Environmental catalysis and materials

Effects of UV/Ag-TiO2/O3 advanced oxidation on unicellular green algaDunaliella salina: Implications for removal of invasivespecies from ballast water

Donghai Wu , Hong You , Jiaxuan Du , Chuan Chen , Darui Jin


Received April 12, 2010,Revised May 31, 2010, Accepted , Available online

Volume 23,2011,Pages 513-519

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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 e uent was determined. Compared with individual unit processes using ozone or UV/Ag-TiO2, the inactivation e ciency 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 e ciency and chl-a removal e ciency were positively correlated with ozone dose and ultraviolet intensity. The initial total residual oxidant (TRO) concentration of e uent 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.

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