An experimental study was conducted to establish the control strategy of an anoxic-oxic sequencing batch reactor system (AOSBR) using a specific feature of N
2O generated during the anoxic and oxic phases. Since NH
4+-N, NO
2--N and gaseous N
2O (GN
2O) were found to disappear simultaneously in the oxic phase, the end point of nitrification may be detected from the GN
2O profile. It was suggested that the stagflation of nitrification and denitrification could be detected by abnormal GN
2O emission in the oxic and anoxic phases. Compared with the conventional indexes of AOSBR, GN
2O has several advantages. First, the regulation of GN
2O emission could be conducted directly, and second maintenance is easier than conventional indexes because the GN
2O monitoring system is more durable than the monitoring system for water quality.
抄録全体を表示