Affiliations: State Key Laboratory of Microbiology, Shandong
University, Jinan 250061, China | School of Environment Science and Engineering,
Shandong University, Jinan 250061, China
Abstract: The degradation kinetics of strains P05 and P07 and the degradation
effects of mixed strain on Microcystis aeruginosa were studied. The results
showed that: (1) The degradation processes of strains P05 and P07 on
Microcystis aeruginosa accorded with the first-order reaction model when the
range of Chl-a concentration was from 0 to 1500 μg/L. (2) The initial
bacterium densities had a strong influence on the degradation velocity. The
greater the initial bacterium density was, the faster the degradation was. The
degradation velocity constants of P05 were 0.1913, 0.2175 and 0.3092
respectively, when bacterium densities were 4.8 × 10^5,
4.8 × 10^6, 2.4 × 10^7
cells/ml. For strain P07, they were 0.1509, 0.1647 and 0.2708. The degradation
velocity constant of strain P05 was higher than that of P07 when the bacterium
density was under 4.8 × 10^5 cells/ml, but the
constant increasing of P07 was quicker than that of P05. (3) The degradation
effects of P05 and P07 strains did not antagonize. When the concentration of
Chl-a was high, the degradation effects of mixed strain excelled that of any
single strains. But with the decrease of the Chl-a concentration, this
advantage was not clear. When the concentration was less than 180 μg/L, the
degradation effects of mixed were consistent with that of strain P07.
