生活排水の窒素除去過程で発生するー酸化二窒素

抄録

Potential contribution of nitrous oxide (N₂O) production during wastewater treatment is discussed based on experimental results. Laboratory experiments using artificial substrate showed that N₂O can be produced both innitrification and denitrification of wastewater. Conversion to N₂O was as high as in the order of some tens percent of the applied nitrogen. Favorable conditions for production of N₂O in denitrification are insufficient organic source, low pH and short solid retention time. Low dissolved oxygen, short solid retention time and presence of organic matters can provoke N₂O production in the nitrification process. These conditions are similar to the operational conditions of actual nitrogen removal process.