Nutrient Retention Performance of Advanced Bioretention Systems Results from Three Years of Mesocosm Studies

Lucas, William C.; Greenway, Margaret

doi:10.1061/9780784413883.006

Cited by 1 publication

(1 citation statement)

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“…The limited available data on manure-borne contaminants continue to imply that existing phosphorus transport models fail to predict manure-borne E. coli transport and deposition into surface water bodies (Kruger et al 2007; Guber et al 2011; Hurley and Forman 2011; Fletcher et al 2013; Liu and Davis 2014; Tian et al 2014; Lucas and Greenway 2015). As a result, understanding of transport phenomena for manure-borne contaminants must be enhanced, while simultaneously searching for methods by which to reduce loading of contaminants into surface water bodies.…”

Section: Introductionmentioning

confidence: 99%

Effect of vegetated filter strips on transport and deposition rates of Escherichia coli in overland flow in the eastern escarpments of the Mau Forest, Njoro River Watershed, Kenya

Olilo

Onyando

Moturi

et al. 2016

Energ. Ecol. Environ.

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The fate and transport of Escherichia coli (E. coli) in lotic waters through vegetated filter strips (VFSs) was evaluated in a field model pasture, utilizing VFSMOD Windows along with direct pathogen testing. This study assessed effects of VFS on transport and deposition rates of E. coli in lotic overland flow waters. The VFS measured 44 m long by 40 m wide, covering an area of 1584 m2 and land slope of 15 %. Cowpat was applied onto the model pasture and washed by overland flow into the VFS. The 4-methylumbelliferyl β-D-glucuronide substrate confirmed the identity of E. coli prior to cowpat application and after isolating them from soil using centrifugation and membrane filtration techniques. Napier grass root system recorded the highest recovery rates of E. coli at 99.9 % along the length of VFS III. This efficiency reduced significantly (p < 0.05; df = 29) to 95 % in Kikuyu grass and 75 % in Couch grass–Buffer grass. The data demonstrated similarity in transport of manure-borne E. coli and organic carbon (OC) through all the simulated VFS. These results indicated that OC could be used as a true natural tracer of manure-borne E. coli, a pollution indicator organism of lentic and lotic surface waters provided the OC release kinetics from cowpat were similar to that of E. coli kinetics. Thus, efficient filtering to reduce E. coli concentrations and load in overland flows requires managing combined grass species, agro-pastoral systems models and dispersed or preferential flows to enhance surface water quality standards.

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