Journal ArticleDOI
Numerical modelling on fate and transport of coupled adsorption and biodegradation of pesticides in an unsaturated porous medium
TLDR
In this article, a one-dimensional numerical model is developed to simulate the transport of pesticides in an unsaturated porous medium, considering the effect of adsorption and microbial degradation with inhibition in addition to conventional advective and dispersive transport.Abstract:
The vertical transport of pesticides from a surface application through an unsaturated porous medium system is of major concern to assess the vulnerability of groundwater contamination. In order to better understand the transport of pesticides in the groundwater, it is essential to understand the flow and predict the pesticide concentration in the unsaturated zone. A one-dimensional numerical model is developed to simulate the transport of pesticides in an unsaturated porous medium, considering the effect of adsorption and microbial degradation with inhibition in addition to conventional advective and dispersive transport. The effect of unsaturated soil parameters on the water flow dynamics and the factors governing the pesticide transport in an unsaturated porous medium is also numerically investigated. The numerical results suggest that the adsorption and biodegradation is an important sink in contaminant removal. In addition, the microbial growth inhibition due to pesticide restricts the potent...read more
Citations
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Journal ArticleDOI
Soil organic amendments: impacts on sorption of organophosphate pesticides on an alluvial soil
TL;DR: In this article, the authors evaluated the influence of OAs, mixed waste compost, and dried goat organic manure on the sorption of organophosphates, dichlorvos, and chlorpyrifos.
Journal ArticleDOI
Biodegradation kinetics of dichlorvos and chlorpyrifos by enriched bacterial cultures from an agricultural soil
TL;DR: The results indicated that the enriched microbes are promising candidates for insitu bioremediation of contaminated waters and soils.
Journal ArticleDOI
Enhanced biodegradation of atrazine at high infiltration rates in agricultural soils
TL;DR: Under future climate change scenarios, where more intense precipitation is likely to result in higher infiltration rates and increased soil moisture, the potential for groundwater pollution from atrazine may be reduced, especially in areas with a long history ofAtrazine application to soil.
Journal ArticleDOI
Understanding nitrogen and carbon biogeotransformations and transport dynamics in saturated soil columns
TL;DR: In this paper, a coupled sorption-biodegradation sink term including advanced biokinetics and inhibition effect for nitrogen movement in saturated soil was proposed for better prediction of the existing advection-dispersion-reactive transport model by a coupled SBS.
Journal ArticleDOI
Numerical investigations on pesticide fate and transport in an unsaturated porous medium for a coupled water and pesticide management
TL;DR: In this article, a simulation study is conducted based on the one-dimensional numerical model considering Richard's equation for unsaturated water flow and solute transport which takes into account the effect of both adsorption and biodegradation with inhibitory effect to understand pesticide transport in an unsaturated porous medium.
References
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Journal Article
Fate and Transport of Organics in Soil: Model Predictions and Experimental Results
TL;DR: In this paper, the Vadose Zone Interactive Processes (VIP) mathematical model was used to predict the fate and be havior of polynuclear aromatic hydrocarbon (PNA) compounds as a function of time and soil depth.
Journal ArticleDOI
Numerical modelling on fate and transport of petroleum hydrocarbons in an unsaturated subsurface system for varying source scenario
TL;DR: In this article, a one dimensional numerical model is developed to simulate the transport of benzene in an unsaturated subsurface system considering the effect of volatilization, dissolution, adsorption and microbial degradation of the benzene for (i) constant continuous source, (ii) continuous decaying source and (iii) residual source.
Journal ArticleDOI
Experimental monitoring and numerical study of pesticide (carbofuran) transfer in an agricultural soil at a field site
TL;DR: In this paper, the authors studied the transport of a pesticide at field scale, namely carbofuran molecule, which is known for its high mobility, especially in sandy soils with high hydraulic conductivity and low organic matter.
Journal ArticleDOI
Effect of concentration gradients on biodegradation in bench-scale sand columns with HYDRUS modeling of hydrocarbon transport and degradation.
TL;DR: While absolute hydrocarbon degradation increased, mineralization percentages decreased with increasing fuel concentration which was corroborated by saturation kinetics; the absolute CO2 production reached a steady plateau value at high substrate concentrations.
Journal ArticleDOI
The Cosolvation Transport of DDT and Toxaphene in Xylene at a Pesticide Formulation Facility
TL;DR: In this article, the authors examined the mechanisms capable of transporting these compounds, including colloidal transport, transport via preferential pathways, mechanical transport, and transportation by a solvent or solvent mixture.
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