Effects of UV/Ag-TiO2/O3 advanced oxidation on unicellular green alga Dunaliella salina: Implication

• 作 者: Donghai Wu Hong You Jiaxuan Du Chuan Chen Darui Jin
• 机 构: State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 1
• 出 处: 环境科学学报（英文版）
• 发表日期: 2011年3期
• 关键词: ballast water UV/Ag-TiO2/O3 process Dunaliella salina inactivation total residua

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 (chi-a) concentration. Inactivation efficiency and chl-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.