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RESEARCH ARTICLE: The Effect of Ferric Chloride Addition for Phosphorus Removal on Ultraviolet Radiation Disinfection of Wastewater

Published online by Cambridge University Press:  07 January 2011

Joseph A. Kozak ,
David T. Lordi ,
Zainul Abedin ,
Catherine O'Connor ,
Thomas Granato  and
Louis Kollias
Joseph A. Kozak*
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
David T. Lordi
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
Zainul Abedin
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
Catherine O'Connor
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
Thomas Granato
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
Louis Kollias
Affiliation:
Metropolitan Water Reclamation District of Greater Chicago, Cicero, Illinois
*
Joseph A. Kozak, Associate Environmental Research Scientist, Metropolitan Water Reclamation District of Greater Chicago, 6001 West Pershing Road, Cicero, IL 60804; (phone) 708-588-3780; (fax) 708-588-4253; (e-mail) [email protected]
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Abstract

In light of the potential need for disinfection and nutrient removal at the Metropolitan Water Reclamation District of Greater Chicago's water reclamation plants (WRPs), the inhibitory effects of ferric chloride (FeCl3) on ultraviolet (UV) radiation disinfection was examined. Results of a 2007 preliminary study indicated that a 2-log reduction in fecal coliform (FC) concentrations for each WRP secondary effluent was achieved with a UV dose of 10 mJ/cm2 except for the John E. Egan (Egan) WRP, where FeCl3 addition in the aeration basin for phosphorus removal was being employed. A subsequent study examined the effect of Egan unfiltered (secondary) and filtered (final) effluent on UV disinfection in 2008 during FeCl3 application and 2009 upon cessation of FeCl3 application: FeCl3 addition and filtration had little effect on UV transmittance (UVT). However, with FeCl3 addition, secondary and final effluent had higher total iron and lower total phosphorus relative to the respective secondary and final effluent without FeCl3 addition. Final effluent with and without FeCl3 addition showed lower total suspended solids concentrations relative to secondary effluent. Collimated beam test results indicated that a higher UV dose was needed to achieve the desired log reductions with FeCl3 addition and secondary effluent. Therefore, filtration of the effluent may be required if FeCl3 addition for nutrient removal is used at WRPs that employ UV disinfection.

Environmental Practice 12:275–284 (2010)

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Information
Environmental Practice , Volume 12 , Issue 4 , December 2010 , pp. 275 - 284
Copyright
Copyright © National Association of Environmental Professionals 2010

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References

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