Institut National de la Recherche Scientifique (Centre Eau Terre Environnement), Université du Québec, 490 Rue de la Couronne, Québec, Qc, G1K 9A9, Canada.
Université du Québec en Abitibi-Témiscamingue (Institut de Recherche en Mines et Environnement), Université du Québec, 445 Boulevard de l'Université, Rouyn-Noranda, Qc, J9X 5E4, Canada.
J Environ Manage. 2020 Jun 1;263:110371. doi: 10.1016/j.jenvman.2020.110371. Epub 2020 Mar 12.
Industrial activities lead to the contamination of large amounts of soils polluted by both inorganic and organic compounds, which are difficult to treat due to different chemical properties. The efficiency of a decontamination process developed to simultaneously remove mixed contamination of industrial soils was evaluated at the pilot-scale, as well as operating costs associated to that process to define the best remediation approach. The results showed that the treatment of the coarse fractions (>0.250 mm) of 40 kg of soil by attrition in countercurrent mode allowed the removal of 17-42% of As, 3-31% of Cr, 20-38% of Cu, and 64-75% of polychlorinated dioxins and furans (PCDD/F). Removals of 60% for As, 2.2% for Cr, 23% for Cu, and 74% for PCDD/F were obtained during the treatment of attrition sludge (<0.250 mm) by alkaline leaching process. However, the results of the techno-economic evaluation, carried out on a fixed plant with an annual treatment capacity of 7560 tons of soil treated (tst), showed that the estimated overall costs for the attrition process alone [scenario 1] (CAD$ 451/tst) were lower than the costs of the process, which additionally includes an alkaline leaching step to treat attrition sludge [scenario 2] (CAD$ 579/tst). This techno-economic evaluation also showed that the process becomes competitive with current disposal options (thermal desorption and landfilling - CAD$ 600/tst) from a certain treatment capacity, which is around of 3465 tst/yr for the scenario 1 and 6930 tst/yr for the scenario 2. On the other hand, the techno-economic evaluations are crucial to selecting feasible decontamination process for a soil remediation project, with considerations of the type of contamination, site characteristics and cost effectiveness.
工业活动导致大量土壤受到无机和有机化合物的污染，由于化学性质不同，这些土壤很难处理。为了同时去除工业土壤的混合污染，在中试规模下评估了一种开发的去污工艺的效率，并评估了与该工艺相关的运营成本，以确定最佳修复方法。结果表明，通过逆流磨损对 40 公斤土壤的粗粒部分（>0.250 毫米）进行处理，可以去除 17-42%的砷、3-31%的铬、20-38%的铜和 64-75%的多氯二恶英和呋喃（PCDD/F）。在通过碱性浸出过程处理磨损污泥（<0.250 毫米）时，获得了 60%的砷去除率、2.2%的铬去除率、23%的铜去除率和 74%的 PCDD/F 去除率。然而，技术经济评估的结果表明，在一个具有 7560 吨/年处理能力的固定工厂（tst）上进行的技术经济评估表明，仅磨损工艺的估计总成本（CAD$451/tst）低于包括碱性浸出步骤的工艺成本[方案 2]（CAD$579/tst）。该技术经济评估还表明，从一定的处理能力来看，该工艺变得具有竞争力，与当前的处置选择（热解吸和填埋- CAD$600/tst）相比，该工艺的处理能力约为 3465 tst/yr（方案 1）和 6930 tst/yr（方案 2）。另一方面，技术经济评估对于选择土壤修复项目可行的去污工艺至关重要，需要考虑污染类型、场地特征和成本效益。
