Abstract: A simulation system was designed for river sediment resuspension. Four different aeration turbulent intensity working conditions and one static control were set up. Flow velocities under different turbulent intensities and their dissolved oxygen concentrations were measured. The Reynolds number （Re） of each condition was calculated. The migration and transformation behaviors of four nitrogen forms (ammonia, nitrite, nitrate and total nitrogen in overlying water and pore water from fluid mud layer and black layer) were analyzed. The results showed that DO concentration distributed with various aeration turbulent intensities, which lead different transformation pathways of occurrence of endogenous nitrogen .Under the condition of 28.8~32.0 cm/s flow velocities and 1 810~2 113 the Reynolds numbers, ammonia and total nitrogen in overlying water exhibited better removal efficiency, indicating that turbulent intensity played a significant role in the transformation process of endogenous ammonia and total nitrogen. Compared with static control regime, areation made the fluid mud layer have a higher nitrite and nitrate concentration, it may diffuse to overlying water and black layer. The diffusion nitrite and nitrate in black layer should adopt denitrification or anaerobic ammonium oxidation pathways to remove endogenous nitrogen under hypoxia or anaerobic condition.

Key words: malodorous river, endogenous nitrogen, water turbulence, migration and transformation, Reynolds number