Isolation and Identification of Main Microorganisms in Different Water Systems in Northern Hangzhou, China

Microorganisms in aquatic ecosystems play an important role in the processes like water purification, nutrition regeneration and biochemical circulation. Some microorganisms are also related to human diseases. To analyze the main microorganisms in the water systems in northern Hangzhou, water was sampled from three different rivers for isolation and identification of microorganisms. The highest diversity and quantity of bacterium was found in the rivers in Banshan industrial district, with an average 127 clones in each plate. For the Beijing-Hangzhou Grand Canal and Longshan reservoir, the number was 20 and 7, respectively. Similar trends were also observed for actinomycetes and molds. CCA analysis showed that the microorganism abundance was mostly related to the NO3-N, TP and TN values of water. Totally, 7 bacterium strains were identified, including Bacillus cereus, Escherichia coli., Klebsiella pneumoniae, and so on, which belong to 7 different genera. In an antibiotics sensitivity analysis, all of the 7 bacteria showed sensitivity to tetracycline.