Mass Balance for Deposit Calculations

The amount of solute deposit Md on the membranes may be described (using mass balance principles) by 

The concentrate sample is taken after recirculation of the permeate into the cell, and this way the permeate concentration is accounted for in the concentrate. By recirculating the permeate into the ceil, concentration polarisation effects would be reversed and only irreversible deposition measured. This deposit can also be described as loss of solute Ld (as percent of mass in the feed solution) 

Deposition and loss can be calculated for calcium, colloids, and organic carbon as DOC or UV. 

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