河川における残留塩素の低減過程に関する現地観測

抄録

Recently in Japan, with the increase of sewage treatment facilities, the treated water discharged to public waters has been also increased. Residual chlorine contained in the treated water has been found to be chronically toxic to aquatic organisms. This paper is intended to clarify the cause of reduction and the behavior of the residual chlorine in river channels. In order to observe a continuous change in the flux of there residual chlorine, we conducted the field survey with water samplings and measurements in the channel with discharged the treated water. According to these results, it has been examined that the residual chlorine in river water has been strongly related to the treated influent water and has been significantly reduced in the daytime due to its solar radiation, and these reduction processes could have been described as the conventional kinetic modellings.