Abstract:
Scaling and fouling of membranes are an on-going performance issue for most plants This presentation outlines
innovations in speciality chemicals designed to inhibit membrane scaling and fouling and to clean membranes where
deposition has occurred.
High phosphate waste water reuse RO plant – There is an increasing trend to treat recycled waste water and use it as
a feed supply to RO plant. High levels of phosphate can cause rapid scale formation in the membranes. This paper
discusses phosphate chemistry and field trails of a new antiscalant which overcomes acid dosing.
Sulphate removal membranes – Specialised nano-filtration membranes have been developed for the removal of
sulphate from seawater in offshore wells reducing scale formation and souring in the well-head. The membranes are
subject to barium/ strontium sulphate scaling. This section discusses the processes and products to inhibit scale
formation.
Removing clay from membranes – Clay is a common place foulant and very difficult to remove from membranes.
This section of the paper describes the mechanisms and products developed to effectively remove clay. A number of
case studies are described.
Keywords: reverse osmosis, membrane, scaling, fouling, cleaning, chemicals, antiscalant, waste water, reuse,
reycle,phosphate, calcium phosphate, sulphate removal, SRP, barium sulphate, strontium sulphate, SR90, clay
cleaning, aluminium silicate, hydroxyapatite.
Stephen P. Chesters
Genesys International Ltd. Unit 4 Ion Path, Road One,
Winsford Industrial Estate, Winsford, Cheshire UK, CW7 3RG
Tel +44 1372 741881; E-mail schesters@genesysro.com
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Monday, May 10, 2010
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