In situ remediation of metal contaminated lake sediment using naturally occurring, calcium-rich clay mineral-based low-cost amendment
In situ remediation of metal contaminated lake sediment using naturally occurring, calcium-rich clay mineral-based low-cost amendment
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使用天然存在的、富含钙的粘土矿物的低成本改良剂对金属污染的湖泊沉积物进行原位修复
DOI：
10.1016/j.cej.2015.09.108
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发表时间：
2016-02-01
影响因子：
15.1
通讯作者：
Zhu, Jincan
中科院分区：
文献类型：
--
作者：
Yin, Hongbin;Zhu, Jincan
原位吸附剂改良剂因其在污染沉积物补救中的作用及其成本效益而受到关注。在这项研究中，两种天然存在的，低成本的富钙粘土矿物，天然富钙海泡石（NCSP）和天然富钙海泡石（NCAP）的有效性进行了研究，作为潜在的原位吸附剂修正修复铅和镉使用沉积物水的微观宇宙和15天的生物积累试验。将两种改良剂以0%、2.5%、5%和10%的比例与沉积物混合。结果表明，两种改良剂均能有效降低沉积物中大部分移动的金属，从而降低底栖生物对金属的吸收。此外，修复效率随着施用剂量的增加而增加。总的来说，沉积物处理率最高的10%NCAP和NCSP导致减少56.2%和34.2%，镉，81.5%和77.4%，铅，在酸溶部分。底栖生物对Pb和Cd的吸收分别减少了33.5 - 53.3%和20.9 - 37.1%。这些结果突出了使用这些天然存在的，富含钙的粘土矿物作为原位吸附剂的沉积物修复修正案的潜力。(C)2015 Elsevier B.V.版权所有。
In situ sorbent amendments have gained attention owing to their role in contaminated sediment remediation and their cost-effectiveness. In this study, the effectiveness of two naturally occurring, low-cost calcium-rich clay minerals, natural calcium-rich sepiolite (NCSP) and natural calcium-rich attapulgite (NCAP), were investigated as potential in situ sorbent amendments for remediation of Pb and Cd using a sediment water microcosm and 15-day bioaccumulation assays. The two amendments were mixed with sediment at rates of 0%, 2.5%, 5% and 10%. The results indicate that the two amendments can effectively reduce most of the mobile fraction of metal in sediment, which in turn reduces metal uptake by benthic organisms. Additionally, the remediation efficiency increased with application dosage. Overall, sediment treated with the highest rate of 10% NCAP and NCSP led to reductions of 56.2% and 34.2%, for Cd, and 81.5% and 77.4%, for Pb, in the acid-soluble fraction. Similarly, uptake of Pb and Cd by benthic organisms was reduced by 33.5-53.3% and 20.9-37.1%, respectively. These results highlight the potential for using these naturally occurring, calcium-rich clay minerals as in situ sorbent amendments for sediment remediation. (C) 2015 Elsevier B.V. All rights reserved.