Water. desalination + reuse

Water.desalination+reuse Who's Who 2018 SPONSORED ARTICLE T he Middle East and the USA represent the largest consumers of desalinated water in the world and, regardless of the desalination method employed (whether SWRO, BWRO, MSF, MED or a combina - tion of these methods), planning/build- ing a desalination plant is usually a costly investment. The most critical part of the desalination process is the provision of source water to the plant. Numerous stud - ies have evaluated the most cost-effective and efficient method of feeding seawater to desalination plants, and most conclude that an open seawater intake significantly saves on capital and life-cycle costs (CAPEX). An open seawater intake can either be located directly on the seashore or slightly inland, and fed through tunnelled intakes. Many of the plants in the Middle East use tunnelled intakes to benefit from deeper intakes where cooler water is required. (E.g. as source water for power and desalination plants.) Combined intakes providing feed water o‹en handle up to 100 million litres of water per second. Even when dealing with rela - tively clean debris-free seawater, the screen- ing plant at the intake has to remove a considerable amount of material potentially harmful to downstream processes or that could negatively affect condenser heat rates. Case Study: Desalination Plant in the Middle East The project was structured as an inde- pendent water project (IWP) and uses the process of SWRO desalination, drink- ing water output is 250,000 m³/day. Challenge The project included the delivery and installation support of a state- of-the art seawater intake solution to extract the raw water, removing debris to provide highly efficient pre-treat - ment along three main inlet channels. Solution The decision was made to implement the Geiger MultiDisc ® solution; well-known for reliable pre-filtration and its innova- tive design. Installation time, footprint and the concrete structure required are reduced significantly. (See image at the bottom right above). To provide the desalination plant with screened source water along three main inlet channels, 3 Geiger ® Cable-Oper- ated Bar Rake Cleaners were installed for coarse screening, and 3 Geiger MultiDisc ® Travelling Water Screens for fine screening/ filtration. A proven Geiger ® Cathodic Corro- sion Protection System based on impressed current (ICCP) was installed to protect the equipment from galvanic corrosion in sea- water, and minimize MIC (microbial) cor- rosion. These machines typically have a lifetime of more than 30 years. The Division Water Intake Systems of the Aqseptence Group present their robust and innovative Geiger ® screening solutions for efficiently handling jellyfish and other debris Recently, massive jelly fish swarms through- out the Middle East have drawn attention to the importance of a well-designed intake that can cope with large quantities of unu- sual debris. Huge plants mean huge invest- ments, and the respective intake facility is o‹en not the main focus during the design phase. A fully-functioning and 100% reli- able seawater intake that provides screened seawater even in adverse and difficult con- ditions is essential to protect important downstream equipment (condensers and membranes). For over 50 years, the Aqseptence Group and its Water Intake Systems Division has been supplying automated seawater intake screens to major plants across the world. Many of the plants already in operation are fully aware of the Geiger ® , Passavant ® and Johnson Screen ® brands. To keep pace with the changing demands of intake facilities, we are constantly investing in and develop- ing increasingly reliable screens. Our range of Raking screens, Rotating Drum Screens, Travelling Band Screens and MultiDisc ® Travelling Water Screens are the result of decades of experience in this field. Con- forming to rapidly changing legislation and fulfilling the need for safe, reliable and environmentally acceptable equipment has and will always be Aqseptence Group's goal. Seawater Intakes for Desalination Plants by Aqseptence Group/Geiger ® Geiger ® Revolving Chain Screen removing up to 50 tonnes of jelly fish per hour per channel Barka 4 Desalination Plant, Oman Geiger MultiDisc ® Travelling Water Screen Geiger ® Cable-Operat- ed Rake Screens Comparison of Concrete Structure Required for Intake Screening Solution with Geiger Multi- Disc ® Travelling Water Screen (on the far le ) and Conventional Travelling Band Screen

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