水绵(Spirogyra)的除磷特性及其对微藻生长的抑制作用

Phosphorus removal and the inhibition of micro-algal species growth in the presence of Spirogyra were investigated,aiming at phosphorus removal and the inhibition of micro-algal species growth in eutrophicated water bodies.Inhibition of micro-algal species by Spirogyra was studied with Microcystis aeruginosa,a representative of blue algae,and Scenedesmus as a representative of green algal species.Co-cultivation experiments showed that Spirogyra inhibited the growth of the two algal species and Chlorella species strongly.The poor growth of Microcystis aeruginosa and Scenedesmus may result from the metabolic secretions of Spirogyra or microorganisms accreted with Spirogyra by a series tests,such as Spirogyra co-cultivating with Microcystis aeruginosa and Scenedesmus,culture liquid and filtered culture liquid of Spirogyra affacting growth of Microcystis aeruginosa and Scenedesmus.The experiments were conducted on simulated lake water with a phosphorus concentration of less than 1.6 mg·L-1,and phosphorus was removed efficiently during the growth of Spirogyra.The composition of nitrogen nutrients affected the phosphorus removal efficiency,reaching a maximum when the ratio of NH+4-N to NO-3-N was 3∶7.The changing ratio of inorganic nitrogen to phosphorus during Spirogyra growth showed that phosphorus precipitation,which was induced by an increase of pH,was also an important mechanism for phosphorus removal in addition to assimilation by Spirogyra.The cultivation of Spirogyra,which inhibits micro-algal species growth and removes phosphorus,provides a new method to bioremediate eutrophicated water bodies and to protect raw water resources.