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The filter media treatment process can significantly accelerate filter ripening, reduce the turbidity spikes when restarting the plant, effectively improve the filter performance, and make the filter less sensitive to fluctuations in influent turbidity. After 60 hours of operation addition of PACl to the test filter was terminatedIn addition, it could reduce the coagulant dose used during flocculation.
The incremental cost of filter media treatment was estimated to be 4.70E-4 USD/m3 of filtered water based on the liquid PACl cost of 0.5 USD/L (2 USD/gallon) and an application rate of 0.06 mg/L as aluminum (slightly above the lowest dose used in this study). Filter media treatment can be accomplished with a single metering pump for an entire water treatment plant with all filter influent receiving a constant dose. Installation of the required PACl injection line from the existing PACl stock tanks to a point somewhere between the sedimentation tank effluent and the filter influent should be relatively straight forward. This economic analysis does not consider the possibility of using improved particle capture in filters as an opportunity to reduce the coagulant dose used before sedimentation.
Method of application in Drinking Water Treatment Plants
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