纯氧曝气在黑臭河道治理中的应用效果研究

Effect Analysis of Pure Oxygen Aeration for Black and Odorous River

为掌握纯氧曝气在黑臭河道治理工程中的实际效果,在某黑臭河道治理工程现场仅运行纯氧曝气设备及适当微生物投加,通过控制设备关停(运行时长)对水体溶解氧及水质进行连续监测以了解其实际处理效果。结果表明:纯氧曝气能快速提升黑臭水体溶解氧水平,使水体溶解氧浓度快速提升至20 mg/L以上且衰减速率较慢,4 d后仍能维持在2.73 mg/L。设备高浓度含氧水从出水口向下游扩散,迅速提升全河段溶解氧水平,在扩散过程中,存在部分损失导致下游河段溶解氧水平略低于出水口处规律。

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.