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Title: Integrated UV systems for water disinfection
Keywords: DBPs, drinking water treatment, E.coli disinfection, integrated UV systems, photoreactivation, synergy
Issue Date: 15-May-2009
Citation: MARK GOH VOON WEI (2009-05-15). Integrated UV systems for water disinfection. ScholarBank@NUS Repository.
Abstract: Common disinfectants for drinking water treatment include ultraviolet (UV) irradiation, chlorine and chloramine where each has its advantages and shortfalls. UV provides effective disinfection without disinfection byproducts (DBPs) but lacks a disinfectant residue, leaving the treated water vulnerable to regrowth of microorganisms. Chlorine is an effective disinfectant and provides a disinfectant residue but produces potentially harmful DBPs. Chloramine maintains a stable disinfectant residue with significantly lesser DBPs but is a weaker disinfectant. To ensure effective disinfection while safeguarding the consumer from DBPs, integrated UV systems were investigated. Hydrogen peroxide (H2O2) was added prior to UV to generate hydroxyl radicals for enhanced disinfection. Chlor(am)ine was added following UV to provide additional disinfection and disinfectant residue. Synergy was observed in all integrated UV systems (H2O2/UV, UV/chlor(am)ine and H2O2/UV/chlor(am)ine), with improved overall disinfectant efficiencies. H2O2/UV/NH2Cl was the most ideal integrated system, meeting targeted inactivation of E.coli, suppressing photoreactivation and produced the least DBPs.
Appears in Collections:Master's Theses (Open)

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