Gas Transfer Membrane

Membrane degassing unit is a system that removes gasses from the liquid and makes possible the direct contact between gaseous phase and aqueous stream without dispersion. The membrane contactor is composed of hydrophobic hollow fibers that don’t allow the aqueous stream to penetrate the pores into the gas side of the membranes.The mass transfer between the two phases is driven by the pressure of the gas phase. Stripping gas is applied to the lumenside (inside) of the hollow fiber, while the liquid stream is introduced outside of the fiber.
The partial pressure of the gas is decreased to remove dissolved gases from the liquid phase.
The sweep-gas flows counter-current to the water flow: because of partial pressure gradient, the target gas is forces to transfer to the lumenside and be swept away. The liquid stream becomes saturated with the sweep gas.

This system has many advantages:
It is modular;
It is not sensitive to flooding, channeling and
It can be operated over a wide range of flowrates;
Simple operation;
Quick start up;
No chemical requirements.

In high purity and industrial applications, Gas Transfer Membranes have become the standard product in order to remove:
CO2 and O2 from boiler feed water to protect boiler and piping from corrosion;
CO2 after RO and before EDI to reduce chemical consumption and optimize EDI operation. Less CO2 improves
  also silica and boron removal;
CO2 between a double pass RO system to reduce chemical consumption and minimize membranes scaling.