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본(本) 연구(硏究)는 대구시(大邱市)의 주요 하천(河川)인 이천(梨川), 범어천(汎魚川), 칠성천(七星川), 신천(新川), 달서천(達西川) 및 공단천(工團川)의 오염상태(汚染狀態)를 조사(調査)하여 도시하수(都市下水)의 효과적(效果的)인 처리(處理)와 금호강(琴湖江)의 오염방지책(汚染防止策) 수립에 필요한 기초자료(基礎資料)를 제공(提供)코자 하였다. 시기별(時期別) 각(各) 하천(河川)의 pH, DO, COD, 질산염 및 인산염을 분석(分析)한 결과(結果)는 다음과 같았다. 1) 각(各) 지점별(地點別) 평균치(平均値)는 pH 7.3~8.2, DO 흔적~6.5ppm, COD 20.4~116.9ppm, T-N 23.2~31.7ppm, -N 18.3~27.7ppm, -N 0.08~1.89ppm, -N 0.19~1.51ppm, -P 2.50~17.28ppm이었다. 2) 지점별(地點別) 오염도(汚染度)가 가장 높은 곳은 공단천(工團川)이었으며 12개월(個月)동안의 평균치(平均値)는 pH 8.2, DO 흔적, COD 116.9ppm, T-N 23.2ppm, -N 18.3ppm, -N 1.89ppm, -N 1.51ppm, -P 17.28ppm이었다. 3) 시기별(時期別)로 비교(比較)하면 pH, DO, COD, T-N, -N의 함량(含量)과 pH는 겨울철이 여름철보다 높았으며 -N and -P의 함량(含量)은 여름철이 다소 높았다.
Water polution status of urban streams in Daegu city were observed to provide the basic information for the effective purification of urban sewage and the conservation of Keumho river. Periodically, pH, DO, COD, nitrate and phosphate of water were investigated at Yee cheon, Bm cheon, Chilsung cheon, Dalseo cheon and Kongdan cheon. The results were as follows. 1) The ranges of average values of analyzed components for 12 months at six sampling sites were pH 7.3-8.2, DO trace-6.5ppm, COD 20.4-116.9ppm, T-N 23.2-31.7ppm, -N 18.3-27.7ppm, -N 0.08-1.89ppm, -N 0.19-1.51ppm, -P 2.50-17.28ppm. 2) At Kongdan cheon, the most heavily polluted site, average values of components were pH 8.2, DO trace, COD 116.9ppm, T-N 23.2ppm, -N 18.3ppm, -N 1.89ppm, -N 1.51ppm, -P 17.28ppm. 3) The values of pH, DO, COD, T-N and -N at winter urban streams were higher than those at summer urban streams. And the values of -N and -P were more or less higher at summer urban streams.
