Water Quality Impact Assessment of Future Songdo Sewage Treatment Plant using Korean Water Quality Index

This study aims to estimate the water quality impact in future Songdo city's waterfront area by the sewer from Songdo STP (Sewer Treatment Plant). 3D numerical model, MIKE 3 FM was setup and used to analyze the water quality with respect to the gate operation which will be constructed at the ends of the Songdo canal. The model has computed the changes of the water quality under annual duration. Real measured data from Incheon coast was used and WQI (Water Quality Index) estimated the polluted water from land inflow which comes from Songdo city. BOD, Nitrogen and phosphorous parameters coming from land are increased and influence the water quality at Sondo canal. WQI analyzed based on the water quality simulation, the degree shown 3~5 in Songdo canal. That is higher polluted value than the coastal area. Especially near the STP, WQI increased by the polluted water from Songdo STP.