D. Reif, E. Saracevic, M. Sabic Runjavec, J. Haslinger, H. Schaar, N. Kreuzinger:
"Desorption of Organic Micropollutants from Loaded Granular Activated Carbon";
The loading of granular activated carbon (GAC) is inﬂuenced by the amount of water treated and the concentrations of adsorbates present in the water matrix. Through extraction experiments, we aimed to investigate the total adsorbed mass of eight organic micropollutants by using ethanol as solvent and the maximum possible concentrations, due to the desorption of organic micropollutants, in water. Three diﬀerent drying methods and the impact of the contact time, GAC particle size, and GAC/solvent ratio were investigated. Although no signiﬁcant diﬀerences between the drying methods could be observed, the chosen contact time and particle size had a signiﬁcant impact on the amount of organic micropollutants extracted. Lower GAC/solvent ratios positively aﬀected the extraction yield. The masses extracted in ethanol were compared with the cumulated masses calculated from 72 feed and eﬄuent samples, collected during ﬁlter operation, resulting in extraction yields between 0.5% and 30%. The composition of extracted micropollutants in ethanol reﬂected the concentrations in feed water of the pilot-scale ﬁlter. Desorption in water was mostly inﬂuenced by the solubility of the investigated micropollutants. The same substances found in the supernatants inf the experiments could also be identiﬁed in the backwash water of the ﬁlter.
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