A design method of the RO system in reverse osmosis brackish water desalination plants (calculations and simulations)

Abstract

This paper proposes a simple design method of the RO system in RO brackish water desalination plants. This method is based on the application of maximum available recovery without scaling of any of the compounds present in the water as silica, calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, and calcium fluoride, and membrane manufacturer design guidelines, and the plant production. It is a continuation of the paper "A design method of the RO system in reverse osmosis brackish water desalination plants (procedure)" presented at the conference on Membranes in Drinking and Industrial Water Production, Leeuwarden, The Netherlands, 10-12 September 2012. Although the method was originally conceived for application to subterranean brackish waters in the Canary Islands, Spain (principally Gran Canaria, Fuerteventura and Tenerife), it can be extrapolated to other types of region and water treatable with RO systems. The required input data are the chemical composition of the feed water, pH, temperature, SDI, membrane manufacturer design guidelines, and the plant production. The programmed method determines the design of the RO system (arrangement) and the operating pressure so as the quality of the product water for different operating years and different types of the RO elements. The method whose procedure is described graphically and analytically can be used as an aid in design optimization of RO brackish water desalination plants with acid-free pre-treatment processes and by the use of scale inhibitor using spiral wound membranes. Practical applications are presented. Calculations and simulations for different types of feed water and capacities are showed. A comparison between the values obtained by this method and from membranes manufacturer software is shown so as the comparison between these and the real values from different desalination plants.

Recent Desalination Technologies by Hybridization and Integration with Reverse Osmosis: A Review

“…Therefore, they recommended more flexible designs and configurations of BWRO systems, capable to adapt to the most common and average operating conditions of the brackish water used. In that sense, the authors developed a simple design methodology [90] and a computational algorithm that allows a flexible design and more realistic operating conditions for RO systems [91]. This allows the user to see all practical solutions and choose the most suitable one.…”

Scope and Limitations of Modelling, Simulation, and Optimisation of a Spiral Wound Reverse Osmosis Process-Based Water Desalination

“…A complete dynamic model was developed by Lee et al [37] on the basis of the work of Lee and Lueptow , Marriott and Sørensen , and Oh et al [25,38,39]. Lee et al [37] investigated the dynamic features, process design, and operation of the Jeddah large-scaled RO desalination plant with a production capacity of 56,800 m 3 /day that is located in the Kingdom of Saudi Arabia.…”

“…A simple model was invented by Ruiz-Saavedra et al [39] for a SW brackish water RO plant located in Spain. The model included the fundamental operational data of the plant, such as the chemical composition, pH, silt density index (SDI; is expressed as the flux decline calculated by differentiating the initial flux to the flux after a constant time), and temperature.…”

Performance Assessment of SWRO Spiral-Wound Membrane Modules with Different Feed Spacer Dimensions

“…Equations proposed by the membrane manufacturer for pressure losses and PF were used in that work. The same equations were used by E. Ruiz-Saavedra et al [36,37] in their development of a design method for brackish water RO systems. June-Seok Choi et al [38] centered their work around the optimization of two-stage SWRO systems.…”