AWWA ACE58236

Dissolved organic nitrogen (DON) concentrations in raw and finished drinking waters are thefocus of this paper. The percentage of DON removal during alum coagulation in five natural waterswas comparable or better than dissolved organic carbon (DOC) removal. Approximately 75 % ofDON occurs in the larger than 1000 Daltons fraction. During alum coagulation the > 1000Dalton molecular weight DON was preferentially removed. Significant amounts of DON wereextracted from bacteria. However, bacterial DON removal during alum coagulation was lowerthan removal of surface water DON. DON of wastewater origin had higher removals by powdered activated carbon (PAC)adsorption than non-wastewater impacted drinking waters. Analytical challenges for measuringDON in natural waters where the nitrate fraction of the total dissolved nitrogen is more than 90% must be addressed in future research. As DON affects disinfectant demand, disinfection byproductformation and speciation, and potentially biostability of drinking water, further researchon DON treatability is required. Includes 13 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

11

File Size:

1 file , 280 KB