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Membrane separation is based on the component through the functions of selective membrane for separation of As, imposed by both sides of the membrane (or the existence of) one or more of the driving force, so that raw material components of the membrane through a selective priority membrane to achieve separation of the mixture and the product line of sight to extraction, concentration, purification, etc. The purpose of a new separation process.

Driving force 

     Pressure difference (also called transmembrane pressure), poor concentration, potential difference, temperature and poor.
     Such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) are the driving force of micro-differential pressure membrane separation process.

Membrane type and type 

     According to the source material can be divided into natural and synthetic membrane biofilm; by membrane separation process can be divided into the pressure difference driving force, potential difference, the concentration of poor, poor film temperature; by membrane structure can be divided into symmetric and non - two major categories of symmetric membrane, which asymmetric membrane can be broken down into porous membrane, composite membrane and the composite film.