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Cryptosporidium Attenuation across the Wastewater Treatment Train: Recycled Water Fit for Purpose.

ABSTRACT: Compliance with guideline removal targets for Cryptosporidium which do not provide any credit for the inactivation of oocysts through wastewater treatment processes can considerably increase the cost of providing recycled water. Here we present the application of an integrated assay to quantify both oocyst numbers and infectivity levels after various treatment stages at three Victorian and two South Australian (SA) wastewater treatment plants (WWTPs). Oocyst density in the raw sewage was commensurate with community disease burden, with early rounds of sampling capturing a widespread cryptosporidiosis outbreak in Victoria. The level of infectivity of oocysts in sewage was stable throughout the year but was significantly lower at the SA WWTPs. Removals across secondary treatment processes were seasonal, with poorer removals associated with inflow variability; however, no decrease in the oocyst infectivity was identified. For SA WWTPs, those oocysts remaining within the secondary treatment-clarified effluent were proportionally more infectious than those in raw sewage. Lagoon systems demonstrated significant inactivation or removal of oocysts, with attenuation being seasonal. Examination of a UV system emphasized its efficacy as a disinfectant barrier but conversely confirmed the importance of a multibarrier approach with the detection of infectious oocysts postdisinfection. The ability to characterize risk from infectious oocysts revealed that the risk from Cryptosporidium is significantly lower than previously thought and that its inclusion in quantitative risk assessments of reuse systems will more accurately direct the selection of treatment strategies and capital expenditure, influencing the sustainability of such schemes.IMPORTANCE Here we present the application of a recently developed integrated assay not only to quantify the removal of Cryptosporidium oocysts but also to quantify their infectivity across various treatment stages at five wastewater treatment plants (WWTPs), thereby better measuring the "true effect" of the treatment train on oocyst risk reduction. For a number of the WWTPs analyzed in this study the risk, is significantly lower than previously thought. Therefore, the inclusion of oocyst infectivity in guideline values and in quantitative microbial risk assessment (QMRA) has the potential to affect future treatment directions and capital expenditure.

SUBMITTER: King B

PROVIDER: S-EPMC5311398 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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Cryptosporidium Attenuation across the Wastewater Treatment Train: Recycled Water Fit for Purpose.

King Brendon B Fanok Stella S Phillips Renae R Lau Melody M van den Akker Ben B Monis Paul P

Applied and environmental microbiology 20170215 5

Compliance with guideline removal targets for <i>Cryptosporidium</i> which do not provide any credit for the inactivation of oocysts through wastewater treatment processes can considerably increase the cost of providing recycled water. Here we present the application of an integrated assay to quantify both oocyst numbers and infectivity levels after various treatment stages at three Victorian and two South Australian (SA) wastewater treatment plants (WWTPs). Oocyst density in the raw sewage was ...[more]

PMID: 28039137

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Project description:Rationale, aims and objectivesThe field of implementation science is critical for embedding research evidence into healthcare practice, benefiting individuals, organizations, governments, and the broader community. Implementation science is messy and complex, underpinned by many theories and frameworks. Efficacious interventions for older people with multiple comorbidities exist, yet many lack effectiveness evaluation relevant to pragmatic implementation within aged care practice. This article outlines the conceptualization and development of an Implementation Framework for Aged Care (IFAC), fit-for-purpose for an aged care organization, Bolton Clarke, intent on embedding evidence into practice.MethodA four-stage process was adopted to (1) explore context and relevant literature to conceptualize the IFAC; (2) identify key elements for a draft IFAC; (3) expand elements and refine the draft in consultation with experts and (4) apply the IFAC to three existing projects, identifying key learnings. A checklist to operationalize the IFAC was then developed.ResultsThe IFAC is grounded in codesign principles and encapsulated by the implementation context, from a social, cultural and political perspective. The IFAC addresses the questions of (1) why do we need to change?; (2) what do we know?; (3) who will benefit?; (4) who will make the change?; (5) what strategies will be used?; and (6) what difference are we making? Three pilot projects: early adoption of a Wellness and Reablement approach; a care worker and virtual physiotherapist-led program to prevent falls; and a therapeutic horticulture program for residential communities, highlight learnings of applying the IFAC in practice.ConclusionThis fit-for-purpose IFAC was developed for a proactive and responsive aged care provider. The simplicity of the six-question IFAC is underpinned by substantial theoretical perspectives for its elements and their connections. This complexity is then consolidated into an 18-question checklist to operationalize the IFAC, necessary to advance the translation of evidence into clinical practice.

Dataset Information

Cryptosporidium Attenuation across the Wastewater Treatment Train: Recycled Water Fit for Purpose.

Publications

Cryptosporidium Attenuation across the Wastewater Treatment Train: Recycled Water Fit for Purpose.

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