A comparative pilot scale study analyzing the performance of biological versus conventional drinking water filtration with the application of various backwash strategies for headloss and ripening control

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  • A pilot scale comparison study between conventional and biological dual media anthracite/sand filters was conducted to assess their performance and address industry concerns with biofiltration. The filters were subjected to various backwash and temperature conditions, including the addition of air scour and extended terminal subfluidization wash (ETSW) at 15-25°C and 0-5°C. The biofilters had significantly lower DBP formations (p<0.05) than the conventional filters under all conditions, by 33-46%. The biofilters exhibited greater headloss development than the conventional filters with a water only backwash, but it was found to be minimized by up to 19% when applying air scour and ETSW under warm water conditions. The conventional filters proved to be more vulnerable in terms of particle release during ripening, regardless of backwash strategy. A double stage ETSW step was also explored and found to improve ripening particle counts and turbidity in both filter types, even further than a single stage ETSW, while simultaneously providing headloss control.

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  • Copyright © 2019 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2019


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