Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A5B9, Canada.
Faculty of Chemical and Food Engineering, Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, Ethiopia.
Environ Sci Pollut Res Int. 2024 Feb;31(6):8736-8750. doi: 10.1007/s11356-023-31547-9. Epub 2024 Jan 5.
A single-step dye removal strategy from wastewater is inadequate for concentrations above 100 mg/L. In order to address this limitation, the adsorption of high dye concentrations followed by phytoremediation is a potential approach for the treatment of dye-contaminated wastewater. This combined method utilizes physical adsorption and biological processes to remove dyes from wastewater. Herein, we investigated a pilot-scale multi-step cascaded process where batch adsorption and fixed-bed column adsorption were combined with phytoremediation to remove cellulose-reactive blue dye at 200 to 500 mg/L concentrations. The batch adsorption utilized low-cost water hyacinth root powder (WHRP) bioadsorbent having 670 m/g surface area, whereas the fixed-bed column adsorption used sand having a surface area of 75 m/g. The phytoremediation process utilized water hyacinth plants in a series of ponds. The effluent from one unit is fed to the next until the dye is removed to more than 98% for all concentrations considered in this study. Pilot-scale experimental data fitting to adsorption isotherms and kinetics were performed to gain insight into the pilot-scale adsorption mechanism. The fixed-bed sand column adsorption was conducted at different inlet dye concentrations, flow rates, and bed heights. The breakthrough curves were fit to the Thomas, Yoon-Nelson, and Bohart-Adams models. The effluent from the fixed-bed column was transferred to phytoremediation ponds, where complete dye removal was achieved. Overall, data collectively presented in this study demonstrated that the combined adsorption and phytoremediation approach offers a potential solution for the remediation of high dye concentration in wastewater, providing an effective and sustainable treatment option.
单一的废水脱色策略对于浓度高于 100mg/L 的情况是不够的。为了解决这个限制，高浓度染料的吸附后再进行植物修复是处理染料污染废水的一种潜在方法。这种组合方法利用物理吸附和生物过程从废水中去除染料。在此，我们研究了一个中试规模的多步级联工艺，其中分批吸附和固定床柱吸附与植物修复相结合，用于去除 200 至 500mg/L 浓度的纤维素反应性蓝染料。分批吸附使用具有 670m2/g 表面积的低成本水葫芦根粉（WHRP）生物吸附剂，而固定床柱吸附使用表面积为 75m2/g 的沙子。植物修复过程利用水葫芦植物在一系列池塘中进行。一个单元的流出物被输送到下一个单元，直到所有考虑到的浓度的染料去除率超过 98%。进行了中试规模实验数据拟合吸附等温线和动力学，以深入了解中试规模吸附机制。在不同的入口染料浓度、流速和床层高度下进行了固定床沙柱吸附。突破曲线拟合到托马斯、Yoon-Nelson 和 Bohart-Adams 模型。固定床柱的流出物被转移到植物修复池塘中，在那里完成了染料的去除。总的来说，本研究中综合呈现的数据表明，吸附和植物修复相结合的方法为处理废水中高浓度染料提供了一种潜在的解决方案，提供了一种有效和可持续的处理选择。
