典型环境因子对沈阳北运河底泥总氮释放的影响

Effects of Typical Environmental Factors on the Release of Total Nitrogen from Sediment of Shenyang North Canal

以沈阳北运河为对象,采用静态模拟的方法,研究上覆水总氮浓度、pH值和温度等典型环境因子对底泥中总氮释放的影响,并采用动力学模型对实验结果进行了拟合分析.结果表明:上覆水总氮浓度和温度对底泥总氮释放过程及释放量影响显著(P<0.05),上覆水总氮浓度越低,温度越高,总氮释放速率常数越大,总氮释放量越多.偏酸性条件下底泥释放总氮量显著低于中性和偏碱性条件(P<0.05).研究结果为沈阳市河流污染控制及黑臭水体治理提供了重要依据.

Taking Shenyang North Canal as the research object,the effects of typical environmental factors on total nitrogen release from sediment were studied by static simulation methods,such as total nitrogen concentration,pH value and temperature in overlying water.The experimental results were fitted and analyzed by dynamic model.The results showed that the total nitrogen concentration and temperature had significant effects on the release of total nitrogen from sediments(P<0.05).With the decrease of total nitrogen concentration in overlying water and the increase of temperature,both the total nitrogen release rate constant and total nitrogen release amount increased.The total nitrogen released from sediment under acidic conditions was significantly lower than that under neutral and alkaline conditions(P<0.05).The results of this study provide an important basis for the pollution control of rivers and the treatment of black and odorous water in Shenyang.