TY - JOUR
T1 - Settling and Peracetic Acid for End-of-Pipe Treatment of sul 1-Carrying Indicator Organisms and Impact on Receiving Water
AU - Eramo, Alessia
AU - Blanc, Sophia
AU - Fahrenfeld, Nicole L.
N1 - Funding Information:
The authors would like to thank their utility partner for providing access to influent samples. Funding for this project was provided by a Mark B. Bain Fellowship from the Hudson River Foundation to Alessia Eramo and a grant from the National Science Foundation (Grant No. 1510461). Additional funding support was provided by an Eagleton Fellowship Program to Alessia Eramo. Thanks also to William Morales Medina for his assistance in the lab in support of this project.
Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Combined sewer overflow (CSO) negatively impacts water quality during wet weather. An end-of-pipe treatment train with settleable particle removal and peracetic acid (PAA) disinfection was investigated for treatment of Escherichia coli (E. coli), sul1 gene-carrying E. coli, and total coliform (TC) in simulated CSO effluent. Settling reduced chemical oxygen demand by 49%±11% and total suspended solids by 78%±7%. Overall removals of 3.1±0.14-log and 2.5±0.37-log were achieved for E. coli and TC, respectively, with settling and disinfection, but these removals were not significantly different from removals with disinfection only. After disinfection, the fraction of E. coli carrying the antibiotic-resistance gene (ARG) sul1 increased. Treated samples were spiked into estuarine water to determine regrowth potential of target bacteria following release. After 7 days, E. coli was not detected in reactors with treated CSO, and TC concentrations decreased significantly. This research provides insight into a potential end-of-pipe treatment and suggests that disinfection rather than settling is more effective for microbial treatment of the wastewater component of CSO effluent.
AB - Combined sewer overflow (CSO) negatively impacts water quality during wet weather. An end-of-pipe treatment train with settleable particle removal and peracetic acid (PAA) disinfection was investigated for treatment of Escherichia coli (E. coli), sul1 gene-carrying E. coli, and total coliform (TC) in simulated CSO effluent. Settling reduced chemical oxygen demand by 49%±11% and total suspended solids by 78%±7%. Overall removals of 3.1±0.14-log and 2.5±0.37-log were achieved for E. coli and TC, respectively, with settling and disinfection, but these removals were not significantly different from removals with disinfection only. After disinfection, the fraction of E. coli carrying the antibiotic-resistance gene (ARG) sul1 increased. Treated samples were spiked into estuarine water to determine regrowth potential of target bacteria following release. After 7 days, E. coli was not detected in reactors with treated CSO, and TC concentrations decreased significantly. This research provides insight into a potential end-of-pipe treatment and suggests that disinfection rather than settling is more effective for microbial treatment of the wastewater component of CSO effluent.
KW - Antibiotic-resistance selection
KW - Combined sewer overflow
KW - Fecal indicator bacteria
KW - Peracetic acid
KW - Regrowth
KW - Settling
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U2 - 10.1061/(ASCE)EE.1943-7870.0001573
DO - 10.1061/(ASCE)EE.1943-7870.0001573
M3 - Article
AN - SCOPUS:85070555896
SN - 0733-9372
VL - 145
JO - Journal of Environmental Engineering (United States)
JF - Journal of Environmental Engineering (United States)
IS - 10
M1 - 04019064
ER -