曝气复氧对富营养化水体底泥氮磷释放的影响

采用实验室模拟，研究了曝气复氧对富营养化水体底泥氮磷释放的影响，结果表明，①溶解氧是影响底泥氮磷释放的重要因素，厌氧状态会加速底泥氮磷的释放。②正常条件下曝气复氧可以有效的控制底泥总磷的释放；曝气条件下高pH值无法控制底泥总磷的释放，搅动会对底泥总磷的释放产生轻微的影响，上覆水总磷浓度较高时底泥会发生吸磷现象，而温度则影响较小。③正常条件下曝气复氧可以控制比较封闭水体底泥氨氮的释放；曝气条件下温度对底泥氨氮和总氮的释放影响较大，即温度越高，抑制氨氮和总氮的释放效果越好，且低温会导致底泥氨氮和总氮的大量释放；曝气条件下搅动导致底泥释放更多的氨氮和总氮。

Effect of aeration on release of nitrogen and phosphorus from sediments in eutrophic waterbody

Effect of aeration on nitrogen and phosphorus release from sediments was researched. Results show that dissolved oxygen is the main parameter for controlling the release of nitrogen and phosphorus from sediments, and anaerobic conditions can stimulate nitrogen and phosphorus release from sediments. The release of nitrogen and phosphorus from sediments in eutrophic waterbody could be inhibited by aeration under normal conditions. Under high pH value and oxic conditions, a great deal of phosphorus would be released from sediments. The amount of sediment phosphorus release under the stirring condition was more than the one under still condition. When TP concentration in overlying water was heavy, phosphorus in water would be absorbed by sediments under oxic conditions. The release of ammonia and total nitrogen from sediments would be greatly influenced by temperature. The amount of ammonia and total nitrogen released from sediments under the stirring condition was more than the one under still condition.