Electrodialytic Removal of Heavy Metals from Different Solid Waste Products
Electrodialytic Removal of Heavy Metals from Different Solid Waste Products
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电渗析去除不同固体废物中的重金属
DOI：
10.1081/ss-120018809
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Ribeiro
中科院分区：
文献类型：
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作者：
L. Ottosen;Iben V. Kristensen;A. J. Pedersen;H. Hansen;A. Villumsen;A. Ribeiro
今天必须处理各种重金属污染的废物。电化学修复污染土壤的方法已得到发展。其中一种方法是电渗析修复方法，该方法是基于土壤基质内重金属离子和离子种类的电迁移，以及用离子交换膜将土壤和重金属集中的工艺溶液分离。对于某些土壤，如钙质土壤的修复，有必要添加增强液。室内实验表明，柠檬酸铵可用于去除含25%碳酸盐的土壤中的Cu和Cr。修复后各元素的最终浓度均低于目标值。电渗析修复方法是否可以用于其他废弃物的处理？初步实验表明，该方法可用于浸渍木材废料、秸秆燃烧粉煤灰和城市生活垃圾焚烧粉煤灰中不同重金属的脱除。在以草酸为增强剂的7天试验中，废木材中Cu、Cr、As的去除率均在80%以上，效果最好。在处理过程中，草灰中Cd的去除率为66%，而粉煤灰干物质的溶解率为64%。在这个实际实验中，没有使用增强溶液，但这将是必要的，以避免如此高的灰分溶解。以柠檬酸铵为增强剂，对垃圾焚烧后的飞灰进行强化处理，在14 d内脱除了62%的Cd、53%的Cu、6%的Pb和31%的Zn。因此，初步结果有望将电渗析方法发展到土壤以外的其他产品，尽管需要进行更多的研究，特别是为每种产品找到最佳的增强方案。
A variety of heavy metal polluted waste products must be handled today. Electrochemical methods have been developed for remediation of polluted soil. One of the methods is the electrodialytic remediation method that is based on electromigration of heavy metal ions and ionic species within the soil matrix, and a separation of the soil and the process solutions, where the heavy metals are concentrated, with ion exchange membranes. For remediation of some soils, such as calcareous soils, it is necessary to add an enhancement solution. It was shown in a laboratory experiment that ammonium citrate could be used when removing Cu and Cr from a soil with 25% carbonates. The final concentrations of the elements were below the target values after the remediation. A question of whether the electrodialytic remediation method can be used for other waste products arose. Preliminary experiments showed that the method could be used for removal of different heavy metals from impregnated wood waste, fly ash from straw combustion, and fly ash from municipal solid waste incineration. The best result was obtained with the wood waste where more than 80% of each of the polluting elements Cu, Cr and As was removed in a 7-day experiment in which oxalic acid was used as enhancement solution. From the straw ash, 66% of the Cd was removed, but 64% of the fly ash dry mass dissolved during the treatment. In this actual experiment, no enhancement solution was used but that will be necessary to avoid dissolution of the ash to such a high extent. For the fly ash from waste incineration, ammonium citrate was tested as enhancement solution and in 14 days 62% Cd, 53% Cu, 6% Pb, and 31% Zn were removed. The preliminary results were thus promising for developing the electrodialytic method to other products than soil, although more research is needed especially in finding the best enhancement solutions for each product.