title: Effects of UV/Ag-TiO2/O3 advanced oxidation on unicellular green alga Dunaliella salina: implications for removal of invasive species from ballast water.
abstract: The UV/Ag-TiO2/O3 process was investigated for ballast water treatment using Dunaliella salina as an indicator. Inactivation curves were obtained, and the toxicity of effluent was determined. Compared with individual unit processes using ozone or UV/Ag-TiO2, the inactivation efficiency of D. salina by the combined UV/Ag-TiO2/O3 process was enhanced. The presence of ozone caused an immediate decrease in chlorophyll a (chl-a) concentration. Inactivation efficiency and ch1-a removal efficiency were positively correlated with ozone dose and ultraviolet intensity. The initial total residual oxidant (TRO) concentration of effluent increased with increasing ozone dose, and persistence of TRO resulted in an extended period of toxicity. The results suggest that UV/Ag-TiO2/O3 has potential for ballast water treatment.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. wdh4898@163.com
authors.forename: Donghai
authors.initials: D
authors.lastname: Wu
authors.forename: Hong
authors.initials: H
authors.lastname: You
authors.forename: Jiaxuan
authors.initials: J
authors.lastname: Du
authors.forename: Chuan
authors.initials: C
authors.lastname: Chen
authors.forename: Darui
authors.initials: D
authors.lastname: Jin
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D000460:Chlorophyta / Q000187:drug effects*; D058865:Introduced Species; D016877:Oxidants / Q000378:metabolism; D010084:Oxidation-Reduction; D010126:Ozone / Q000494:pharmacology*; D010777:Photochemistry / Q000379:methods; D012767:Ships; D018030:Silver Compounds / Q000494:pharmacology*; D014025:Titanium / Q000494:pharmacology*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
chemical_list: D016877:Oxidants; D018030:Silver Compounds; D002734:Chlorophyll; C009495:titanium dioxide; D010126:Ozone; D014025:Titanium; D000077194:Chlorophyll A