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- Title
A Novel Treatment of Acid Mine Drainage by Schwertmannite Synthesis Using H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>O<sub>2</sub> as Composite Oxidants.
- Authors
Chen, Siqing; Liu, Hu; Guo, Huanfang; He, Xin; Yan, Hong; Jin, Hua
- Abstract
Acid mine drainage (AMD) poses severe social and ecological issues, thus AMD treatment has been considered a major challenge in environmental protection. Heavy metal ions and sulfate ions must be removed from AMD, and acidity must be neutralized. In this study, a two-step approach was proposed to treat the simulated AMD by using H2O2 and Na2O2 to synthesize schwertmannite to remove heavy metal ions and sulfate ions from AMD and increase the water pH. A total of 0.2 mL H2O2 and 0.16 g Na2O2 are added in the two steps. In the first step, 100 mL simulated AMD was first treated by adding composite oxidants (0.2 mL H2O2 and 0.12 g Na2O2) to produce schwertmannite, which was then separated from the solution. In the second step, 0.04 g Na2O2 was added to the filtrate obtained in the first step to remove residual ions and neutralize acidity. The removal rates of TFe (total Fe), Mn2+, and SO42− reached 99.98%, 99.75%, and 31.62%, respectively, and the pH increased to 7.57. More excitingly, this method also worked very well for raw AMD, which was superior to the H2O2 method. The treatment mechanism was further discussed. Meanwhile, the obtained schwertmannite can be reused as heavy metal ion absorbents. This research has innovative aspects in two areas: firstly, synthesizing schwertmannite without decreasing the water's pH value; secondly, utilizing the contaminants in AMD, such as Fe ions and SO42− as raw materials to form schwertmannite, thus allowing for resourceful usage of AMD. The aim is to contribute to the development and exploration of sustainable AMD management. This method provides a new solution for AMD treatment and simultaneous resource recovery.
- Subjects
ACID mine drainage; OXIDIZING agents; METAL ions; WASTE recycling; SUSTAINABLE development
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 8, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06522-2