Schumacher G, Sekoulov I
Institute of Wastewater, Technical University of Hamburg-Harburg, Hamburg, Germany.
Water Sci Technol. 2002;46(8):83-90.
The potential in polishing secondary effluent by an algal biofilm composed of different green and bluegreen algae was investigated. During the photosynthesis process of algal biofilm oxygen was produced while dissolved carbon dioxide was consumed. This led to an increasing pH due to the change of the carbon dioxide equilibrium in water. The high pH caused precipitation of dissolved phosphates. The attached algae took up nitrogen and phosphorus during the growth of biomass. In addition to nutrient removal, an extensive removal of faecal bacteria was observed probably caused by adsorption of the algal biofilm and by photooxidation involving dissolved oxygen. The experimental results suggest that a low-cost, close to nature process especially for small wastewater treatment plants for nutrient removal and bacteria reduction can be developed with the aid of an algal biofilm.
研究了由不同绿藻和蓝绿藻组成的藻类生物膜对二级出水的净化潜力。在藻类生物膜的光合作用过程中，产生了氧气，同时消耗了溶解的二氧化碳。由于水中二氧化碳平衡的变化，这导致pH值升高。高pH值导致溶解磷酸盐沉淀。附着的藻类在生物量生长过程中吸收氮和磷。除了去除营养物质外，还观察到粪便细菌的大量去除，这可能是由于藻类生物膜的吸附以及涉及溶解氧的光氧化作用。实验结果表明，借助藻类生物膜可以开发一种低成本、接近自然的工艺，特别是用于小型污水处理厂的营养物质去除和细菌减少。
