Effects of Biochar and Marble mud on Mine Waste Properties to Reclaim Tailing Ponds

Journal ar
Land Degradation and Development
  • Volumen: 27
  • Número: 4
  • Fecha: 01 May 2016
  • Páginas: 1227-1235
  • ISSN: 1099145X 10853278
  • Source Type: Journal
  • DOI: 10.1002/ldr.2521
  • Document Type: Article
  • Publisher: John Wiley and Sons Ltd Southern Gate Chichester, West Sussex PO19 8SQ
© 2016 John Wiley & Sons, Ltd. The effects of biochar addition in improving soil physical properties are not clearly understood in mining tailings. The objective of this study was to determine the effects of three different types of biochars, in addition to marble mud (MM) and their mixtures, on the structural stability and water retention of mine wastes in Cartagena, Spain. Biochars were produced at 500°C from pig manure (PM), cotton (Gossipium hirsutum L.) crop residues (CR) and municipal solid waste (MSW). Biochars were added to the mine waste (MW) along with MM and a control (no amendments added). These mixtures were incubated in cores for 90days (25°C). PM and CR mixed with MM decreased soil bulk density (from 0·98gcm-3 to 0·89 and 0·84gcm-3, respectively). Amendments had no significant effect on total porosity whereas they increased gas diffusion by 100%, except for MSW. MM improved the plant available water from 0·59 to 2·56cm as its combination with biochars, extremely relevant in water scarce climates. The micropores were likely replaced by mesopores when application of PM, CR, MM, and biochars+MM and they improved water retention. Total carbon (TC) and total nitrogen (TN) increased by using biochars and MM and no significant effects were assessed on aggregates. In general, MM mixed with PM and CR derived biochar improved the structural stability and exhibited a strong impact in reclaiming physical quality on mine tailings.

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