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Per Hyenstrand - One of the best experts on this subject based on the ideXlab platform.

Zhu Wei - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Scenedesmus quadricauda on the growth of Microcystis aeruginosa under fluid motion
    Journal of Chongqing University, 2013
    Co-Authors: Zhu Wei
    Abstract:

    In order to reveal the effects of competition of other algae and Microcystis on growth of Microcystis under flow condition before the formation of algal blooms,and the growth of Microcystis aeruginosa is affected by Scenedesmus quadricauda under flow conditions,experiments are conducted by plexiglass ring groove in axenic laboratory.The competition relationship affected by competition parameters,density and specific growth rate of Microcystis are analyzed.The results show that the Microcystis aeruginosa adaptability on flow water is reduced under the competition between Scenedesmus quadricauda and Microcystis aeruginosa,namely,the optimal flow rate in simple and mix culture are 35 cm/s and 5 cm/s respectively.The exponential growth time of Microcystis aeruginosa under mix culture are longer than under simple culture.Microcystis aeruginosa growth are stimulated and its specific growth rate increase by Scenedesmus quadricauda at flow rate from 0 to 25 cm/s,contrary to these results at 35 cm/s.The growth of Scenedesmus quadricauda is slightly inhibited by Microcystis aeruginosa in control group and treatment groups during the experiment.

  • Effect of Water Flow Regimes on Growth of Microcystis aeruginosa
    Environmental Science & Technology, 2012
    Co-Authors: Zhu Wei
    Abstract:

    Interferences of water flow on growth of Microcystis aeruginosa were studied with difference flow regimes such as continuous and intermittent flows of different velocities.The laboratory experiment conducted indicated that,compared with intermittent flow,interference of continuous flow on the algae growing was significantly detectable,and the stress reached maximum at the flow rate of 35 cm/s.On the other hand,algae growing density when affected by intermittent flow was higher than that by continuous flow,which implied that intermittent flow mainly affected the nutrient absorbing ability of algae cells.The experimental study also suggested that the continuously turbulent flow at high velocities could exert mechanical forces onto the algae damaging algal cells;and that the colony formed by Microcystis aeruginosa cells,however,produced a kind of micro-environment which was conducive to the growth of Microcystis aeruginosa.

  • Effects of Water Flow under Different Light Intensity on the Growth of Microcystis aeruginosa
    Journal of Hunan University, 2012
    Co-Authors: Zhu Wei
    Abstract:

    The effects of water flow under different light intensity on the growth of Microcystis aeruginosa were studied to elucidate the mechanism of water bloom.The experiment was conducted at a light intensity of 2 500 lx and 3 500 lx in a small perspex ring groove,which generated water flow under axenic condition and constant temperature and light.The results showed that the adaptation growth time of Microcystis aeruginosa increased,the exponent growth time was extended and the growth ratio was improved by water flow,which directly influenced the density of algae,and that the effects of water flow on the growth of Microcystis aeruginosa were related to light intensity.The light intensity at 2 500 lx was more conducive to the growth of Microcystis aeruginosa than that at 3 500 lx,the optimal water flow was 35 cm/s both for the light intensity of 2 500 lx and 3 500 lx.There were no significant differences among different water flow at the intensity of 2 500 lx.Therefore,there are not significant differences at 3 500 lx.The light intensity requirement was decreased and the efficiency was increased by water flow.

P. Blomqvist - One of the best experts on this subject based on the ideXlab platform.

U. Burkert - One of the best experts on this subject based on the ideXlab platform.

Jianqiu Chen - One of the best experts on this subject based on the ideXlab platform.

  • Toxic Effect of Nano-TiO2 and Nano-Carbon on Microcystis aeruginosa
    Proceedings of the International Conference on Advances in Energy Environment and Chemical Engineering, 2015
    Co-Authors: Ruixin Guo, Yiyun Liu, Jianqiu Chen
    Abstract:

    Keywords:Nano-TiO2, Nano-carbon, Toxic effect, Microcystis aeruginosa. Abstract. To evaluate the environmental safety of the joint action of nano-TiO2 and nano-carbon, Microcystis aeruginosa was used as the model organism to explore the effect of different concentration of nano- TiO2 and nano-carbon on the growth of algae. This experiment suggested that the growth of algae will be changed under different nano-TiO2 or nano-carbon concentrations and then affect the water environment. Therefore ecological and environmental effect of nano-materials should be considered.