CHLORINE DEMAND AND TTHM FORMATION KINETICS - A 2ND-ORDER MODEL

Much effort has been expended in attempting to develop mathematical mo dels for chlorine demand in water and wastewater. Most of these effort s have centered around the use of first-order functions or modificatio ns of first-order functions. Recently there has also been interest in characterizing the formation of total trihalomethanes. These efforts h ave taken on new meaning because of the importance of maintaining chlo rine residuals for microbial protection and concerns over the formatio n of trihalomethanes in drinking water distribution systems. This pape r applies second-order kinetics to describe both of these relationship s, using data collected from a recent collaborative study between the EPA and the American Water Works Association Research Foundation. It d emonstrates that TTHM formation can be characterized as a function of chlorine demand.