Home\WateReuse Pacific Northwest\How Do You Maintain Chlorine Residuals in Recycled Water?

How Do You Maintain Chlorine Residuals in Recycled Water?

2:30 p.m. – 3:30 p.m. EST
11:30 a.m. – 12:30 p.m. PST
PDHs: 1
Fee: Free for Association and Foundation members

Join WateReuse Pacific Northwest for a discussion of best practices and lessons learned on maintaining chlorine residuals in recycled water from an experienced utility manager and a consulting engineer.

Ben McConkey, Community Support Project Manager for the LOTT Clean Water Alliance in Olympia, WA, will present on various lessons learned from his time operating wastewater treatment plants. The presentation will include discussions of various design issues that may impact chlorine residuals, and the differences in operating a membrane bioreactor (MBR) and sand filter system for recycled water. Ben will also outline the challenges associated with maintaining residuals in the distribution system and discuss ways to enhance control, considerations for points of use, and advantages of 2-stage disinfection for recycled water production.

Paul Friedlander, Associate Vice President with Carollo Engineers in Walnut Creek, CA, will present a case study on the Dublin San Ramon Services District which experienced difficulties maintaining chlorine residuals in its recycled water distribution system during the winter wet season months when irrigation demand was low. Water modeling confirmed that portions of the distribution system had a very high water age during the low demand months, and water quality monitoring suggested nitrification was occurring. The presentation discusses actions taken by the district to identify the cause of and implement solutions to the problem.

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