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Evaluating two test methods used for characterizing leaching properties

Maryam Mahmoudkhani (Institutionen för energi och miljö, Värmeteknik och maskinlära) ; Magda Wilewska-Bien (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Britt-Marie Steenari (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Hans Theliander (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik)
Waste Management (0956-053X). Vol. 28 (2008), 1, p. 133-141.
[Artikel, refereegranskad vetenskaplig]

A standard leaching test method (EN 12457-3) was compared with a modified pHstat-column leaching test method with respect to leaching information obtained for aggregates composed of different alkaline solid wastes. In addition to a different experimental set-up, the major dissimilarity between the two test methods was the chemical equilibrium condition, i.e., in the first test the system approaches equilibrium while in the second test the system is far from equilibrium conditions. The leaching trends of sodium, calcium, chloride, sulfate and cadmium were studied. Results showed that these two test methods were comparable in respect to the total amount sodium and sulfate leached. It was also concluded that the two test methods provide different information for the constituents for which dissolution reaction is highly dependent on pH and other experimental conditions, e.g., flow rate. It was found that a batch test can be used in order to investigate the total amount leached, while a modified column-pHstat test generates more detailed results on leaching trends of some constituents.



Denna post skapades 2009-01-26. Senast ändrad 2016-04-14.
CPL Pubid: 88962

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Värmeteknik och maskinlära (2005-2014)
Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik (2005-2014)

Ämnesområden

Pappers-, massa- och fiberteknik

Chalmers infrastruktur