Effects of the maturity of wood waste compost on the structural features of humic acids

Masami Fukushima, Kanako Yamamoto, Keishi Ootsuka, Takeshi Komai, Toshihiro Aramaki, Shigeru Ueda, Shigekazu Horiya

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


An analytical scheme for the separation of humic substances (HSs) and non-humic substances (non-HSs) was established to estimate the humification index (HI), which was defined as the ratio of HS carbon content to non-HS carbon content. The alkaline compost-extract contained a mixture of HSs and non-HSs, while acidification of the compost-extract resulted in precipitation of humic acid (HA). The acidified supernatant contained fulvic acid (FA) and non-HSs. In the present study, DAX-8 resin was used to separate FA and non-HSs. HI values, which were estimated to evaluate the maturity of wood waste compost, increased with composting duration. To determine the effects of compost maturity on HA structural features, correlations between HI and indicators of the degree of HA humification (atomic ratios, acidic functional group contents, spectroscopic parameters and molecular weight) were investigated. HI values were significantly related to the indicators of the extent of HA humification during composting.

Original languageEnglish
Pages (from-to)791-797
Number of pages7
JournalBioresource Technology
Issue number2
Publication statusPublished - 2009 Jan
Externally publishedYes


  • Composting
  • DAX-8 resin
  • Humic substances
  • Humification index
  • Wood waste

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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