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Publisher DOI: 10.3390/w9080580
Title: Impact of powdered activated carbon structural properties on removal of organic foulants in combined adsorption-ultrafiltration
Language: English
Authors: Schulz, Martin 
Bünting, Sönke 
Ernst, Mathias 
Keywords: powdered activated carbon (PAC);ultrafiltration (UF);membrane hybrid processes;NOM-removal;membrane fouling
Issue Date: 3-Aug-2017
Publisher: Multidisciplinary Digital Publishing Institute
Source: Water 9 (2017), 8: 580
Journal or Series Name: Water 
Abstract (english): The impact of structural properties of three commercial PACs as well as two mechanically ground PACs on their efficiency in NOM removal and fouling reduction in combined adsorption-ultrafiltration (PAC-UF) of northern German groundwater was investigated. All PACs showed highest adsorption affinity for medium molecular weight NOM fractions. The meso-pore surface area rather than the total surface area (B.E.T.) mainly governed the extent of NOM removal. However, adsorption of macromolecular NOM fractions, which were found to be the main contributor to total and irreversible fouling, was limited by tested commercial carbons, and no significant mitigation of fouling was achieved by any tested PAC concentration. Lowering the particle size by grinding of the PAC, however, enhanced removal of macromolecular NOM fractions considerably, and fouling mitigation occurred at substantially lower PAC concentrations compared to raw carbons. A larger external surface area probably let to more shell adsorption, a more homogeneous particle distribution on the membrane surface and a better mass transport. In addition, comparison of the adsorption isotherms of raw and milled PACs showed that, due to the grinding of PAC particles, additional inner pores structures became available for NOM adsorption. Results of this study point out that structural properties of PAC dramatically influence the efficiency of combined PAC-UF, which needs to be considered during PAC selection and process design.
DOI: 10.15480/882.1415
ISSN: 2073-4441
Other Identifiers: doi: 10.3390/w9080580
Institute: Wasserressourcen und Wasserversorgung B-11 
Type: (wissenschaftlicher) Artikel
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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