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      • 合成洗劑 生分解 및 環境毒性에 관한 硏究

        朱興珪,崔圭行,吳東植 조선대학교 약학연구소 1990 藥學硏究誌 Vol.12 No.1

        Alkyl benzene sulfonate, Persists for long Periods in stream because of its resistance to biologic degradation. Its biodegradation is varied in the environment. This investigation was undertaken in oder to know the biodegradation of synthetic detergents which are comprising soft and hard form from may to september 1990. The biodegradation by settling, aeration and activated sludge were determined. The reduction rates of ABS were 22.92%, 10.05% by settlings for 5 days at 25℃ and 52.20%, 82.74% by aeration and average rate 90.98% of LAS by the activated sludge processing. When activated sludge Processing is carried out in the 30% of LAS, the significant downfall of the biodegradation rate to 87.59% is caused by the withering up of bacteria activity as the poison of LAS directly affects microorganism. In dealing with the TLm of LAS systemed synthetic detergent during 24 hours has revealed 40 ppm and the TLm during 48 hours has revealed 24 ppm.

      • 榮山湖 下流의 水質汚染에 관한 硏究

        朱興珪,崔圭行 조선대학교 환경연구소 1992 環境公害硏究 Vol.9 No.-

        The investigations of water quality by physico-chemical method were made from september 1988 to september 1989 in the lower part in Lake Yeong San, we could get the results as follows; pH make little difference in all investigation point(7.1∼7.6) This result show that there is no great factors of pH change at lower part in Lake Yeong San. the dissolved oxygen in the water appears as 8.1∼8.6ppm. the above reason is based on the different geographical condition of Yeong San Dam. that is, there are no higher mountain around it, and wide of the Dam is in influence of wind effect so that waving of surface water is big, thus dissolved oxygen increases in the water. BOD and COD make little difference is all point of investigation that is, BOD 2.1∼3.0ppm, and COD 3.01∼4.0ppm. This result showt hat there is no particular outlet source which cause the point source contamination around the Yeong San Dam.

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