Hi, Pat Residual chlorine will be less than 0.5 ppm. will be used to feed an RO unit, drinking water application. Coconut carbon will be used Thanks

Are you sure the consultants have specified the carbon for chlorine removal? Often an RO unit will have a carbon unit installed to remove organic matter in the feed to slow the fouling rate of the membranes. If the carbon is designed for organic removal, then any extra Cl- removal is just an extra. Normally you want to remove the Cl- as close to the RO membranes as possible to minimize the sections of piping that can show biological growth.

If this was my project, I would probably do the carbon first and the bisulfite after, very close to the inlet of the HP pump and ensure the dosing pump is large enough to supply enough bisulfite to remove all of the Cl- and ignore any removal by the carbon.

Published July 12, 2019 06:23 by Pat Stanford, General Manager

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