Co-compositing of pig manure with leaves

G. F. Huang, M. Fang, Q. T. Wu, L. X. Zhou, X. D. Liao, Jonathan W C WONG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

36 Citations (Scopus)


The increase in the market price of sawdust makes it a less attractive bulking agent for pig manure composting. Hence, it was the aim of this project to evaluate the feasibility of co-composting pig manure with leaves with special emphasis on its effects on compost maturity and quality. Two piles were prepared with one pile (Pile A) just constituted of pig manure and sawdust at a mixing ratio of 3:2 (w/w, fresh weight), while the other one (Pile B) with pig manure, sawdust and leaves at 3:1:1 ratio (w/w, fresh weight) to achieve a C/N ratio of 30. Each 8 m3 heap was turned and mixed every 3 days to provide sufficient aeration and the moisture content was kept at 60-70% (w/w) throughout the composting period. After 49 days of composting, dissolved organic carbon (DOC), soluble NH4-N, C/Nsolid and C/Naqueous of pile A decreased to <5%, 400 mg kg-1, 20 and 6, respectively, indicating a high degree of maturity, while pile B with leaves required only 35 days. Seed germination index (GI) of pile A increased to 66.5% at day 49, while pile B to 52.4% at day 35, which was higher than the phytotoxin-free level of 50% recommended for agricultural use. This demonstrated that the addition of leaves enhanced the humification process and shortened the time required for maturation and stabilization of pig manure composting. Therefore, it is recommended to co-compost pig manure with leaves to provide a means to reutilize this waste and in the same time to reduce the dependence on sawdust as a bulking agent.

Original languageEnglish
Pages (from-to)1203-1212
Number of pages10
JournalEnvironmental Technology (United Kingdom)
Issue number10
Publication statusPublished - 2001

Scopus Subject Areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

User-Defined Keywords

  • Composting
  • Leaves
  • Maturity
  • Pig manure
  • Sawdust


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