Journal of Food, Agriculture and Environment

Sterilization effect of 254 nm UV-C irradiation against cyanobacteria Microcystis aeruginosa

Author(s):

Mei Zhu ^{1 *}, Jun Zhang ³, Qingliang You ⁴, Gary S. Bañuelos ⁵, Zengliang Yu ³, Miao Li ^{1, 2, 3*}

Recieved Date: 2014-08-22, Accepted Date: 2014-12-28

Abstract:

Harmful algal bloom (HAB) produced by several cyanobacterial species is a significant threat to many aquatic ecosystems around the world. Recently frequent occurrence of serious algal bloom in Lake Taihu, Lake Dianchi and Lake Chaohu has become a serious concern in China. Although various methods are currently being used to control toxic blue-green algal water blooms, many of their techniques are of limited use. In this study, the use of 254 nm UV-C radiation to control algal growth was evaluated using Microcystis aeruginosa as test species. The UV-C irradiation of more than 99 µW cm^-2 light intensity was found to be lethal to M. aeruginosa. Under incubated conditions with petri dishes and with 20 hours exposure to the UV-C irradiation of 1370 µW cm^-2, almost all the cells settled to the bottom of the incubation Petri dishes, whereas all the unirradiated cells remained in suspension. It was also observed by microstructure and ultrastructure slice-ups that the UV-C radiation had a significant kill and wound effect on algal cells and controlled algal growth. After a UV-C dose of no less than 7.2 J cm^-2, most algae cells dispersed, whereas all the unirradiated cells remained agglomerative.

Keywords:

Harmful algal bloom, blue-green algae, Microcystis aeruginosa, UV irradiation, removal effect

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Journal: Journal of Food, Agriculture and Environment
Year: 2015
Volume: 13
Issue: 1
Category: Agriculture
Pages: 43-47

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