title: Reducing the formation of disinfection by-products by pre-ozonation.
abstract: The objective of this study is to apply the pre-ozonation process to reduce the formation of disinfection by-products (DBPs). The raw water sample, collected from the Te-Chi Reservoir in central Taiwan, has been polluted by fertilizer. Three types of resins were used to isolate the natural organic matter into seven types of organic fractions. The pre-ozonation was used to oxidize each organic fraction to study the reduction of DBPs of each fraction. Experimental results indicated that the pre-ozonation could reduce the concentration of dissolved organic carbon resulting in the reduction of DBP formation. With the pre-ozonation, 9-54% of DOC and more than 40% of DBPs were reduced. With the analysis of UV adsorption and Fourier transform infrared spectrometer (FTIR), the reduction of A254 and unsaturated functional groups such as aromatic ring and C=C bond containing in the water sample is the major reaction mechanism.
authors.affiliation: Institute of Environmental Science, Tunghai University, Taichung, Taiwan, ROC. cnchang@mail.thu.edu.tw
authors.forename: Cheng-Nan
authors.initials: CN
authors.lastname: Chang
authors.forename: Ying-Shih
authors.initials: YS
authors.lastname: Ma
authors.forename: Fang-Fong
authors.initials: FF
authors.lastname: Zing
mesh_terms: D001578:Benzopyrans / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism; D004202:Disinfectants / Q000378:metabolism*; D006812:Humic Substances / Q000378:metabolism*; D006841:Hydrocarbons, Aromatic / Q000378:metabolism; D057927:Hydrophobic and Hydrophilic Interactions; D010084:Oxidation-Reduction / Q000187:drug effects; D010126:Ozone / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D022882:Trihalomethanes / Q000378:metabolism; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001578:Benzopyrans; D004202:Disinfectants; D006812:Humic Substances; D006841:Hydrocarbons, Aromatic; D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D014867:Water; D010126:Ozone; D002244:Carbon; C005023:fulvic acid