Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/47303
Title: FORMATION AND RISKS OF DISINFECTION BY-PRODUCTS IN BALLAST WATER CHLORINATION PROCESS
Authors: MA YUE
Keywords: DBPs, Ballast Water, Chlorination, THMs, HAAs, Risk Assessment
Issue Date: 22-Jan-2013
Source: MA YUE (2013-01-22). FORMATION AND RISKS OF DISINFECTION BY-PRODUCTS IN BALLAST WATER CHLORINATION PROCESS. ScholarBank@NUS Repository.
Abstract: This dissertation addresses the formation and speciation of disinfection by-products (DBPs), including four trihalomethanes (THMs) and nine haloacetic acids (HAAs), resulting from chlorination in ballast water treatment. The impact of several variables that influence DBPs formation, such as chlorine dosage, water quality, organic content, temperature, and chlorine contact time or residence time was investigated. The chlorine decay in the chlorination process was monitored and modeled. The potential risk of the formed DBPs to human being and marine environment was evaluated. The levels of DBPs in the chlorinated seawater at the points of discharges were found to be far higher than the drinking water regulated values set by USEPA and WHO. However, they would be well diluted when they are released to the sea. Modeling simulation by MAM-PEC was conducted based on various situations, with the consideration of several physico-chemical and biological processes and interactions. It was demonstrated that the PEC values calculated by the MAM-PEC model were at a safe level in most cases. It indicates that there is no risk to the marine environment caused by the discharged chlorinated ballast water.
URI: http://scholarbank.nus.edu.sg/handle/10635/47303
Appears in Collections:Ph.D Theses (Open)

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