A versatile approach for combined algae removal and biofouling control in seawater reverse osmosis (SWRO) desalination systems

  • Abdullah Alshahri

Student thesis: Doctoral Thesis


The goal of this study was to evaluate the feasibility of using advanced coagulation with Fe(VI) in coagulation-flocculation-sedimentation/ flotation systems for the pretreatment of SWRO desalination plants during algal bloom events. Algal organic matter (AOM) material extracted from marine diatom species (Chaetoceros affinis) was added to Red Sea water to mimic algal bloom conditions. Low dosage of Fe(VI) ( 88% compared to the use of Fe(III) in the pretreatment process. The use of Fe(VI) reduces the operational and maintenance cost in SWRO desalination plant by 7% and the production cost by 4%. This study proved that the use of Fe(VI) during high turgidity and algal bloom conditions helped providing high raw water quality to the RO process with lower chemicals and operations cost as well as low chlorine and iron residuals.
Date of AwardFeb 2021
Original languageEnglish (US)
Awarding Institution
  • Biological, Environmental Sciences and Engineering
SupervisorNorEddine Ghaffour (Supervisor)


  • RO Desalination
  • Pretreatment
  • Ferrate
  • Algal blooms
  • Coagulation
  • DAF

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