Evaluating two test methods used for characterizing leaching properties
Artikel i vetenskaplig tidskrift, 2008

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.

Författare

Maryam Mahmoudkhani

Industriella energisystem och -tekniker

Magda Wilewska-Bien

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Britt-Marie Steenari

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Hans Theliander

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Waste Management

0956-053X (ISSN)

Vol. 28 133-141

Ämneskategorier

Pappers-, massa- och fiberteknik

DOI

10.1016/j.wasman.2006.12.006