Effects Of Fe～(3+) Concentration On Microcystis Aeruginosa Growth And Microcystin Production

The serious eutrophication of water body in rivers and lakes results in frequent breaking out of water blooms, and causes bad influence to people. In our country the preponderant strain is microcystis aeruginosa and they produce microcystin, which can cause health problems in animals and humans. It is an urgent task to research the effects of growth and production microcystin of microcystis aeruginosa under different environmental factors and control water blooms. The environmental factors such as temperature, illumination, ferrite, air current and carbon dioxide current were studied in different reactor to determine their effects on the growth, chlorophyll concentration and microcystin-LR concentration of microcystis aeruginosa.The results indicated that: microcystis aeruginosa in conical flack grew well under the condition that temperature was 25℃, light intensity was 30μmol/(m·s), biomass and the amount of chlorophyll reached the maximum when Fe concentration was 100μmol/L and the maximum production of microcystin-LR was obtained at 10μmol/L Fe³⁺. The microcystis aeruginosa in photobioreactor grew well under the condition that light intensity was 30μmol/(m²Â·s), air current was 0．5 L /min, the effects of biomass, chlorophyll and microcystin-LR concentration of microcystis aeruginosa under different Fe³⁺ concentrations in photobioreactor have the same result with in conical flack. Microcystin-LR concentration increased with the amount of air current or CO₂ current rising.