底泥微曝气改善城市缓流水体水质的研究

Improvement of urban slow flowing water by micro aeration on sediments

以城市缓流水体为研究对象,研究了底泥微曝气对水体中有机物、氨氮、磷等的去除效果以及对藻类生长的抑制作用和水体表观的影响。研究表明,底泥微曝气可以有效抑制水体中藻类的生长,这与底泥微曝气可以有效降低水体中磷的含量密切相关,但底泥微曝气对有机物、氨氮的去除效果一般。实验初期,底泥微曝气水体浊度与对照实验和对水微曝气相一致,但实验后期,由于对照实验和对水微曝气中藻类大量生长,导致其浊度明显高于底泥微曝气。通过降低曝气量,使得底泥颗粒物质悬浮量、悬浮高度、藻类生长得到控制,致使实验过程中底泥微曝气水体表观良好。

Removal of organic matter, ammonia nitrogen and phosphorus, inhibition of algae growth and the water surface view by sediment micro aeration in urban slow flowing water were investigated. The results show that the micro aeration on the sediments could effectively inhibit the algae growth because of reduction of phosphorus in the water. However, the organic matter and ammonia nitrogen could not be effective removed by the sediments micro aeration. At the experimental beginning stage, turbidity in the overlying water under the micro aeration on the sediments was the same as that under the micro aeration on water and the control. At the latter stage, the turbidity un- der the micro aeration on water and the control was higher than that under the micro aeration on the sediments due to the algae growth. The amount of suspended solids and the height of suspended sediments and the growth of algal could be controlled by decreasing the micro aeration on the sediments, so that the surface water view under the micro aeration on sediments was improved. This technology will be widely used in the restoration of urban slow flowing water, due to economic, operability and coordination with water landscape.