Studies On Cyperus Alternifolius For The Removal Efficiency And Enriching Effect Of Water Pollution

Heavy metal contamination has become a major factor on the globalshortage of water resources and the impact of water pollution controlling. Currently,the study of water bioremediation is mainly focused on the phytoremediation toeutrophic waters. This paper selected the Cyperusalternifolius which has been provedthat it has obviously effect on eutrophic waters. By cultivating nitrogen,phosphorusand CODmn in different progresses of eutrophication, to understand theCyperusalternifolius ’ repair ability under different eutrophication treatment. Andadopted the treatment measure to combine single heavy metal pollution withcompound heavy metal, by using ions of cupper (Cu²⁺),zinc(Zn²⁺) and cadmium (Cd²⁺)as the physical stress factors to make a preliminary study of Cyperusalternifolius ’toxic reaction and removal efficiency under the coerce from ions of copper(Cu²⁺),zinc(Zn²⁺) and cadmium (Cd²⁺).ions of cupper (Cu²⁺),zinc(Zn²⁺) andcadmium (Cd²⁺). The main results were as follows:（1）.In three different degrees of eutrophication treatment experiment, theCyperusalternifolius has best removal effect to the总磷,总氮, CODmn in theeutrophic waters.（2）.Under the single heavy metal pollution treatment, by observing theCyperusalternifolius’ two physiological indexes on leaves and roots cadmium andcombining the harm of corresponding symptoms,we find that in a lowconcentration of heavy metals processing,Cu²⁺has the heaviest damage to the leavesof Cyperusalternifolius and Cd²⁺ has the heaviest damage to the roots.In compoundpollution of heavy metals processing, in different combinations,Cd2+has moredamage than other two heavy metals to Cyperusalternifolius’ leaves and roots. Itindicates that in experiment, Cd²⁺has the largest harm of plant in the three kinds ofheavy metal ions（3） single heavy metal effects on chlorophyll content in leaf parasol experiment, withincreasing Cu²⁺content has great influence on the leaf chlorophyll content; in theexperiment on the effect of Cd²⁺on parasol leaf chlorophyll, Cd5, Cd30and CK weresignificantly abnormal, and the difference between Cd15and CK significantly, in thelow and high concentration, the effect of Cd²⁺on the Cyperusalternifolius leaves large,in the concentration effect than the other two major. In the compound heavy metaltreatment effects on parasol leaf chlorophyll, at low concentration the combination process, effect of Cd²⁺and Cu²⁺on leaf chlorophyll content parasol is larger, Zn²⁺minimum; three effect of heavy metals on leaf chlorophyll content parasol trend andheavy metals on parasol leaf damage ratings, explained the different effect of heavymetals on the content of chlorophyll and leaf Cyperusalternifolius specificphysiological injury consistent performance. Determination of malondialdehydecontent in different heavy metal treatment under the Cyperusalternifolius found, threekinds of heavy metal ions can affect Cyperusalternifolius photosynthesis, increase thecontent of MDA. The increase of MDA reduce the amount of weight and chlorophyllcontent showed a reverse trend.（4） Cyperusalternifolius absorb heavy metal ions in liquid culture, enrichment sitemain stem and leaf, and far higher than the heavy metal content in root. Especiallywith Cyperusalternifolius on Cd²⁺absorption is most obvious, always maintain asmall content in root system.Comprehensive test results, Cyperusalternifolius in different concentrations andcombinations of water heavy metal pollution of heavy metal ions have a goodadsorption ability of enrichment. The adsorption capacity of Cd²⁺is obvious, can beused as the first choice of plant Cd²⁺and Cu²⁺pollution in water, but thephytoremediation of Zn_Cu composite pollution water is not suitable for.