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Related Experiment Videos

Biosolids decomposition after surface applications in west Texas.

W F Jaynes1, R E Zartman, R E Sosebee

  • 1Plant and Soil Science Department, Texas Tech University, Lubbock, TX 79409, USA. william.jaynes@ttu.edu

Journal of Environmental Quality
|October 11, 2003
PubMed
Summary
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Biosolids applied in semiarid climates lose organic matter and nutrients like nitrogen and phosphorus over time. Sparingly soluble phosphates can persist, potentially impacting water quality through runoff.

Area of Science:

  • Environmental Science
  • Soil Science
  • Agricultural Chemistry

Background:

  • Climate significantly influences the decomposition of surface-applied biosolids in semiarid regions.
  • Understanding the long-term fate of biosolids is crucial for sustainable land application and environmental protection.

Purpose of the Study:

  • To investigate the effects of long-term exposure (2-7 years) on the chemical composition of biosolids applied in a semiarid environment.
  • To quantify changes in organic matter, nutrients (N, P, S), and heavy metals (Cu, Cr, Pb, Hg, Zn) over time.

Main Methods:

  • Analysis of biosolids samples with varying exposure times (up to 82 months) in western Texas.
  • Measurement of total organic carbon, nitrogen, sulfur, and phosphorus.
  • Selective dissolution techniques to determine phosphorus speciation.

Related Experiment Videos

  • Chemical analysis of ash content and heavy metal concentrations.

    • Main Results:

    • Total organic carbon decreased significantly, while inorganic ash content increased with exposure time.
    • Total nitrogen and sulfur content decreased substantially.
    • Bicarbonate-available phosphorus declined, with shifts towards less soluble forms like tricalcium phosphate.
    • Copper and zinc showed evidence of leaching or runoff, while lead, chromium, and mercury remained stable.

    Conclusions:

    • Long-term exposure in semiarid climates leads to significant decomposition and nutrient loss from biosolids.
    • The persistence of sparingly soluble phosphates poses a potential risk for phosphorus release into runoff.
    • Differential mobility of heavy metals suggests specific management considerations for different elements.