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An efficiency of humic acids (HA) removal from aqueous solutions by complexation-ultrafiltration (COUF) process was investigated. The rejection of commercial HA (Aldrich ...
Desalination 223 (2008)
... to 7, 5 and 2 respectively to produce samples for investigation. The extract was handled by microfiltration (Millipore, Durapore, 0.45 µm). The humic acid content was subdivided into those components by adsorption on Merck LiChrolut solid phase extraction cartridges: RP8 and RP18. Each separated... cartridges: RP8 and RP18. Each separated fraction was characterized by chemical oxygen demand (COD) and RP HPLC. Keywords: Alginite; Humic acids; Fulvic acids; Microfiltration; Analysis 1. Introduction Humic substances (HS) are important components of natural organic matter (NOM) in soils ...
Desalination 163 (2004)
... chemical oxygen demand (CODMn) and the absorbance in ultraviolet at a wavelength of 254 nm. The investigations demonstrated the complete removal of humic acids determined as the UV254 absorbance, and a high removal of colour (93.3%), TOC (93.5%) and turbidity (85.5%). 1. The studies performed t ...
Desalination 162 (2004)
An experimental study of UF membrane fouling by humic acid and sodium alginate solutions: the effect of backwashing on flux recovery
... and the efficiency of the backwashing technique, which is applied in practice to restore membrane flux. In this experimental study commercial humic acid and sodium alginate have been used as model substances representative of natural organic matter and extracellular organic matter, respectively... mechanism. Comparing fouling in both cases it can be inferred that even though sodium alginate fouling is more severe than the one caused by humic acids, it is to a large extent reversible by backwashing. On the contrary, fouling caused by humic acid is characterized by greater and increasing wit ...
Desalination 220 (2008)
Fouling characteristics of membranes with various molecular weight cut-offs (MWCO) were investigated. The effects of the molecular weights (MW) of humic acids and pre-treatment with PAC on membrane fouling were studied. It was found that the hydraulic resistance caused by fouling material ...
Desalination 170 (2004)
Removal of humic acids by continuous electromagnetic treatment followed by electrocoagulation in batch using aluminium electrodes
This work studied the reduction of humic acids (HA) by continuous electromagnetic (EM) treatment followed by electrocoagulation (EC) in batch of synthetic HA solution using two aluminiu ...
Desalination 239 (2009)
Fabrication of a silica ceramic membrane using the aerosol flame deposition method for pretreatment focusing on particle control during desalination
... contact angle, zeta potential, and effective pore size distribution. Membrane performance was evaluated with respect to removal of Suwannee River humic acids and polystyrene particles with different sizes. Both membrane thickness and pure water permeability decreased with increasing sinterin ...
Desalination 238 (2009)
... Humic acids have been widely studied in the literature as a representative to natural organic matter (NOM) in drinking water supplies due to thei ...
Desalination 176 (2005)
... of chemical and biological processes in water technology is very broad. Fig. 7. TOC removal at 42 W/cm2 in function of sonication time and humic acid concentration with (right side) or without (left side) 15 mg/L of nitrate. Some incongruence was measured in respect to absorbance removal and... 15 mg/L of nitrate. Some incongruence was measured in respect to absorbance removal and TOC removal. The effects of ultrasonication on the humic acids could be explained by two mechanisms. One is the chemical degradation of the humic acids in the cavitation bubbles by oxidation. The other is th ...
Desalination 210 (2007)