Pesticide washoff from concrete surfaces: Literature review and a new modeling approach

Luo, Yuzhou; Spurlock, Frank; Jorgenson, Brant C.; Young, Thomas M.; Gan, Jay; Gill, Sheryl; Goh, Kean S.

doi:10.1016/j.watres.2013.03.032

Cited by 17 publications

(15 citation statements)

References 27 publications

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“…This is not consistent with recent washoff experiments on insecticides where a significant relationship between rainfall intensity and washoff loads were confirmed (3,4). Therefore, an urban scenario for the semi-mechanistic model is suggested to be developed for regulation evaluation according to the local conditions such as representative weather conditions (intensity, duration and frequency of rainfall) and impervious surface properties (19,20). The scenarios could also serve as guidelines for the washoff experiments and model calibrations to determine the required model input parameters.…”

Section: Summary and Suggestionsmentioning

confidence: 56%

“…Model parameters were calibrated based on experimental data from the first rainfall events, and validated with data with a longer set time. Calibrated models and their performance in predicting pesticide washoff from impervious surfaces were documented in the previous studies (19,20). Modeling results for selected pesticides are demonstrated in Figure 4.…”

Section: Model Equations and Evaluationmentioning

confidence: 76%

“…Two time systems are presented in Figure 1: t d accounts for the duration of the dry period since the last pesticide application, and t describes the washing time. Published washoff experiments for pesticides from impervious surfaces have been reviewed previously (19,20). According to measure washoff loads, M W (T), usually only a small portion of applied mass could be detected in the runoff, even with a short set time, suggesting a rapid initial dissipation.…”

Section: Characterization Of Pesticide Washoffmentioning

confidence: 99%

“…Detailed information on model development and applications were documented in the previous publications (19,20). This review highlights the key equations and features in the model.…”

Section: Model Equations and Evaluationmentioning

confidence: 99%

“…Determination of effective partitioning coefficients for pesticides on impervious surfaces is suggested for future studies. The semi-mechanistic model has been shown to reproduce pesticide washoff profiles for a range of set times and for repeated runoff events with a single calibration (19,20). The model is being incorporated into hydrological simulators of overland flow for pesticide risk assessments at urban community scale.…”

Section: Summary and Suggestionsmentioning

confidence: 99%

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Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Luo

2014

ACS Symposium Series

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Pesticide uses on impervious surfaces and subsequent offsite transport significantly contribute to pesticide detection and aquatic toxicity in urban watersheds. This review evaluates the various methods that currently exist to model pesticide washoff from impervious surfaces. Empirical equations successfully describe pesticide washoff by calibration to a single rainfall event, but lack consistent parameterization with varying set time and repeated rainfall. Partitioning coefficients determined from experimental data could significantly improve PRZM capability in predicting pesticide washoff from impervious surfaces. Highlighted in this review is a new semi-mechanistic approach which incorporates the time-dependence of washoff potential during the dry period after application and washoff dynamics during a runoff event. This review aims to provide information to guide model selection and model development for pesticide registration, regulation, and mitigation for urban pesticide uses. IntroductionPesticide transport in urban watersheds is a function of stormwater hydrology, various processes that control transport in watercourses, and the dynamics of pesticide release and washoff from treated surfaces. While stormwater modeling and pesticide transport in runoff have been extensively investigated, relatively few studies have evaluated pesticide washoff from urban landscapes, especially from impervious surfaces. Impervious surfaces are primary sources of overland flow generation in the urban environment. Impervious surfaces are often directly treated with pesticides in structural pest control applications, paved area applications, and incidental overspray or drift (1, 2). Previous studies suggest that impervious surfaces are the dominant contributors to pesticide movement off-site in urban areas (3-5). Compared to other surfaces such as turf and bare soils, limited knowledge is available on the dynamics of pesticide buildup and washoff on impervious surfaces. The California Department of Pesticide Regulation (CDPR) recently adopted new regulations to protect water quality in urban areas by restricting pyrethroid application amounts and certain contact areas (6). Thus, there is an emerging research need for improved washoff modeling capabilities to evaluate the effectiveness of the regulations and extrapolate the effect of mitigation practices to different conditions.The physical processes and modeling approaches of urban pollutant washoff and runoff have been reviewed in previous studies (7-13). Most of the reviews focus on pesticide transport in overland flow, concentrated flow and/or pipe flow over urban landscapes. This chapter reviews existing modeling approaches for simulating pesticide washoff from impervious surfaces, and introduces a semi-mechanistic model developed based on washoff experiments data. The models discussed here are classified as empirical or mechanistic (or semi-mechanistic) approaches. The empirical models are based on statistical analysis and data fitting and do not explicitly simulate mass t...

