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Environmental Engineering Research 2007;12(5): 224-230. DOI: https://doi.org/10.4491/eer.2007.12.5.224
Change of Molecular Weight of Organic Matters through Unit Water Treatment Process and Associated Chlorination Byproducts Formation
Jinsik Sohn1, Hyosoon Kang1, Jihee Han1, and Yeomin Yoon2
1Kookmin University, Department of Civil and Environmental Engineering, Songbuk-gu, Seoul, 136-702, Korea
2CH2M HILL Korea, Level 18, Gateway Tower, 12-5, Dongja-Dong, Yongsan-Gu, Seoul, 140-709, Korea
Corresponding Author: Yeomin Yoon ,Tel: +82-2-727-6781, Fax: +82-2-727-6782, Email: yeominyoon@hotmail.com
Received: July 8, 2007;  Accepted: October 8, 2007.
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ABSTRACT
The objectives of this study were to evaluate the change of molecular weight (MW) profiles in natural organic matter (NOM) through various treatment processes (coagulation, granular activated carbon (GAC), and ozonation) using high performance size exclusion chromatography based on ultraviolet absorbance and dissolved organic detection (HPSEC-UVA-DOC). In addition, relationships between MW profiles and disinfection by-production (DBP) formation were evaluated. Each treatment process results in significant different effects on NOM profiles. Coagulation is effective to remove high molecular weight NOM, while GAC is effective to remove low molecular weight NOM. Ozonation removes only a small portion of NOM, while it induces a significant reduction of UV absorbance due to breakdown of the aromatic groups. All treated waters are chlorinated, and chlorination DBPs such as trihalomethanes (THMs) and haloacetic acids (HAAs) are measured under formation potential conditions. Both THM and HAA formation potentials were significantly reduced through the coagulation process. GAC was more effective to reduce THM formation compared to HAA formation reduction, while ozonation showed significant HAA reduction compared to THM reduction.
Keywords: NOM | HPLC | SEC | THM | HAA
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