CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China; USTC-CityU Joint Advanced Research Center, Suzhou Research Institute, University of Science and Technology of China, Suzhou 215123, China.
CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
J Hazard Mater. 2023 Jun 5;451:131104. doi: 10.1016/j.jhazmat.2023.131104. Epub 2023 Feb 28.
Phosphonates, as a kind of important organic phosphorus in wastewater, should be removed in terms of their environmental risks. Unfortunately, traditional biological treatments fail to remove phosphonates effectively due to their biological inertness. The reported advanced oxidation processes (AOPs) usually require pH adjustment or coupling with other technologies to achieve high removal efficiency. Thus, a simple and efficient method for phosphonate removal is urgently needed. Herein, ferrate was found to remove phosphonates effectively in one-step under near-neutral circumstances by coupling oxidation and in-situ coagulation. Nitrilotrimethyl-phosphonic acid (NTMP), a typical phosphonate, could be efficiently oxidized by ferrate to release phosphate. The fraction of phosphate release increased with increasing ferrate dosage and reached 43.1% when 0.15 mM ferrate was added. Fe(VI) was responsible for NTMP oxidation, while Fe(V), Fe(IV) and ⋅OH played a minor role. Ferrate-induced phosphate release facilitated total phosphorus (TP) removal, because the phosphate is more easily removed via ferrate-resultant Fe(III) coagulation than the phosphonates. The coagulation removal of TP could reach up to 90% within 10 min. Furthermore, ferrate exerted high removal efficiencies for other commonly used phosphonates with approximately or up to 90% TP removal. This work provides a one-step efficient method to treat phosphonate-containing wastewaters.
膦酸盐作为废水中一种重要的有机磷化合物，因其环境风险而需要去除。然而，由于其生物惰性，传统的生物处理方法无法有效地去除膦酸盐。已报道的高级氧化工艺（AOPs）通常需要进行 pH 调节或与其他技术耦合，以实现高去除效率。因此，迫切需要一种简单高效的去除膦酸盐的方法。本文发现，高铁酸盐在近中性条件下通过氧化和原位混凝一步反应可有效地去除膦酸盐。典型的膦酸盐——次氮基三甲基膦酸（NTMP）可被高铁酸盐有效氧化为磷酸盐。当加入 0.15 mM 的高铁酸盐时，磷酸盐的释放分数增加到 43.1%。Fe(VI)是 NTMP 氧化的主要因素，而 Fe(V)、Fe(IV)和 ⋅OH 则起次要作用。高铁酸盐诱导的磷酸盐释放促进了总磷（TP）的去除，因为与膦酸盐相比，磷酸盐更容易通过高铁酸盐生成的 Fe(III)混凝去除。在 10 min 内，TP 的混凝去除率可高达 90%。此外，高铁酸盐对其他常用的膦酸盐也具有较高的去除效率，TP 的去除率约为或高达 90%。这项工作提供了一种一步高效的方法来处理含膦酸盐的废水。
