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Influence of Organo-Metal Interactions on Regeneration of Exhausted Clay Mineral Sorbents in Soil Columns Loaded with Heavy Metals

查看全文 作　　者：Yasser [1,2]REFAEY;Boris [1]JANSEN;Pim DE [1]VOOGT;John [1]R.PARSONS;Abdel-Hamid EL-[2]SHATER;Abdel-Aziz EL-[2]HADDAD;Karsten [1,3]KALBITZ 高影响力作者 机构地区：[1]Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam;[2]Geology Department, Faculty of Science, Sohag University;[3]Soil Resources and Land Use, Institute of Soil Science and Site Ecology, Faculty of Environmental Sciences, Technical University Dresden高影响力机构 出　　处：《Pedosphere》索引2017年第27卷第3期,共9页高影响力期刊 基　　金：supported by a scholarship from the Faculty of Science, University of Amsterdam, The Netherlands 摘　　要：Natural clay minerals can play an important role in crude remediation of wastewater polluted with the heavy metals(HMs) Cu, Zn and Ni. The presence and timing of addition of natural dissolved organic matter(DOM) have a significant effect on the HM removal by clay mineral sorbents. However, the influence of the presence of DOM on the remediation of the used clay mineral sorbents once saturated with HMs is largely unknown. To resolve this, clay mineral-rich soil column of varying composition, loaded(i) with Cu, Zn and Ni only,(ii) first with DOM followed by Cu, Zn and Ni, or(iii) with DOM, Cu, Zn and Ni simultaneously, was used in a set of desorption experiments. The soil columns were leached with 0.001 mol L^(-1)CaCl_2 dissolved in water as control eluent and 0.001 mol L^(-1)CaCl_2 dissolved in DOM as treatment eluent. During the preceding loading phase of the sorbent, the timing of DOM addition(sequential or concurrent with HMs) was found to have a significant influence on the subsequent removal of the HMs. In particular when the column was loaded with DOM and HMs simultaneously, largely irreversible co-precipitation took place. Our results indicate that the regeneration potential of clay mineral sorbents in wastewater treatment will be significantly reduced when the treated water is rich in DOM. In contrast, in manured agricultural fields(where HMs enter together with DOM), HM mobility will be lower than expected from interaction dynamics of HMs and clay minerals. 关 键 词：粘土矿物 吸附剂再生 重金属污染 相互作用 有机金属 土壤 矿物吸附剂 溶解有机物
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