The effect of preozonation on the control of trihalomethane formation
- Kyoto Univ. (Japan)
A study was made to obtain a better understanding of the manner in which preozonation affects trihalomethane (THM) formation with respect to humic acid, citric acid, and 11 aromatic compounds which were components of humic acid, all in dilute aqueous medium. Ozonation before chlorination is able to not only decrease, but also increase the concentrations of THM precursors. The compounds which are inherently high THM precursors, such as resorcinol, aniline, salicylaldehyde, phenol, and p-hydroxybenzoic acid, are controlled with respect to the increase in the amount of ozone consumed, but the compounds which have essentially no or a low potential for chloroform formation, such as hydroquinone, salicylic acid, methoxybenzene, benzaldehyde, and benzoic acid, produce their maximum THM levels at a certain value of ozone consumed. When 1 mg of organic carbon consumes more than 8 mg of ozone, THM formation from the tested aromatic compounds is depressed by ozone. Aliphatic carbonyl compounds which are the products resulting from the ozonation of aromatic compounds are not significant THM precursors. The preozonation of humic acid is not as effective in reducing its THM formation potential (THMFP) as when simple aromatic compounds are treated. However, the organic materials in the effluent from a biological treatment process usually have a high THMFP, in comparison with organic compounds which are contained in raw wastes. Therefore, there is a limitation in the effectiveness of utilizing biological treatment to remove the precursors of THM.
- OSTI ID:
- 5646832
- Journal Information:
- Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States), Vol. 8:2; ISSN 0191-9512
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CITRIC ACID
OZONIZATION
HUMIC ACIDS
AQUEOUS SOLUTIONS
CHLORINATION
METHANE
ORGANIC HALOGEN COMPOUNDS
OZONE
ALKANES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DISPERSIONS
HALOGENATION
HYDROCARBONS
HYDROXY ACIDS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
SOLUTIONS
320603* - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Public Utilities- (1980-)