AWWA ACE65210

LC-OCD, which consists of SEC(Size Exclusion Chromatography) of direct injectionmode and high-sensitive organic carbon detector, was used to study the origins andcharacteristics of natural organic matter (NOM) of Paldang raw water and evaluate the NOM removal ina conventional water treatment plant. The Paldang raw water from July 2005 to February 2006showed pedogenic Fulvic Acid which comes from soil, and from March2006 to June 2006 showed aquagenic Fulvic Acid that comes from algae.The total organic carbon (TOC) values varied in the range from 1.1 to 2.0 mg/L for 1 year. The averagepercentage of each constituting material group was 55% for humic substances, 18%for neutral substances, 10% polysaccharides and 0.4% for small acids. The authors concludedthat July seemed to have the highest Trihalomethanes (THMs) among disinfection byproducts by theanalysis of the SUVA and humic substances. The average NOM removal efficiency ofcoagulation and sedimentation using powdered activated carbon (PAC) was 43%, the highest valueamong the water treatment processes.The study confirms that large amounts of humic substances, including biopolymers whichwere known as precursor of disinfection byproducts, and some portions of buildingblocks and acids could be removed in the coagulation and sedimentation processes.The removal efficiency through coagulation, sedimentation and following rapid sandfiltration was about 10%. BDOC removal efficiencies were in the range from 9 to 20%,which were somewhat low because of short contact time of rapid sand filtration. Includes 16 references, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2007

Number of Pages:

38

File Size:

1 file