Evaluation of different additives to enhance a pilot scale soil washing process
Laboratory scale soil washing of two lead contaminated soils was evaluated, in order to precede a pilot scale study. A comparison of the desorption capacity of different washing solutions, including pH-adjustment using HNO<,3> or NaOH, citric acid and two synthetic biodegradable chelating agents was made. The results indicate that, besides the conventional acidic wash, the chelating agents have a large removal potential. However, chelating agents are rather expensive and regeneration of these is necessary in order to achieve a cost efficient treatment at larger scale. Using a pH-increase followed by Na<,2>S addition, the removal of metals was studied. Preliminary results indicate that regeneration of the chelating agents is possible, but the required number of cycles might be difficult to achieve. The future perspective of the project is to implement the most promising techniques evaluated here in a pilot scale soil washing equipment, which utilizes approximately 25-50kg. Larger scale studies are not very well studied, wherefore interesting results regarding kinetics and implementation could be assumed.
Desorption heavy metal regeneration soil washing synthetic chelating agent
K. Elgh-Dalgren Z. Arwidsson P. A. W. van Hees
MTM research centre, Orebro University, s-701 82 Orebro, Sweden SAKAB AB, s-692 85 Kumla, Sweden
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
963-964
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）