Oxygen consumption of blue green algae: Evaluation of hydrodynamic condition in the bottle used for BOD measurement and effects of the strength of flow field on the rate of oxygen consumption of microcystis flocs
1999
Adachi, Y. (Tsukuba Univ., Ibaraki (Japan). Inst. of Agricultural and Forest Engineering) | Nemoto, Y. | Kobayashi, M.
In the present study, the rate of oxygen consumption of the Microcystis floc corrected from surface bloom of lake Kasumigaura was measured as a function of mixing strength of the flow field in the bottle agitated by a magnetic stirrer. The strength of the applied flow field was characterized by the rate of energy dissipation per unit mass, epsilon, which was obtained from the rate of rapid coagulation of uniform polystyrene latex particles measured by means of coulter counter. It was found that the rate of oxygen consumption is constant against the strength of flow field for the range 1.0epsilon10(3) (erg/g.s.). With this result, the validity of the method to apply the commercial BOD tester composed of a closed bottle with a magnet stirrer for the measurement of the rate of oxygen consumption of Microcystis floc was confirmed. The obtained result also implied that the aggregation behavior of Microcystis is considered to have little effect on the rate of oxygen consumption
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