Effect Analysis of Pure Oxygen Aeration for Black and Odorous River

In order to master the actual effect of pure oxygen aeration in the black and odorous river treatment project, only pure oxygen aeration equipment and microbial dosing were operated at the site of a black and odorous river treatment project, and the dissolved oxygen and water quality in the water body were continuously monitored by controlling the equipment shutdown(operation duration) to examine the actual treatment effect. The results showed that pure oxygen aeration could rapidly increase the level of dissolved oxygen in the black and odorous water body, so that the concentration of dissolved oxygen in the water body would rapidly increase to more than 20 mg/L and the decaying rate was in relatively slow level. Besides, dissolved oxygen could still maintain at 2.73 mg/L after four days. The water containing high oxygen concentration from equipment diffused from the water outlet to the downstream, rapidly raising the dissolved oxygen level of the whole river section. During the diffusion process, there was a partial loss rule that caused the dissolved oxygen level of the downstream river section to be slightly lower than that at the water outlet.