生物脱窒処理栄養源としての廃有機物利用技術の開発

抄録

Waste organic substances were evaluated as an alternative nutrient source for biological denitrification in nitrogenous wastewater. In common, methanol is used as nutrient source for denitrifying bacterium. By using of organic wastewater discharged from steel making plant, substituting this wastewater for methanol is focused. In this study, four kinds of candidate steel industry wastewater were examined. In the first step, water quality analysis was conducted as simplified evaluation. BOD/CODcr was defined as the ratio of biological degradable organic substances to total organic substances, candidate wastewater were evaluated for BOD/CODcr. By this test, three kinds of candidate wastewater were selected. In the second step, continuous biological denitrification treatments were demonstrated. Two kinds of candidate wastewater were significantly effective for a nitrogen removal equivalent to methanol. By the water quality analysis and the continuous treatment test, the selection process of organic wastewater as alternative methanol was facilitated and it made possible to perform in a short period of time.