Trihalomethane (THM) reduction in Istanbul water treatment plants

Abstract

This paper describes trihalomethane reduction in an Istanbul drinking water plant. The total THM levels (TTHM) could be controlled by decreasing the post-chlorination doses. After the commencement of the pre-ozonation process, pre-chlorination was terminated and a sudden drop of THM values in the effluent of the plant was observed. A predictive model that gives a good fit to the observed TTHM levels during the 7 months operation of the plant with and without the pre-ozonation process was presented.