吊兰和蝴蝶梅对污泥中重金属的去除效果

采用盆栽土培方法,将剩余污泥与供试土壤按质量比为0∶3,1∶2,2∶1和3∶0配比,吊兰和蝴蝶梅栽培幼苗,定期测定植物的株高、根长、干重、鲜重等生物量和叶绿素与根活力变化,以及植物体内Cu、Zn、Cd、Pb和Cr等的重金属含量变化;测定种植前后植物根系旁污泥中的重金属含量和重金属的EDTA提取含量等结果表明,吊兰对多种重金属具有很好的耐性,受重金属影响不大.吊兰对Cr和Zn的富集效果较好,对Cr的富集系数在某个特定的生长期是大于1,且它对Zn的富集效果较稳定,不易受重金属浓度的影响.由于吊兰具有生物量大、根系发达、生物量增长迅速等优点,其有利于被重金属污染的土壤改良.而蝴蝶梅因为根系不发达和生物量较小等原因,对重金属的耐性不强,生长中易受重金属影响,因此不宜用于修复污染土壤的植物.图9,表5,参7.

The removal of heavy metals in sludge pot Chlorophytum comosum and Geranium

the method of potting soil culture, the excess sludge and in accordance with the quality of the tested soil than for the 0： 3, 1： 2, 2：1 ratio and 3： 0, and big flower of bracketplant geranium planting seedlings, on a regular basis to determine the plant height, root length, plant dry weight and fresh weight and other biomass and chlorophyll and root activity, and Cu in plant, zinc, Cd, Pb and Cr content change of heavy metals; Determination of the heavy metal content in plant by plant roots before and after the sludge of heavy metals and EDTA etc. The results showed that the extract content of bracketplant to a variety of heavy metals have very good patience, little affected by the heavy metals. Braeketplant of Cr and zinc enrichment effect is good, enrichment coefficient of Cr in a particular phase is greater than 1, to concentrate of zinc and its effect is stable, not easily influenced by the concentration of heavy metals. Be- cause the bracketplant has large biomass, root developed, advantages of biomass is growing rapidly, its benefits by heavy metal pollution of soil improvement. And big fish pelargonium because root underdevel- oped and biomass, the smaller of heavy metal tolerance is not strong, grow easily affected by the heavy metal, therefore, should not be used to repair contaminated soil plants. 9figs. ,Stabs. ,Trefs.