Inactivation of Scrippsiella trochoidea cysts by different physical and chemical methods: Application to the treatment of ballast water

Wang, Zhaohui; Liang, Weibiao; Guo, Xin; Liu, Lei

Inactivation of Scrippsiella trochoidea cysts by different physical and chemical methods: Application to the treatment of ballast water

2018

Wang, Zhaohui | Liang, Weibiao | Guo, Xin | Liu, Lei

Effects of heating, ultraviolet (UV), ultrasound (US), hydrogen peroxide (H2O2) and freshwater, and the combined treatments on inactivation of cysts of Scrippsiella trochoidea and cysts in sediment suspension were studied. Heating was the most efficient way to inactivate cyst germination, and cysts were completely inactivated at 38°C for 5h. UV, US, and freshwater efficiently inhibited but could not completely inactivate cyst germination. Effects of heating, UV, and US on cyst germination decreased for cysts in sediment, and germination rates increased by 6.7–48% compared to the same treatment for cysts without sediment. H2O2 significantly inhibited cyst germination, but complete inactivation occurred at high concentration for long duration (100mg/L, 6d). The combined treatments were more effective, especially the combinations of heating and UV. The results suggested that heating might be a feasible way for ballast water treatment especially after combined with filtration and UV.

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