Abstract
Over the last ten years, reverse osmosis (RO) desalination technique became the most common and popular technology to desalinate brackish and seawater due to its low cost and simplicity. Great efforts have been conducted to reduce the energy consumption in reverse osmosis plants. One of the most efficient techniques is the pressure exchanger (PX) which utilizes the high pressure existing in waste concentrate to pressurize a part of feed brackish or seawater. The present research deals only with a pressure exchanger for brackish water. Such PX was manufactured specifically for the present work from simple materials such as cast iron and plastics to match brackish water technical and financial conditions. Results showed that PX for brackish water has a lower hydraulic efficiency than PX for seawater application. The present ultimate hydraulic efficiency is 25.6% compared to 95% for seawater PX manufactured by ERI (the single manufacturer in the Globe) with a higher mixing rate.
Highlights
The fear is energy recovery devices can potentially limit the flexibility of a brackish reverse osmosis (RO) process because of efficiency losses or flow-rate constraints encountered during off-peak operation
This paper deals with the performance of a local-made pressure exchanger that was fabricated from cast iron and plastics, and its effect on the overall performance of brackish water pumping process
The more rotation speed is the more amount of brackish water can be delivered
Summary
Energy consumption is a key factor which influences the cost of freshwater production in reverse osmosis (RO) process. Low-cost isobaric energy recovery devices moved to the front for brackish RO applications These devices provide greater energy-savings payback and greater operational flexibility than was previously achievable. (ERI) “the only manufacturer of PX in the world” is the most efficient and reliable energy recovery solution on the market for desalination This award-winning family of products is unmatched in the industry and has been widely adopted around the world for seawater desalination projects, both large and small. Guirguis (2011) explained various energy recovery devices such as the Francis turbine, Pelton wheel, turbocharger, recuperator, DWEER and Pressure Exchanger, used in seawater reverse osmosis (SWRO) desalination plants along with case studies associated with each of them. This paper deals with the performance of a local-made pressure exchanger that was fabricated from cast iron and plastics, and its effect on the overall performance of brackish water pumping process. A-Rotor (made from plastics). b- Two end cabs (made from plastics). c- Shell (made from cast iron). d- Two end covers (made from cast iron)
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