School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
Environ Sci Pollut Res Int. 2019 Mar;26(8):7810-7820. doi: 10.1007/s11356-019-04147-9. Epub 2019 Jan 24.
In this paper, a novel strategy integrating ultrasound (US) with a Fenton-like (zero-valent iron/EDTA/air, ZEA) process was proposed for the removal of the refractory and carcinogenic aromatic amines (AAs) in textile dyeing sludge for the first time. The operating condition was optimized as 1.08 W/cm ultrasonic density, 15 g/L ZVI, and 1.0 mM EDTA, which could reach degradation efficiencies of 51.79% in US, 72.88% in ZEA, and 92.40% in US/ZEA system after 90-min reaction. Quenching experiments showed that electron transfer reactions generated by the iron ligands in ZEA brought about various reactive oxidative species (ROS), in which Fe (IV), O˙, and ˙OH dominated the degradation. US induced sludge disintegration by ultrasonic shear, proven by particle size decrease and supernatant organic matter upsurge, which helps ROS contact with those pollutants in the sludge cavities. Besides, US facilitated the iron redox cycle for oxygen activation by promoting the corrosion of ZVI and stripping considerable ferric ions from sludge iron oxides which were verified by SEM, XRF, and XPS. Graphical abstract.
本文首次提出了一种将超声（US）与芬顿样（零价铁/EDTA/空气，ZEA）工艺相结合的新策略，用于去除纺织染料污泥中难处理和致癌的芳香胺（AA）。优化了操作条件为 1.08 W/cm³超声密度、15 g/L ZVI 和 1.0 mM EDTA，在 90 分钟反应后，US、ZEA 和 US/ZEA 系统中的降解效率分别达到 51.79%、72.88%和 92.40%。猝灭实验表明，ZEA 中铁配体产生的电子转移反应产生了各种活性氧化物种（ROS），其中 Fe（IV）、O˙和˙OH 起主导作用。US 通过超声剪切诱导污泥解体，通过粒径减小和上清液有机物增加得到证明，这有助于 ROS 与污泥腔室中的那些污染物接触。此外，US 通过促进 ZVI 的腐蚀和从污泥氧化铁中剥离相当数量的铁离子，促进了铁的氧化还原循环，这通过 SEM、XRF 和 XPS 得到了验证。
