School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
Chemosphere. 2020 Jul;251:126326. doi: 10.1016/j.chemosphere.2020.126326. Epub 2020 Feb 28.
Eutrophication of surface water bodies is a global problem in recent years. Dosing polluted water with oxygen releasing compounds (ORCs), especially those that can remove excessive nutrients simultaneously is regarded as one of the most economical and eco-friendly methods of treating eutrophic waters. In this study, a novel Mg-based ORC was synthesized and characterized as a magnesium hydroxide and hydrogen peroxide complex (MHHPC) with Mg to HO ratio of 2:1. Oxygen-releasing, pH-adjusting and nutrient-removal potentials of MHHPC were evaluated in nano-pure and eutrophic water. The overall performance of MHHPC in preventing the eutrophic water from turning black and odorous was compared with the performance of other ORCs namely, MgO, CaO and the combination of MgCl and HO. The results showed that MHHPC was capable of constantly releasing oxygen to aqueous phase over a period of one week. Phosphate and ammonia nitrogen in synthetic buffered water can were removed as struvite and other precipitates from the aqueous phase. In the synthetic eutrophic water, all the ORCs tested were able to reduce aqueous ammonia nitrogen below 0.5 mM, while only CaO and MHHPC successfully removed the aqueous phosphate. However, CaO and MgCl+HO significantly inhibited microbial activity.
近年来，地表水富营养化是一个全球性问题。向受污染的水中投加释放氧气的化合物（ORC），特别是那些可以同时去除过量营养物质的化合物，被认为是处理富营养化水的最经济和最环保的方法之一。在这项研究中，合成了一种新型的基于镁的 ORC，并将其表征为一种具有 2:1 的 Mg 与 HO 比的氢氧化镁和过氧化氢复合物（MHHPC）。在纳米纯水中和富水中评价了 MHHPC 的释放氧气、调节 pH 值和去除营养物质的潜力。将 MHHPC 防止富水变黑和发臭的整体性能与其他 ORC（即 MgO、CaO 和 MgCl 和 HO 的组合）的性能进行了比较。结果表明，MHHPC 能够在一周的时间内持续向水相中释放氧气。在合成缓冲水中，磷酸盐和氨氮可以作为鸟粪石和其他沉淀物从水相中去除。在合成富水中，所有测试的 ORC 都能够将水中的氨氮降低到 0.5 mM 以下，而只有 CaO 和 MHHPC 成功去除了水中的磷酸盐。然而，CaO 和 MgCl+HO 显著抑制了微生物的活性。
