A screening model for effects of land-disposed wastes on groundwater quality

Ünlü, Kahraman; Kemblowski, M. W.; Parker, J. C.; Stevens, David King; Chong, Peng; Kamil, Idris Maxdoni

doi:10.1016/0169-7722(92)90032-a

Cited by 22 publications

(6 citation statements)

References 12 publications

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“…Model VI was first implemented in the risk assessment software RISC 4 [47], then upgraded to the newer version RISC 5 , which incorporates the approach developed in [60]. In this model, the source depletes with time due to the simultaneous effect of leaching and volatilization of VOCs.…”

Section: Model VImentioning

confidence: 99%

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

et al. 2020

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Analytical models for the simulation of contaminants’ fate and transport in the unsaturated zone are used in many engineering applications concerning groundwater resource management and risk assessment. As a consequence, several scientific studies dealing with the development and application of analytical solutions have been carried out. Six models have been selected and compared based on common characteristics to identify pros and cons as well as to highlight any difference in the final output. The analyzed models have been clustered into three groups according to the assumptions on contaminant source and physico-chemical mechanisms occurring during the transport. Comparative simulations were carried out with five target contaminants (Benzene, Benzo(a)pyrene, Vinyl Chloride, Trichloroethylene and Aldrin) with different decay’s coefficient, three types of soil (sand, loam and clay) and three different thicknesses of the contaminant source. The calculated concentration at a given depth in the soil for the same contamination scenario varied greatly among the models. A significant variability of the concentrations was shown due to the variation of contaminant and soil characteristics. As a general finding, the more advanced is the model, the lower the predicted concentrations; thus, models that are too simplified could lead to outcomes of some orders of magnitude greater than the advanced one.

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Section: Model VImentioning

confidence: 99%

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

et al. 2020

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“…The pesticide model developed in series of papers by Jury (4–7) was modified for application in vapor intrusion, such as by Vlier-Humaan, while another two pesticide models (70, 90) were also applied in RISC. Anderssen et al (75), made a modification of these models to remove two shortcomings related to limited initial conditions and homogenous surface boundary conditions.…”

Section: Transport Models Involving Biodegradationmentioning

confidence: 99%

A Review of Vapor Intrusion Models

Yao

Shen

Pennell

et al. 2013

Environ. Sci. Technol.

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A complete vapor intrusion (VI) model, describing vapor entry of volatile organic chemicals (VOCs) into buildings located on contaminated sites, generally consists of two main parts-one describing vapor transport in the soil and the other its entry into the building. Modeling the soil vapor transport part involves either analytically or numerically solving the equations of vapor advection and diffusion in the subsurface. Contaminant biodegradation must often also be included in this simulation, and can increase the difficulty of obtaining a solution, especially when explicitly considering coupled oxygen transport and consumption. The models of contaminant building entry pathway are often coupled to calculations of indoor air contaminant concentration, and both are influenced by building construction and operational features. The description of entry pathway involves consideration of building foundation characteristics, while calculation of indoor air contaminant levels requires characterization of building enclosed space and air exchange within this. This review summarizes existing VI models, and discusses the limits of current screening tools commonly used in this field.

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“…Depletion of the hydrocarbon in the waste-mixing zone over time is assumed to occur due to combined effects of leaching of soluble components by water percolating through the waste zone, to diffusive losses from the soil surface for volatile components, and to biodegradation losses for biodegradable components (Ünlü et al 1992;Ünlü & Demirekler 2000). The aqueous loss is assumed to be purely adjective and given by J kw = -q w C kw [11] where J kw is the mass flux of species k in the water phase, [M/L 2 T]; q w is the vertical water flux, [L 3 /L 2 T].…”

Section: Waste Mixing Zone Submodelmentioning

confidence: 99%

“…In the literature, a large number of mathematical models have been reported about the transport of organic contaminants in the subsurface environment in conjunction with land-disposal of hazardous wastes and hydrocarbon spills (e.g. Jury et al 1983 and1990;Corapcioglu & Baehr 1987;Rifai et al 1988;Ünlü et al 1992;Hatfield & Stauffer 1993;Kool et al 1994;and Ünlü & Demirekler 2000). However, specific modelling studies on land treatment have been somewhat rare.…”

Section: Introductionmentioning

confidence: 99%

A model for optimal operation of land-treatment sites for oily wastes

Ünlü

Kıvanç

2001

Waste Manag Res

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Land treatment as a disposal technology has been extensively used for the disposal of oily wastes. Effective management of land treatment sites require optimal operation of the system in order to achieve the fastest and most complete degradation of petroleum hydrocarbons without contamination of the environment. This paper describes a model that can be used for optimising the operation of land treatment sites for oily wastes. The model is composed of system simulator and optimisation submodels. Conceptually, the system simulation submodel is composed of a waste mixing zone, lower treatment zone and aquifer modules. The system simulation model allows for periodic waste applications and determines the spatial and temporal variation of the state variables such as phase summed (total) and aqueous phase contaminant concentrations and water content in the system. The optimisation submodel coupled with the system simulator determines the optimal values of system control variables, such as waste loading rate, infiltration rate, water content, frequency of waste application and the dimensions of the land treatment site. Optimisation of these system control variables is accomplished by maximising the hydrocarbon mass removal from the waste mixing zone under the constraint of satisfying a prespecified water quality criteria in the aquifer. Selected model applications are presented to demonstrate the applicability and utility of the model. Such model applications include determination of the optimal operating conditions for the land treatment of oily wastes under various different site and soil environmental conditions and practical waste disposal scenarios.

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A screening model for effects of land-disposed wastes on groundwater quality

Cited by 22 publications

References 12 publications

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

A Review of Vapor Intrusion Models

A model for optimal operation of land-treatment sites for oily wastes

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