الفهرس 
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Abstract
In the last decades, controlling trihalomethanes (THMs) formed in water distribution networks (WDN) is one of the most important issues for producing safe drinking water. According to the standards of World Health Organization (WHO) the THMs concentrations must be less than 100 μg/L. In addition, the standards of United States Environmental Protection Agency (USEPA) states that the THMs concentrations have to be under 80 μg/L. Actually, there is a serious challenge in achieving the balance between destroying pathogenic organisms by chlorination and reducing of disinfection by-products (DBPs) such as THMs. from this point of view, the main objective of this thesis is to design WDN to minimize the formation of THMs.