Evaluation and comparison of seawater and brackish water pre-treatment

IWA Publishing
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Membrane-Based Desalination: An Integrated Approach (MEDINA), 2011, 1, pp. 33 - 70
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The main objective of WP2 was to conduct a comprehensive evaluation on available pretreatment approaches for seawater, brackish water, and estuarinelbay water for membrane protection and recovery maximization. During the project promising results were obtained by UNlCAL and BGU on MBR as a means for reducing organic content from seawater as a step towards reducing fouling potentiaL It seems that the pretreatment in a MER system is effective at improving the water's quality (removal of TOC and EPS) for further process, but further economical and implemental examinations are necessary in order to adopt this treatment as an alternative pretreatment. The removal of particulate malter and organics from seawater by the use of biofiltration was investigated by UTS. Granular activated carbon (GAC) and anthracite were tested as a filter medium at two different velocities. The filtrate quality was evaluated by measuring the silt density index (SDI), modified fouling index (MFI) and turbidity removal. Both biofilters demonstrated similar behavior in terms of SDI and MFL In addition, fiber filter as pre-treatment of SWRO in terms ofMFI, SDI 10, pressure drop, turbidity and molecular weight distribution (MWD) was investigated with and without precoagulation. Submerged microfiltTation couplcd with physcio-chemical processes such as adsorption on powder activated carbon was investigated as well.
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