Remediation of Lead Contaminated Soils by Stabilization/Solidification   总被引：2，自引：0，他引：2  

Bilge Alpaslan  Mehmet Ali Yukselen 《Water, air, and soil pollution》2002,133(1-4):253-263

Most available remediation technologies for treatment of heavymetal contaminated soils are very expensive and result in residues requiring further treatment. Stabilization/solidification (immobilization) techniques however, which aredesigned to decrease leaching potential of heavy metals from soil by addition of chemical additives, provide very cost-effective solutions for heavy metal contaminated soils. Thisstudy investigates the most efficient additive for immobilization of lead. To achieve this goal, several leachingexperiments were conducted for mixtures of different additives(lime, activated carbon, clay, zeolite, sand and cement) withartificially Pb contaminated (spiked) soil samples in accordancewith the Toxicity Characterization Leaching Procedure (TCLP) developed by U.S. EPA. Results showed that among the additivestried, activated carbon, clay, zeolite and sand are not very efficient for Pb immobilization. On the other hand, lime andcement are significantly effective in Pb immobilization with 88% efficiency at 1:21 lime:soil ratio and 99% efficiency at1:15 cement:soil ratio, respectively.  相似文献   

Zeta Potential of Kaolinite in the Presence of Alkali,Alkaline Earth and Hydrolyzable Metal Ions     

Yukselen  Yeliz  Kaya  Abidin 《Water, air, and soil pollution》2003,145(1-4):155-168

Electrokinetic remediation is one of the promising subsurface clean up techniques whose efficiency is directly affected by the zeta potential of clay minerals. To determine the factors affecting the zeta potential, in turn, electrokinetic remediation, the zeta potential of kaolinite is determined usingelectrophoretic mobility in the salt and heavy metals ions asfunctions of pH and concentration. The zeta potential of kaolinite ranged from -25 mV (pH 3) to -42 mV (pH 11) in water. The zeta potential of kaolinite became more negativewith increasing pH. The zeta potential of kaolinite was also found to be sensitive to the valence of ions. Results, furthermore, revealed that kaolinite has higher zeta potentialvalues in the presence of NaCl and LiCl than in water. However, the zeta potential of kaolinite decreased with divalent cationssuch as Ca²⁺ and Mg²⁺. The zeta potential of kaolinitewith heavy metal ions such as Cu²⁺, Co²⁺ and Pb²⁺ showed a similar trend, i.e., increase in the concentration ofthese ions caused a decrease in the zeta potential up to neutral pH, then it became positive. In highly basic environments, thezeta potential became negative again, giving two apparent pzcs. One of two apparent pzcs was attributed to kaolinite and the other one to the precipitation of these ions in highly basic solutions (pH ≥ 9).  相似文献