Research On Microbiological Repairagent Of Microcystis Aeruginosa

The eutrophication problem makes the ecological system structure and functionof water body got damage and degradation,which concerned by many worldwidescholars. In recent years,China’s blue-green algae bloom occurred frequently.Thealgae bloom not only effect ecological landscape, but also is a threat to waterplants’survival and human health. Water ecological restoration is the fundamental way tocontrol the eutrophication of water body and the future development trend.In order tounderstad the growth of eutrophication、algal species and the repairing effect atdifferent concentrations of bioremediation agent dosage, as one of the theoreticalbasis in ecological restoration to repair eutrophic water bodies. Therefore the researchadd microbial remediation agent into eutrophic water and take continuous monitoringof the algal biomass and the water quality index, study deptly of the repair effect.This study use simulation column as a way to control algae growth,study theMicrocystis aeruginosa’s changes on growth curve and biomass under the addition ofbioremediation agent.the results of water quality changes and the effects on algalbiomass were as follows:(1)Microcystis aeruginosa cultured in the laboratory was dosed into theexperimental columns. The dosage of microcystis remediation were added2mg/l、5mg/l and10mg/l respectively. The water quality indexes, such as concentrationgrowth of algae cells、TN and TP was continuously monitored.It was proved that withthe increasing of microbial remediation dosage, the concentration of algae cells, TNand TP were all decreased.Therefore,according to this experimental results,the bestdosage of microbial remediation agents is5mg/l.In the end of experiment, thedecreasing rates of algal concentration、 TN and TP were24%、27%、38%respectively.However,the improvement of10mg/l was not evident than5mg/l.(2)Microbial ecological restoration agent on the effect of algae’s stratifiedprecipitation in eutrophic water. Based on a preliminary understanding of microbialecological remediation agent on algae growth inhibitory effect and the removal ofnitrogen, and phosphorus, add Microcystis aeruginosa with laboratory cultures of inthe period of logarithmic growth phase to the simulation experiment column, andadding5mg/l and10mg/l Microbial remediation agent respectively, continuouslymonitor the water quality indexes such as concentration growth of algae cells、TN andTP. Through the study, in different concentrations dosage of microbial ecological agent that we found with the increase of water depth in the two deep water column,the algae density, concentration of TN and TP in the three layer was decreased.Especially in the dosage of5mg/l, improvement of the quality of experimentalcolumn is obvious.in the same time. lots algaes sink to the bottom of experimentalcolumn, the absolute value of the algae density in the lowest layer accounted for51%of the total. Have a inhibition of Microcystis aeruginosa to float on the water surfaceand becoming algal bloom effectively.(3)Study the effects of inorganic carbon concentration on Microcystisaeruginosa’s growth characteristics. add Microcystis aeruginosa with laboratorycultures of in the period of logarithmic growth phase to the simulation experimentcolumn, and adding3mg/l and30mg/l Na2CO3as the inorganic carbon sourcerespectively.Observe the concentration of algae,pH,chl-a,alkalinity,TN and TP tounderstad in the condition of changing carbonate concentration effects on algalgrowth.Through the study, with the increase of carbonate alkalinity, experimentalwater algae density, pH, chlorophyll-a concentration was increasedrespectively.Therefore, lower carbonate concentration in water can significantlyinhibit the growth of algae andeutrophication.