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Section: Summary and Suggestionsmentioning

confidence: 56%

Section: Model Equations and Evaluationmentioning

confidence: 76%

Section: Characterization Of Pesticide Washoffmentioning

confidence: 99%

“…Detailed information on model development and applications were documented in the previous publications (19,20). This review highlights the key equations and features in the model.…”

Section: Model Equations and Evaluationmentioning

confidence: 99%

Section: Summary and Suggestionsmentioning

confidence: 99%

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Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Luo

2014

ACS Symposium Series

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Photocatalytic degradation and reactor modeling of 17α-ethynylestradiol employing titanium dioxide-incorporated foam concrete

Wang

Zhang

et al. 2014

Environ Sci Pollut Res

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Photocatalytic degradation of 17α-ethynylestradiol (EE2) using TiO2 photocatalysts incorporated with foam concrete (TiO2/FC) was investigated for the first time. Scanning electron microscopy (SEM) study of the samples revealed a narrow air void size distribution on the surface of FC cubes on with 5 wt% addition of P25 TiO2, and TiO2 particles were distributed heterogeneously on the surface of TiO2/FC samples. The sorption and photocatalytic degradation of EE2 with UV-light irradiation by TiO2/FC cubes were investigated. Adsorption capacity of EE2 by the TiO2/FC and blank foam concrete (FC) samples were similar, while the degradation rates showed a great difference. More than 50 % of EE2 was removed by TiO2/FC within 3.5 h, compared with 5 % by blank FC. The EE2 removal process was then studied in a photoreactor modified from ultraviolet disinfection pool and constructed with TiO2/FC materials. An integrated model including a plate adsorption-scattering model and a modified flow diffusion model was established to simulate the photocatalytic degradation process with different radiation fields, contaminant load, and flow velocity. A satisfactory agreement was observed between the model simulations and experimental results, showing a potential for the design and scale-up of the modified photocatalytic reactor.

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Biocide emissions from building materials during wet weather: identification of substances, mechanism of release and transfer to the aquatic environment

Paijens

Bressy

Frère

et al. 2019

Environ Sci Pollut Res

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Biocides are added to or applied on building materials to prevent microorganisms from growing on their surface or to treat them. They are leached into building runoff and contribute to diffuse contamination of receiving waters. This review aimed at summarizing the current state of knowledge concerning the impact of biocides from buildings on the aquatic environment. The objectives were (i) to assess the key parameters influencing the leaching of biocides and to quantify their emission from buildings; (ii) to determine the different pathways from urban sources into receiving waters; and (iii) to assess the associated environmental risk. Based on consumption data and leaching studies, a list of substances to monitor in receiving water was established. Literature review of their concentrations in the urban water cycle showed evidences of contamination and risk for aquatic life, which should put them into consideration for inclusion to European or international monitoring programs. However, some biocide concentration data in urban and receiving waters is still missing to fully assess their environmental risk, especially for isothiazolinones, iodopropynyl carbamate, zinc pyrithione and quaternary ammonium compounds, and little is known about their transformation products. Although some models supported by actual data were developed to extrapolate emissions on larger scales (watershed or city scales), they are not sufficient to prioritize the pathways of biocides from urban sources into receiving waters during both dry and wet weathers. Our review highlights the need to reduce emissions and limit their transfer into rivers, and reports several solutions to address these issues.

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Pesticide washoff from concrete surfaces: Literature review and a new modeling approach

Cited by 17 publications

References 27 publications

Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Photocatalytic degradation and reactor modeling of 17α-ethynylestradiol employing titanium dioxide-incorporated foam concrete

Biocide emissions from building materials during wet weather: identification of substances, mechanism of release and transfer to the aquatic environment

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