陰イオン界面活性剤の生分解によるトリハロメタン前駆物質の生成

概要

論文の詳細を見る
Trihalomethanes (THMs) formed by chlorination of precursor substances in raw water, are found in drinking water. They are found at concentration levels higher than those of other organic contaminants. In the present study, the relationship between the formation of THM precursors and anionic surfectants biodegradation was investigated. Three anionic surfectants (LAS, AS and soap), dissolved in river water, were biodegraded under aerobic conditions at incubation temperature of 10°, 20°or 29°C. Except in the case of soap, biodegradation rates were measured by the methylene blue method. To examine the formation of THM precursors by the biodegradation of the surfectants, the incubation solution was chlorinated and THMs thus formed were determined by GC-ECD after solvent extraction. The results were that 1) AS degraded more quickly than LAS regardless of incubation temperature. 2) Higher temperatures caused significant degree of LAS and AS biodegradation. 3) Easily biodegraded surfectants facilitated THMs formation. 4) Maximum formation of THMs was observed for the soap solution regardless of the incubation conditions. It was concluded, therefore, that one THM precursor may be biodegraded products of surfectants when found in river water.
日本衛生学会の論文