scholarly journals Spatial Distribution of Fecal Indicator Bacteria in Groundwater beneath Two Large On-Site Wastewater Treatment Systems

Water ◽  
2014 ◽  
Vol 6 (3) ◽  
pp. 602-619 ◽  
Author(s):  
Charles Humphrey ◽  
Michael O'Driscoll ◽  
Jonathan Harris
Keyword(s):  
Wastewater Treatment ◽  
Spatial Distribution ◽  
Fecal Indicator Bacteria ◽  
Indicator Bacteria ◽  
Fecal Indicator ◽  
Wastewater Treatment Systems

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.

scholarly journals Persistence of fecal indicator bacteria and associated genetic markers from wastewater treatment plant effluents in freshwater microcosms

2021 ◽  
Author(s):  
Eunice C. Chern ◽  
Larry Wymer ◽  
Kristen Brenner ◽  
Kevin Oshima ◽  
Richard A. Haugland
Keyword(s):  
Wastewater Treatment ◽  
Decay Rate ◽  
Genetic Marker ◽  
Genetic Markers ◽  
Rate Constants ◽  
Fecal Indicator Bacteria ◽  
Treatment Plant ◽  
Indicator Bacteria ◽  
Treated Wastewater ◽  
Fecal Indicator

Abstract Limited information exists on the environmental persistence of genetic markers for fecal indicator bacteria (FIB) in treated wastewaters. Here, the decay rate constants of culturable cells and genetic markers for four diverse groups of FIBs, such as enterococci, Clostridium, Escherichia coli, and Bacteroides, were investigated in freshwater microcosms seeded with disinfected and non-disinfected secondary-treated wastewaters. Decay rate constants of genetic markers and culturable cells varied significantly among the different FIB groups. Water temperatures (winter vs. fall/spring/summer) significantly affected the decay of all genetic marker and cell types; however, genetic marker decay were not found to be significantly different in disinfected (chlorination/ultraviolet) and non-disinfected wastewater-seeded microcosms or, for example, lake- and river-receiving waters. No evidence was seen that decay rate constants of FIB genetic markers from treated wastewater were substantially different from those observed in similar, previously reported microcosm studies using raw sewage. Unexpected relationships between decay rate constants of genetic markers and culturable cells of Bacteroides were observed. Results suggest that decay rate constants of FIB genetic markers determined from other studies may be applicable to treated wastewaters. Results of this study should be informative for ongoing efforts to determine the persistence of FIB genetic markers relative to surviving pathogens after wastewater treatment.

Within-House Spatial Distribution of Fecal Indicator Bacteria in Poultry Litter

2017 ◽  
Vol 46 (5) ◽  
pp. 1003-1009 ◽  
Author(s):  
Scott Winkler ◽  
Craig Coufal ◽  
Daren Harmel ◽  
Emily Martin ◽  
John P. Brooks ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Fecal Indicator Bacteria ◽  
Poultry Litter ◽  
Indicator Bacteria ◽  
Fecal Indicator
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