Relationship Between Microbiologic Properties and Short-cut Nitrification and Denitrification in Constructed Rapid Infiltration System

摘要

Shortcut nitrification is determined by metabolism intensity of ammonia oxidizing bacteria(AOB) and nitrite oxidizing bacteria(NOB). In the current study, the relationship between dissolved oxygen and shortcut nitrification process running effect is' mainly discussed, the relationship between dissolved oxygen and biomass and metabolic activity of AOB and NOB is paid insufficient attention. Therefore, to discuss the influence of dissolved oxygen on short-cut nitrification from the perspective of biology, the relationship in the CRI system between the biofilm characteristic and nitric oxide in different wet-dry rates in the short-cut nitration and denitrification process. The results show that when the ratio of wetting-drying-time is 1:1 and pH value is 8, accumulation of the nitrite nitrogen and short-cut nitrification and denitrification are happened in CRI system. The number of the nitrite bacteria is far more than the nitrobacteria. Accumulation of the nitrite nitrogen and short-cut nitrification and denitrification are happened are mainly due to unique structure characteristics and operation mode of the CRI system.