Membrane si procese de membrana In cadrul ... - cttecotech.ro
Membrane si procese de membrana In cadrul ... - cttecotech.ro
Membrane si procese de membrana In cadrul ... - cttecotech.ro
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TIPURILE DE CURGERE IN PROCESELE MEMBRANARE<br />
Colmatarea grupeaza trei fenomene:<br />
• adsorbtia mac<strong>ro</strong>moleculelor la contactul cu <st<strong>ro</strong>ng>membrana</st<strong>ro</strong>ng><br />
• obturarea mecanica a porilor când dimen<st<strong>ro</strong>ng>si</st<strong>ro</strong>ng>unea moleculelor <st<strong>ro</strong>ng>de</st<strong>ro</strong>ng> solut este<br />
ap<strong>ro</strong>piata <st<strong>ro</strong>ng>de</st<strong>ro</strong>ng> cea a porilor<br />
• formarea unui gel datorita cresterii conc. moleculelor <st<strong>ro</strong>ng>de</st<strong>ro</strong>ng> solut la suprafata<br />
membranei.<br />
Reducerea colmatarii se realizeaza prin spalare inversa (contracurent).<br />
Criterii: ⇒ dupa natura lor:<br />
CLASIFICAREA MEMBRANELOR<br />
• membrane naturale<br />
• membrane <st<strong>ro</strong>ng>si</st<strong>ro</strong>ng>ntetice<br />
⇒ dupa tipul materialului:<br />
• membrane polimerice<br />
• membrane anorganice (sticla, metal, ceramica)<br />
• membrane hibri<st<strong>ro</strong>ng>de</st<strong>ro</strong>ng> organic-anorganice<br />
• membrane lichi<st<strong>ro</strong>ng>de</st<strong>ro</strong>ng><br />
⇒ dupa structura:<br />
• <st<strong>ro</strong>ng>si</st<strong>ro</strong>ng>metrice<br />
• a<st<strong>ro</strong>ng>si</st<strong>ro</strong>ng>metrice<br />
• compozite
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