MEMBRANES REVERSE OSMOSIS TDS

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Abstract

It is well established that energy recovery is technically and economically feasible in reverse osmosis (RO) desalination systems, but it is not that clear in brackish water RO system designs. Is there a room for energy recovery device (ERD) in the brackish water RO application or is it a worthless investment? The feedwater quality for usage in industrial systems is getting worse. Higher total dissolved solids (TDS) brackish waters sourced from harbors, high salt wells, or wastewaters are becoming the only available sources for systems that treat water for industrial use. Energy costs are also increasing. Under these circumstances, the inclusion of an energy recovery device in a brackish water RO system becomes more and more economic. However, a sound technical and economical analysis is required in order to make the right decision based on the actual site conditions. The reject (concentrate, also called brine in desalination RO processes) of the RO systems has high pressure, which will be uselessly dissipated in a flow-control throttling valve if not used as a source of energy for usage within the system.

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