A comparative study of ozonation, iron coated zeolite catalyzed ozonation and granular activated carbon catalyzed ozonation of humic acid.
This study compares ozonation (O3), iron coated zeolite catalyzed ozonation (ICZ-O3) and granular activated carbon catalyzed ozonation (GAC-O3) for removal of humic acid from an aqueous solution. The results were evaluated by the removal of DOC that specifies organic matter, UV254absorbance, SUVA (Specific Ultraviolet Absorbance at 254 nm) and absorbance at 436 nm. When ozonation was used alone, DOC removal was 21.4% at an ozone concentration of 10 mg/L, pH 6.50 and oxidation time of 60 min. The results showed that the use of ICZ or GAC as a catalyst increased the decomposition of humic acid compared to ozonation alone. DOC removal efficiencies were 62% and 48.1% at pH 6.5, at a catalyst loading of 0.75 g/L, and oxidation time of 60 min for ICZ and GAC, respectively. The oxidation experiments were also carried out using <100 kDa and <50 kDa molecular size fractions of humic acid in the presence of ICZ or GAC. Catalytic ozonation also yielded better DOC and UV254reduction in both <50 kDa and <100 kDa fractions of HA compared to ozonation.
Sinop University, Directorate of Construction & Technical Works, 57010 Sinop, Turkey. Electronic address: dilek.gumus@gmail.com.
Dilek
D
Gümüş
Ondokuz Mayıs University, Engineering Faculty, Environmental Engineering Department, 55139 Kurupelit, Samsun, Turkey.
Feryal
F
Akbal
D002384:Catalysis; D002606:Charcoal / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods; D017641:Zeolites / Q000737:chemistry*
D006812:Humic Substances; D014874:Water Pollutants, Chemical; D017641:Zeolites; D002606:Charcoal; D010126:Ozone; D007501:Iron
Catalytic ozonation; Granular activated carbon; Humic acid; Iron coated zeolite; Ozone