AWWA ACE95093

In this paper, results from three studies are presented examining specific fractions of natural organic matter (NOM) and potential removal by coagulation, the effects of preoxidation on NOM removal and sludge dewatering, and relationships between the NOM molecular size (AMW), its removability, and subsequent sludge dewatering. In this study, NOM was fractionated into six distinct fractions with the hydrophobic and hydrophilic acid fractions being the dominant fractions in waters of southeastern Virginia. Coagulation studies indicated removal occurred from all NOM fractions although uncertainty exists for the removal from the hydrophobic neutral fraction. A pilot study to examine the effect of preoxidation on sludge dewatering showed that sludges generated from the preoxidized raw water generally exhibited better dewatering compared to sludges generated from the same water but without preoxidation. Partial oxidation of NOM is the likely reaction that generally improved sludge dewatering characteristics. Removal of NOM by coagulation was not observed to be influenced by preoxidation.

Product Details

Published:

01/01/1995

ISBN(s):

0898678331

Number of Pages:

26

File Size:

1 file , 1.2 MB