AWWA ACE65112

The changes in the polarity of natural organic matter (NOM) across two watertreatment configurations, conventional treatment (coagulation, flocculation, sedimentationand filtration) and conventional treatment with pre-ozonation and biofiltration wereanalyzed at pilot-scale using the polarity rapid assessment method (PRAM). The pilot planthad two parallel treatment trains, which allowed for the characterization of both processessimultaneously and minimized the temporal variability of the influent water. The use of the polarity rapid assessment method(PRAM) offered the advantage of evaluating variations in NOM character and reactivityunder ambient conditions after filtration. Results showed temporal variations betweenpolarity on the raw influent samples as well as differences in the specific chemistry of theNOM through each treatment. Overall, ozone/biofiltration reduced non-polar and polarNOM, whereas the effect of conventional treatment varied between samples. In somecases, the changes in polarity caused by conventional treatment produced NOM of similarpolarity to the ozone/biofiltration train. Ozonation was shown to decrease thehydrophobicity and increase the polarity of NOM. These results suggest the influent NOMvariability should be considered and monitored as these changes result in differences inNOM removal and reactivity. Includes 36 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2007

Number of Pages:

16

File Size:

1 file , 1.2 MB