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?
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