Tsiridis V, Petala M, Samaras P, Sakellaropoulos G P
Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Division of Hydraulics and Environmental Engineering, Department of Civil Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Waste Manag. 2015 Sep;43:255-63. doi: 10.1016/j.wasman.2015.05.031. Epub 2015 Jun 15.
The aim of this work was the assessment of the environmental impact of different origin fly ashes with regard to their final disposal. The experimental procedure included the performance of single column tests and column tests of fly ash and soil in series. The appraisal of the potential environmental hazards was implemented using physicochemical analyses and bioassays. Two different fly ash samples were examined, one fly ash produced from the combustion of sub-bituminous coal (CFA) and one fly ash produced from the combustion of lignite (LFA). Single column percolation tests were performed according to NEN 7343 protocol, while fly ash/soil experiments were conducted incorporating slight modifications to this protocol. The study focused on the release of metals Ba, Cr, Cu, Mo, Se and Zn and the ecotoxic behavior of leachates on crustacean Daphnia magna and bacteria Vibrio fischeri. The infiltration of the leachates of both fly ashes through soil affected considerably their leaching profile. The transport of Cu and Zn was facilitated by the dynamic leaching conditions and influenced by the pH of the leachates. Moreover, the release and bioavailability of Cr, Cu and Zn was probably altered during the infiltration experiments and organisms' response was not always correlated with the concentration of metals. Nevertheless, the results are signalling that possible manipulations and final disposal of fly ash should be considered when environmental threats are investigated.
这项工作的目的是评估不同来源的粉煤灰在最终处置方面对环境的影响。实验过程包括对粉煤灰和土壤进行单柱试验以及串联柱试验。利用物理化学分析和生物测定法对潜在的环境危害进行评估。研究了两种不同的粉煤灰样品，一种是次烟煤燃烧产生的粉煤灰（CFA），另一种是褐煤燃烧产生的粉煤灰（LFA）。单柱渗透试验按照NEN 7343标准进行，而粉煤灰/土壤试验在该标准基础上进行了微小修改。该研究重点关注金属钡、铬、铜、钼、硒和锌的释放以及渗滤液对甲壳类动物大型溞和费氏弧菌的生态毒性行为。两种粉煤灰的渗滤液通过土壤的渗透对其淋溶曲线有很大影响。动态淋溶条件促进了铜和锌的迁移，并受渗滤液pH值的影响。此外，在渗透实验过程中，铬、铜和锌的释放及生物有效性可能发生了变化，而且生物体的反应并不总是与金属浓度相关。然而，研究结果表明，在调查环境威胁时应考虑粉煤灰的可能处理方式和最终处置。
