Schumacher G, Blume T, Sekoulov I
Technical University Hamburg-Harburg, Institute of Wastewater Management, Eissendorfer Str. 42, 21073 Hamburg, Germany.
Water Sci Technol. 2003;47(11):195-202.
Attached algae settlement is frequently observed in effluents of wastewater treatment plants at locations with sufficient sunlight. For their growth they incorporate nutrients and the surface of the algal biofilm accumulates suspended solids from the clarified wastewater. During the photosynthesis process of algal biofilms oxygen is produced while dissolved carbon dioxide is consumed. This led to an increasing pH due to the change of the carbon dioxide equilibrium in water. The high pH causes precipitation of dissolved phosphates. Furthermore an extensive removal of faecal bacteria was observed in the presence of algae, which may be caused by the activity of algae. The experimental results indicate the high potential of these attached algae for polishing secondary effluent of wastewater treatment plants. Especially for small wastewater treatment plants a post connected stage for nutrient removal and bacteria reduction can be developed with the aid of an algal biofilm.
在阳光充足的地方，污水处理厂的出水经常会出现附着藻类的沉降现象。藻类生长过程中会吸收养分，藻类生物膜表面会积累来自澄清废水的悬浮固体。在藻类生物膜的光合作用过程中，会产生氧气，同时消耗溶解的二氧化碳。由于水中二氧化碳平衡的变化，这导致pH值升高。高pH值会使溶解的磷酸盐沉淀。此外，在有藻类存在的情况下，观察到粪便细菌被大量去除，这可能是由藻类的活动引起的。实验结果表明，这些附着藻类在处理污水处理厂二级出水方面具有很大潜力。特别是对于小型污水处理厂，可以借助藻类生物膜开发一个用于去除营养物质和减少细菌的后置连接阶段。
