2018
DOI: 10.1016/j.advwatres.2017.10.028
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Release of Escherichia coli under raindrop impact: The role of clay

Abstract: A recent paper by Wang et al. (2017) showed that the release of Escherichia coli (E. coli) from soil into overland flow under raindrop impact and the release of clay follow identical temporal patterns. This raised the question: what is the role of clay, if any, in E. coli transfer from soil to overland flow, e.g., does clay facilitate E. coli transfer? Using simulated rainfall experiments over soil columns with and without clay in the matrix, we found there was significantly more E. coli released from the non-… Show more

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Cited by 13 publications
(10 citation statements)
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“…As has been documented previously, E. coli concentrations were highly correlated with sediment concentrations and related variables, including total P (Gentry et al, 2006;Vidon et al, 2008). According to previous findings (Wang, 2015;Wang et al, 2017;Wang et al, 2018), one reason was that transport of E. coli and sediment can be explained by the same mechanisms, especially when stormwater dominates. The high correlation between the increase of E. coli level and the occurrence of storm and the increase of sediments (Table 5) was generally explained by surface erosion and the co-transport of E. coli both alone and bound to eroding sediments (Muirhead et al, 2006a;Oliver et al, 2005).…”
Section: Pc1mentioning
confidence: 92%
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“…As has been documented previously, E. coli concentrations were highly correlated with sediment concentrations and related variables, including total P (Gentry et al, 2006;Vidon et al, 2008). According to previous findings (Wang, 2015;Wang et al, 2017;Wang et al, 2018), one reason was that transport of E. coli and sediment can be explained by the same mechanisms, especially when stormwater dominates. The high correlation between the increase of E. coli level and the occurrence of storm and the increase of sediments (Table 5) was generally explained by surface erosion and the co-transport of E. coli both alone and bound to eroding sediments (Muirhead et al, 2006a;Oliver et al, 2005).…”
Section: Pc1mentioning
confidence: 92%
“…As E. coli was found to be eroded from the top soil (Wang, 2015;Wang et al, 2017;Wang et al, 2018) and resuspended from the bottom of the stream together with sediments (Ferguson et al, 2003;Jamieson et al, 2005), it was expected that E. coli concentrations were significantly positively correlated with PC1. As has been documented previously, E. coli concentrations were highly correlated with sediment concentrations and related variables, including total P (Gentry et al, 2006;Vidon et al, 2008).…”
Section: Pc1mentioning
confidence: 99%
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“…When it started to rain at 8:00 on each day (Fig. 8a), the impact of the raindrops might have enabled redistribution of soil and tracer particles in the top one centimeter of the soil (similar to the shield layer or mixing layer in Wang et al, 2013Wang et al, , 2017Wang et al, , 2018. As a result, tracers in the top 1 cm of soil might have been ejected and deposited into larger pores allowing them to move more deeply in the soil.…”
Section: System Wet-upmentioning
confidence: 99%
“…Particles with an effective diameter of 1 nm to 10 μm are considered colloids (Chrysikopoulos & Sim, 1996; Gao, Cao, Dong, Luo, & Ma, 2011; Sirivithayapakorn & Keller, 2003a; Smith et al, 2007; Vasiliadou & Chrysikopoulos, 2011; Wan & Wilson, 1994b; Wang, Schneider, Parlange, Dahlke, & Walter, 2018). In the subsurface environment colloids comprise many naturally occurring substances including clays, metal oxides, mineral precipitates, and organic compounds as well as biological organisms such as pathogenic bacteria (Wang et al, 2017, 2018; Wang, Schneider, et al, 2018), viruses (Torkzaban, Hassanizadeh, Schijven, Bruijn, & Husman, 2006; Torkzaban, Hassanizadeh, Schijven, & van den Berg, 2006; Zhang, Hassanizadeh, Raoof, van Genuchten, & Roels, 2012), and protozoa (Bradford, Wang, Kim, Torkzaban, & Šimůnek, 2014; Sen, 2011). Many known environmental pollutants can attach to and move with colloids, a process referred to as colloid‐facilitated transport, which has been identified as one of the most important mechanisms responsible for the mobilization of reactive heavy metals in soils (Barton & Karathanasis, 2003; Gao et al, 2011; Grolimund & Borkovec, 2005; Kretzschmar & Schafer, 2005).…”
Section: Introductionmentioning
confidence: 99%