物理及生物技术在密云水库富营养化防治中的应用

为防治密云水库富营养化问题,应用部分物理和生物技术进行现场试验。吸附性材料净水试验后,试验区内水中氮的浓度和磷的浓度比对照区都有所下降,这将对藻类生长所需的营养物质量起到一定的控制作用。水葫芦净化水体试验说明,试验区内水体的总磷和总氮浓度皆低于对照水体的,这将控制藻类生长所需的营养物质量,即控制藻类的生长速度。机械除藻试验后,水中的叶绿素含量比除藻前下降60%~100%。表底层水体交换试验后,试验区内表、中层水体的温度有所下降,温度降低将抑制表、中层水体中藻细胞的繁殖速率,对水华的发生将起到一定的抑制作用。

The application of physical and biological technique for preventing and repairing the water eutrophication in Miyun Reservoir,Beijing

To prevent and repair water eutrophication in Miyun Reservoir, a site experiment was implemented by using physical and biological techniques. The concentrations of the total phosphorus and nitrogen in the experimental site are lower than those in the controlled-experimental site after the sorption experiment and the hyacinth feeding experiment. After the experiment of mechanical removal of algae, the content of the chlorophyll in water is 0～40% of the previous value. The temperature of the surface and middle-level water in reservoir decreased when the bottom water of the reservoir was pumped to the surface. This would control the increase of algal cells in water.