Reverse osmosis technology for wastewater reuse

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Reverse osmosis technology has a great potential in the field of wastewater reclamation. A reverse osmosis plant includes the following processes: (1) feed water microfiltration and chemical conditioning, 2) membrane treatment, 3) permeate aeration, neutralization and disinfection, and (4) concentrate (liquid residue) treatment and disposal. The performance of reverse osmosis membranes depends on operating conditions and water quality parameters. Permeate productivity and contaminant removals increase with applied hydraulic pressure. Water quality parameters such as concentration, composition and pH also affect contaminant removal efficiencies. For example, the treatment of a simulated wastewater containing 10mg/L of nitrate with a commercial polyamide-type reverse osmosis membrane resulted in membrane permeates containing approximately 0.05mg/L of nitrate (or 99.5 percent removal) when sodium chloride was the major dissolved solid present in the feed water, and 1mg/L (or 90 percent removal) when sodium sulfate was the predominant component. The removals of weak electrolyte contaminants are affected by feed water pH. For example, the removal of boron by a cellulose acetate-type membrane was reported to be greater than 99 percent at a pH of approximately 11, and less than 30 percent at a pH of 7. The practice of pre-treatment processes such as microfiltration and chemical conditioning can minimize performance deterioration resulting from membrane fouling by inorganic precipitates, organic macromolecules and microorganisms (biofouling).

Original languageEnglish (US)
Title of host publicationWater Science and Technology
Number of pages13
StatePublished - Oct 9 1991
Externally publishedYes
EventProceedings of the International Symposium on Wastewater Reclamation and Reuse - Costa Brava, Spain
Duration: Sep 24 1991Sep 26 1991


OtherProceedings of the International Symposium on Wastewater Reclamation and Reuse
CityCosta Brava, Spain

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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