Commercial Desalination Technologies

Abstract

AbstractThe vast majority of commercial desalination systems utilise one of four desalination processes: reverse osmosis (RO), multi-stage flash (MSF), multiple-effect distillation (MED) and mechanical vapour compression (MVC). A small fraction of desalination systems utilise electrodialysis (ED) technology to treat low salinity brackish water. Worldwide, RO desalination systems account for close to 50% of overall capacity. However, in the arid countries of the Middle East, the majority of desalination systems utilise evaporation processes: MSF, MED and MVC. Although, the energy requirement of evaporation processes is higher than that for membrane processes, distillation desalination systems will continue to dominate Middle East markets for some time to come, due to the large base of thermal desalination units, with proven high operational reliability and the convenience of their integration with power plants (dual purpose systems). With the growing trend to privatise the desalination market in the Middle East, the proportion of desalination capacity supplied by RO will increase, due to the better economics of the RO process. In this chapter, an up-to-date review of industrial units has been performed in order to present the most common features of industrial operating units. This review includes typical design parameters, operating conditions and process performances. Moreover the developments that have taken place over the years are presented, along with examples of recent installations and their production capacities, performance parameters and locations.KeywordsReverse OsmosisDuplex Stainless SteelFeed WaterUnit Product CostReverse Osmosis MembraneThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.