佛山水道底泥的污染物释放动态模拟

为定量评价底泥对上覆水水质的影响，给河道底泥整治工程方案的选择提供参考，采用佛山水道的污染底泥以COD、NH3-N和TP为研究对象，进行了污染物释放的动态模拟，并根据试验结果用平均值法计算了底泥污染物的释放量。结果表明，污染程度较高的底泥对上覆水中NH3-N、COD和TP浓度的贡献依次为0．65、4．25和0．067mg／L，分别占Ⅳ类水质标准值的43．3％、14．2％和22．3％。这说明在外源污染被控制后，如果没有采取有效措施抑制底泥污染物的释放，很难使佛山水道的水质达到Ⅳ类标准。

Dynamic Simulation on Release of Contaminated Sediment in Foshan Waterway

In order to estimate the effects of sediment on the quality of the overlying water quantificationally, and offer the references to the choice of possible rehabilitation plans, the simulative experiment has been done. Sediment samples from Foshan Waterway were used as experimental material. The selected parameters include COD, NH3 - N and TP. Based on the preliminary data, the amount of pollutants release was calculated. The results demonstrate that the concentration increment of COD, NH3 - N, and TP in overlying water is 0.65, 4.25 and 0. 067 mg/L respectively, accounting for 43.3% , 14.2% and 22.3% of the class IV of the water quality criteria. This proves that it will be hard to meet the designed water quality goal if the polluted sediment has not been well treated, even if the external pollution sources have been removed.