文章基本信息

标题：Kinetics of Cu, Pb and Zn removal during soil flushing with washing agents derived from sewage sludge
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作者：Barbara Klik ; Zygmunt M. Gusiatin ; Dorota Kulikowska 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2021
卷号：11
DOI：10.1038/s41598-021-89458-z
语种：English
出版社：Springer Nature
摘要：This paper presents the first tests of Cu (7875 mg/kg), Pb (1414 mg/kg) and Zn (566 mg/kg) removal from contaminated soil with sewage-sludge–derived washing agents (SS_WAs) (dissolved organic matter, DOM; soluble humic-like substances, HLS; soluble humic substances, SHS) and Na 2EDTA (as a standard benchmark) in column experiments. Flow rates of 0.5 ml/min and 1 ml/min were used. Using a 1. order kinetic model, the kinetic constant ( k), the maximum concentrations of each metal removed ( C max), and the initial rates of metal removal ( r) were established. At both flow rates, stable flow velocity was maintained for approximately eight pore volumes, for flushing times of 8 h (1.0 ml/min) and 16 h (0.5 ml/min). Although the flow rate did not influence k, it influenced C max: at 1 ml/min, C max values were higher than at 0.5 ml/min. For Cu and Zn, but not Pb, k was about twofold higher with Na 2EDTA than with SS_WAs. Although Na 2EDTA gave the highest k Cu, C max,Cu was highest with DOM (Na 2EDTA, 66%; DOM 73%). For Pb removal, HLS was the most effective SS_WA (77%; Na 2EDTA was 80% effective). k Zn was about twofold higher with Na 2EDTA than with SS_WAs. C max,Zn was highest with HLS. The quick mobilization of Cu, Pb and Zn with most of the WAs corresponded to efficient metal removal from the exchangeable (F1) fraction.