Research Institute on Mines and Environment (RIME), University of Quebec in Abitibi-Temiscamingue (UQAT), 445 Boul. de l'Universite, Rouyn-Noranda, QC, J9X 5E4, Canada.
Centre Technologique des Résidus Industriels (CTRI), Rouyn-Noranda, QC, J9X 5E5, Canada.
Environ Sci Pollut Res Int. 2019 Mar;26(9):9322-9332. doi: 10.1007/s11356-019-04381-1. Epub 2019 Feb 5.
Performance of raw and two Fe-loaded biochars, produced either by evaporation (E-product, 26.9% Fe) or precipitation (P-product, 12.6% Fe), was evaluated in batch and column testing for As(V) and Sb(III) removal from contaminated neutral drainage (CND). Batch testing results showed that sorption capacity of the E-product tripled for As(V) and quintupled for Sb(III), whereas for the P-product, it doubled for both contaminants, relative to the raw biochar. Moreover, As(V) removal by the E-product reached 90% in less than 8 h, for initial concentrations up to 50 mg/L. In column testing, the E-product efficiently treated the influent [pH 6; 1 mg/L As(V)] for more than 286 days. The pH of the final effluent was within the legally allowed limits (6-9.5) while less than 0.3 mg/L Fe leached out. Based on these findings, Fe-loaded biochar by evaporation (E-product) seems promising for As(V) treatment in CND.
采用批式和柱式实验，评价了由蒸发（E-产物，含 26.9%Fe）和沉淀（P-产物，含 12.6%Fe）法制备的原始生物炭和两种负载铁的生物炭（Fe-负载生物炭）对中性污染排水（CND）中 As(V)和 Sb(III)的去除效果。批式实验结果表明，与原始生物炭相比，E-产物对 As(V)的吸附容量增加了两倍，对 Sb(III)的吸附容量增加了五倍，而 P-产物对两种污染物的吸附容量均增加了一倍。此外，E-产物对初始浓度高达 50mg/L 的 As(V)的去除率在不到 8h 内达到 90%。在柱式实验中，E-产物对进水[pH 6；1mg/L As(V)]的处理效果良好，持续时间超过 286 天。最终出水的 pH 值在法定允许范围内（6-9.5），而溶出的 Fe 含量低于 0.3mg/L。基于这些发现，蒸发法制备的负载铁生物炭（E-产物）似乎有望用于 CND 中 As(V)的处理。
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