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Study on Pre-chloramination Process for Control of Disinfection Byproduct

Jie Chen

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Abstract

Chloramine was used as pre-oxidant. The formation and variation rule of disinfection byproduct in chloramination process were studied. It is observed that some level of ammonia nitrogen in raw water can cause the effective reduction in the formation of total trihalomethanes (TTHMs). TTHMs are increased slightly with the rising of chloramines dosage, and no great increase of TTHMs occurs after pre-chloramination of 48 h. With the rising of pH, TTHMs (especially bromine substituted trihalomethane) reduce remarkably, and with the increase of chlorine-nitrogen ratio, the formation of bromine substituted THM is raised greatly. It is believed that it may be caused by the complicated influence of pH and chlorine-nitrogen ratio on the reaction of bromide with chloramines.

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What this paper is about

Chloramine was used as pre-oxidant. The formation and variation rule of disinfection byproduct in chloramination process were studied. It is observed that some level of ammonia nitrogen in raw water can cause the effective reduction in the formation of total trihalomethanes (TTHMs). TTHMs are increased slightly with the rising of chloramines dosage, and no great increase of TTHMs occurs after pre-chloramination of 48 h. With the rising of pH, TTHMs (especially bromine substituted trihalomethane) reduce remarkably, and with the increase of chlorine-nitrogen ratio, the formation of bromine substituted THM is raised greatly. It is believed that it may be caused by the complicated influence of pH and chlorine-nitrogen ratio on the reaction of bromide with chloramines.

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Available abstract

Chloramine was used as pre-oxidant. The formation and variation rule of disinfection byproduct in chloramination process were studied. It is observed that some level of ammonia nitrogen in raw water can cause the effective reduction in the formation of total trihalomethanes (TTHMs). TTHMs are increased slightly with the rising of chloramines dosage, and no great increase of TTHMs occurs after pre-chloramination of 48 h. With the rising of pH, TTHMs (especially bromine substituted trihalomethane) reduce remarkably, and with the increase of chlorine-nitrogen ratio, the formation of bromine substituted THM is raised greatly. It is believed that it may be caused by the complicated influence of pH and chlorine-nitrogen ratio on the reaction of bromide with chloramines.

Key concepts: Chloramination, Chloramine, Trihalomethane, Chemistry, Chlorine, Bromine, Bromide, Environmental chemistry

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