Reverse Osmosis Desalination Costs Analysis
Producing drinking water from Seawater became an affordable solution when no reliable source of fresh water is available. The investment costs far from being the most important consideration. Indeed, chemical and electrical consumptions are the driving operating costs.
Depending on the local energy costs, the choice of energy recovery device can be critical. The investment costs is higher with a PX but electrical costs are much lower.
In countries where energy costs are expensive, typically islands with no energy resources, costs savings with a pressure exchanger are more significative.