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Novosti › Reverzna osmoza i RO moduli u akvaristici

Biblioteka: Reverzna osmoza i RO moduli u akvaristici Četvrtak, 27 Januar 2005 (15:59:42) CET
Biblioteka tekstova Postavio Octopus u (9586 puta pročitano)

REVERZNA OSMOZA I RO MODULI


Za separaciju i frakcionisanje organskih i neorganskih supstanci iz avodenih rastvora,
membranski procesi ,reverzna osmoza i ultrafiltracija se sve cesce upotrebljavaju.U samom pocetku oblast primene reverzne osmoze bila je okrenuta desalinizaciji morske vode.Danas RO aparati imaju veoma siroku primenu u medicinske,farmaceutske i mnoge druge svrhe.Izmedju ostalih, primena Ro modula u svrhu pripreme vode ,uplovila je i u akvaristiku .

U slucaju Ro Aparata.osnovna komponenta je polupropustljiva(semipermeabilna) membrana .Na povrsini ove membrane desavaju se sve promene.Pod deistvom pritiska kroz ovu membranu prolazi cista voda dok se ostale komponente smese zadrzavaju.Stepen u kome je voda preciscena zavisi od kvaliteta membrane i radnog pritiska RO postrojenja.(u nasem slucaju primene malih RO aparata ovaj radni pritisak je konstantan, tj,to je pritisak nase vodovodne mreze na koju je ro aparat prikljucen.Akvaristi koriste najcesce uredjaje malih kapaciteta, 90,120, ili nesto malo vise litara dnevno.Ovi aparati obicno ne koriste dodatne pumpe pritiska)
Za reverznu osmozu je karakteristicno da voda pre dolaska na RO modul mora biti prethodno filtrirana (Mehanicki,i hemijski predfilteri su znaci deo aparata)Sami RO moduli(reverzno osmotske membrane) izradjuju se od poliamida,celuloznog acetate i grugih materija.
Veoma brzoj primeni Ro uredjaja u mnogim oblastima doprinele su sledece cinjenice:Formiranje Ro uredjaja je modularno i uvek ostavlja mogucnost prosirenja. Primenom.Ro ne zagadjuje se okolina.Proces je kontinuiran i odvija se izotermno ,a pri tome nema faznih promena fluida koji se na ovaj nacin tretiraju.
Smer proticanja kod RO uredjaja je suprotan smeru(koji bi se odvijao pod istim uslovima ali bez spoljasnjeg hidrostatickog pritiska.)koji je karakteristican za klasicnu osmozu.Ili jednostavnije objasnjeno:Kod klasicne osmoze smer proticanja ide sa mesta viseg ka mestu nizeg hemijskog potencijala dok je kod RO aparata taj smer suprotan.
Procesom RO se otklanjaju :
 Nerastvorne cestice do velicine 5x 10 na minus cetvrti deo milimetra. U procentu od 99%
 Organske Materije cija je molekulska masa veca od 200 – (99%)
 Jednovalentni joni (Na,K Cl,NH3, itd)do 97%
 Visevalentni joni(Ca,Mg,Al,SO4, itd)do 98%
 Pirogene Materije-99%





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