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Related Experiment Videos

Decrease in water-soluble 17beta-Estradiol and testosterone in composted poultry manure with time.

Heldur Hakk1, Patricia Millner, Gerald Larsen

  • 1USDA-ARS, Biosciences Research Laboratory, Fargo, ND 58105, USA. hakkh@fargo.ars.usda.gov

Journal of Environmental Quality
|April 22, 2005
PubMed
Summary

Composting chicken manure reduces endocrine disrupting compounds (EDCs) like 17beta-estradiol and testosterone. While composting significantly decreases hormone levels, they remain detectable, suggesting it

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Endocrinology

Background:

  • Animal waste contains hormones like 17beta-estradiol and testosterone, which are endocrine disrupting compounds (EDCs).
  • Land application of manure can introduce these EDCs into the environment.
  • Composting is a process that stabilizes organic matter.

Purpose of the Study:

  • To quantitatively assess the levels of water-soluble 17beta-estradiol and testosterone in composting chicken manure over time.
  • To evaluate the effectiveness of composting in reducing EDCs from animal waste.

Main Methods:

  • Chicken manure was composted in windrows with amendments (hay, straw, leaves, starter compost) and moisture adjusted to 60%.
  • Compost windrows were turned weekly, with monitoring of temperature, oxygen, and CO2.

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  • Hormone levels were quantified using commercial enzyme immunoassay kits.

    • Main Results:

    • Water-soluble 17beta-estradiol and testosterone levels decreased significantly during composting.
    • The decline followed first-order kinetics, with rate constants k = -0.010/d for 17beta-estradiol and k = -0.015/d for testosterone.
    • Both hormones were still measurable in compost at the end of the study; clay amendment did not significantly alter hormone decline.

    Conclusions:

    • Composting effectively reduces concentrations of 17beta-estradiol and testosterone in chicken manure.
    • Composting is a potentially environmentally friendly technology for managing EDCs from concentrated animal operations.
    • Composting reduces, but does not completely eliminate, these endocrine disrupting hormones.