Abstract:

It took three landscape river sections in Xuhui District, Shanghai as an example for the investigation of the distribution and main sources of pathogenic microorganisms in landscape rivers under different weather scenarios. The results showed that the average concentration of fecal coliform was 1.31*10⁵  MPN/100 mL on sunny days and 2.49*10⁵ MPN/100 mL on rainy days with River 1. The average concentrations of fecal coliform in River 2 and River 3 on sunny days and rainy days remained at 10$^{4}$ MPN/100 mL. The average concentrations of coliform were two orders of magnitude in all 3 rivers. River 1 was 3.6*10³ CFU/mL, and River 2 and River 3 were 29 and 98 CFU/mL respectively. On rainy days, the average concentration of coliform was two orders of magnitude as same as that on sunny days. The concentrations of fecal coliform and coliform were increased in both rainfall and rain water pump stations, but the increase of coliform was significantly higher than that of fecal coliform. Clearly, rainfall is one of the main sources of pathogenic microorganisms in landscape river. Although human beings do not usually have direct contact with the landscape rivers, there are still some health risks. It is necessary to strengthen the monitoring and control of the pollution caused by pathogenic microorganisms.

Key words: landscape river, fecal coliform, coliform, pollution sources, distribution characteristics