The application of the sulfur oxidizing bacteria to wastewater including high concentration of nitrate was basically examined by the experiment using artificial wastewater. As a result, the following were clarified.
Sulfur oxidizing bacteria having the denitrification function was acclimated by using artificial wastewater containing only nitrate as a nitrogen source from the activated sludge of the sewage plant in about three weeks This bacteria was able to remove nitrogen from artificial wastewater which included nitrate of 900-1300mg-N·l-1 under the condition of 1.5-3 hours of HRT (The water temperature: 20°C). This sulfur source was thiosulfate and 3.5-4 was suitable in the S/N ratio. As for the acclimated sulfur oxidizing bacteria, the denitrification rate was presumed to be large since it was easy to make self-immobilized and was maintained to be hightly concentrated in the reactor. On the other hand, it was thought that there was a problem in the maintenance management by accumulating sulfur when an excessive high load operation was continued.
硫黄酸化細菌の造粒化と高濃度硝酸性窒素含有廃水への基礎的適用検討
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