Abstract
For water service, it is an important issue to control and to reduce the chlorine residuals concentration during water transmission and distribution process. Especially water supply with receiving tank carries considerable risks due to its long residence time owing to the random water use for a small congregation.
Utilizing data from examinations on water quality of small receiving tanks, the purpose of this study is to devise a simulation model for the decrease of chlorine residuals concentration in tank with intermittent inflow and outflow. By the combined use of the first order reaction rate reflected from the TOC components and the model for complete mixing of inflow and stored water in tank, we were able to describe the chlorine residuals decrease under some conditions concerning the turnover rate of receiving tank and/or the reduce of chlorine residuals concentration in inflow.
