城市河道底泥释磷的影响因素研究

自制模拟河道,取含磷的河道底泥进行试验,考察了温度、扰动、溶解氧等因素对河道底泥释磷的影响。结果表明,加大换水频率、缩短停留时间可以维持较好的水质,但并不能从根本上降低释磷量;溶解氧水平对底泥释磷的影响较大,低溶解氧水平(0.8 mg/L)下的释磷量是高溶解氧水平(7.2 mg/L)下的3.7倍;扰动(风)是影响底泥释磷的主要因素,有扰动时上覆水的TP浓度是无扰动时的4倍多;释磷强度会随温度的升高而明显增大,在静态条件下,水温为22℃时的TP浓度是8℃时的1.5倍。

Study on Influence Factors of Phosphorus Release from Sediment in Urban Riverway

The sediment from simulated riverway containing phosphorus was studied to investigate the influence of temperature, disturbance and dissolved oxygen (DO) on the phosphorus release from the sediment.The results show that increasing the frequency of changing water and shortening the residence time can maintain good water quality environment, but it does not fundamentally reduce the amount of phosphorus released.The DO levels impact the phosphorus release from the sediment significantly, the a-mount of phosphorus released with low DO of 0.8 mg/L is 3.7 times of that with high DO of 7.2 mg/L.The disturbance is a main factor impacting the phosphorus release from the sediment, the TP concentra-tion with disturbance is more than 4 times of that without disturbance.The intensity of the phosphorus re-lease is increased with the temperature increased, and under static conditions, the TP concentration with temperature of 22℃ is 1.5 times of that with temperature of 8℃.