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INFLUENCES OF LOW-MOLECULAR-WEIGHT ORGANIC CARBON AND NITROGEN SOURCES ON GROWTH AND INORGANIC NITROGEN REMOVAL BY MARICHROMATIUM GRACILE STRAIN YL28

The effects of low-molecular-weight sugar, organic acid, alcohol, and organic nitrogen, as well as p H on the removal of high-concentration inorganic nitrogen from simulated seawater were investigated by purple sulfur bacteria Marichromatium gracile strain YL28. The results show that high-concentration of nitrate and nitrite could be completely removed from simulated wastewater with strain YL28 when grown on glucose, sodium acetate, and ethanol as the sole carbon source, the removal rate of ammonium reached 93.40%, 84.55%, and 66.63%, respectively. Sodium acetate was the best carbon source for the cell growth. The removal efficiency to ammonium by the strain was apparently decreased in the presence of peptone or urea. The optimal p H for the removal of ammonium, nitrite, and nitrate was in the range of 6.0 to 9.0. These results suggest that strain YL28 is capable of removing high-concentration inorganic nitrogen from mariculture wastewater; and the removal capacity to ammonium with the strain was markedly affected by high-concentration organic nitrogen compounds such as peptone and urea, whereas the removal to nitrite and nitrate kept at a high level. This study would be applicable for treating wastewater with anoxygenic phototrophic bacteria in aquaculture.