abstract Copyright (1998) Elsevier, B.V.
Subjects:Controls; Decontamination; Ground water; Mathematical models; Pollutants; Pollution; Remediation; Soil treatment; Soils; Sorption; Theoretical studies; Transport; Trenching
Record ID:1998041083
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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