HomeMy WebLinkAboutItem 9 PPP 09-09-2020 Administration Committee - Sewage Surveillance Project UpdateWastewater Surveillance for COVID-19
Presented by Lan Wiborg
Director of Environmental Services
Administration Committee
September 9, 2020
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Keeping up with the COVID-19 Headlines
9 days later, in a
follow-up article
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Wastewater Surveillance
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Wastewater and SARS-CoV-2
Questions from Media/Public/Employees
Is OCSD testing its sewage for SARS-CoV-2? Why?
When will OCSD receive preliminary results?
What can OCSD do with these results?
Sewage surveillance for COVID-19 in OC?
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Key Considerations
Lessons from prior wastewater surveillance efforts
Obtain expert advice
Establish current and future use cases
Sustainable field and laboratory resources
Criteria for collaboration
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Research Partners
State Water Board
•Add-on to DPR-2 project
•Multi-benefit for water reuse agencies
•No existing method
University of Arizona
•Extensive experience with SARS-CoV-1
•Existing method for wastewater matrix
Stanford University
•Innovation grant for method development
•Nationwide recruitment of WWTPs
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State Water Board
DPR Research Projects
Image Source: B. Pecson/Trussell Technologies, Inc.
“DPR-2”
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State Water Board: DPR-2
Method
Development
Detection and
Quantification
DPR Treatment Effectiveness
Help to develop Direct Potable Reuse Criteria
•Samples from five major CA POTWs
•Sample collection since November 2019
•Added SARS-CoV-2 to study in April 2020
•Method optimization
•Comparability assessment
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DPR-2 Preliminary Data
Image Source: B. Pecson/Trussell Technologies, Inc.
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University of Arizona
Detection and
Quantification
Viability
WW Treatment Effectiveness
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University of Arizona
Image Source: University of Arizona/OCSD
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Comparing Results
Image Source: B. Pecson/Trussell Technologies, Inc.Image Source: University of Arizona/OCSD 12
Stanford University
Method Development
Detection and
Quantification
Data Management
Data Modeling
Samples from US WWTPs
•25 CA WWTPs
•24 WWTPs outside CA
•Archived 1,700 samples to date
•Analyzed 2 POTWs to date
Image Source: A. Boehm/Stanford University 13
Stanford University
Method Development
•SARS-CoV-2 affinity for solids
•qPCR vs. digital droplet PCR
Image Source: A. Boehm/Stanford University 14
Stanford University
Preliminary Results
•Primary settled solids data
•Tracking with confirmed clinical cases
•Data analysis and modeling in progress
Cannot Use to Predict Prevalence
•Missing key variable –virus shed in feces
•Prediction of COVID-19 unrealistically high
Recommendations
•PH information must guide sampling
•Supply chain issues
Image Source: A. Boehm/Stanford University 15
CDC Perspective
•Sewage is an efficient pooled sample of community (or sub-community) infection prevalence
•Captures sub-clinical infections
•Independent of healthcare-seeking behavior and testing access
•Data available within days of shedding onset versus up to 2-week lag for other data
•Data collection at CDC to facilitate national disease surveillance interpretation and public health actions
Information and mage Source: A. Kirby/CDC 16
National Wastewater Surveillance System
Image Source: A. Kirby/CDC 17
CDC’s Role in NWSS
Image Source: A. Kirby/CDC 18
Next Steps
Sampling and
Analytical Methods
Sewer Dynamics
Continue Coordination with OCHCA
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Acknowledgements
Technical
Advisors
Ian Pepper, PhD
Director, WEST Center
University of Arizona
Charles Gerba, PhD
Professor, Environmental Science
University of Arizona
Walter Betancourt, PhD
Assoc. Research Professor, Env. Science
University of Arizona
Greg Kester, PE
Director of Renewable Resources Programs
CA Assoc. of Sanitation Agencies
OCSD
James Herberg, PE
General Manager
Ron Coss, MSPH, MPA, BCES
Laboratory, Monitoring, and Compliance Manager
Sam Choi, PhD
Environmental Supervisor
Roya Sohanaki, PE
Engineering Manager
Jennifer Cabral, MPA
Administrative Services Manager
Regional
Advisors
Haruna (Hana) Feldman, PhD, MPH Group Program ManagerData & Performance Analytics UnitChief Administrative Office County of San Diego
Alissa Dratch, MPH
Epidemiologist
Communicable Disease Control
Orange County Health Care Agency
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Questions?
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