you can try a combination of ...
Published by emilio munoz, PVS GmbH, www.pvs.at - Project Manager
you can try a combination of different technologies for example (safety strainer + Dissolved air flotation + automatic self-cleaning filters at 5/10 micron... if you want a high advanced pretreatment you can use a Ultrafiltration upstream the RO plant.
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It should be noted that UF alone can not have a good effect on NOM removal. See the below link: http://www.ncbi.nlm.nih.gov/pubmed/20698267
Published by Ali Salmani, Process Engineer