Change and influence of biofilm proteobacteria in water distribution system

Abstract:

To study the biological stability of drinking water distribution system and the control strategy of microorganism, this paper, based on the actual water distribution system of the southern city, adopted molecular biological methods to analyze three kinds of proteobacteria in biofilms, discussed the interrelationship between biofilm and bacterial regrowth potential (BRP). The results showed that improvement of water quality led to a transformation from gamma proteobacteria dominate (the proportion was 52.14%-77.34%, 51.02%-77.45%, 51.86%-65.99%, respectively) to alpha proteobacteria dominate (the proportion reached 62.56%-91.36%, 75.27%-96.20%, 73.08%-96.76%, respectively), and the biological stability was improved. In addition, the shedding of biofilm, which makes higher nutrient concentrations of water pipe network, promoted the bacteria regrowth and thus has a certain correlation with BRP.