A novel magnesium-based oxygen releasing compound for eutrophic water remediation. (July 2020)

• Record Type: Journal Article
• Authors: Li, Zhipeng; Sun, Peizhe; Zhang, Ruochun; Yang, Yanwen
• Is Part Of: Chemosphere. Volume 251(2020)
• Publication Date: 2020-07
• Subjects: Oxygen releasing compound (ORC) -- Phosphate removal -- Magnesium -- Struvite -- Eutrophication; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126326
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: 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 H2 O2 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, MgO2, CaO2 and the combination of MgCl2 and H2 O2 . 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 CaO2 and MHHPC successfully removed the aqueous phosphate. However, CaO2 and MgCl2 +H2 O2 significantly inhibited microbial activity. Highlights: A new Mg-based oxygen releasing compound (MHHPC) was synthesized. Oxygen-releasing, pH-adjusting and nutrient-removal potential of MHHPC was evaluated. MHHPC was capable of constantly releasing oxygen to aqueous phase over one week. Phosphate and ammonia can be removed as struvite by MHHPC.