Influencing Factors of biofilm nitrification in long-distance water pipeline

The long-distance water transfer project alleviates the situation of water supply tension in various parts of China. In the process of raw water transportation, the nitrification reaction will be carried out by microorganisms due to the existence of a pipe wall biofilm, which converts ammonia nitrogen in water into nitrite nitrogen and nitrate nitrogen. Nitrification of pipeline biofilm is affected by many factors, including temperature, dissolved oxygen concentration, nutrient content, type, and concentration of disinfectants. These factors can change the activity, quantity of nitrifying bacteria, and the conversion rate of ammonia nitrogen, which leads to the effect of nitrification.