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Nitrogen transformations during pig manure composting.

G F Huang1, Q T Wu, F B Li

  • 1College of Natural Resources and Environment, South China Agricultural University, Wushan, Guangzhou 510642. gfhuang@scau.edu.cn

Journal of Environmental Sciences (China)
|November 29, 2001
PubMed
Summary

Composting pig manure with sawdust and leaves accelerates maturity and enhances nutrient content. This eco-friendly waste management method improves compost quality for potential agricultural use.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Waste Management

Background:

  • Composting offers an environmentally friendly alternative for organic waste disposal, promoting waste minimization, stabilization, and utilization.
  • Investigating nutrient transformations during co-composting is crucial for optimizing the process and compost quality.

Purpose of the Study:

  • To investigate nitrogen transformations in co-composting of pig manure with sawdust and leaves.
  • To assess the impact of amendments on compost maturity and quality using seed germination index.

Main Methods:

  • Co-composting of pig manure with sawdust and leaves.
  • Analysis of total nitrogen, soluble ammonium-nitrogen (NH4-N), nitrate-nitrogen (NO3-N), and soluble organic-nitrogen.
  • Evaluation of compost maturity using the seed germination index (GI).

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Main Results:

  • Total nitrogen, soluble NO3-N, and soluble organic-N increased over 63 days.
  • Soluble NH4-N peaked at day 7 and then decreased.
  • Compost maturity was reached in 49 days (pig manure + sawdust) and 35 days (pig manure + sawdust + leaves).
  • Soluble NH4-N negatively correlated with GI, while NO3-N and organic-N positively correlated.

Conclusions:

  • Co-composting pig manure with sawdust and leaves enhances nitrogen content and accelerates compost maturity.
  • The addition of leaves significantly reduced the time required for compost maturation.
  • Optimized co-composting strategies can improve the quality of organic waste for sustainable management.