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Thursday, November 14 • 3:15pm - 4:00pm
Session B - Granular Media Filtration is a Batch Process: Comparison of Various Backwash Procedures and the Effect on Filter Performance

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The backwash steps discussed will include:
• Filter drain-down
• Air scour, including rates and duration
• Low-rate and high-rate backwash, including flowrate and duration
• Filter media restratification

The presentation will provide Operators with answers to the following questions:
• What is the relationship between poor filter performance and backwash?
• How long does it take to see the effect of a poor backwash program on filter performance?
• How long does it take to see the effect of changes made to the backwash program on filter performance?
• How can the backwash procedure contribute to filter media loss?
• Which backwash procedure is the best?
• Which backwash parameters and data should the Operator be monitoring, trending and collecting?

The presentation will also discuss:
• Stand-alone air scour and backwash vs. concurrent air-water wash: Which is better?
• Backwash turbidity profile: What does it tell us? What doesn’t it tell us?
• Monitoring and trending of backwash pressure: Why is it a critical part of filter operation?


AWI (Anthratech Western Inc)

AWI Filter
AWI Filter

Thursday November 14, 2019 3:15pm - 4:00pm MST
Double Tree by Hilton 16615 109th Avenue North West, Edmonton, Alberta,