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Evaluating Enhanced Chlorination as a Process for Meeting Strict Disinfection Standards

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Reuse of treated wastewater effluents for beneficial use requires high levels of disinfection to ensure pathogen destruction. In Arizona, water reuse is regulated by the Best Available, Demonstratable Control Technology (BADCT) standards which require non-detection of E.coli (<2.2 MPN/100 ml) in samples 4 days out of 7 (57%) and a single sample maximum of 15 MPN/100 ml. The Pima County Regional Wastewater Reclamation Department (PCRWRD) determined to evaluate the enhanced chlorination process in achieving BADCAT compliance with for its facilities where water reuse opportunities exist. The results found that the PCRWRD can meet BADCT standards using the enhanced chlorination process with the minimum CT target of 100 mg-min/L for E.coli inactivation, and implementing a series of upgrades to the existing chlorine injection/mixing system and contact basin. Critical to the success is consistent and reliable performance of upstream secondary clarifiers. Enhanced chlorination provides immediate and long range savings to the PCRWRD.

Document Type: Research Article


Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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