| Title |
Use of the Filamentous Algae Mat Ponds for Reducing the Nutrients of Rural Stream Water |
| Authors |
김완중(Wan Joong Kim),김영철(Young Chul Kim) |
| Abstract |
In this paper, roles and functions of filamentous algae were studied when they were applied for treating rural stream water having relatively low concentrations of nutrients and organics. It was found that predominant species of algae was Spirogyra sp. As these algae grew, it was found that they formed porous, thick and gelatinous mat like a sponge, so that they were not lost into the effluent, which is a main advantage of this algae mat system. Excessive loss of algal particles from oxidation ponds and other modified pond systems has been recognized as one of the most troublesome operational problems. Dissolved oxygen of this system was saturated more than 200 % and pH increased to 10 due to the photosynthetic activity, which are equivalent to normal levels of dissolved oxygen and pH characterized by high rate algal ponds. It was found out that 85 - 95 % of T-N and T-P removal efficiency was obtained within four days of hydraulic residence time. In addition, filamentous algae mat system produced effluent with a very lower level of nutrients than aquatic plant ponds using water hyacinth and reed. Meanwhile, organic matters (COD_(cr)) was not significantly reduced, since the initial concentration was very low. |