Studies on the algicidal properties of an algicidal bacterium Y3-5 and its application
The prevention and control of blue-green algae blooms has always been a highly concerned environmental issue.In this study,a Microcystis aeruginosa algicidal bacterium Y3-5 was isolated from the tail water of an aquaculture pond in Jiaxing,Zhejiang,and was identified as Brevibacillus laterosporus.The algicidal properties of Y3-5 against Microcystis aeruginosa and its algicidal removal effects on algal bloom water bodies were studied.Results showed that the algicidal mode of Y3-5 was mainly by secreting extracellular active substances.Y3-5 presented best algicidal response speed to the algal culture with medium concentration of chlorophyll a(0.25 mg/L),with an algicidal rate of 96.1%±0.88%.The initial cell density increased the algicidal response speed of Y3-5,but had little effect on the final algicidal rate.The optimum pH range of Y3-5 is 7～8 and the algicidal activity is less affected by pH.Y3-5 presented well algicidal performances in each growth period,and had better efficiency in the logarithmic later period and the stable period.The algicidal rate of Y3-5 under the light intensity of 4 000 lux was higher than that under 2 000 lux and dark conditions,reaching 99.8%±0.08%.After adding Y3-5 to the eutrophic water,the algicidal rate reached 86.4%,and the inhibition rate of the dominant algae species,such as Microcystis,Characteria and Fusarium,reached 48.00%,91.07%and 78.41%,respectively.In summary,the algicidal bacterium isolated in this study had high algicidal activity and practical application value,having certain potential in the actual treatment of blue-green algae blooms.
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