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Study on Immobilization of Co-contaminated Soils by Heavy Metal Using Clay Mineral

Author: WangChangWei
Tutor: SunYouGuang
School: Tianjin University of Technology
Course: Chemical Engineering
Keywords: Soil Heavy metal Combined pollution Cole In situ immobilization
CLC: X53
Type: Master's thesis
Year: 2010
Downloads: 183
Quote: 0
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Abstract


The main contents of this experiment is in by cadmium, lead-contaminated soil, add variety passivation material (clay minerals, the modified clay mineral, phosphate and compound), through the net chamber pot experiment, the system application of the passivation materials the rape biomass, small rape uptake of Cd, Pb, Cd in the heavy metals in the soil distribution, soil available heavy metal content and soil pH changes, to further investigate the rape plant heavy metal effective state of the relationship of the heavy metal content and soil pH content of the soil, the following main conclusions: 1 by adding a single test of the clay minerals can be seen on rape growth: sepiolite single processing has a significant role; Sea bubble the stone single treatment to reduce the effect of Cd content of rapeseed shoots most significant, sepiolite passivation agent treatment can significantly increase soil pH; passivated of sepiolite single treatment all add a single clay mineral materials to repair the effect of Cd contaminated soil best. passivation repair studies show that sepiolite and other materials complex pairing soil Cd pollution: the increasing effect of the combined treatment and acid-of modified sepiolite single processing significantly better than sepiolite single treatment; passivation material composite processing significant than a single treatment to reduce the effect of rape Cd absorption from passivation effect and economic considerations, 6% of the passivation material add more appropriate; the passivation material composite processing and sepiolite single processing can increase soil pH impact on soil available Cd content than a single value the acid modified sepiolite single treatment on soil pH had no significant effect; the the different passivation material handling could significantly reduce soil available Cd content the passivation material composite processing treatment significantly; the sepiolite and phosphate composite processing passivation repair effect on soil Cd pollution. We further Pb-Cd complex contaminated soil study results show sepiolite and phosphate composite: a single process, and sepiolite phosphate and phosphate compound treatment can significantly improve the Rape shoot and root biomass; treatment to reduce the effect of rape aboveground Cd, Pb content of the most significant and phosphate single treatment to reduce the the rapeseed root of Cd, Pb content works best, sepiolite single treatment to reduce Rape Cd, Pb absorbed the worst effect; different passivation agent treatment can significantly increase soil pH, strong single treatment of sepiolite and sepiolite and phosphate composite processing role; most of the passivation agent treatment can significantly reduce soil available Cd, Pb content; comprehensive comparison seen sepiolite with phosphate composite processing immobilization Cd, Pb effect of compound pollution of soil.

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