AWWA MTC61155

In literature, natual organic matter (NOM) fouling of ultrafiltration (UF) membranes is described due to the deposition of mostly highmolecular weight organics, bigger than the MWCO-value of the membrane, like polysaccharides. Aformer PWN study indicated that the low molecular weight organics and metal complexes rather thanthe high molecular weight organics were responsible for the acceleration in film formation of theseHMW fractions and, therefore, fouling. In this study bench-scale experiments were carried out toreduce the fouling potential of IJssel Lake water by:removing HMW organics like polysaccharides, with enhanced coagulation, according toliterature;removing LMW organics like acids and humics, with ion exchange, according to hypothesisPWN; and,reducing the negative surface charge of the membrane or using opposite charge to promoteelectrostatic exclusion.The study concluded that the removal of LMW organics (lower then the MWCO-value ofthe membrane) with the same amount of HMW organics leads to a much lower fouling potential thanthe removal of HMW organics alone. The combination of a relatively high positively chargedhydrophilic membrane and the removal of LMW fractions with an anion resin (MIEX) results to ahigh gross flux rate at almost no fouling. However, results have been achieved during a relatively shorttime on bench-scale. Extended pilot research is recommended. Includes 13 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

03/01/2005

Number of Pages:

11

File Size:

1 file , 660 KB