Nitrogen transformations during pig manure composting

Guo-feng Huang*, Qi-tang Wu, Fang-bai Li, J. W. C. Wong

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

14 Citations (Scopus)


Composting is now suggested as one of the environmentally and friendly alternative method for disposal of solid organic wastes, as it leads to minimization, stabilization, and utilization of organic waste. Transformations of nitrogen were investigated in co-composting of pig manure with different amendments, such as sawdust and leaves. Samples were analyzed for pH, total-N, soluble NO3-N and soluble organic-N. The total-N increased after 63 days of composting, as well as the soluble NO3-N and soluble organic-N. Soluble NH4-N increased significantly and showed peak values at day 7, thereafter decreased sharply and gradually to lower levels. Seed germination index (GI) showed that co-composting of pig manure with sawdust reached maturity after 49 days of composting, while co-composting of pig manure with sawdust and leaves required shorter time for 35 days. Soluble NH4-N was significantly negatively (P<0.05) , while soluble NO3-N and soluble organic-N were significantly positively (P<0.05) , correlated with seed germination index (GI). Addition of leaves in co-composting of pig manure with sawdust had no significant impacts on nitrogen transformations, but it was beneficial for maturity of pig manure compost.

Original languageEnglish
Pages (from-to)401-405
Number of pages5
JournalJournal of Environmental Sciences
Issue number4
Publication statusPublished - Oct 2001

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science(all)

User-Defined Keywords

  • Pig manure
  • Composting
  • Nitrogen
  • Transformation
  • Maturity


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