Regenerative Energie
This work is focused on the characterizationof a Chilean petroleum coke fly ash (PCFA) from circulated fluidized bed combustion (CFCB), and its potential use in Cu2+ and Pb2+ removal from acid wastewaters (pH 4). CFBC-PCFA presents a high Ca and SO3 content, being anhydrite the major crystalline mineral phase. Regarding to their environmental characterization, despite of its high Ni and V content, leaching tests allowed concluding that CFBC-PCFA is a non-hazardous residue. Heavy metals removal tests indicate that CFBC-PCFA is able to remove Cu2+ and Pb2+ mainly due to a precipitation process, at high liquid to solid ratios. According to these results, CFBC-PCFA may be used to remove heavy metals and neutralize acid wastewaters, suggesting a possible replacement of pure and costly alkaline materials.
Research regarding petroleum coke fly ashes (PCFA) is increasing due to the use of petroleum coke (pet-coke) as low cost fuel (Wang et al. 2004). Petroleum coke is being currently burned by means of circulated fluidized bed combustion (CFBC) technology, which uses calcium compounds (e.g. calcite) to remove high sulphur dioxide generated during the petroleum coke combustion. PCFA from CFBC have been already characterized (Anthony et al. 2007), detecting high contents of Ca, S, Mo, Sr, Ni and V. Research performance focused on the leaching of trace elements in fly ashes from coal/petroleum coke combustion was carried out, identifying as main leaching elements Ni, V, Mo and As. However, research about the CFBC-PCFA leachability has not been performed yet. CFBC-PCFA have been already investigated as sulphur-source in alfalfa crops, and ameliorant of different types of soils (Chen et al. 2008). Furthermore, the possibility of employing CFBC-PCFA for the neutralization and heavy metals removal in acid wastewaters or to replace clay liners in landfills has been already reviewed (González et al. 2009) Chile is a world leader in copper mining and production, facing environmental problems such as acid wastewaters with a high heavy metals content (Bezama & Sánchez 2006). Among the various remediation options, the most used and cost-effective is the addition of neutralizing agents such as magnesite, limestone and dolomite. Nevertheless, their use implies a high environmental and economic cost, due to the use of natural resources as raw materials (Watte et al. 2005). Therefore, this work attempts to characterize CFBC-PCFA and evaluate their use for heavy metals removal in acid wastewaters.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben |
| Quelle: | Depotech 2010 (November 2010) |
| Seiten: | 4 |
| Preis: | € 2,00 |
| Autor: | A. González Dr. Rodrigo Navia Natalia Moreno Xavier Querol |
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