Abstract

Masan Bay is a typical enclosed coastal sea and receving body of discharges from Masan city and Changwon city. A POTW(Publicly Owned Treatment Works) started operation from November 1993 when the population of drainage area increased abcent 1.0 million and the effluent from this Plant has being discharged to the enclosed sea where is located at 15km distance from inner Masan Bay. Thus the inflow pattern to Masan Bay has been changed. The main objective of this research is to evaluate the relationship between urban wastewater discharge and water qualify change in a typical coastal zone. It is necessary a) to evaluate the change of input loadings, b) to determine the effect on water quality changes, and c) to find the respective importance of improvement options that must be controlled in the wastewater treatment plant. It was concluded that the sea water quality has being adversely affected by the discharge of insufficiently treated urban wastewater and the nutrient removal in wastewater treatment was very important and urgent.

국내에서 가장 전형적인 폐쇄성 해역인 마산만은 연안도시인 마산시와 창원시의 배수지역이다. 유역인구가 약 100만명으로 증가된 시점인 1993년 11월에 마산시 덕동하폐수종말처리장이 가동되기 시작하였으며, 그 유출수는 마산내만에서 약 15km 떨어진 옥계해역에 방류되기 시작하였다. 본 연구에서는 마산만 유입부하의 분포가 어떻게 변화하였으며, 유입부하량과 유입오염물질의 성상은 어떠한 가를 규명하였다. 또한 마산만 유입부하 특성의 변화가 폐쇄성 연안 수질에 어떠한 영향을 주고 있는가를 연구하였다.

Keywords

• enclosed coastal sea;
• inflow pattern;
• wastewater discharge;
• nutrient removal