AI Article Synopsis
- A new green method using biochar has been developed to control acid mine drainage by passivating pyrite, which is a major contributor to AMD.
- The biochar is produced through an efficient in-situ pyrolysis process utilizing smoldering applewood, optimizing factors like particle size, moisture content, and gas flow rate for better yield.
- The optimal conditions yield the best biochar, which enhances the formation of a protective layer (jarosite) around pyrite and reduces metal ion release, improving water quality.
Article Abstract
To control acid mine drainage (AMD) from the source, a new environmentally and green passivator (biochar) has been introduced to passivate pyrite. To reduce the difficulty of biochar preparation and cost, and improve its production scale, in-situ pyrolysis of applewood by smoldering to produce biochar. Here, particle size, moisture content and gas flow rate were selected to prepare biochar by smoldering through orthogonal combination, and the pyrite was passivated with different conditions and biochar concentrations (2 g/L, 3 g/L, 4 g/L). The results revealed that when the particle size is 200 mm×200 mm×20 mm, the water content is 20-30%, and the gas flow rate is 0.4 L/m, the biochar yield is the highest. Biochar promotes the formation of passivating layer (jarosite), inhibits the release of metal ions. Increasing biochar concentration can promote the formation of jarosite and enhance the passivation effect on pyrite.
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| http://dx.doi.org/10.1007/s00128-024-03956-0 | DOI Listing |
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