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Electrodialytic removal of cadmium from straw combustion fly ash
Author(s) -
Hansen Henrik K,
Ottosen Lisbeth M,
Villumsen Arne
Publication year - 2004
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1063
Subject(s) - cadmium , fly ash , straw , environmental remediation , environmental science , nutrient , combustion , chemistry , waste management , pulp and paper industry , environmental chemistry , contamination , inorganic chemistry , engineering , ecology , organic chemistry , biology
Abstract Fly ash from straw combustion contains valuable nutrients when returned to agricultural soils. In many instances, however, this fly ash may contain heavy metals, such as cadmium, at levels which often exceed the limits given by the Danish legislation. Thus before utilizing the nutrients, cadmium must be removed from these ashes. The use of an electrodialytic remediation method to remove cadmium from fly ash arising from straw combustion and containing 11.2 mg Cd kg −1 DM (dry matter) was accessed. After 36 days of remediation at a constant current density of 5.6 mA cm −2 more than 97% of the cadmium had been removed from around 150 g ash on a dry basis. Copyright © 2004 Society of Chemical Industry