Upotreba letećeg pepela za adsorpciju flourida
DOI:
https://doi.org/10.5937/zasmat2204395VKljučne reči:
leteći pepeo, adsorpcija, fluoridi, otpadna vodaApstrakt
Odgovarajuće karakteristike letećeg pepela iz termoelektrana čine ga pogodnim adsorbensom za uklanjanje različitih polutanata iz vode i vodenih rastvora. Njegovom valorizacijom i iskorištenjem može se smanjiti upotreba konvencionalnih adsorbenasa. U radu je predstavljen pregled mogućnosti upotrebe sirovog i modifikovanog letećeg pepela za uklanjanje fluorida iz vode i vodenih rastvora, kao i uticaj različitih procesnih parametara (doza sorbenta, kontaktno vrijeme, pH vrijednost, temperatura i drugi) na vrijednost adsorpcionog kapaciteta i efikasnosti adsorpcije korištenog sorbenta. Leteći pepeo se može koristiti kao efikasan sorbent za uklanjanje fluorida, i u sirovom i u modifikovanom obliku, pri određenim optimalnim parametrima procesa. Sirovi leteći pepeo pokazuje bolja adsorpciona svojstva pri izvođenju eksperimenta u koloni nego pri šaržnim uslovima, pri upotrebi veće doze sorbenta i dužem vremenu kontakta, u kiseloj sredini (pH = 2-3). Različiti autori su modifikovali leteći pepeo tretmanom određenim hemijskim sredstvima (HCl, Ca OH)2…) ili sintezom zeolita na bazi letećeg pepela. Modifikacijom letećeg pepela se poboljšavaju njegova adsorpciona svojstva, tako da se u slabo kiseloj sredini (pH = 6), za relativno kratko kontaktno vrijeme (10-30 min), u šaržnim uslovima, postiže značajna efikasnost adsorpcije (~ 90%).Reference
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