LC-OCD, which consists of SEC(Size Exclusion Chromatography) of direct injection
mode and high-sensitive organic carbon detector, was used to study the origins and
characteristics of natural organic matter (NOM) of Paldang raw water and evaluate the NOM removal in
a conventional water treatment plant. The Paldang raw water from July 2005 to February 2006
showed pedogenic Fulvic Acid which comes from soil, and from March
2006 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 average
percentage of each constituting material group was 55% for humic substances, 18%
for neutral substances, 10% polysaccharides and 0.4% for small acids. The authors concluded
that July seemed to have the highest Trihalomethanes (THMs) among disinfection byproducts by the
analysis of the SUVA and humic substances. The average NOM removal efficiency of
coagulation and sedimentation using powdered activated carbon (PAC) was 43%, the highest value
among the water treatment processes.
The study confirms that large amounts of humic substances, including biopolymers which
were known as precursor of disinfection byproducts, and some portions of building
blocks and acids could be removed in the coagulation and sedimentation processes.
The removal efficiency through coagulation, sedimentation and following rapid sand
filtration 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.
| Edition : | Vol. - No. |
| Number of Pages : | 38 |
| Published : | 06/01/2007 |
