Abstract
Characterization and removal of natural organic matter, which is contained in the effluent of slowsand filters, was observed by alum coagulation under various dosages. In addition to non-purgedable dissolved organic carbon (NPDOC), trihalomethanes formation potential (THMFP) and haloacetic acid formation potential (HAAFP) measurement, high-performance size-exclusion chromatography (HPSEC) with ultraviolet/visible and dissolved organic carbon (DOC) detectors was used to characterize the various organic fractions contained in the water before and after coagulation. The results show that alum coagulation could effectively remove hydrophobic aromatic, which forms mainly humic substances. The reduction in THMFP was found to be higher than that of NPDOC and HAAFP under specific alum dosage, and the former was also found to be proportional to the corresponding reduction in the area of hydrophobic aromatic fraction, mostly humic subtances, as obtained from HPSEC chromatogram with peak-fitting.
Highlights
Natural organic matter (NOM) is a complex mixture of heterogeneous organic matter present in natural waters
Disinfection by-products (DBPs), of which trihalomethanes (THMs) and haloacetic acids (HAAs) are the major groups, were formed when NOM reacts with a disinfectant such as chlorine
The source water used in this study was collected from the effluent of the slow sand filters in drinking water treatment plant in Kinmen island, Taiwan
Summary
Natural organic matter (NOM) is a complex mixture of heterogeneous organic matter present in natural waters. NOM affects the performance of the unit processes of water treatment, in addition to the biological stability in drinking water. The amount, character, and properties of NOM differ in waters and depend on the biogeochemical cycles of the surrounding environments. Disinfection by-products (DBPs), of which trihalomethanes (THMs) and haloacetic acids (HAAs) are the major groups, were formed when NOM reacts with a disinfectant such as chlorine. The varying leves of DBPs formation are dependent upon the reactivity of the NOM, chlorine dose, pH, temperature, reaction time, and bromide concentration (Roccaro et al 2008; Han et al 2015). The removal of dissolved organic in drinking water treatment is important for controlling disinfection by-products (DBPs)
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