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Enhanced removal of trivalent chromium from leather wastewater using engineered bacteria immobilized on magnetic pellets
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-02-06 , DOI: 10.1016/j.scitotenv.2021.145647
Jicun Wang , Shuai Zhao , Zhenming Ling , Tuoyu Zhou , Pu Liu , Xiangkai Li

Leather wastewater contains various toxic contaminants, with trivalent chromium (Cr(III)) having high concentration and adversely affecting wastewater treatment. In this study, a Cr(III) adsorption protein (MerP) was displayed on the cell surface of Escherichia coli and then coupled with a magnetic pellet system to facilitate Cr(III) adsorption. The results showed the engineered strain M-BL21 achieved an in vitro Cr(III) adsorption capacity of 2.38 mmol/g. Next, the magnetic pellets were prepared as component ratios of sodium alginate (2.5%), polyvinyl alcohol (8%), Fe3O4 nanoparticles (3.5%), and M-BL21 at 3 g/L. The optimized system was capable of Cr(III) adsorption at an efficiency of 91.29%, which was substantially higher than that of the magnetic carrier alone (67%). Results of scanning electron microscopy with energy-dispersive X-ray analysis proved that Cr(III) was absorbed on the magnetic pellet. The recyclable performance of magnetic property (13.34185 emu/g) and high Cr(III) adsorption efficiency (68.75%) remained after five cycles of Cr(III) absorption. In the medium-scale experiment, 25 L of leather wastewater were treated with magnetic pellet and the Cr(III) removal efficiency reached 88.2%. Thus, our results present an advanced, fully operational, and eco-friendly method for in situ removal of Cr(III) from contaminated wastewater.



中文翻译:

使用固定在磁性颗粒上的工程菌增强皮革废水中三价铬的去除

皮革废水含有各种有毒污染物,其中三价铬(Cr(III))的浓度很高,对废水处理产生不利影响。在这项研究中,Cr(III)吸附蛋白(MerP)显示在大肠杆菌的细胞表面,然后与磁性沉淀系统偶联以促进Cr(III)吸附。结果表明,工程菌株M-BL21的体外Cr(III)吸附能力为2.38 mmol / g。接着,以藻酸钠(2.5%),聚乙烯醇(8%),Fe 3 O 4的成分比例制备磁性颗粒。纳米颗粒(3.5%)和M-BL21的浓度为3 g / L。优化的系统能够以91.29%的效率吸附Cr(III),该效率大大高于单独的磁性载体(67%)。扫描电子显微镜的能量色散X射线分析结果表明,Cr(III)吸附在磁性颗粒上。经过五个循环的Cr(III)吸收后,仍保持了可回收的磁性(13.34185 emu / g)和高的Cr(III)吸附效率(68.75%)。在中等规模的实验中,用磁性颗粒处理了25升皮革废水,Cr(III)的去除率达到88.2%。因此,我们的结果提出了一种先进的,完全可操作的,环境友好的方法,用于从污染废水中原位去除六价铬。

更新日期:2021-02-23
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