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Impact of Rhamnolipid/EDDS on Remediation of Compound Heavy Metal Polluted Soil with Growing Ryegrass

Author: ShiFuGui
Tutor: QianYi
School: Xinjiang Agricultural University
Course: Environmental Science
Keywords: heavy metal rhamnolipid EDDS ryegrass soil enzymatic activity
CLC: X53
Type: Master's thesis
Year: 2009
Downloads: 146
Quote: 3
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Abstract


Contamination and remediation of soils are closely related to hot issues in recent years. The purpose of this study was to compare and evaluate effects of different surfactants on mobilization of heavy metals in the soil.The biodegradable biosurfactant rhamnolipid and biodegradable chelator EDDS were compared for their performance in mobilizing heavy metals from soil solid phase into soil pore water. With respect to research on enhanced phytoextration, a pot experiment was conducted. Rhamnolipid and EDDS were applied to the combined polluted soil to evaluate the change of physiological and biochemical properties of ryegrass, the effects on the ryegrass growth, Cu, Zn, Pb and Cd uptake, and soil enzymatic activities. Which could provid theory basis for chemical enhanced phytoextraction and ecologicalenvironment risk evaluation, the main results and findings were summarized as lollowing:In the enhancing of heavy metal in soil treatment, rhamnolipid was more effective than saponin、tween80 and Cyclodextrin to mobilize soil heavy metal into soil pore water. Rhamnolipid and EDDS were combined to applied significantly increased the mobility of heavy metal in soil. Experimental results indicate that Rhamnolipid and EDDS additive exhibit excellent synergistic effect.In the pot experiment, the results showed that 1 g kg-1 rhamnolipid significantly decreased the biomass of ryegrass. Rhamnolipid and EDDS were combined to applied significantly increased heavy metal toxicity to Psysiology and Ecology Effect, and decrease chlorophyll content of ryegrass leaves, Meanwhile, high concentration of heavy metal stress gave rise to injury and destroyed the leafe-defense system.Ryegrass subjected to oxidative stress as heavy metals phytoextration.EDDS had the stronger ability of dissolving heavy metals from soil than rhamnolipid. And Cu, Zn, Pb and Cd concentrations in soil solution and in above-ground part of ryegrass were increased in response to 1 g kg-1 rhamnolipid and 0.4 g kg-1 EDDS addition, respectively. Meanwhile, rhamnolipid and EDDS stimulated soil urease and dehydrogenase activitities. Thus, rhamnolipid and EDDS had great potential in remediation of the combined polluted soil due to their easily biodegradation and relatively low hazard to environment.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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