Effect of Dechlorination Time on the Halogenated Disinfection by Products in Chlorinated Saline Wastewater Effluents

Due to the deficiency of fresh water resources, many coastal cities around the world may adopt the practice of using seawater for toilet flushing, which leads to saline wastewaters rich in bromide ions During chlorination for inactivating pathogens in saline wastewater effluents, chlorine can react with bromide and organic matter in the effluents to form halogenated disinfection byproducts Because of the toxicity of residual chlorine to aquatic species, chlorinated saline sewage effluents are required to be dechlorinated before being discharged into coastal marine water In this work, by using a powerful precursor ion scan method with ultra performance liquid chromatography/electrospray ionization triple quadrupole mass spectrometry, the effect of dechlorination time on the speciation and concentrations of halogenated disinfection byproducts in chlorinated secondary saline wastewater effluents was assessed