从污水污泥中回收的腐殖质对修复前砷矿区土壤的适宜性 - 一种新方法。
Suitability of humic substances recovered from sewage sludge to remedy soils from a former As mining area - a novel approach.
机构信息
Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
出版信息
J Hazard Mater. 2017 Sep 15;338:160-166. doi: 10.1016/j.jhazmat.2017.05.019. Epub 2017 May 12.
Batch washing experiments were performed to evaluate the feasibility of using a solution of humic substances (HS) extracted from municipal sewage sludge as a washing agent to remove As from soils at a former As mining area. Soils (S1, S2, S3) differed in organic matter content, pH and As concentration. At pH 4 and a HS concentration of 4000mgTOCL, As removal efficiency ranged from 18% (S2) to 27% (S3). In all cases, As removal proceeded according to pseudo-second-order kinetics (equilibrium As concentrations ranged from 625mgkg (S3) to 1250mgkg (S3); rate constants, from 1.02×10kgmgmin (S1) to 2.05×10kgmgmin (S3). The time needed to reach equilibrium was 12h. With double washing, the efficiency of As removal was 1.5-times higher (on average) than with single washing. Double washing increased As stability, as indicated by the reduced partition index, especially in soils S1 and S3. Moreover, HS effectively decreased the content of the most toxic As(III) (by 95-97%).
批量洗涤实验评估了使用从城市污水污泥中提取的腐殖物质（HS）溶液作为洗涤剂从砷矿区的土壤中去除砷的可行性。土壤（S1、S2、S3）在有机质含量、pH 值和砷浓度方面存在差异。在 pH 值为 4 和 HS 浓度为 4000mgTOCL 的条件下，砷去除效率从 18%（S2）到 27%（S3）不等。在所有情况下，砷的去除均遵循拟二级动力学（平衡时砷浓度范围为 625mgkg（S3）至 1250mgkg（S3）；速率常数范围为 1.02×10kgmgmin（S1）至 2.05×10kgmgmin（S3）。达到平衡所需的时间为 12 小时。通过两次洗涤，砷去除效率（平均）比单次洗涤提高了 1.5 倍。HS 还通过降低分配指数有效地增加了砷的稳定性，特别是在 S1 和 S3 土壤中。此外，HS 有效地降低了最有毒的 As(III)的含量（降低了 95-97%）。
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