Desalination

Sep-Pro Systems designs and manufactures two types of desalination units.

1. Multi-effect evaporators (MEE) for seawater or brines
2. Reverse osmosis (RO) units for seawater desalination

Multi-effect evaporators are used to concentrate and reduce the volume of waste water produced in the oil field by converting it to distilled water through a series of stages or "effects." 75% of oilfield brine volume can be distilled to potable water depending on concentration. Waste heat from engines, gas turbine exhaust, or other sources is usually used in place of expensive energy sources.

Reverse osmosis is typically used for seawater desalination and for predictable process separations such as cooling tower make-up and food process separations. Overcoming the osmotic pressure and hydraulic resistance can require pressure from 700-900 psig. For seawater desalination typically a 30-40% permeate (potable water) recovery is possible. The RO membranes are very susceptible to fouling and multi-media filters; ultra filtration is usually required. Periodic membrane flushing is necessary. RO is not recommended to treat water produced from oil fields.

Multi-effect evaporation is cost-effective, using four to six effects when waste heat is available. Brackish water is more treatable with MEE than RO because of unpredictable total dissolved solids (TDS) composition and concentration. However, MEE is more expensive than RO for conventional seawater desalination.

Sep-Pro Systems designs the necessary feed water intake, pretreatment filter, multi-effect or reverse osmosis evaporator and concentrate disposal systems.

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