A CT APPROACH FOR WASTEWATER DISINFECTION

Christopher Schulz; Mike Carver; Rick Thornton

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A CT APPROACH FOR WASTEWATER DISINFECTION

Abstract

THE PROBLEM The Colorado Department of Public Health and Environment (CDPHE) recently amended the Metro Wastewater Reclamation Districts (District) 183-mgd Central Treatment Plant discharge permit stipulating by January 1, 2008, E. coli limits will be reduced to 126/252 per 100mL (30-day/7-day geometric mean), and that a 30-minute disinfection contact time at peak hour design flow must be achieved. Although the plant meets all applicable discharge permit criteria, the existing disinfection contact time does not meet CDPHE design guidelines. Use of concentration-time (CT) relationships could allow the District to meet E. coli inactivation requirements without expanding chlorine contact basin capacity.

THE PROBLEM The Colorado Department of Public Health and Environment (CDPHE) recently amended the Metro Wastewater Reclamation Districts (District) 183-mgd Central Treatment Plant discharge permit stipulating by January 1, 2008, E. coli limits will be reduced to 126/252 per 100mL (30-day/7-day geometric mean), and that a 30-minute disinfection contact time at peak hour design flow must be...

Author(s)

Christopher SchulzMike CarverRick Thornton

SourceProceedings of the Water Environment Federation

SubjectSession 18: Management of Odors and VOCs/Disinfection: UV - The Role of Bioassays and Piloting

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Jan, 2005

ISSN1938-6478

SICI1938-6478(20050101)2005:15L.1559;1-

DOI10.2175/193864705783869574

Volume / Issue2005 / 15

Content sourceWEFTEC