鹿児島市内河川水及び下水中のABS系合成洗剤(MBAS)濃度

概要

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Much interest has been focused on organic pollutants in aquatic environments, because such pollutants are significant from the viewpoints of health and of eliminating water pollution. Synthetic detergents constitute one group of these pollutants. The author investigated the quality of water in the main rivers and of sewage in the city of Kagoshima. Chemical analyses were made for synthetic detergent (MBAS), BOD and DO.Detergent concentrations in river water investigated were approximately 1ppm in downstream areas. These values showed a considerable increase when compared with the trace amounts detected in 1962. This increase is a result of the marked increase in the domestic use of synthetic detergents in recent years. BOD values in river water were 0.6∼13.6ppm and a positive correlation (r=0.82) was found between the detergent concentration and BOD value for each sample.Detergent concentrations in raw sewage and secondary effluents were 8.2±1.4ppm and 0.14± 0.04ppm, respectively. These concentration levels are about twice those of 1962. Detergent removal by sewage treatment processes were calculated to effect about 98%, and therefore, high levels of biodegradablity of detergents in activated sludge were assumed.
日本衛生学会の論文