On-Site Evaluation of UV Disinfection on Trickling Filter / Solids Contact Effluent

Description:The City of Abbotsford operates the JAMES WWTP, which is a facility that is based on a trickling filter/solids contact process that uses a combination of chlorine and sulphur dioxide for final effluent disinfection. The City's recent Wastewater Master Plan has recommended moving away from gas-based disinfection to an alternative option. Ultraviolet disinfection was identified as a potential candidate process in the Master Plan. The combination of TF/SC and UV disinfection is not widely used, so the basis for a full-scale design could prove to be challenging. As a means to better understand the viability of UV disinfection at the WWTP, a pilot study was undertaken in 2011. This study involved the treatment of a side stream of secondary effluent taken upstream of the existing chlorine contact process. The pilot, which was installed in December 2010, was based on a 24 lamp configuration capable of treating up to 50L/s. Data collection commenced in January 2011 in accordance with a pre-determined sampling protocol. The protocol was intended to monitor all of the parameters that would be expected to influence the performance. The design target for fecal coliform under this study was set at 200 CFU/100mL. The UV reactor has consistently met this disinfection target during the pilot work. Throughout the study, adjustments were made to the UV dosage and lamp cleaning frequency to determine the impact on pathogen inactivation. Overall, the pilot study has proven that UV disinfection can be successfully implemented on a full-scale basis at the JAMES WWTP.

Authors: Chiu, Stella; Celli, Michael ; Lycon, David

Subjects: Wastewater

Tags:ac2012

Citation:2012 BCWWA Annual Conference, Session 16, Penticton

Publication Date:Jul 1st, 2012 Upload Date:Jul 1st, 2012

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