Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey.
Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey; Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
Chemosphere. 2020 Sep;255:127014. doi: 10.1016/j.chemosphere.2020.127014. Epub 2020 May 10.
This study presents the removal of thiocyanate (SCN) from coke oven wastewater by the electrooxidation (EO) process. Initially, the performances boron-doped diamond (BDD) and different DSA (Dimensionally stable anode) electrodes including Ti/IrO, Ti/IrO-RuO, and Ti/IrO-RuO-TiO in SCN removal were compared. BDD anode outperformed the Ti-based mixed metal oxide (MMO) anodes achieving 96.51% SCN removal efficiency. The most favorable conditions for the removal of SCN using BDD anode were determined as follows: pH = 9, current density = 43.10 A m, and the electrolyte concentration (NaSO) = 2.5 g L. The strong role of OH in the removal of SCN was confirmed by the addition of radical quenching agents. The evolution of the intermediates as a result of the EO of SCN was determined. Under the determined conditions, the EO process could remove 84.13% of SCN and 94.67% of phenol from a real coke oven wastewater, which was comparable to that of the simulated solution. The electrical energy consumption cost of the process to remove 1 kg of SCN was calculated as 0.208 US $. Overall, the study showed the EO using BDD anode is a cost-effective method for the removal of SCN from a coke oven wastewater.
本研究采用电氧化（EO）工艺去除焦炉废水中的硫氰酸盐（SCN）。首先，比较了硼掺杂金刚石（BDD）和不同的 DSA（尺寸稳定阳极）电极，包括 Ti/IrO、Ti/IrO-RuO 和 Ti/IrO-RuO-TiO 在 SCN 去除方面的性能。BDD 阳极的性能优于 Ti 基混合金属氧化物（MMO）阳极，达到 96.51%的 SCN 去除效率。使用 BDD 阳极去除 SCN 的最佳条件如下：pH = 9、电流密度 = 43.10 A m 和电解质浓度（NaSO）= 2.5 g L。通过添加自由基猝灭剂证实了 OH 在去除 SCN 中的重要作用。确定了 SCN 的 EO 过程中中间体的演变。在确定的条件下，EO 工艺可以去除实际焦炉废水中 84.13%的 SCN 和 94.67%的苯酚，与模拟溶液相当。去除 1 公斤 SCN 的工艺电能消耗成本计算为 0.208 美元。总的来说，该研究表明，使用 BDD 阳极的 EO 是一种从焦炉废水中去除 SCN 的经济有效的方法。
