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首页> 外文期刊>International Journal of Environmental Science and Technology >Vermiculite bio-barriers for Cu and Zn remediation: an eco-friendly approach for freshwater and sediments protection
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Vermiculite bio-barriers for Cu and Zn remediation: an eco-friendly approach for freshwater and sediments protection

机译：用于铜和锌修复的石生物屏障：一种生态友好的淡水和沉积物保护方法

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摘要

The increase in heavy metal contamination in freshwater systems causes serious environmental problems in most industrialized countries, and the effort to find eco-friendly techniques for reducing water and sediment contamination is fundamental for environmental protection. Permeable barriers made of natural clays can be used as low-cost and eco-friendly materials for adsorbing heavy metals from water solution and thus reducing the sediment contamination. This study discusses the application of permeable barriers made of vermiculite clay for heavy metals remediation at the interface between water and sediments and investigates the possibility to increase their efficiency by loading the vermiculite surface with a microbial biofilm of Pseudomonas putida, which is well known to be a heavy metal accumulator. Some batch assays were performed to verify the uptake capacity of two systems and their adsorption kinetics, and the results indicated that the vermiculite bio-barrier system had a higher removal capacity than the vermiculite barrier (+34.4 and 22.8 % for Cu and Zn, respectively). Moreover, the presence of P. putida biofilm strongly contributed to fasten the kinetics of metals adsorption onto vermiculite sheets. In open-system conditions, the presence of a vermiculite barrier at the interface between water and sediment could reduce the sediment contamination up to 20 and 23 % for Cu and Zn, respectively, highlighting the efficiency of these eco-friendly materials for environmental applications. Nevertheless, the contribution of microbial biofilm in open-system setup should be optimized, and some important considerations about biofilm attachment in a continuous-flow system have been discussed.
机译：淡水系统中重金属污染的增加在大多数工业化国家中造成了严重的环境问题，寻找能够减少水和沉积物污染的环保技术的努力对于环境保护至关重要。由天然粘土制成的可渗透屏障可用作低成本和环保材料，可从水溶液中吸附重金属，从而减少沉积物污染。这项研究讨论了由ver石粘土制成的渗透性屏障在水和沉积物之间的界面修复重金属方面的应用，并研究了通过在put石表面加载恶臭假单胞菌的微生​​物生物膜来提高其效率的可能性。重金属蓄能器。进行了一些分批分析以验证两个系统的吸收能力及其吸附动力学，结果表明the石生物屏障系统的去除能力高于than石屏障（铜和锌分别为+34.4和22.8％） ）。此外，恶臭假单胞菌生物膜的存在极大地促进了金属吸附在ver石板上的动力学。在开放系统条件下，在水和沉积物之间的界面处存在a石屏障可以分别将铜和锌的沉积物污染降低多达20％和23％，从而突出了这些环保材料在环境应用中的效率。然而，微生物生物膜在开放系统设置中的贡献应该得到优化，并且已经讨论了有关连续流系统中生物膜附着的一些重要考虑因素。

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