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Effects of UV/Ag-TiO2/O3 advanced oxidation on unicellular green algaDunaliella salina: Implications for removal of invasivespecies from ballast water
Authors:Donghai Wu  Hong You  Jiaxuan Du  Chuan Chen  Darui Jin
Affiliation:State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China
Abstract:The UV/Ag-TiO2/O3 process was investigated for ballast water treatment using Dunaliella salina as an indicator. Inactivation curveswere obtained, and the toxicity of e uent was determined. Compared with individual unit processes using ozone or UV/Ag-TiO2, theinactivation e ciency of D. salina by the combined UV/Ag-TiO2/O3 process was enhanced. The presence of ozone caused an immediatedecrease in chlorophyll a (chl-a) concentration. Inactivation e ciency and chl-a removal e ciency were positively correlated withozone dose and ultraviolet intensity. The initial total residual oxidant (TRO) concentration of e uent increased with increasing ozonedose, and persistence of TRO resulted in an extended period of toxicity. The results suggest that UV/Ag-TiO2/O3 has potential forballast water treatment.
Keywords:ballast water   UV/Ag-TiO2/O3 process   Dunaliella salina   inactivation   total residual oxidant
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