A solution of taste and odor problem with activated carbon adsorption in drinking water: detailed kinetics and isotherms
[ X ]
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Desalination Publications
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, 2-methylisoborneol (2-MIB) and geosmin (GSM) adsorption pathways on steam-ac-tivated wood-originated powder activated carbon were investigated. Firstly, EN 12903 analysis was carried out, giving information about the activation, origin, and suitability of usability as an adsorbent in drinking water treatment plants of activated carbon, and it was found that it was activated by steam, was of wood origin, and suitable for the basic requirements for the adsorption of 2-MIB and GSM. A series of experiments including contact time, the concentration of metab-olites, initial pH of the solution, and dosage of activated carbon were performed on raw surface water samples. Many kinetic and isotherm models known in the literature have been applied to explain the 2-MIB and GSM adsorption on powdered activated carbon (PAC). As a striking feature of the isotherm models, it was concluded that the multilayer physical and/or chemical adsorptions of 2-MIB (R2 = 0.636) and GSMBET(R2 = 0.777) occurs on the macro and mesopores BET of PAC, the adsorption capacity of PAC is higher for 2-MIB (kF = 0.146, qe = 0.9904) than for GSM (kF = 0.023, qe = 0.9252), and the adsorption of GSM (RL = 0.970) and 2-MIB (RL = 0.951) on PAC are reversible. Among the kinetic models, the pseudo-second-order model was found to be the most successful in describing the adsorption of 2-MIB and GSM on the PAC. According to the pseudo-second-order kinetic model, the chemical or physical adsorption situation is not in equi-librium. Therefore, the intraparticle diffusion model applied to find the adsorption mechanism shows that 2-MIB and GSM are physically adsorbed on the external surface of the PAC in the first 16 min, and diffusion from macropores to meso and micropores occurs during the next 74 min. More time is needed for the adsorption to reach equilibrium.
Açıklama
Anahtar Kelimeler
Activated Carbon, Adsorption, Geosmin, Isotherms, Kinetics, Methylisoborneol, Odor, Taste
Kaynak
Desalination and Water Treatment
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
252
Sayı
-
