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Characterizing the Quality of Effluent and Other Contributory Sources During Peak Wet Weather Events

By
Donald M.D. Gray
Donald M.D. Gray
(Gabb)
East Bay Municipal Utility District, 2020 Wake Avenue Oakland, CA 94607, Phone: (510) 287-1602, Fax: (510) 287-1712, , Email: dgabb@ebmud.com
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Yun Shang
Yun Shang
East Bay Municipal Utility District
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John M. Hake
John M. Hake
East Bay Municipal Utility District
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Vincent P. De Lange
Vincent P. De Lange
East Bay Municipal Utility District
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Mark H. Chien
Mark H. Chien
East Bay Municipal Utility District
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Erika R. Gardner
Erika R. Gardner
East Bay Municipal Utility District
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Jon Konnan
Jon Konnan
EOA, Inc.
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Stacie Grinbergs
Stacie Grinbergs
Resource Management Associates
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IWA Publishing
Volume
9
ISBN electronic:
9781780403533
Publication date:
March 2010

This study evaluates the impacts of blending practices at municipal wastewater treatment plants on effluent and receiving water quality, and estimates public health risks associated with recreation in surface waters receiving blended flows. Field samples were collected at four municipal wastewater treatment plants for in-plant processes and receiving waters during wet weather blending, wet weather non-blending, and dry weather events. Laboratory analyses for Giardia, Cryptosporidium, viruses (adenovirus, enteric viruses, rotavirus, norovirus), pathogen indicator organisms (fecal coliform E. coli, enterococcus, and male specific coliphage), and other water quality parameters were performed on these samples. Field sample results for the East Bay Municipal Utility District's (EBMUD) Main Wastewater Treatment Plant were used to develop a hydrodynamic and water quality computer models to predict receiving water conditions and a quantitative microbial risk assessment (MRA) to evaluate increased risks of gastrointestinal and respiratory infections for people recreating in waters receiving blended flows.

EBMUD field sampling results indicated that Giardia and adenovirus concentrations in plant final effluent increased during wet weather blending events in comparison to non-blending events, and so receiving water modeling was conducted for these organisms. T-test results indicated that the differences between blending and non-blending were not considered to be statistically significant for any of the pathogen and indicator organisms except Giardia cysts (enumeration). Additionally, TSS, cBOD5 and particle concentrations from final effluent grab samples also appeared higher during blending events, but no increase was observed in VOC levels during these periods, and no NPDES permit limits were exceeded. An estimate of the incremental annual number of infections associated with blending practices at EBMUD's wastewater treatment plant was developed based on two pathogens (adenovirus and Giardia spp.) and three exposure sites. Estimated individual risk per exposure event for people recreating in waters receiving blended flows were greater by about an order-of-magnitude (10x) at the EBMUD MWWTP Outfall location and less than an order-of-magnitude (10x) at three other exposure sites, than if these blended flows received full secondary biological treatment during wet weather conditions. Thus the relative increase of annualized risk appeared negligible, at less than one infection annually assuming 100 exposure events per day for 30 blending days per year.

This title belongs to WERF Research Report Series.

ISBN: 9781843392989 (Print)

ISBN: 9781780403533 (eBook)

Characterizing the Quality of Effluent and Other Contributory Sources During Peak Wet Weather Events
By: Donald M.D. Gray, Yun Shang, John M. Hake, Vincent P. De Lange, Mark H. Chien, Erika R. Gardner, Jon Konnan, Stacie Grinbergs
DOI: https://doi.org/10.2166/9781780403533
ISBN (electronic): 9781780403533
Publisher: IWA Publishing
Published: 2010

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