Contamination of the Mushim-Cheon and its Countermeasure;II. The Status of the Seasonal and Hourly Contamination of the Water(1989${\sim}$1990)-Temperature, pH, DO, BOD, COD, SS, Turbidity, and BOD Load

무심천(無心川) 수질(水質) 오염(汚染) 실태(實態)와 그 방지책(防止策);II. 계절별(季節別) 및 시간별(時間別) 현황(現況) (1989-1990)-수온, pH, DO, BOD, COD, SS, 탁도 및 BOD 부하량(負荷量)

  • Published : 1991.06.30


In order to disclose the contamination of the Mushim-Cheon by pollutants and to establish the countermeasures, the water samples collected in November of 1989(lst sample), February(2nd), May(3rd) and August of 1990(4th) were analyzed to obtain the following results : 1. The water temperatures of the seasonal samples ranged from 8.6 to 16.2, 8.3 to 25.2, 18 to 26, and 24 to 32$^{\circ}C$, in the 1st, 2nd , 3rd, and 4th samples, respectively. 2. The pHs of all the samples ranged from 6.5 to 8.5. 3. In the 3rd sample, especially, DO was observed to fall down to 0.8 ppm at the downstream of St 13, which is not allowed even for agricultural use. 4. The BOD and COD values in sewers were much higher than those in the main stream, and especially the values of St 14-A reached 107-608 and 176-635 ppm, respectively, which far exceeded the limit of 40 ppm, the allowed value for the discharges from the disposal facilities. The SS value of St 14A ranged from 142 to 1, 900 ppm, which far exceeded the limit of 70 ppm, the allowed value for the discharges from the disposal facilities. 5. It turned out that the water quality of the Mushim-Cheon flowing through Cheong Ju was more worsened at sewers than the main stream, and at the downstream than the upstream of the surveyed area. Accordingly, the sewage disposal plant and the expansion of the disposal facilities are urgently needed.