Types of Membrane Modules
Membrane modules are broadly classified into cased types, where the membrane is housed in a casing, and non-cased types, where the membrane is not housed in a casing.
Types of cased membrane modules include pleated and spiral types using flat membranes, tubular types using tubular membranes, monolith types using monoliths, and cylindrical types using hollow fiber membranes.
Cased membrane modules can use microfiltration membranes, ultrafiltration membranes, and reverse osmosis membranes. Filtration is generally performed by pressurizing the feed liquid with a pump.
Non-cased membrane modules are generally used by immersing the module in a tank. Filtration is performed by reducing the pressure on the permeate side or by utilizing a water head difference.
Types of non-cased membrane modules include sheet and rotating flat types using flat membranes, tubular types using tubular membranes, and sheet and cylindrical types using hollow fiber membranes.
Non-cased membrane modules generally use microfiltration membranes and ultrafiltration membranes.
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