TY  - SER
AU  - Fernando Carrera
AU  - Javier Taboada,Cristina Montojo
AU  - Jorge Feijoo,Xosé Ramón Nóvoa
AU  - Teresa Rivas,María Jesús Mosquera
TI  - Granite desalination using electromigration. Influence of type of granite and saline contaminant
SN  - 1296-2074
KW  - Chloride
KW  - Clorur
KW  - Cloruro
KW  - Desalination
KW  - Desalinización
KW  - Dessalinització
KW  - Elecromigración
KW  - Electromigració
KW  - Electromigration
KW  - Granit
KW  - Granite
KW  - Granito
KW  - Sulfat
KW  - Sulfate
KW  - Sulfato
N2  - We describe the results of electromigration desalination of two soluble salt-contaminated Galician granites. The efficacy of elecromigration, which had not been previously applied to granite, was assessed for two types of contaminated with a 20% NaCl solution and sewater. Desalination effectivenes was evaluated as follows: (1) analysis of anode and cathode ion content during testing; (2) analysis of ions at different distances from the elecrodes after testing; (3) pH assessment of the stone surfaces; and (4) evaluation of colour changes. Results were very satisfactory; by the end of testing, chloride was educed by almost 100% in both the NaCl and seawater contaminated samples. Sulfate reduction was also significant, despite this ion's lower mobility. The granite pH values remained close to neutral and colour changes were minimal. The difference in effectiveness of the process fot the two types of stone was associated with their dissimilar pore structure
ER  -