Diferencias hidrológicas anuales y estacionales en regiones adyacentes: estudio de las subcuencas de los ríos Virilla y Grande de San Ramón, Costa Rica

Quesada, E Q Marvin; Waylen, Peter R.

doi:10.15446/rcdg.v21n2.32218

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Virus decay followed a first-order decay equation ( 53), using mean decay rates determined from experiments with similar conditions to those in the Virilla River (54)(55)(56). The WWTP effluent in this study is indirectly reused at distances ranging from 1 m to 3 km from WWTP discharge; thus, decay time was defined as a uniform distribution between 0 and 1 days (57). Since the dilution factor can vary greatly over time and on June 29, 2020 at Glasgow University Library http://aem.asm.org/ Downloaded from by season, the dilution factor was defined as a uniform distribution between a conservative dilution factor (99:1) and a maximum dilution factor (50,000:1) (53).…”

Section: Quantitative Microbial Risk Assessment For Indirect Reuse Of Wastewater Treatment Plant Effluent Meeting the Somatic Coliphage Tmentioning

confidence: 99%

A Somatic Coliphage Threshold Approach To Improve the Management of Activated Sludge Wastewater Treatment Plant Effluents in Resource-Limited Regions

Chacón

Barrantes

Santamaría‐Ulloa

et al. 2020

Appl Environ Microbiol

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Effective wastewater management is crucial to ensure the safety of water reuse projects and effluent discharge into surface waters. Multiple studies have demonstrated that municipal wastewater treatment with conventional activated sludge processes is inefficient for the removal of the wide spectrum of viruses in sewage. In this study, a well-accepted statistical approach was used to investigate the relationship between viral indicators and human enteric viruses during wastewater treatment in a resource-limited region. Influent and effluent samples from five urban wastewater treatment plants (WWTP) in Costa Rica were analyzed for somatic coliphage and human enterovirus, hepatitis A virus, norovirus genotype I and II, and rotavirus. All WWTP provide primary treatment followed by conventional activated sludge treatment prior to discharge into surface waters that are indirectly used for agricultural irrigation. The results revealed a statistically significant relationship between the detection of at least one of the five human enteric viruses and somatic coliphage. Multiple logistic regression and Receiver Operating Characteristic curve analysis identified a threshold of 3.0 ×103 (3.5-log10) somatic coliphage plaque forming unit per 100 mL, which corresponded to an increased likelihood of encountering enteric viruses above the limit of detection (>1.83×102 virus target/100 mL). Additionally, quantitative microbial risk assessment was executed for famers indirectly reusing WWTP effluent that met the proposed threshold. The resulting estimated median cumulative annual disease burden complied with World Health Organization recommendations. Future studies are needed to validate the proposed threshold for use in Costa Rica and other regions. Importance Effective wastewater management is crucial to ensure safe direct and indirect water reuse; nevertheless, few countries have adopted the virus log reduction value management approach established by the World Health Organization. In this study, we investigated an alternative and/or complementary approach to the virus log reduction value framework for the indirect reuse of activated sludge treated wastewater effluent. Specifically, we employed a well-accepted statistical approach to identify a statistically sound somatic coliphage threshold value, which corresponded to an increased likelihood of human enteric virus detection. This study demonstrates an alternative approach to the virus log reduction value framework, which can be applied to improve wastewater reuse practices and effluent management.

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Section: Quantitative Microbial Risk Assessment For Indirect Reuse Of Wastewater Treatment Plant Effluent Meeting the Somatic Coliphage Tmentioning

confidence: 99%

A Somatic Coliphage Threshold Approach To Improve the Management of Activated Sludge Wastewater Treatment Plant Effluents in Resource-Limited Regions

Chacón

Barrantes

Santamaría‐Ulloa

et al. 2020

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

Diferencias hidrológicas anuales y estacionales en regiones adyacentes: estudio de las subcuencas de los ríos Virilla y Grande de San Ramón, Costa Rica

Cited by 1 publication

References 7 publications

A Somatic Coliphage Threshold Approach To Improve the Management of Activated Sludge Wastewater Treatment Plant Effluents in Resource-Limited Regions

A Somatic Coliphage Threshold Approach To Improve the Management of Activated Sludge Wastewater Treatment Plant Effluents in Resource-Limited Regions

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