The chemistry of saline water chlorination

Vast quantities of natural waters are used by power plants for cooling purposes, This water is chlorinated to prevent slime build-up inside the cooling pipes, is circulated through the cooling system, In order to and eventually discharged back into the water body, the environmental impact of water chlorination, it is necessary to know what chemical compounds are produced and discharged into the assess receiving waters.

To attack this problem, a review of the present state of knowledge of natural water chlorination chemistry was performed, with It was soon noted that there particular reference to saline waters, were many gaps in this knowledge, notably in the lack of acknowledgment of the possible formation of bromochloramines. Some experimental work led to the isolation of the first known pure solution of a N-bromo-N-chloro-amine, namely, methylbromochloramine. Some of the physical and chemical properties of these compounds were characterized, in both concentrated CCI₄ solution and dilute aqueous solution. It was demonstrated that bromochloramines can readily form under conditions of power plant cooling water chlorination, if saline Further experimental work explained the results of previous workers by showing that chlorine losses at very high doses in seawater are simply the result of chlorate and bromate formation which, however, is negligible at normal doses. water is used.

The most important chlorine-produced oxidants, along with the relevant chemical reactions, were chosen as a basis for a kinetic model of saline water chlorination chemistry. Kinetic data were compiled in a computer program which simultaneously solves 24 differential equations, one for each species modelled. Estimates were made for the unknown rate constants, with the hope that measured values would be determined by future researchers. A purely predictive model was not possible due to the great variability in the organic demand; however, the model is applicable under a broad variety of conditions (except sunlight), and it provides a reasonably good description of a halamine chemistry under environmental conditions.