Particulate and Organic Matter Fouling of Seawater Reverse Osmosis Systems
Characterization, Modelling and Applications. UNESCO-IHE PhD Thesis
Characterizing bulk organic matter in seawater and bay water by various analytical techniques and linking these measurements with fouling in membrane systems. Furthermore, it aimed for the development of the Modified Fouling Index - ultrafiltration (MFI-UF) at constant flux filtration as an accurate test to measure the particulate fouling potential of a feed water and predict the rate of fouling in reverse osmosis systems.
A new semi-portable set-up has been successfully developed to perform MFI-UF tests at constant flux filtration. A significant effect of the filtration flux on the fouling potential was found. Consequences of this effect for reverse osmosis systems are that the fouling potential at low flux drops dramatically; for ultrafiltration systems it implicates that the rate of fouling increases at high fluxes. The observed effect of flux on the fouling potential has significant implications for fouling potential measurements. Deposition factors in RO systems varied between 0 and 1, depending on location and MFI pore size, which indicates differences in properties of the particles present. Fouling potential results in RO fouling rates of 0.2-1 bar/month depending on the pore size of the membranes used for MFI measurements. The fouling potential of the analysed raw waters is substantially reduced by conventional pre-treatment systems and ultrafiltration: for conventional pre-treatment 37 % - 74 % and ultrafiltration 60 % - 95 %, depending on the location and the MFI pore size.
Table of Contents
1. Introduction; 2. Mapping of organic matter components through liquid chromatography and fluorescence spectroscopy under high ionic strength conditions; 3. Organic foulants in seawater, estuarine and bay sources for reverse osmosis plants; 4. A review of fouling indices used in RO systems; 5. The modified fouling index - ultra filtration - constant flux for seawater applications; 6. Flux effects on cake compression in membrane filtration; 7. Particle deposition in SWRO systems; 8. The role of particles/colloids in SWRO systems - Fouling prediction and validation; 9. Conclusions
Sergio Salinas performed his PhD research in the field of desalination and membrane technology. He holds a university degree in Civil Engineering and two master degrees: in Irrigation, Drainage and GIS and in Water Supply Engineering. He has worked as a sanitary & structural engineer and as a GIS specialist in various projects in Bolivia for more than 3 years. He has over 15 publications in international conference proceedings, peer-reviewed journals and book chapters in the areas of membrane desalination technology and natural organic matter characterisation.