重污染河道疏浚程度对底泥中总氮释放的影响

采集正在进行疏浚的河道表层、中层、下层底泥于室内静态条件下进行TN释放试验,研究疏浚程度对具有明显分层现象的河道底泥中的TN释放影响。结果表明:重污染河道底泥的TN释放共分为3个阶段:快速释放阶段,过渡阶段,释放平衡阶段;重污染河道底泥疏浚程度越高,疏浚后底泥TN质量浓度越低,越有利于减少底泥中TN的释放。重污染河道采用水力疏浚仅能去除表层淤泥,底泥TN负荷仍较高。

Impact of dredging on nitrogen release from sediment in seriously polluted river

Based on experiments of nitrogen release using samples taken from the surface,middle,and bottom layers of the sediments of a dredged river under static conditions,the effect of dredging on nitrogen release from layered sediment was examined.The results indicate that the TN release process can be divided into three phases: rapid release,transitional release,and balance release.The more dredging was conducted,the lesser the TN concentration in sediment after dredging,and the greater the reduction of TN releas...