| Water is the material basis of human's exist and development. Drinking water relates humanity's life and health. Drinking water safety is a global significant strategy. At present, microbiological index is the main hazard in drinking water. Microbiological hazards mainly caused by pathogenic bacteria in water are acute. The diversity of bacteria in water distribution system and identification of pathogenic bacteria have been researched by this paper. The work applies technique support for guarantee water supply secure.Firstly, a simulative distribution network is established in the lab. The water quality of the selected monitoring points is monitored for long time. It comes to the conclusion by the analysis of the experimental data. Water temperature has great influence on HPC and affects other factors of HPC directly or indirectly. The chlorine residual in water is usually to limit bacterial regrowth. There are correlation between turbidity, pH and HPC. But the correlation between TOC and HPC is negative.Secondly, molecular biological technologies are innovationally used in the study of bacteria diversity in drinking water. It's proved that molecular biological technologies are feasible. Because it is unnecessary to culture the microorganisms by traditional methods, it can avoid the situation of losing the microorganisms during the culture. It is useful to protect the security of microbiology water quality, and helpful for ensure the health of people.Thirdly, this paper uses the API reagent piece of France Biomerieux Company to identify the bacteria in the distribution network firstly. Biofilm is studied using Environmental Scanning Electrom Microscopy (ESEM). This is very important for the microbiology water quality research and it's the base of microbiology water quality contamination control.Lastly, the probable polluted reasons and risk of microbe are analyzed. Effective measures about how to control the water quality contamination, reduce the microbiology risk and improve the water quality of the distribution network are brought forward. |
