Abstract

In the present work, the charcoal obtained after the gasification of wood residues was tested in a pilot adsorption unit to evaluate the feasibility of treating real textile wastewater on a semi-industrial scale. The aims were to evaluate the global performance of the adsorption column in the pilot system using a methylene blue (MB) solution, and then a real sample of textile wastewater. Two charcoal samples, which were a by-product of the gasification process, were obtained, characterized, and tested with a MB dye solution. The experimental adsorption capacity of the fixed-bed was near 34 mg.g⁻¹ in both cases, and the overall removal efficiency of the column was >91%. Experimental data were fitted according to the Thomas and Adams-Bohart models. The pilot plant proved to be effective for improving the treatment of real textile wastewater, regarding the removal of color and part of organic matter, verified by the evolution of chemical oxygen demand over time. The cost to operate the pilot plant was calculated, and the contribution to the circular economy was considered. The pilot unit was promising for improving the wastewater treatment process, adding value, and giving a new purpose to a waste that normally would be disposed in the environment.

摘要

在目前的工作中，木材残渣气化后获得的木炭在中试吸附装置中进行了测试，以评估在半工业规模上处理实际纺织废水的可行性。目的是评估使用亚甲蓝 (MB) 溶液的中试系统中吸附柱的整体性能，然后是纺织废水的真实样品。获得了两个木炭样品，它们是气化过程的副产品，用 MB 染料溶液进行了表征和测试。固定床的实验吸附容量接近34 mg.g ^-1在这两种情况下，色谱柱的整体去除效率均 > 91%。实验数据根据 Thomas 和 Adams-Bohart 模型进行拟合。试验工厂证明对于改善实际纺织废水的处理是有效的，关于去除颜色和部分有机物，并通过化学需氧量随时间的演变得到验证。计算了试点工厂的运营成本，并考虑了对循环经济的贡献。该试点装置有望改善废水处理过程，增加价值，并为通常会在环​​境中处理的废物赋予新的用途。