Understanding the relationship between heavy metals in road-deposited sediments and washoff particles in urban stormwater using simulated rainfall

Zhao, Hongtao; Li, Xuyong

doi:10.1016/j.jhazmat.2012.12.035

Cited by 91 publications

(29 citation statements)

References 36 publications

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“…In past studies, Zhao and Li [6] reported that rainfall intensity and duration affected pollutants in the wash-off process, but did not affect particle size composition in washed-off pollutants. Lee et al [7] analyzed hydrographs and pollutographs, indicating that transportation for most of the pollutants depended on the preceding dry period and rainfall intensity.…”

Section: Introductionmentioning

confidence: 97%

An Investigation of the Relationships between Rainfall Conditions and Pollutant Wash-Off from the Paved Road

Yuan

Guerra

Kim

2017

Water

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Stormwater runoff monitoring was carried out from 2011 to 2015 to investigate the relationships between rainfall conditions (antecedent dry days (ADDs), rainfall intensity, depth and duration), and water quality parameters of stormwater from a paved road in Korea. Factor analysis suggested that the effect of rainfall conditions on the concentrations of selected pollutants varied depending on the pollutant. As total COD (total chemical oxygen demand) concentration increased, the level of heavy metals increased and resulted in a decrease of BOD 5 (biochemical oxygen demand) because of their toxicity. In addition, ADDs had a significant impact on the wash-off of solids from paved road. The predominant particles in stormwater were 30 µm and smaller, and increased in concentration as ADDs increased. Thus, the initial load of accumulated particles became a major factor in the wash-off process. The mass of particle-related pollutants was also subject to the effect of ADDs due to the affinity between pollutants and predominant particles (<30 µm). However, the effect of ADDs on the mass of organic matter and nitrogen was relatively weak. ADDs contributed to the decrease of some pollutants by photo-oxidation, volatilization and natural decay over dry days, as well as desorption from solids during rainfall.

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Section: Introductionmentioning

confidence: 97%

An Investigation of the Relationships between Rainfall Conditions and Pollutant Wash-Off from the Paved Road

Yuan

Guerra

Kim

2017

Water

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“…Notably, the current knowledge about the pollutant wash-off process does not extend to a clear understanding about the variability (load and composition) associated with the process (Egodawatta and Goonetilleke, 2008;Hossain et al, 2011;Vaze and Chiew, 2003;Zhao and Li, 2013). Consequently, significant issues emerge in relation to the formulation of robust strategies for the mitigation of urban water pollution as poor characterisation of process variability in urban …”

Section: Introductionmentioning

confidence: 99%

Influence of pollutant build-up on variability in wash-off from urban road surfaces

Wijesiri

Egodawatta

McGree

et al. 2015

Science of The Total Environment

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Variability in the pollutant wash-off process is a concept which needs to be understood in-depth in order to better assess the outcomes of stormwater quality models, and thereby strengthen stormwater pollution mitigation strategies. Current knowledge about the wash-off process does not extend to a clear understanding of the influence of the initially available pollutant build-up on the variability of the pollutant wash-off load and composition. Consequently, pollutant wash-off process variability is poorly characterised in stormwater quality models, which can result in inaccurate stormwater quality predictions. Mathematical simulation of particulate wash-off from three urban road surfaces confirmed that the wash-off load of particle size fractions < 150 μm and > 150 μm after a storm event vary with the build-up of the respective particle size fractions available at the beginning of the storm event. Furthermore, pollutant load and composition associated with the initially available build-up of < 150 μm particles predominantly influence the variability in washed-off pollutant load and composition. The influence of the build-up of pollutants associated with > 150 μm particles on wash-off process variability is significant only for relatively shorter duration storm events.

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“…The series of units UCA, CSA, RTA, RVA and UVA has the urban-rural gradient feature with gradient variation of several important characteristics of different administrative divisions, such as population density, average daily traffic, total energy consumption, street cleaning method and frequency. In general, population density, traffic density, energy consumption, and frequency of sweeping decreased along the urban-rural gradient, as shown in Table 1 (Zhao and Li, 2013). Additionally, UCA and CSA have relatively smooth and less damaged impervious surfaces, and regularly daily mechanical sweeping; RTA, RVA and UVA have heavily damaged imperious surfaces, and rarely street sweeping.…”

Section: Study Area and Road Dust Samplingmentioning

confidence: 95%

An index for estimating the potential metal pollution contribution to atmospheric particulate matter from road dust in Beijing

Zhao

Shao

Yin

et al. 2016

Science of The Total Environment

Self Cite

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• An innovative road dust index was developed.• Road dust characteristics were ranked and weighted in the index model.• Source and transport factors were both considered in the index model. The resuspension of road dust from street surfaces could be a big contributor to atmospheric particulate pollution in the rapid urbanization context in the world. However, to date what its potential contribution to the spatial pattern is little known. Here we developed an innovative index model called the road dust index (RI b105 μm ) and it combines source and transport factors for road dust particles b 105 μm in diameter. It could quantify and differentiate the impact of the spatial distribution of the potential risks posed by metals associated with road dust on atmospheric suspended particles. The factors were ranked and weighted based on road dust characteristics (the amounts, grain sizes, and mobilities of the road dust, and the concentrations and toxicities of metals in the road dust). We then applied the RI b105 μm in the Beijing region to assess the spatial distribution of the potential risks posed by metals associated with road dust on atmospheric suspended particles. The results demonstrated that the road dust in urban areas has higher potential risk of metal to atmospheric particles than that in rural areas. The RI b105 μm method offers a new and useful tool for assessing the potential risks posed by metals associated with road dust on atmospheric suspended particles and for controlling atmospheric particulate pollution caused by road dust emissions.

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Understanding the relationship between heavy metals in road-deposited sediments and washoff particles in urban stormwater using simulated rainfall

Cited by 91 publications

References 36 publications

An Investigation of the Relationships between Rainfall Conditions and Pollutant Wash-Off from the Paved Road

An Investigation of the Relationships between Rainfall Conditions and Pollutant Wash-Off from the Paved Road

Influence of pollutant build-up on variability in wash-off from urban road surfaces

An index for estimating the potential metal pollution contribution to atmospheric particulate matter from road dust in Beijing

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