Findings from a One-Year Pathogen Monitoring Study to Support Potable Reuse at the City of Oceanside, CA

Pecson, Brian M.; Dale, Cari; Trussell, Shane; Rose, Joan B.; Ives, Rebecca; Idica, Eileen Y.; Bartolo, Mitch; Faulker, Brett; Kaufmann, Anya; Trussell, R. Rhodes

doi:10.2175/193864717822156884

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are a limited number of datasets available that quantitatively describe the extent of virus removal by primary and secondary wastewater treatment. Two recent studies performed at wastewater treatment facilities near San Diego, CA evaluated the removal of enterovirus, Giardia, and Cryptosporidium [7,8]. The City of San Diego's Pathogen Monitoring Study [7] implemented a long-term sampling plan for their North City Water Reclamation Plant to characterize virus removal and was the first study to obtain virus log removal credits in California.…”

Section: Introductionmentioning

confidence: 99%

“…Two recent studies performed at wastewater treatment facilities near San Diego, CA evaluated the removal of enterovirus, Giardia, and Cryptosporidium [7,8]. The City of San Diego's Pathogen Monitoring Study [7] implemented a long-term sampling plan for their North City Water Reclamation Plant to characterize virus removal and was the first study to obtain virus log removal credits in California. Both studies demonstrated virus log removal where Pecson et al [7] proposed a 5 th percentile 0.7 log removal value and Bartolo et al [8] (for a different facility) proposed a median 2.8 log removal value for enteric viruses for activated sludge wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

“…The City of San Diego's Pathogen Monitoring Study [7] implemented a long-term sampling plan for their North City Water Reclamation Plant to characterize virus removal and was the first study to obtain virus log removal credits in California. Both studies demonstrated virus log removal where Pecson et al [7] proposed a 5 th percentile 0.7 log removal value and Bartolo et al [8] (for a different facility) proposed a median 2.8 log removal value for enteric viruses for activated sludge wastewater treatment. Despite the general expectation that virus removal occurs during wastewater treatment, removal is not recognized (credited) unless an appropriate site-specific study is conducted and approved to establish a conservative virus log removal value [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enteric virus removal by municipal wastewater treatment to achieve requirements for potable reuse

Polanco,

Safarik,

Dadakis

et al. 2023

PLOS Water

View full text Add to dashboard Cite

Primary and secondary treatment of municipal wastewater contributes to virus removal upstream of advanced purification to produce water for potable reuse. In this study, virus occurrence by cultivable and molecular methods was measured over a 24-month period in raw wastewater influents and secondary effluents from two municipal wastewater treatment plants that together provide the recycled water source for an advanced water purification facility. Using a rank-paired, covariance-based statistical approach, virus log removal values were determined for four wastewater treatment processes that operate in parallel at the two facilities (two activated sludge processes, trickling filter process, and trickling filter/solids contactor process). The trickling filter process exhibited the lowest observed removal of cultivable enteric virus with a median removal of 1.0 log10 (or 90% removal) and a 5th percentile log removal of 0.73 (or 82%), compared to the greatest removal observed for one of the activated sludge processes (median log removal of 2.4 or 99.6% and 5th percentile of 2.1 or 99.2%). Median log removal observed for male-specific (MS) and somatic (SOM) coliphage was 1.8 (98.6% removal) and 0.5 (70%), respectively, for trickling filter and 2.9 (99.9%) and 2.0 (99%) for activated sludge. Thus, coliphage removal was fairly similar to removal observed for cultivable enteric virus. The cultivable enteric virus 5th percentile removal (0.7) from the trickling filter treatment process was proposed to the state regulator for credit towards state requirements for virus removal related to groundwater augmentation with purified recycled water. Receiving pathogen removal credits for secondary wastewater treatment would allow for an improved margin (safety factor) of credits beyond the minimum required; and in this case may also increase the number of viable future groundwater recharge sites closer to drinking water production wells by reducing the underground travel time otherwise required to obtain sufficient credits.

show abstract

Section: Introductionmentioning

confidence: 99%