Abstract
The properties of solidified waste prepared in the field can be anticipated to be more variable than those of solidified samples prepared in the laboratory, because of the greater difficulty in controlling parameters such as untreated waste and binder homogeneity, accuracy of dosage, mixing efficiency, changes in handling characteristics caused by scale-up, etc. However, there is little information available regarding the effect of field variability on solidified waste properties. In a field trial conducted by the Wastewater Technology Centre it was found that the proportions of the waste (electric arc furnace dust) and binder (activated blast furnace slag) could be controlled within 2%, expressed as a fraction of the mix. Comparison of comprehensive physical and chemical test results for laboratory and field solidified specimens of electric arc furnace dust showed that the physical properties of the field solidified material were sensitive to changes in water addition. Chemical properties and leachability were most affected by changes in pH and acid neutralization capacity. However, both physical and chemical properties remained within the desired range.
Published Version
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