Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Nam-gu, Pohang, 37673, Republic of Korea.
Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Nam-gu, Pohang, 37673, Republic of Korea; National Institute of Environmental Research, Seo-gu, Incheon, 22689, Republic of Korea.
Chemosphere. 2020 Oct;257:127117. doi: 10.1016/j.chemosphere.2020.127117. Epub 2020 May 25.
We report the potential of a sulfidized nanoscale zerovalent iron-persulfate (S-nZVI-PS) system for in situ chemical oxidation (ISCO) of groundwater pollutants. The study was conducted using a sand-filled rectangular box with a permeable reactive barrier of S-nZVI as a facsimile of the ISCO system. Synthetic water contaminated with a target pollutant (reactive black-5, RB-5) was continuously passed through the box. The injection of PS led to the complete removal of RB-5 and the system remained reactive for approximately 12 days. This system has a benefit that the oxidation products of S-nZVI (i.e., FeO, FeO and FeSO) can further activate PS to retain its reactivity. In a separate trial, this method exploited oxidation, reduction, adsorption and co-precipitation mechanisms that conspired to remove two different groundwater pollutants- arsenite and 1,4-dioxane. These results confirmed the utility of S-nZVI-PS as a mediator of ISCO processes to degrade groundwater pollutants.
我们报告了一种硫化纳米零价铁-过硫酸盐（S-nZVI-PS）系统在地下水污染物原位化学氧化（ISCO）中的潜力。该研究使用一个填充有沙子的矩形盒子，其中填充有作为 ISCO 系统模拟物的 S-nZVI 渗透反应屏障。用含有目标污染物（活性黑 5，RB-5）的合成水连续通过盒子。注入 PS 导致 RB-5 被完全去除，并且该系统在大约 12 天内保持反应性。该系统的一个好处是，S-nZVI 的氧化产物（即 FeO、FeO 和 FeSO）可以进一步激活 PS 以保持其反应性。在另一个试验中，该方法利用氧化、还原、吸附和共沉淀机制共同去除两种不同的地下水污染物 - 亚砷酸盐和 1,4-二恶烷。这些结果证实了 S-nZVI-PS 作为 ISCO 过程的介质用于降解地下水污染物的实用性。
