Abstract
Experimental work with wood ash (WA) from incineration of virgin wood shows that about 45% of the initial 79 mg/kg Cr leaches out in water, and even after a three step washing process in water, the WA leaches Cr. The leaching is highest at highly alkaline conditions. Electro-dialysis showed that the leached Cr was in anionic form, but at the present high pH, both Cr(III) and Cr(VI) can form anionic complexes, so the oxidation state cannot be determined from this investigation. Because the extraction of Cr is so dependent on pH under alkaline conditions, the use of acid in the first step of sequential extraction gave an error in assessing the Cr present in this step. More Cr is extracted from WA in water than in weak acid.
Original language | English |
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Title of host publication | Wastes: Solutions, Treatments and Opportunities III - Selected papers from the 5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019 |
Editors | Cândida Vilarinho, Fernando Castro, Margarida Gonçalves, Ana Luísa Fernando |
Publisher | CRC Press/Balkema |
Pages | 408-413 |
Number of pages | 6 |
ISBN (Print) | 9780367257774 |
DOIs | |
Publication status | Published - 2020 |
Event | 5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019 - Costa da Caparica, Portugal Duration: 4 Sept 2019 → 6 Sept 2019 |
Conference
Conference | 5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019 |
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Country/Territory | Portugal |
City | Costa da Caparica |
Period | 4/09/19 → 6/09/19 |