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 ArticleDOI
A Generalized Solution to Infiltration
TL;DR: In this article, a generalized solution to the Richardson's equation for water infiltration is developed for a variety of soils and for varying initial water contents, expressed in terms of dimensionless time, depth, and water content.
Journal ArticleDOI
Transport and degradation of propyleneglycol and potassium acetate in the unsaturated zone.
TL;DR: Computer simulations of transport and degradation in a heterogeneous unsaturated soil showed that decreasing degradation constants with depth can generate a downward movement of the centre of mass without any flow occurring in the system.
Journal ArticleDOI
Perchlorate biodegradation in contaminated soils and the deep unsaturated zone
TL;DR: In this paper, the effect of various concentrations of nitrate on perchlorate reduction was analyzed and determined whether perchlorates concentrations in the profile are toxic to the native microbial population.
Journal ArticleDOI
Variably saturated modeling of transient drainage: sensitivity to soil properties
TL;DR: In this paper, a variably saturated flow model was used to investigate the effects of independent variations in the saturated hydraulic conductivity and the two Van Genuchten parameters, and the relationship between these descriptive soil parameters, which may be used to describe the pore-size-density function of a porous medium, was surmised based upon limited empirical evidence.
Journal ArticleDOI
Persistent organochlorine pesticides and polychlorinated biphenyls in intensive agricultural soils from North India
Bhupander Kumar,S. Kumar,R. K. Gaur,Gunjan Goel,Meenu Mishra,S.K. Singh,Dev Prakash,C.S. Sharma +7 more
TL;DR: The average concentration of OCPs was 37.67 ± 0.33 ng/g (dry weight − DW) while HCHs alone accounted for 93% followed by DDT (4.27%), and endosulphan (2.51%).
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