Gomes Helena I, Jones Ashley, Rogerson Mike, Greenway Gillian M, Lisbona Diego Fernandez, Burke Ian T, Mayes William M
School of Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
School of Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
J Environ Manage. 2017 Feb 1;187:384-392. doi: 10.1016/j.jenvman.2016.10.063. Epub 2016 Nov 8.
Leachable vanadium (V) from steel production residues poses a potential environmental hazard due to its mobility and toxicity under the highly alkaline pH conditions that characterise these leachates. This work aims to test the efficiency of anion exchange resins for vanadium removal and recovery from steel slag leachates at a representative average pH of 11.5. Kinetic studies were performed to understand the vanadium sorption process. The sorption kinetics were consistent with a pseudo-first order kinetic model. The isotherm data cannot differentiate between the Langmuir and Freundlich models. The maximum adsorption capacity (Langmuir value q) was 27 mg V g resin. In column anion exchange, breakthrough was only 14% of the influent concentration after passing 90 L of steel slag leachate with 2 mg L V through the column. When eluting the column 57-72% of vanadium was recovered from the resin with 2 M NaOH. Trials on the reuse of the anion exchange resin showed it could be reused 20 times without loss of efficacy, and on average 69% of V was recovered during regeneration. The results document for the first time the use of anion exchange resins to remove vanadium from steel slag leachate. As an environmental contaminant, removal of V from leachates may be an obligation for long-term management requirements of steel slag repositories. Vanadium removal coupled with the recovery can potentially be used to offset long-term legacy treatment costs.
钢铁生产残渣中可浸出的钒（V），因其在这些浸出液所特有的高碱性pH条件下具有流动性和毒性，从而构成潜在的环境危害。这项工作旨在测试阴离子交换树脂在代表性平均pH值为11.5的条件下，从钢渣浸出液中去除和回收钒的效率。进行了动力学研究以了解钒的吸附过程。吸附动力学符合准一级动力学模型。等温线数据无法区分朗缪尔模型和弗伦德里希模型。最大吸附容量（朗缪尔值q）为27 mg V g树脂。在柱式阴离子交换中，将90 L含2 mg L V的钢渣浸出液通过柱子后，穿透点仅为进水浓度的14%。用2 M NaOH洗脱柱子时，57 - 72%的钒从树脂中回收。阴离子交换树脂的重复使用试验表明，它可以重复使用20次而不损失效能，并且在再生过程中平均回收69%的钒。研究结果首次记录了使用阴离子交换树脂从钢渣浸出液中去除钒的情况。作为一种环境污染物，从浸出液中去除钒可能是钢渣储存库长期管理要求的一项义务。去除钒并加以回收有可能用于抵消长期遗留的处理成本。
