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Applications of Cr-rich composted tannery sludge in the soil decrease microbial biomass and select specific bacterial

Ademir Sergio Ferreira Araujo1, Arthur Prudêncio de Araujo Pereira2, Lucas William Mendes3

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Successive applications of chromium (Cr)-rich composted tannery sludge (CTS) can alter soil microbial communities. These applications selectively enrich specific microbial groups with unique functions, highlighting potential impacts on soil ecosystems.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Soil Science

Background:

  • Tannery sludge, a waste product, contains organic and inorganic compounds, notably chromium (Cr).
  • High Cr concentrations in tannery sludge can negatively impact soil microorganisms.
  • Composting tannery sludge can reduce Cr levels, but high concentrations may persist in composted tannery sludge (CTS).

Discussion:

  • This review examines the effects of repeated applications of Cr-rich CTS on soil microbial properties over the past decade.
  • Studies indicate that Cr-rich CTS application influences soil microbial community structure and function.
  • The research highlights the selective pressure exerted by Cr on soil microbes.

Key Insights:

  • Successive applications of Cr-rich CTS lead to the selection of specific soil microbial groups.
  • These selected microbial groups possess distinct functional potentials.
  • The findings suggest a significant impact on the soil microbiome's composition and activity.

Outlook:

  • Further research is warranted to understand the long-term effects of Cr-rich CTS on soil microbial diversity.
  • Investigating the influence on rare microbial communities is a key area for future study.
  • Exploring the functional implications of selected microbial groups in Cr-rich environments is crucial.