| Abstract |
| The experiment in which biological wastewater treatment for nitrogen removal needed carbon source to nitrification and denitrification reaction proposed to figure out economical way. In nitrogen removal experiment, energy is provided from Fe oxidation without supplying any carbon source by Paracoccus denitrificans. As the result of culturing the inorganic medium which Fe powder was dispersed, initial concentration of 43 ppm nitrate was removed more than 98% by culturing about 190 hours. The result of three cases in comparison with Fe chip and dispersed cell, immobilized and dispersed cell of Fe powder, and immobilized powder and cell relatively showed the high removal efficiency of nitrate in terms of the form of cell dispersion. When Fe powder and cell were cultured in the tubular reactor by using of immobilized bead, the high concentration of 870 ppm nitrate had been removed more than 75% after 48 hours. The variation of concentration for nitrate and nitrite in the reactor, new culture medium was continuously supplied, showed more than 94% of removal efficiency by dropping nitrate concentration to 3 ppm after culturing for 96 hours. In the experiment, basic data acquired for introduction to autotrophic denitrification method through checking the efficiency of nitrogen removal by Paracoccus denitrificans. |
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| Key Words |
| Denitrification, Autotroph, Fe, Wastewater, Paracoccus denitrificans |
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