AWWA MTC57561

The objective of this study was to effectively evaluate pilot-scale membrane process versus pilot-scale granular activated carbon (GAC) and full-scalecoagulation processes with respect to natural organic matter (NOM) removal, by determining an effective pore size distribution (PSD) and aneffective molecular weight cutoff (MWCO) of the above-mentioned three processes. Currently, drinking water treatment processes have beenevaluated in terms of NOM removal only with respect to dissolved organic carbon (DOC) and ultraviolet absorption (UVA). However, it is difficult todetermine which portion of NOM (in terms of molecular weight) is removed by a specific treatment process. Thus,effective PSD concept for NOM removal process was introduced and used to evaluate the efficiency of membraneprocess, as compared to GAC and coagulation processes. Effective PSD and MWCO of a membrane weredetermined from MW distributions of NOM included in feed and treated samples, using the fractional rejectionmethod and a corresponding slope at a certain MW, respectively (Lee et al, 2002); from this method, even GAC andcoagulation processes were revealed to have "effective PSD and MWCO", and can be effectively compared tomembrane processes. MW distributions of feed and treated solutions were measured by high performance size exclusion chromatography (HPSEC) method with UVdetector. For this study, pilot-scale nanofiltration/ultrafiltration membrane and GAC (a filter- adsorber type) plants were set up in a full-scaleconventional water treatment plant in the City of Changwon, Korea. Includes 6 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

03/05/2003

Number of Pages:

5

File Size:

1 file , 930 KB