fate model Articles
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Influence of global climate change on chemical fate and bioaccumulation: The role of multimedia models
Multimedia environmental fate models are valuable tools for investigating potential changes associated with global climate change, particularly because thermodynamic forcing on partitioning behavior as well as diffusive and nondiffusive exchange processes are implicitly considered. Similarly, food‐web bioaccumulation models are capable of integrating the net effect of changes associated with ...
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Understanding QSPR uncertainty in environmental fate modeling
In cases where experimental data on chemical‐specific input parameters are lacking, chemical regulations allow the use of alternatives to testing, such as in silico predictions based on quantitative structure‐property relationships (QSPRs). Such predictions are often given as point estimates; however, little is known about to what extent uncertainties associated with QSPR predictions contribute ...
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Development of an in-stream environmental exposure model for assessing down-the-drain chemicals in Southern Ontario
In order to address increased interest from scientists and regulators in quantifying environmental risks associated with release of common down-the-drain consumer products, a single-medium contaminant fate model for the lower St. Lawrence drainage basin in Southern Ontario was developed. The model was built within the pre-existing framework of the iSTREEM® in-stream environmental exposure ...
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Modelling micro-pollutant fate in wastewater collection and treatment systems: status and challenges
This paper provides a comprehensive summary on modelling of micro-pollutants' (MPs) fate and transport in wastewater. It indicates the motivations of MP modelling and summarises and illustrates the current status. Finally, some recommendations are provided to improve and diffuse the use of such models. In brief, we conclude that, in order to predict the contaminant removal in centralised ...
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Fate kinetic coefficients and correlation models for tetrabromobisphenol A (TBBPA) in membrane bioreactors and conventional activated sludge process
Tetrabromobisphenol A (TBBPA) is a fire retardant with endocrine disruption properties, which unfortunately has been detected in trace amounts in various environmental samples. Studies have shown that TBBPA enters the aquatic environment, sediments, soils and biota predominantly through the wastewater treatment process. The dominant contributor to the fate and transport of TBBPA in wastewater ...
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Combining multimedia models with integrated urban water system models for micropollutants
Integrated urban water system (IUWS) modeling aims at assessing the quality of the surface water receiving the urban emissions through sewage treatment plants, combined sewer overflows (CSOs) and stormwater drainage systems. However, some micropollutants tend to appear in more than one environmental medium (air, water, sediment, soil, groundwater, etc.). In this work, a multimedia fate and ...
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Simulating the uncertain effect of active carbon capping of a dioxin polluted Norwegian fjord
Process‐based multimedia models are frequently utilized to simulate the long‐term impacts of pollutants and to evaluate potential remediation actions that can be put in place to improve or manage polluted marine environments. Many such models are detailed enough to encapsulate the different scales and processes relevant for various contaminants, yet still are tractable enough for analysis ...
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PETROTOX: An aquatic toxicity model for petroleum substances
A spreadsheet model (PETROTOX) is described that predicts the aquatic toxicity of complex petroleum substances from petroleum substance composition. Substance composition is characterized by specifying mass fractions in constituent hydrocarbon blocks (HBs), based on available analytical information. The HBs are defined by their mass fractions within a defined carbon number range or boiling ...
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A coupled stochastic/deterministic model to estimate the evolution of the risk of water contamination by pesticides across Canada
Periodic assessments of the risk of water contamination by pesticides help decision makers to improve the sustainability of agricultural management practices. In Canada, when evaluating the risk of water contamination by pesticides, there are two main constraints. First, because the area of interest is large, a pesticide transport model with low computational running time is mandatory. Second, ...
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Good modeling practice guidelines for applying multimedia models in chemical assessments
Multimedia mass balance models of chemical fate in the environment have been used for over 3 decades in a regulatory context to assist decision making. As these models become more comprehensive, reliable, and accepted, there is a need to recognize and adopt principles of Good Modeling Practice (GMP) to ensure that multimedia models are applied with transparency and adherence to accepted ...
