Study On The Pollutant Of Point Source And Mariculture Fluxes Flowing Into Jiaozhou Bay

The main rivers which were investigated in September 2008 and October around jiao-zhou Bay were evaluated in terms of the single factor index evaluation method, comprehensive pollution index method and comprehensive trophic state index. As a result, the key pollutants of the rivers are the investment and the main estuarys are analyzed, finally the pollutant flux of point source and the pollutant of mariculture flux of jiaozhou Bay of 2008 are approximately calculated. The conclusions are following:1. Among five rivers around jiaozhou Bay, The severity of pollution in order is haibo river,licun river,moshui river,loushan river and dagu river.2. Five rivers of jiaozhou Bay are extreme-eutrophic.As a result, the eutrophic conditions of rivers around jiaozhou Bay are far serious. Five estuarys of jiaozhou Bay are also eutrophic, in 2008, Eutrophication index value E is in between 8.2-32.8.3. In 2008, the COD,DIN and DIP of point source flux into jiaozhou Bay are 48201.94t/a,11219t/a and 676.88t/a. The main point source of jiaozhou Bay are tuandao Treatment Plant,haibo river,licun river,banqiaofang river,loushan river,moshui river,dagu river and the other. Their COD flux into jiaozhou Bay are 1840.2t/a,7932.9t/a,10539.2t/a,1541.65t/a,9127.86t/a,5862.5t/a,6959.6t/a and 4398.07t/a;Their DIN flux into jiaozhou Bay are 608.32t/a,1986.3t/a,2016.5t/a,330.55t/a,1806.75t/a,1000.6t/a,2609.6t/a and862.32t/a;Their DIP flux into jiaozhou Bay are 6.08t/a,93.1t/a,164.5t/a,20.15t/a,24.5t/a,121.69t/a,135.4t/a and 102.69t/a.4. In 2008,the COD,DIN,DIP of mariculture flux of jiaozhou Bay are 5640.6t/a,205.6t/a and 35.97t/a.Among them, the COD flux into jiaozhou Bay of shrimp,fish and shellfish are 1450.4t/a,796.8t/a and 3393.44t/a;the DIN are 43.6t/a,117.7t/a and 44.3t/a;the DIP are 5.39t/a,23.8t/a and 6.78t/a.5. Since the early of 1990s to 2008, the jiaozhou Bay mariculture COD flux into the sea increased the overall trend, Since 2005,the smooth trend of mariculture COD flux into the sea is stability. In detail, the mariculture COD flux is about 700t/a in the early of 1990s,and then increases quickly to 6000t/a in the early 21st century. Since 2005, it remained 5600t/a.6. Since the early of 1990s to 2008, the jiaozhou Bay mariculture DIN flux into the sea increased the overall trend, Since 2005,the mariculture DIN flux into the sea had shown a downward trend. In detail, the mariculture DIN flux is about 60t/a in the early of 1990s, and then increases quickly to 240t/a in the early 21st century. Since 2005, it remained 200t/a.7. Since the early of 1990s to 2008, the jiaozhou Bay mariculture DIP flux into the sea increased the overall trend, Since 2005,the mariculture DIP flux into the sea had shown a downward trend. In detail, the mariculture DIP flux is about 12t/a in the early of 1990s, and then increases quickly to 42t/a in the early 21st century. Since 2005, it remained 36t/a.