식물플랑크톤의 종분포와 현존량의 수질에 대한 지표성을 이용하여 수원시 하수종말처리장 주변수역의 6개 정점을 선정하여 식물플랑크톤의 식물상을 밝히고, 특히 주로 특정 서식처에 분포하는 종을 조사함으로써 조사 수역의 오염 정도를 조사하였으며, 또한 계절별 현존량을 측정하여 하수종말처리장 주변수영의 오염정도와 연중 변화에 대하여 측정하였다. 본 연구 결과는 Engler의 분류체계에 따라 정리한 결과 4문 4강 11목 6아목 22과 2아과 54속 155종 20

6～13 ㎎/L base water concentration on monthly BOD has been kept at the Geukrak bridge point for this research target and it indicates the water quality under the existed rank. Due to this present condition of water quality, the demage of ecology from the upper stream to the lower one of the bridge could be conjectured. Moreover, nonstructural extinction of the ecology seems to have gotten worse between both the streams of Yeoungsan River. On this research, eco-corridor between the upper stream and the lower stream of the river should be ensured, the ecological demage needs to be cut off, a dispersed discharge method which the existed method of the 1st sewage plant in Gwangju was enhanced to should be inducted for the procuring of various water ecosystem, and the conditions by the scenario suggested from this research could be applied to a water quality model. then, analysis the improvement effect of the water quality adjacent the river. From the test result, Case3-Type1 scenario is thought to be the best one. From the test result with Case3-Type1, when the concentrated discharge was never done, 0.07 mg/L of BOD concentration was increased at the lower stream where Yeoungbon B point (Haksan Bridge) is but the water improvement effect of 0.24～2.87 mg/L is thought to have been done at the area of water deterioration.

This study aimed to obtain the relative formula with the unit treatment cost according to the treatment of a sewage plant in the service area under highway. The following results were obtained. The correlative formula connected to amount of sewage(Q)generation was as follows ; between an annual amount of sale(C) showed Q=19.113·C0.9294, and between the number of users(P) showed Q=2×10-8·P2 - 0.0298·P + 75,666. The correlative formula connected to the treatment cost was as follows ; according to the amount of sewage generation showed S= 3×10-6·Q - 0.2266·Q + 29,895, according to the elimination of BOD(E) showed S= 6×10-5·E2 - 0.6717·E + 27,744, accoding to the annual amount of sale showed S=0.0005·C2 - 4.8013·C + 35,118, with the number of persons(P) using the service area showed S= 2×10-8·P2 - 0.046·P + 48,803.