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Automated method for determination of dissolved organic carbon – water distribution constants of structurally diverse pollutants using pre‐equilibrium solid phase microextraction
Dissolved organic carbon (DOC) plays a key role in determining the environmental fate of semi‐volatile organic environmental contaminants. The goal of the present work was to develop a method using commercially available hardware to rapidly characterize the sorption properties of DOC in water samples. The resulting method uses negligible‐depletion direct immersion solid‐phase microextraction ...
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A method to predict and understand fish survival under dynamic chemical stress using standard ecotoxicity data
The authors present a method to predict fish survival under exposure to fluctuating concentrations and repeated pulses of a chemical stressor. The method is based on toxicokinetic‐toxicodynamic modeling using the general unified threshold model of survival (GUTS) and calibrated using raw data from standard fish acute toxicity tests. The model was validated by predicting fry survival in a fish ...
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Land use and riparian effects on prairie wetland sediment properties and herbicide sorption coefficients
Sorption of commonly used herbicides by wetland sediment can provide important information for herbicide fate modeling. The influence of sediment properties on herbicide sorption as a result of different land uses in the wetland catchment is unclear. We examined the effects of land use on the physiochemical properties of wetland sediments and the associations between these sediment properties and ...
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Modeling Mercury Fluxes and Concentrations in a Georgia Watershed Receiving Atmospheric Deposition Load from Direct and Indirect Sources
Mercury (Hg) is considered a priority pollutant because of its toxicity and potential for strong bioaccumulation.There are many serious environmental and human health concerns associated with elevated levels of Hg linked to industrial Hg emissions.2,3 Complex biological and chemical interactions, however, prolong Hg cycling between the various environmental compartments.4 The complex ...
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A risk assessment example for soil invertebrates using spatially explicit agent‐based models (ABMs)
Current risk assessment methods for measuring the toxicity of plant protection products (PPPs) on soil invertebrates use standardised laboratory conditions to determine acute effects on mortality and sublethal effects on reproduction. If an unacceptable risk is identified at the lower tier, population‐level effects are assessed using semi‐field and field trials at a higher tier because ...
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Degradation and transformation of 17α‐estradiol in water‐sediment systems under controlled aerobic and anaerobic conditions
17α‐Estradiol is one of the principal metabolites in cattle excreta following the administration of Synovex® ONE, which contains estradiol benzoate (EB) and trenbolone acetate (TBA). As part of the environmental assessment of the use of Synovex® ONE, data were generated to characterize the fate of 17α‐estradiol in the environment. Studies were conducted to determine the degradation and ...
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Incorporating site-specific analytical data and machine learning to predict environmental site conditions
EnviMetric makes intelligent predictions about the extent of groundwater contamination even when there is no available analytical data regarding contaminant concentrations. Factors such as the site location, release type, property use, and geologic setting are very predictive of how large a groundwater plume will be. EnviMetric uses all this available information to make data-based predictions ...
By Azimuth1
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Dynamic stormwater treatment unit model for micropollutants (STUMP) based on substance inherent properties
Modelling the removal of micropollutants (MPs) in stormwater treatment systems is essential in a context that is characterized by a general lack of measurements. This paper presents an innovative dynamic model for the prediction of the removal of MPs in stormwater treatment systems (Stormwater Treatment Unit model for Micro Pollutants—STUMP). The model, based on a conceptual model of ...
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Extension of the River Water Quality Model No. 1 with the fate of pesticides
The existing River Water Quality Model No. 1 (RWQM1) was extended with processes determining the fate of non-volatile pesticides in the water phase and sediments. The exchange of pesticides between the water column and the sediment is described by three transport processes: diffusion, sedimentation and resuspension. Burial of sediments is also included. The modified model was used to simulate the ...
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Sensitivity analysis for the SimpleTreat model to simulate fate of chemicals in sewage treatment plants
SimpleTreat 3.1 predicts the distribution and elimination of chemicals by sewage treatment. The model is used as the default calculation in EUSES 2.0 to estimate exposure concentration in the receiving water, soil and air. A sensitivity analysis was performed to rank input parameters according to their influence on model predictions. Triclosan was selected for the base case. The sewage flow, ...
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