RESULTS AND DISCUSSION
Following model validation, three test cases, the conditions of which are listed in Table 1, are carried out. These conditions represent three different operational modes of the wastewater treatment plant and the reclaimed water plant. Scenario 1 presents the normal operational conditions for both plants. Under this scenario, the wastewater treatment plant operates normally, with the full discharge capacity of 150,000 m3/d, whilst the reclaimed water plant also operates normally with its full recycling capacity of 60,000 m3/d. As a result, the treated3 wastewater released directly into the Yellow Sea is 90,000 m /d, and the pollutant
concentrations are 16.67 mg/L for CODMn and 10 mg/L for Nitrogen. Scenario 2 presents the conditions that the reclaimed water plant stops working, so that all treated wastewater of 150,000 m3/d is released into the sea, with the same pollutant concentrations as those in Scenario 1. Scenario 3 represents the worst case when the reclaimed water plant stops working, and the wastewater treatment plant operates abnormally. This will result in the wastewater of 150,000 m3/d being released directly into the sea untreated, also with much higher pollutant concentrations: 166.67 mg/L for CODMn and 70 mg/L for Nitrogen.