title: Efficiency of the UV/H2O2 process for the disinfection of humic surface waters.
abstract: The efficiency of the UV/H2O2 process for the disinfection of total coliforms and the prevention of bacterial regrowth in humic surface waters were investigated. Inactivation of total coliforms was determined in water samples containing various concentrations ranging from 0-10 mg/L dissolved organic carbon (DOC) of fulvic acid, which were exposed to various doses (68-681 mWs/cm2) of UV radiation in the presence of 0.125 mg/L and 3.000 mg/L of hydrogen peroxide. Disinfection efficiencies of the UV radiation and the UV/H2O2 processes were compared. The results of bacterial inactivation experiments showed that the performances of the UV and the UV/H2O2 (0.125) were comparable whereas the UV/H2O2 (3.000) process showed significant improvement in performance, especially, in highly humic waters. Inactivation coefficient appeared to be almost doubled by the addition of 3.000 mg/L hydrogen peroxide during the treatment of highly humic waters. In contradiction to significant regrowth which occurred in the single UV radiation treatment, residual bacteria following the UV/H2O2 (0.125) and the UV/H2O2 (3.000) treatments were completely inactivated during dark incubation indicating the elimination of possible bacterial regrowth.
authors: Department of Environmental Engineering, Uludağ University, Görükle, Bursa, Turkey. alkan@uludag.edu.tr
authors: Ufuk
authors: U
authors: Alkan
authors: Arzu
authors: A
authors: Teksoy
authors: Ahu
authors: A
authors: Atesli
authors: Huseyin S
authors: HS
authors: Baskaya
mesh_terms: D001578:Benzopyrans / Q000494:pharmacology*; D015169:Colony Count, Microbial; D004203:Disinfection / Q000379:methods; D004755:Enterobacteriaceae / Q000187:drug effects* / Q000302:isolation & purification / Q000528:radiation effects*; D005618:Fresh Water / Q000382:microbiology; D006812:Humic Substances; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000302:isolation & purification / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; D014873:Water Pollutants; D006861:Hydrogen Peroxide; C005023:fulvic acid