Normalized Permeate Flow trends

Data, particularly normalized data, is evaluated to determine the nature of the loss in membrane performance (see Chapter 11.3 for a complete discussion on data normalization). Normalized permeate flow, salt rejection, and differential pressure should be evaluated to determine trends in performance. 

Figure 14.3 Trends in normalized data showing effectiveness of membrane cleaning. Note the decline in permeate flow during the first few days of operation due to compaction (see Chapter 14.1.2.2).

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