Fecal Indicator Bacteria Transport and Deposition in Saturated and Unsaturated Porous Media

2012 ◽  
Vol 46 (16) ◽  
pp. 8782-8790 ◽  
Author(s):  
Gexin Chen ◽  
Sharon L. Walker
Keyword(s):  
Porous Media ◽  
Fecal Indicator Bacteria ◽  
Indicator Bacteria ◽  
Unsaturated Porous Media ◽  
Fecal Indicator ◽  
Bacteria Transport

scholarly journals Fecal Indicator Bacteria Transport from Watersheds with Differing Wastewater Technologies and Septic System Densities

2020 ◽  
Vol 10 (18) ◽  
pp. 6525
Author(s):  
Guy Iverson ◽  
Christa Sanderford ◽  
Charles P. Humphrey ◽  
J. Randall Etheridge ◽  
Timothy Kelley
Keyword(s):  
Wastewater Treatment ◽  
Fecal Indicator Bacteria ◽  
Indicator Bacteria ◽  
Septic Systems ◽  
Watershed Scale ◽  
Septic System ◽  
Treatment Technology ◽  
Fecal Indicator ◽  
Bacteria Transport ◽  
Density Threshold

Wastewater contains elevated concentrations of fecal indicator bacteria (FIB). The type of wastewater treatment technology and septic system density may influence the FIB concentration and exports at the watershed scale. The goal of this study was to gain a better understanding of FIB concentrations and exports from watersheds served by conventional septic (CS) systems, sand filter (SF) septic systems, and a municipal sewer (SEW) system. Seven watersheds (3 CS, 3 SF, and 1 SEW) were monitored to quantify FIB concentration and export monthly from April 2015 to March 2016. The type of wastewater treatment did not yield significant differences in FIB concentration or exports when pooling watersheds using similar wastewater treatment. Watersheds with the highest septic densities (approximately 0.4 systems ha−1) contained greater FIB concentrations and exports than watersheds with the lowest (approximately 0.1–0.2 systems ha−1), but only FIB concentrations significantly differed. These findings suggest that when the septic system density exceeds 0.4 systems ha−1, water quality degradation from septic leachate may be observable at the watershed scale, especially in watersheds dominated by residential development. More research is recommended to determine if this density threshold is similar for other water pollutants and/or in watersheds with differing hydrogeological, land use, and wastewater characteristics.

Marker genes of fecal indicator bacteria and potential pathogens in animal feces in subtropical catchments

2019 ◽  
Vol 656 ◽  
pp. 1427-1435 ◽  
Author(s):  
Warish Ahmed ◽  
Christian O'Dea ◽  
Nicole Masters ◽  
Anna Kuballa ◽  
Oswald Marinoni ◽  
...  
Keyword(s):  
Fecal Indicator Bacteria ◽  
Indicator Bacteria ◽  
Marker Genes ◽  
Fecal Indicator ◽  
Animal Feces

scholarly journals Decay of Fecal Indicator Bacterial Populations and Bovine-Associated Source-Tracking Markers in Freshly Deposited Cow Pats

2013 ◽  
Vol 80 (1) ◽  
pp. 110-118 ◽  
Author(s):  
Adelumola Oladeinde ◽  
Thomas Bohrmann ◽  
Kelvin Wong ◽  
S. T. Purucker ◽  
Ken Bradshaw ◽  
...  
Keyword(s):  
Decay Rate ◽  
Fecal Indicator Bacteria ◽  
Decay Rates ◽  
Indicator Bacteria ◽  
Source Tracking ◽  
Fecal Indicator ◽  
Bacterial Populations ◽  
Content Type ◽  
E Coli ◽  
Decay Dynamic

ABSTRACTUnderstanding the survival of fecal indicator bacteria (FIB) and microbial source-tracking (MST) markers is critical to developing pathogen fate and transport models. Although pathogen survival in water microcosms and manure-amended soils is well documented, little is known about their survival in intact cow pats deposited on pastures. We conducted a study to determine decay rates of fecal indicator bacteria (Escherichia coliand enterococci) and bovine-associated MST markers (CowM3, Rum-2-bac, and GenBac) in 18 freshly deposited cattle feces from three farms in northern Georgia. Samples were randomly assigned to shaded or unshaded treatment in order to determine the effects of sunlight, moisture, and temperature on decay rates. A general linear model (GLM) framework was used to determine decay rates. Shading significantly decreased the decay rate of theE. colipopulation (P< 0.0001), with a rate of −0.176 day−1for the shaded treatment and −0.297 day−1for the unshaded treatment. Shading had no significant effect on decay rates of enterococci, CowM3, Rum-2-bac, and GenBac (P> 0.05). In addition,E. colipopulations showed a significant growth rate (0.881 day−1) in the unshaded samples during the first 5 days after deposition. UV-B was the most important parameter explaining the decay rate ofE. colipopulations. A comparison of the decay behaviors among all markers indicated that enterococcus concentrations exhibit a better correlation with the MST markers thanE. coliconcentrations. Our results indicate that bovine-associated MST markers can survive in cow pats for at least 1 month after excretion, and although their decay dynamic differs from the decay dynamic ofE. colipopulations, they seem to be reliable markers to use in combination with enterococci to monitor fecal pollution from pasture lands.

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