To construct an energy saving airflow-controlling system for Doyang sewage treatment plant, the factors affecting airflow of the influent was analyzed in this study. This research analyzed the operation data of Doyang sewage treatment plant for 912 days.
As a result, the key factors deciding the optimum airflow were found to be temperature, F/M ratio, the loading rate of BOD5 and T-N of the influent. Among the factors, the temperature of the influent had the most decisive effect on the aeration volume. The result showed that an increase of 1 °C of the influent requires 45.3 m3/h airflow. Since the factors affected by seasons like flow rate, F/M ratio and MLSS affect airflow required of blowers, and the change of temperature is considered to intensify the change of airflow even more. Therefore, it is preferable to consider flow rate, F/M ratio, MLSS and water temperature altogether than considering only one factor when deciding airflow of blowers.
The results of this research can be utilized as indicators when designing energy saving system for sewage treatment plants.