INVESTIGATION OF ODOR GENERATION IN URBAN RIVER BY AN ODOR OBSERVATION SYSTEM

Abstract

 In order to understand the actual odor generation in urban river and to study effective countermeasures, it is necessary to grasp the odor generation in a timely manner, and to link the generation factors with the generation frequency. In this survey, we conducted continuous observation of odor in urban river using a system capable of continuous observation.

 From the observation results, the period when the odor index exceeded the odor index 10 was short, and the frequency of exceeding varied depending on the time. In addition, as a result of sorting out the odor generation factors and the frequency for each factor, it was found that in the investigated river, the odor generated by rolling up and exposure of the sludge when the water level was low was dominant and the occurrence period of phenomenon was short. The results of this survey were obtained by long-term continuous observation of the odor intensity which changes from moment to moment, and it showed that the continuous observation was effective for grasping the actual state of odor generation.